How to Plan a Builder Fixing List Before Plastering and Joinery Start

Planning a builder fixing list before plastering and joinery start is where projects are either protected or quietly set up to fail. Miss a few key checks at this stage and you can easily add £2,000 to £5,000 in avoidable rework through chasing cables, moving radiators, and repairing finished walls. Get it right and everything that follows, plastering, second fix carpentry, kitchens, tiling, runs smoothly, on time, and within budget.

A fixing list is simply a detailed record of everything that must be installed, adjusted, or agreed before walls and ceilings are closed up. In practice, it is far more than a list. It is a coordination tool between trades, a cost control checkpoint, and a final opportunity to fix mistakes while access is still easy.

This guide is based on how experienced UK builders actually run jobs on site. It covers what to include, how to structure your list, what it costs to correct mistakes, and how to align with building regulations and trade sequencing.

What a Builder Fixing List Actually Covers

A proper fixing list sits between first fix and plastering. First fix includes structural carpentry, electrics, plumbing pipework, and ventilation ducting. Once those are in place but before boarding and plaster, you walk the project and record everything that still needs to be done, altered, or verified.

This includes visible items like socket positions and door openings, but also hidden details such as insulation gaps and fire stopping. It is your last chance to inspect behind the walls.

On a typical UK renovation or extension, the fixing list will cover:

• Electrical first fix positions, including sockets, switches, lighting, data, alarms
• Plumbing pipe routes, radiator positions, wastes, fall gradients
• Carpentry, including noggins for future fixings, door lining positions, boxing layouts
• Ventilation including extractor duct routes and terminations
• Insulation completeness and airtightness details
• Structural elements that need packing, trimming, or correcting
• Window and door reveals and thresholds
• Any agreed changes since the original drawings

If it is buried behind plasterboard, it must be checked during this stage.

Why This Stage Is So Often Rushed and Why That Costs Money

Many homeowners underestimate how quickly trades move once first fix is complete. Plasterers may be booked weeks in advance. Builders feel pressure to keep momentum. As a result, the fixing stage is sometimes treated as a quick snag list rather than a structured review.

This is where costs creep in.

Cutting into fresh plaster to move a socket might cost £80 to £150 per point once you factor labour, making good, and redecorating. Moving a radiator after floors are down can run £250 to £500. Adjusting a door opening after plastering can involve re boarding, new architrave, and repainting, often £300 plus per opening.

In more complex cases, the costs escalate further. For example, if kitchen appliance positions change after plastering, electricians may need to reroute multiple circuits and issue updated certification. That can easily run into £400 to £800. If tiled bathrooms are affected, you are then paying for tile removal, waterproofing repairs, and re tiling.

By contrast, making these adjustments before plastering is often just labour time. A few hours for a carpenter or electrician might cost £150 to £300 and solve multiple issues in one visit.

How to Structure an Effective Fixing List

A fixing list should not be a vague collection of notes on your phone. It needs to be structured so each trade can act on it without confusion.

Break it down by room, then by trade. Include a clear description, location, and outcome required. Avoid general comments like “adjust lighting”. Instead write “move kitchen island pendant 150mm towards hob to align with centreline”.

A practical format looks like this:

Room	Trade	Item	Action Required	Status
Kitchen	Electrical	Socket by island	Raise to 1050mm from FFL and align with unit edge	Open
Bathroom	Plumbing	Shower valve	Centre with tray and confirm depth for tile finish	Open
Hallway	Carpentry	Door lining	Shift 10mm to allow for floor build up	Complete

This level of clarity prevents misinterpretation and reduces back and forth between trades. It also creates a record that protects both homeowner and builder if disagreements arise later.

Key Checks Before Plastering Starts

Before any plasterboard is fixed or wet plaster applied, work through a systematic checklist. This is the stage where experienced site managers slow down and go room by room.

Electrical checks

Check every socket, switch, and lighting point against your furniture and kitchen layouts. Electricians should have cables running in safe zones and back boxes set to the correct depth to allow for plaster finish. If sockets are too shallow or deep, second fix becomes messy.

Also confirm allowances for specialist items. Kitchen designers will expect exact positions for appliances, island sockets, and under cabinet lighting. If these are wrong now, the kitchen fitter will either have to adapt units or delay installation.

Plumbing checks

All pipework should be pressure tested before being covered. Radiator centres should match window or wall layouts and allow for skirting and flooring build up. In bathrooms, valve depths must allow for tile thickness plus adhesive.

A common site issue is wastes with insufficient fall. This might not show until fixtures are in use, but correcting it later often involves opening floors or walls.

Carpentry preparation

Noggins are critical. These are horizontal timber supports installed between studs for fixing heavy items later. Think kitchen wall units, TVs, mirrors, and basins. If they are missing, you will be limited to plasterboard fixings, which are not always suitable.

Door linings must be set at the correct height to account for finished floors. If this is missed, doors may need trimming or re fitting, which affects appearance and cost.

Insulation and airtightness

Insulation must be continuous with no gaps. Pay close attention to corners, junctions, and around windows. Small gaps here reduce thermal performance and can create cold bridges and condensation risks.

Airtightness details are increasingly important under Part L. Taping membranes, sealing penetrations, and avoiding unnecessary holes all contribute to energy efficiency.

• All electrical back boxes fixed solidly and set to correct depth for plaster finish
• Cables protected in safe zones in line with Part P and guidance from NICEIC
• Pipework pressure tested and clipped securely
• Radiator positions confirmed against furniture layouts
• Extractor fans ducted to external air, not just into voids, in line with Approved Document F, see UK ventilation guidance
• Insulation fully installed with no gaps, especially in corners and around openings
• Noggins installed where heavy items will be fixed later, such as kitchen cabinets, TVs, or basins
• Door linings plumb and fixed at correct height for finished floor levels
• Fire stopping completed where required, particularly in loft conversions and between floors

If you skip even one of these, it usually shows up after plastering, when it is harder and more expensive to rectify.

Builder Fixing List Walkthrough Checklist

Use this on site as a practical step by step checklist.

• Walk each room with drawings, mark all required changes clearly
• Confirm electrical positions against furniture and kitchen plans
• Check plumbing routes, falls, and pressure tests
• Inspect carpentry including noggins, door linings, and boxing
• Verify insulation coverage and airtightness details
• Confirm ventilation routes and external terminations
• Review any structural adjustments or packing required
• Update fixing list with clear actions and assign to each trade
• Agree timing for completion and re inspection
• Ensure Building Control inspection is booked if required
• Sign off each room before plastering is scheduled

Coordinating Trades at Fixing Stage

This is not just about spotting issues. It is about timing. Electricians, plumbers, and carpenters often need to revisit areas once others have made adjustments. Poor coordination leads to clashes and delays.

Managing overlapping work areas

In tight spaces like bathrooms and utility rooms, multiple trades compete for the same walls and service voids. If a plumber sets pipework before an electrician routes cables, one may have to redo work. Sequencing matters. Agree who goes first and ensure sign off before the next trade starts.

Kitchen and joinery dependencies

Kitchens are heavily dependent on accuracy at fixing stage. Kitchen designers provide service drawings that show exact positions for sockets, feeds, and waste pipes. If these are even 50mm out, units may not fit as intended.

Second fix carpenters also rely on correct groundwork. Skirting lines, architraves, and built in joinery all depend on straight walls, correct openings, and consistent levels.

Tiling and bathroom coordination

Tilers need accurate plumbing depths and square surfaces. A shower valve set too deep or too shallow can force rework. Tile set out is also affected by window and niche positions, which must be confirmed early.

For a deeper look at sequencing trades properly, this guide is worth reading: How to Plan a Trades Booking Schedule for Your Renovation Avoiding Clashes Lead Times and Downtime.

On site, a practical approach is to schedule a joint walk through with key trades before plastering is booked. This avoids a situation where one trade signs off an area that another later disputes.

Expect this stage to take one to three days on an average house renovation. Larger extensions or full refurbishments may need a week to resolve everything properly.

Tools and Documents to Bring to a Fixing Stage Walkthrough

Turning up prepared makes this stage far more efficient.

• Printed drawings and mark ups, including electrical and kitchen layouts
• Tape measure and laser level for checking heights and alignment
• Marker pens or chalk for marking adjustments directly on walls
• Camera or phone for recording issues and progress
• Spirit level for quick checks on door linings and framing
• Notebook or digital fixing list for logging actions clearly
• Manufacturer specs for key items such as showers or appliances

Linking Your Fixing List to Your Scope and Programme

Your fixing list should not exist in isolation. It ties directly into your original scope of works and programme.

If you defined your job correctly from the start, your fixing list is where you check that reality matches the plan. Any changes from drawings or specifications should be recorded and costed at this point.

If you have not already set up a clear scope, refer to: How to Prepare a Scope of Works for UK Home Renovations So Every Trade Quotes the Same Job and Your Timeline Stays on Track.

Likewise, your programme of works should reflect this checkpoint. Plastering should never be booked until the fixing list is signed off. This article explains how to structure a realistic programme: How to Create a UK Home Renovation Programme of Works That Tradespeople Actually Follow.

Typical Costs of Fixing Stage Adjustments

Below is a realistic guide to common adjustments made during the fixing stage and their typical UK costs before plastering.

Task	Typical Cost	Notes
Move electrical socket	£40 to £90 per point	More if cabling needs extending
Adjust pipework	£80 to £200	Depends on accessibility and system type
Add noggins	£50 to £150 per area	Essential for wall mounted fixtures
Reposition door lining	£100 to £250	Assumes no structural change
Correct insulation gaps	£50 to £200	Depends on scale

Typical labour rates in the UK

Day rates vary depending on location and experience.

• Electrician, £250 to £400 per day, London often £350 plus
• Plumber, £200 to £350 per day, higher for heating specialists
• Carpenter, £180 to £300 per day depending on skill level

In London and the South East, expect rates around 20 to 40 percent higher than other regions.

Before plaster vs after plaster cost scenarios

Simple example. Moving three sockets and one radiator before plastering might cost £300 to £500 total. Doing the same work after plastering can rise to £900 to £1,500 once making good and decorating are included.

Bathroom example. Adjusting pipework and valve depths before tiling may cost £150 to £300. After tiling, the same issue can exceed £1,000 once tiles and waterproofing are affected.

Fix Before Plaster vs Fix After Plaster

Factor	Fix Before Plaster	Fix After Plaster
Cost	Low, mostly labour	High, includes making good and redecorating
Time	Quick adjustments	Slower due to rework and drying times
Disruption	Minimal	High, dust and damage to finishes
Risk	Low	Higher risk of visible defects

Common Mistakes to Avoid

This is where many projects lose time and money. The same issues come up repeatedly.

• Relying on memory instead of a written fixing list. This often leads to missed items, such as forgotten data points or lighting changes, which only appear once rooms are finished
• Not checking finished floor levels before setting socket and door heights. This can result in sockets sitting too low behind skirting or doors needing trimming that looks uneven
• Forgetting future fixtures such as TVs or shelving, leading to missing noggins. Homeowners then rely on plasterboard fixings that may fail over time
• Allowing plastering to start with unresolved items. This creates a domino effect where later trades have to undo completed work
• Poor communication between trades, especially electrical and kitchen installers. This can delay kitchen fitting by days or weeks
• Ignoring ventilation requirements, which can lead to failed building control inspections and costly remedial work

Working With Building Control and Regulations

At this stage, compliance matters as much as finish. Building Control inspections are often required before walls and ceilings are closed.

Part P, electrical safety

Electrical work must comply with Part P. This means installation by a competent person and certification on completion. NICEIC is one of the main Competent Person Schemes in the UK. Registered electricians can self certify their work, removing the need for separate inspection in many cases.

Part L, energy performance

Inspectors will look at insulation thickness, continuity, and airtightness. Missing insulation or poor detailing may require opening up works before sign off.

Part F, ventilation

Ventilation systems must be correctly installed and ducted to external الهواء. Internal termination into loft spaces is not acceptable. Airflow rates may also be tested.

Part B, fire safety

Fire stopping, escape routes, and structural protection are assessed. In loft conversions, this includes fire doors and protected stair enclosures.

Building Control inspections are typically required at key stages, including after first fix and before plastering. If work is covered before inspection, you may be required to expose it again.

Competent Person Schemes such as NICEIC for electrics and Gas Safe for gas work allow certified trades to self sign off specific elements. However, overall project compliance still sits with Building Control.

For safety and site practice guidance, see HSE construction guidance, which outlines responsibilities for safe installation and working conditions.

How Trade Overlap Impacts the Fixing Stage

At fixing stage, trades often overlap in tight spaces. Electricians, plumbers, and carpenters may all need the same wall or ceiling void.

If this is not managed properly, you get rework, such as cables being moved after pipe runs or vice versa.

This guide explains how to manage overlap without creating delays: How to Plan Trade Overlap on a Home Renovation Without Causing Delays or Rework.

A practical rule on site is simple. One trade completes and signs off an area before the next begins. This avoids blame shifting and ensures accountability.

Realistic Timeframes for the Fixing Stage

Time required depends on project size and complexity.

• Small renovation or single room, one to two days
• Medium project such as a kitchen extension, two to four days
• Full house renovation, four to ten days

Delays at this stage are often caused by late design decisions, missing drawings, unavailable trades, or failed inspections. For example, if kitchen plans are not finalised, electricians cannot complete positioning. If Building Control cannot attend promptly, work may pause.

To avoid delays, confirm all layouts early, book inspections in advance, and ensure all trades are aware of fixing list deadlines.

How Poor Fixing Stage Planning Affects Later Stages

If this stage is rushed, the impact shows later. Kitchen installation may be delayed due to misaligned services. Flooring may need cutting around poorly positioned pipes. Decorating may suffer from patched walls and uneven finishes.

Second fix carpenters rely on accuracy. If door openings are out or walls are uneven, finished joinery will highlight those issues. Taking time now prevents visible defects later.

FAQ

Do I need a fixing list if I have detailed drawings?

Yes. Drawings show intent, but site conditions vary. Walls move slightly, floor levels change, and client decisions evolve. The fixing list captures real world adjustments that drawings cannot predict.

Who should create the fixing list, the builder or homeowner?

Usually a joint effort. The builder leads on technical items while the homeowner focuses on layout and usability, such as socket positions and lighting. A good builder will guide you through it, but you should be involved.

Can plastering start in some rooms while fixing continues elsewhere?

It can, but only if those areas are fully signed off. Partial sign offs require careful control. Otherwise you risk trades moving between finished and unfinished areas, causing damage.

What happens if something is missed and discovered after plastering?

It can still be corrected, but expect higher costs and disruption. Walls may need cutting, patching, and repainting. In some cases, such as structural or ventilation issues, building control may require full remediation.

Do I need Building Control sign off before plastering starts?

In most UK projects, yes, at least for areas covered by regulations such as structure, insulation, and first fix services. Inspectors often require a visit before walls and ceilings are closed. If you proceed without inspection, you may be required to open up completed work. Always confirm with your local authority or approved inspector and book inspections in advance.

Final Thoughts

The fixing list stage is where a professional job separates itself from a rushed one. It is your last clear view into the structure before everything is sealed and finished. Taking the time to plan, check, and document properly avoids expensive surprises later and gives every trade a clean run at their work.

If you are starting a renovation and want reliable trades who understand proper sequencing and quality control, the simplest next step is to post a job on BookaBuilderUK and get free quotes from vetted local professionals.