Architect Brief Checklist

An architect brief checklist is the foundation of any successful building project. Whether you are planning a rear extension, loft conversion or full renovation, the quality of your brief will directly affect design quality, build costs and project timelines. A vague or incomplete brief almost always results in delays, redesign fees and disputes later on site.

From a trades perspective, you can spot a project with a weak brief straight away. Drawings lack detail, key decisions have not been made, and assumptions creep in. That leads to variations, unexpected costs and friction between homeowner, architect and builder. A proper brief prevents most of that.

This article breaks down exactly what should go into your architect brief, how detailed it needs to be, realistic UK costs, and the common mistakes that cause projects to stall. It is written from practical experience working alongside architects, engineers and contractors across residential jobs in the UK.

What Is an Architect Brief and Why It Matters

An architect brief is a structured document that sets out your requirements, constraints and expectations for a project. It acts as the reference point from concept design through to construction.

A good brief does three things:

• Gives the architect clear direction, reducing guesswork
• Helps control project costs by defining scope early
• Aligns all parties before design work begins

Without it, architects must interpret your needs. That usually leads to multiple revisions. Most UK architects charge between £75 and £150 per hour for additional design work, so unclear instructions can quickly add £1,000 to £3,000 in avoidable fees.

The brief should also establish which requirements are essential and which are desirable. If the budget becomes tight, the architect can then protect the essential items while testing less expensive alternatives for the desirable ones.

If you have not yet clarified your own requirements, it is worth reviewing Home Renovation Client Brief Checklist Before You Contact Builders before engaging design professionals.

Architect Brief Checklist for UK Homeowners

Below is a practical checklist used by experienced architects and contractors. The more detail you can provide in each section, the smoother your project will run.

1. Project Overview

• Type of project, such as single storey extension, loft conversion or full refurbishment
• Property type, period, and approximate age
• Location and whether it is in a conservation area or listed
• Primary goal, such as more space, better layout or increased value

Include basic measurements and photos if possible. Even rough sketches help communicate intent.

Explain what is wrong with the existing property rather than only describing the proposed solution. A dark kitchen, poor garden connection, limited storage or an inaccessible bathroom may have several possible design answers. Giving the architect the underlying problem allows them to test options you may not have considered.

Record who occupies the property, how long you expect to remain there and whether work will happen while you are living on site. Phasing can become a major design consideration if the kitchen, bathroom or heating must remain usable during construction.

2. Your Budget Range

This is where many briefs fall short. If you do not specify a budget, the architect has nothing to design around.

Typical UK build costs as a guide:

• Single storey extension, £2,000 to £3,500 per m2
• Double storey extension, £2,200 to £3,800 per m2
• Loft conversion, £40,000 to £75,000 depending on complexity
• Full renovation, £800 to £1,500 per m2

These figures are broad starting points rather than quotations. The lower renovation range is more realistic for light refurbishment. A substantial renovation involving structural alterations, new services, insulation and good quality finishes can cost £1,500 to £3,000 per m2 or more.

Costs are generally highest in London and parts of the South East, where labour, parking, waste removal and contractor overheads can add 15 to 30 percent compared with many areas of the Midlands, Wales, Northern England and Northern Ireland. Remote parts of Scotland, islands and rural districts can also be expensive because labour and materials must travel further.

Be clear whether your budget includes VAT, design fees, structural engineering, and contingency. A sensible contingency is 10 to 15 percent.

Most domestic building work and professional services are subject to VAT at the standard rate where the supplier is VAT registered. Some work to qualifying new homes, conversions and certain empty properties may receive different treatment, but homeowners should obtain project specific tax advice rather than assuming a reduced rate applies.

Separate the construction budget from the total project budget. A £150,000 total budget might need to allow £15,000 to £25,000 for professional fees, surveys, applications and statutory charges, plus £15,000 to £22,500 contingency. That could leave approximately £102,500 to £120,000 for the building contract and client supplied items.

Tell the architect whether you have a firm spending limit or could release extra funds for a clearly defined benefit. This stops an aspirational design being developed beyond what you can finance.

3. Design Preferences

• Modern, traditional or mixed style
• Examples of homes or finishes you like
• Preferred materials, such as brick, render, timber cladding
• Interior layout priorities

Providing reference images reduces redesign stages. Most architects expect at least a mood board level of input.

Also identify what you dislike. A photograph labelled with a short explanation is more useful than a large folder of unedited images. State whether your priority is appearance, durability, low maintenance, local character or the lowest practical installation cost.

Materials should be considered in relation to their setting. Some local planning authorities expect brick, stone, roof pitch and window proportions to respond to nearby buildings. Exposed coastal sites, flood risk areas and heavily shaded elevations may require finishes with better resistance to moisture, salt or staining.

4. Functional Requirements

This is about how the space will be used day to day.

• Number and size of rooms
• Open plan versus separate spaces
• Storage requirements
• Access and circulation
• Future needs such as growing family or working from home

Be specific. For example, instead of saying large kitchen, define island size, appliance layout and seating capacity.

List major furniture and appliances with approximate dimensions. This might include an American style fridge, range cooker, piano, large dining table, freestanding bath or fitted wardrobes. A room can meet a stated floor area and still fail in practice if doors, circulation routes and furniture compete for the same space.

Discuss noise, privacy and natural light. A home office beside a busy family kitchen may be unsuitable for calls. A rooflight can improve daylight but may also create summer overheating unless its size, orientation, glazing and shading are considered together.

5. Site and Access Constraints

Site access has a direct effect on design, build method and price. Your brief should identify anything that could restrict deliveries, scaffolding, excavation or waste removal.

• Width and height of side passages, gateways and shared drives
• Parking restrictions, controlled zones and permit requirements
• Whether skips, cranes or concrete pumps can stand near the property
• Steps, steep slopes and changes in ground level
• Shared access with neighbours or rights of way
• Overhead cables, trees, drains and inspection chambers
• Working hour restrictions imposed by a lease or local authority

A terraced property with no rear access may require every load to pass through the house. That increases labour, protection and cleaning costs. A small extension that looks straightforward on a drawing can therefore cost more than a larger project with open access.

Ask the architect to record constraints during the measured survey and show relevant items on the existing site plan. Builders can then make realistic allowances at tender stage instead of discovering access problems after appointment.

6. Surveys and Existing Information

A measured building survey normally provides the base information for design drawings. The required level of survey depends on the property and proposed work.

• Measured survey of plans, elevations and relevant sections
• Topographical survey where levels, boundaries or drainage falls matter
• Drainage survey if building near or over existing sewers
• Structural survey where cracking, movement or major alterations are involved
• Asbestos refurbishment survey before intrusive work to older properties
• Tree survey where protected or influential trees are nearby
• Ecology assessment where bats, nesting birds or protected habitats may be affected

Confirm whether survey fees are included in the architect’s quotation. Some practices measure buildings themselves, while others appoint specialist surveyors. Laser scans can be useful for irregular or historic buildings but do not remove the need to check concealed construction on site.

The architect should identify assumptions where parts of the building cannot be inspected. Floor build ups, foundation depths, hidden steelwork and drainage routes may require opening up or trial holes before technical design is completed.

7. Planning Constraints

Your architect needs to know whether planning permission is required or if permitted development rights apply. You can check general guidance via the UK Government planning portal.

External reference: https://www.planningportal.co.uk/permission

The Planning Portal mainly provides guidance and application services for England and Wales. Planning is devolved, so the rules, terminology and application processes differ across the UK.

• In England, some domestic work may be permitted development, subject to national limits, conditions and any local restrictions
• In Wales, permitted development rules are set by the Welsh planning system and should not be assumed to match England
• In Scotland, householder development rights and applications are governed by Scottish planning legislation and handled by the relevant planning authority
• In Northern Ireland, planning applications are handled by local councils under the Northern Irish planning system

Include:

• Any previous planning applications on the property
• Neighbour considerations
• Known restrictions such as conservation area status

Also check for listed building status, Article 4 directions in England, planning conditions attached to earlier approvals and restrictions affecting newer estates. Flats, maisonettes and listed buildings generally have different permitted development considerations from ordinary houses.

Planning determination periods vary by nation and application type. In England and Wales, a straightforward householder application is commonly targeted within 8 weeks after validation, while major applications usually have longer targets. Scotland and Northern Ireland use their own categories and performance periods. Complex proposals, missing information, committee dates, statutory consultations and agreed extensions of time can all lengthen the process.

Validation is not the same as approval. The determination clock generally starts once the authority accepts that the correct forms, drawings, ownership certificates and fee have been supplied. Allow time before submission for design development and after approval for any conditions that must be discharged.

8. Building Regulations Strategy

Building regulations approval is separate from planning. Your architect will need to know how you intend to proceed.

In England, applications to building control can commonly be made through a building control approval application with full plans or, for eligible work, a building notice. Wales retains its own building control legislation and procedures, which include full plans and building notice routes for suitable projects. These options are not available for every building or every type of work.

For a clear explanation, see Building Notice vs Full Plans Which Building Control Route Is Right for Your Renovation.

Most substantial projects benefit from full plans as drawings are checked in advance, reducing on site risk.

Scotland operates a building warrant system. A warrant normally needs to be granted before relevant work starts, and the English building notice route should not be assumed to apply. Northern Ireland has its own Building Regulations and council building control procedures. Full plans are required in various circumstances, while building notice procedures are limited to work that qualifies under Northern Irish rules.

The correct route depends on the nation, project type, use of the building and the appointed building control body. Higher risk buildings and certain work near public sewers can be subject to additional restrictions. Ask the architect to state who will prepare the technical information, submit the application, respond to comments and attend inspections.

Approval of drawings does not replace site inspections. The builder must notify building control at the required stages, which can include commencement, excavation, foundations, drainage, structural work, insulation and completion. Missing inspections can make final certification difficult.

9. Structural Considerations

Structural changes affect cost and complexity.

• Load bearing wall removals
• Steel beams requirements
• Foundation type if extending

A structural engineer typically charges £500 to £1,500 for calculations depending on scope.

More involved projects can cost £1,500 to £4,000 or more for engineering design, particularly where several steel frames, retaining walls, complex roof alterations or difficult ground conditions are involved. Trial pits may be needed to establish the depth and condition of existing foundations.

Your brief should say whether the architect will coordinate the engineer’s design and incorporate it into drawings. An engineer may size a beam, but the architectural details still need to show ceiling zones, fire protection, bearings, junctions and the effect on doors, services and finishes.

If you are unsure how to sequence appointments, see Who to Appoint First for a Home Renovation Architect Builder or Structural Engineer.

10. Services and Utilities

• Heating system changes
• Electrical upgrades
• Water pressure or drainage concerns

In England and Wales, domestic electrical work must meet the applicable requirements of Part P. Scotland and Northern Ireland operate under their own building standards and building regulations. Competent electrical contractors should provide the relevant inspection, testing and certification for the work undertaken.

Installers may be registered with schemes such as NICEIC.

External reference: https://www.niceic.com

Tell the architect where the boiler, hot water cylinder, consumer unit, incoming water supply and meters are located. Moving these can be expensive. Confirm whether the existing electrical supply, boiler output and water pressure can support the proposed rooms and appliances.

Drainage routes should be considered before fixing the plan. A new kitchen or bathroom placed far from suitable soil and waste connections may require raised floors, boxed pipework or pumped drainage. Early coordination can avoid awkward details later.

11. Sustainability and Energy Performance

Set clear environmental priorities rather than asking for a generally sustainable design. Requirements might include improved insulation, reduced air leakage, lower energy use, responsibly sourced materials or protection against overheating.

• Target energy performance or desired improvement to the Energy Performance Certificate rating
• Preferred heating system, including heat pump feasibility
• Solar panels, battery storage or electric vehicle charging
• Insulation strategy for walls, roofs and floors
• Water efficient fittings and rainwater use
• Retention and reuse of existing materials
• Whole life durability and maintenance expectations

Existing homes require a balanced approach. Adding insulation without considering ventilation, moisture movement and thermal bridges can create condensation or mould. Traditional solid wall buildings often need materials and details suited to their construction.

Ask the architect whether an energy assessor or building services designer is needed. Building regulations set minimum standards, but achieving lower running costs or a specific environmental target may require design work beyond basic compliance.

12. Accessibility and Future Use

Accessibility should be discussed even if no household member currently has reduced mobility. A level entrance, wider doorway or ground floor shower can make a home easier to use after injury, during later life or when relatives visit.

• Step free access where site levels allow
• Suitable door widths and turning space
• Accessible toilet or shower provision
• Locations for future grab rails or a stair lift
• Good lighting and visual contrast
• Controls, sockets and handles at practical heights

Requirements differ between new dwellings, extensions and alterations, and they also vary across the four UK nations. Your architect should explain which statutory accessibility standards apply and which improvements are voluntary client requirements.

If a household member has a specific disability, record their practical needs rather than relying on generic labels. An occupational therapist can provide useful input where the design involves specialist bathing, lifting equipment or wheelchair transfer space.

13. Timeline Expectations

Set a realistic timeframe. A typical UK timeline:

• Initial design and planning drawings, 4 to 10 weeks
• Planning approval, 8 to 10 weeks
• Building regulations drawings, 3 to 6 weeks
• Tender and builder selection, 2 to 4 weeks

Rushed programmes often lead to mistakes in design or pricing.

These stages do not always happen consecutively, and the programme depends on decisions, surveys and approvals. A modest extension may take 4 to 8 weeks for measured survey, briefing and concept design, followed by several weeks for planning drawings and client approval. Technical design can take 4 to 10 weeks where structural calculations and specialist input are needed.

Builder selection often takes 4 to 8 weeks if contractors are given enough time to inspect the property, ask questions and obtain subcontractor prices. Good builders may be booked 3 to 9 months ahead. In busy parts of London and the South East, or in rural areas with a small contractor pool, the wait can be longer.

A realistic example for an extension requiring planning permission might be:

1. Brief, appointment and measured survey, 2 to 4 weeks
2. Concept options and client decisions, 3 to 6 weeks
3. Planning preparation, submission and validation, 2 to 4 weeks
4. Planning determination, commonly around 8 weeks for a straightforward householder application in England or Wales, but potentially longer
5. Technical design, engineering and building control application, 6 to 12 weeks
6. Tendering, clarification and contract appointment, 4 to 8 weeks
7. Lead in before construction, 4 to 16 weeks depending on contractor availability and materials

Planning conditions, party wall procedures, freeholder consent, building warrants in Scotland, drainage agreements and ecology licences can delay a start. Bespoke glazing, roof trusses, heat pumps and electrical equipment may also have significant lead times.

14. Documentation and Paperwork

Your architect will need access to key documentation.

• Title plans
• Existing drawings if available
• Survey information
• Party wall considerations

For a wider overview, review Home Renovation Paperwork Checklist Before Builders Start.

Provide copies of planning decisions, building control certificates, guarantees, drainage records, lease documents and any restrictions in the title. Previous drawings should not automatically be treated as accurate. Alterations may have been made since they were prepared.

Party wall legislation applies in England and Wales, but Scotland and Northern Ireland have different legal arrangements for shared structures and boundaries. Where the Party Wall etc. Act 1996 applies, allow enough time for notices and possible awards before work starts.

15. Architect Deliverables and Exclusions

The brief should list exactly what the architect will issue at each stage. Planning drawings alone are rarely detailed enough for accurate construction pricing.

• Existing and proposed plans, sections and elevations
• Site and location plans
• Planning statement or design statement where required
• Building regulations information
• Construction details and schedules
• Door, window, finish and sanitaryware schedules where included
• Tender documents and responses to contractor queries
• Site inspection reports and contract administration records
• Digital file formats and printed copies

Ask for exclusions to be stated clearly. Common exclusions include structural engineering, quantity surveying, party wall services, ecology, arboriculture, energy calculations, interior design, kitchen design, drainage surveys, planning fees and building control charges.

Also confirm whether site visits are included and what they cover. Occasional inspections do not amount to continuous supervision. The architect cannot guarantee every item of workmanship unless a much wider inspection service has been expressly agreed.

16. Procurement and Builder Selection

Explain how you want the work priced and managed. Your procurement preference affects the level of design information required before builders quote.

• Competitive tender to several builders
• Negotiated price with a preferred contractor
• Traditional contract based on completed design information
• Contractor led design for selected elements
• Direct appointment of separate trades by the homeowner

A competitive tender can test the market, but it only works if each builder prices the same drawings, specification and contract conditions. A negotiated route can save time where a trusted builder is involved early, although costs still need to be checked against a clear scope.

Managing separate trades may appear cheaper but transfers programming, coordination and health and safety responsibilities to the homeowner. Discuss the implications with the architect before choosing this route.

17. Decision Making Responsibilities

Name the person authorised to approve design changes, costs and programme decisions. Where two or more homeowners are involved, conflicting instructions can stop progress and generate redesign fees.

Create a simple responsibility schedule covering:

• Who approves layouts and external appearance
• Who controls the budget
• Who selects kitchens, bathrooms and finishes
• Who communicates with the builder
• Who submits applications and pays statutory fees
• Who signs the building contract and certificates

Set deadlines for major choices. Windows, bricks, roof finishes, heating equipment and kitchen layouts may need approval well before construction reaches that stage.

18. Specification Quality

Drawings show size and position, while the specification describes quality, products and workmanship. Both are needed for dependable pricing.

A useful specification should define insulation, roofing, windows, doors, ironmongery, heating, electrical provision, sanitaryware, floor finishes, decoration and external works. Where exact products have not been selected, include a realistic supply allowance and a required performance standard.

A quote stating one bathroom suite included is too vague. A clearer allowance might identify a £3,500 supply budget, the number of fittings, the expected tile area and whether taps, screens, mirrors and accessories are included. This helps homeowners compare tenders fairly.

19. Recording Changes to the Brief

The brief will develop, but every change should be recorded. Keep one dated change log rather than relying on text messages, site conversations or memory.

Record	Details to Include
Change number	A unique reference for tracking
Date and requester	When the change was raised and by whom
Description	What is being added, removed or revised
Reason	Budget, planning, design preference or site condition
Impact	Fee, construction cost, programme and approval consequences
Status	Proposed, approved, rejected or superseded

Ask the architect to confirm the effect of a change before authorising further work. After planning approval, even a modest change to windows, roof form or external materials may require an amendment or new application. During construction, changes should be instructed through the agreed contract procedure and priced before work proceeds wherever possible.

Cost Breakdown for Architectural Services in the UK

Architect fees vary depending on experience, location and complexity. London and the South East sit at the higher end.

Service Stage	Typical Cost
Initial consultation	Free to £300
Concept design	£1,000 to £3,000
Planning drawings	£2,000 to £5,000
Building regulations drawings	£2,000 to £4,000
Full service fee percentage	7 to 15 percent of build cost

For a £100,000 extension, a full architectural service might cost £7,000 to £15,000. Partial services can reduce this but require more client involvement.

Fees at the lower end may cover a straightforward property and limited drawing package. A complex listed building, constrained urban site or bespoke renovation can require far more design, consultation and coordination.

Regional differences are significant. A residential architect in London may charge £100 to £180 per hour, while rates of £70 to £130 per hour are more common in many other regions. Experienced directors and specialist conservation architects can charge more.

Clarify whether the quotation is fixed, hourly or percentage based. Check how many concept revisions are included and what triggers an additional fee. VAT may be added to fees where the practice is VAT registered.

Professional costs outside the architect’s fee may include:

• Measured survey, approximately £500 to £2,000 for a typical home
• Structural engineer, approximately £500 to £4,000 depending on complexity
• Planning application and building control fees, varying by nation and authority
• Party wall surveyors, often £1,000 to £2,500 per adjoining owner where a full award is required
• Drainage or CCTV survey, approximately £250 to £600
• Asbestos refurbishment survey, approximately £300 to £800 for many domestic projects
• Quantity surveyor or cost consultant, often £1,000 to £5,000 for residential input

Keep contingency separate from design development allowances. Contingency covers genuine unknowns, such as poor ground, hidden decay or undocumented drainage. It should not be used to disguise omitted kitchens, flooring or landscaping.

Checking That Your Architect Is Registered

In the UK, the title architect is protected by law. Someone offering architectural design services may describe themselves as an architectural designer or technician, but they must be registered with the Architects Registration Board to use the title architect in business or professional practice.

Search the official register at https://arb.org.uk. Check the person’s full name rather than relying only on a practice name, website biography or professional logo. The register confirms whether the individual is currently registered.

Ask who will actually lead and sign off your project. A practice may employ several designers, but the named architect should be identifiable. Registration does not replace checking experience, references, professional indemnity insurance, scope and fees.

What Can Go Wrong Without a Proper Architect Brief

Skipping detail in the brief stage usually costs more than doing it properly.

• Design revisions. Multiple redraws increase fees and delay approvals
• Planning refusal. Poorly considered designs often fail local authority guidance
• Budget overruns. Designs not aligned to budget lead to expensive value engineering later
• Construction delays. Missing details slow down builders on site
• Disputes. Ambiguity causes disagreements over scope and expectations

One common example is kitchen extensions designed without realistic appliance layouts. Once the builder is on site, clients realise layouts do not work. That can lead to structural changes and thousands in variations.

Another common problem is pricing from planning drawings. Builders must make assumptions about insulation, steel protection, drainage, finishes and electrical work. One contractor may include these items while another excludes them, making the cheaper quotation appear better than it really is.

Site constraints can create similar surprises. If the tender does not mention that spoil must be carried through the house, quotes may exclude the additional labour and protection. The eventual variation is not necessarily unreasonable, but it could have been avoided by better information.

How Detailed Should Your Brief Be

A good rule is that your architect should be able to sketch a rough layout without needing to ask basic questions. That does not mean you need technical knowledge, but you do need clarity on your priorities.

If you are unsure about specifics, state preferences rather than leaving gaps. For example:

• Prefer bifold or sliding doors across full rear wall
• Want underfloor heating if budget allows
• Considering future loft conversion

This gives your architect direction without locking you into decisions too early.

Rank requirements as essential, preferred or optional. An essential requirement might be a ground floor shower. A preferred item could be a utility room. An optional item might be bespoke glazing if the cost plan permits.

A useful brief is detailed about outcomes but allows the architect room to solve the design. Requiring a particular wall to be removed before structural and layout options have been tested can close off a better or less expensive solution.

Working Effectively With Your Architect

A strong brief is just the starting point. Communication matters throughout.

• Agree scope and fees in writing before work begins
• Set review points at each design stage
• Respond promptly to queries to avoid delays
• Keep all decisions documented

From site experience, projects that run well usually have clients who stay engaged and decisive.

Agree how communication will be handled. One shared email thread, decision register or project portal is easier to track than instructions spread across telephone calls and messaging applications.

Review drawings carefully. Check room dimensions, door swings, furniture, storage, sockets, radiators, ceiling levels and external ground levels. Do not assume an item is included because it was discussed verbally.

At each stage, ask for confirmation of the current estimated construction cost and remaining risks. A design can comply with the brief but still exceed the budget if costs have moved or the specification has developed.

FAQ

Do I need an architect for a small extension?

Not always, but it is usually worth it. For simple rear extensions under permitted development, a technician or experienced builder may produce drawings. However, an architect can improve layout, light and long term value. For anything structurally complex or in constrained sites, professional design input reduces costly mistakes.

Can I change my brief after the design starts?

Yes, but expect additional fees and delays. Most architects charge hourly or per stage. Changes after planning approval can be particularly expensive if revised applications are required. Getting the brief right early is far more cost effective.

Record each revision in a dated change log and ask for confirmation of its effect on fees, approvals, build cost and programme. Do not ask a builder to proceed with an unpriced verbal change unless urgent safety work is involved.

How long does it take to prepare a proper architect brief?

For most homeowners, one to two weeks of focused effort is realistic. That includes gathering inspiration, defining budget and documenting requirements. Rushed briefs often create months of delays later, so it is time well spent.

Should I include fixtures and finishes in my brief?

At least at a high level, yes. You do not need to select exact products, but you should indicate quality expectations. For example, basic specification versus high end finishes. This affects both design and cost planning.

Are planning permission and building regulations approval the same?

No. Planning considers matters such as appearance, scale, neighbouring amenity and local policy. Building regulations or building standards address issues including structure, fire safety, ventilation, energy performance and drainage. A project may require one, both or neither, depending on its location and scope.

Should the architect inspect construction work?

Only if site inspections or contract administration are included in the appointment. Planning and technical drawings do not automatically include regular site visits. Agree the number, purpose and reporting method for inspections before construction begins.

Final Thoughts

An architect brief checklist is not paperwork for the sake of it. It is one of the most effective ways to control cost, reduce risk and achieve a design that actually works for your lifestyle.

The more clarity you provide at the start, the fewer surprises you will face during planning and construction. From a builder’s perspective, well defined projects run faster, cost what they should, and produce better results.

If you are ready to move forward, the next step is finding the right professionals to bring your plans to life. You can post a job on BookaBuilderUK to get free quotes from vetted local tradespeople.