How Much Does It Cost to Replace a Patio Door in 2026? Sliding, French and Bifold Options Compared

If you have ever had a quote for new patio doors and wondered why one installer says £1,200 while another quotes £6,000 for what looks like a similar job, you are not alone. A typical UK homeowner in 2026 replacing an ageing uPVC slider might budget around £2,000, only to find costs rising quickly once structural work, upgraded glazing or made to measure frames are factored in. The biggest mistake is assuming all patio door replacements are like for like swaps. In reality, small changes in opening size, frame material or installation complexity can double or triple the final cost.

The cost to replace a patio door in the UK in 2026 varies widely depending on the style, opening size and level of structural work required. Most homeowners will pay between £900 and £6,500 for supply and fitting, though larger bifold installations or structural alterations can push costs well beyond £10,000.

Patio doors are no longer just functional openings. They affect heat retention, security, natural light and the overall feel of a space. Choosing between sliding, French or bifold doors is not just about budget, but also how you use your home and garden.

This guide breaks down realistic UK costs, explains what drives those costs and highlights where projects often go wrong. If you are planning a replacement or upgrading from a window to a door opening, this will give you a grounded understanding before speaking to a tradesperson.

Average cost to replace a patio door in the UK

For a like for like swap, where you are replacing an existing patio door with a similar size and type, prices are relatively straightforward. Once structural changes are involved, costs increase sharply.

Door Type	Typical Supply Cost	Typical Labour Cost	Total Installed Cost
Sliding patio doors	£600 to £2,500	£250 to £600	£900 to £3,100
French doors	£500 to £1,800	£300 to £700	£900 to £2,500
Bifold doors	£1,500 to £5,500	£800 to £2,500	£2,500 to £8,000+

These figures assume standard sizes and straightforward access. Larger openings, premium frame materials or complex installations will move pricing upwards.

Side by side comparison of patio door types

Factor	Sliding Doors	French Doors	Bifold Doors
Typical cost installed	£900 to £3,500	£900 to £2,500	£2,500 to £10,000+
Lifespan	15 to 25 years	15 to 30 years	20 to 35 years
Maintenance	Low, track cleaning required	Low to medium, hinges and seals	Medium, rollers and alignment
Thermal efficiency	Good with double or triple glazing	Very good sealing when closed	Varies, more frames can reduce efficiency
Space requirements	Minimal	Needs swing space	Requires stacking space
Installation complexity	Low	Low to medium	High, often structural

Sliding patio doors cost and considerations

Sliding doors remain popular for their simplicity and value. Two or three large glass panels run on tracks, with one or more panels sliding behind the other.

Best use cases

Sliding doors are ideal where space is tight. In smaller gardens or flats, you avoid losing space to door swing. They also work well for kitchen extensions where furniture placement is fixed.

Pros and cons

• Pros include affordability, minimal space usage and quick installation
• Cons include partial opening width and potential track wear over time

Typical installation challenges

The most common issue installers see is poor levelling of the base. Even a few millimetres out can cause dragging doors within months. Another frequent problem is insufficient support under the track, particularly in older properties where subfloors are uneven.

In 2026, typical installed prices sit between £900 and £3,100 for uPVC systems. Aluminium options with slimmer frames and better durability cost more, usually £1,800 to £3,500 fitted.

Cost variables include standard sizes versus made to measure units. A standard 1800mm slider may cost £1,000 fitted, while a bespoke 2400mm aluminium system with slim sightlines could reach £3,500 or more.

From a trade perspective, sliding doors are usually the quickest to install. A straight replacement can be completed in half a day. However, weather can delay sealing and silicone curing, especially in winter.

French doors cost and suitability

French doors offer a classic look with two doors opening from the centre. They work well for traditional properties and smaller openings.

Best use cases

They are well suited to period homes, cottages and smaller rear elevations where maintaining character matters. They also work well as secondary garden access points.

Pros and cons

• Pros include full opening width and strong sealing when closed
• Cons include needing clearance space and potential hinge wear over time

Typical installation challenges

Alignment is critical. Installers often encounter uneven brickwork reveals, which can cause doors to bind or fail to lock properly if not corrected during fitting. Timber frames in older homes may also require careful scribing.

Expect to pay between £900 and £2,500 installed. Timber frames cost more but suit period homes. uPVC remains the most budget friendly option.

You can explore a detailed cost breakdown here: How Much Does It Cost to Fit French Doors in the UK in 2026? Supply and Fit Prices, Frame Materials and Labour Explained.

Typical installation time is one day, although properties with non standard openings can take longer due to adjustments and making good.

Bifold doors cost and structural considerations

Bifold doors are the premium choice. They fold and stack to one or both sides, opening up the entire wall to the garden.

Best use cases

They are most effective in open plan extensions where you want a full width opening. They suit larger properties and modern renovations where indoor and outdoor spaces are blended.

Pros and cons

• Pros include maximum opening and strong visual impact
• Cons include high cost, complex installation and more ongoing adjustment

Typical installation challenges

Bifold installations often encounter structural surprises. Hidden pipework, uneven load distribution or poor existing lintels can slow work down. Installers also need precise alignment across the full width, otherwise panels will not fold smoothly.

Supply and fit costs usually range from £2,500 to £8,000, though large aluminium systems or premium brands can exceed £12,000.

The biggest factor with bifolds is structural work. Installing them often involves widening an opening or removing part of a load bearing wall. This requires a structural engineer and steel support.

For a deeper breakdown of costs and structural requirements, see How Much Does It Cost to Install Bifold Doors in the UK in 2026? Supply and Fit Prices, Structural Work and Building Control Fees.

• Steel lintel installation, £1,200 to £3,000
• Building control fees, £200 to £500
• Plastering and making good, £300 to £1,000

Lead times are also longer. Aluminium bifolds often take six to ten weeks to manufacture, compared to two to four weeks for standard uPVC.

Frame materials and how they affect cost

The same door style can vary significantly in price depending on the frame material chosen.

• uPVC, cheapest option, low maintenance, decent thermal performance. Ideal for budget conscious projects.
• Aluminium, slimmer frames, stronger structure, modern appearance. Costs more but lasts longer.
• Timber, premium look, ideal for period properties. Requires ongoing maintenance and carries the highest price.

As a rough guide, aluminium can cost 30 to 60 percent more than uPVC for the same opening. Bespoke timber doors can exceed this further, particularly for heritage properties.

If you are comparing frame materials across other openings in the home, this article gives useful context: How Much Does It Cost to Install a New Front Door in 2026? Composite vs uPVC vs Timber Prices and Fitting Explained.

Energy efficiency and ratings

Modern patio doors are rated using BFRC energy ratings, ranging from A++ to E. Most new installations aim for at least a B rating, with A rated doors becoming standard in higher end installations.

Typical U values for compliance with Part L are around 1.4 W per square metre Kelvin or lower. Triple glazing can reduce this further to around 1.0, improving heat retention but increasing cost.

Better ratings reduce long term heating bills, particularly for large glazed openings where heat loss can otherwise be significant.

Labour costs and timelines

Labour costs depend on access, size and structural work.

Regional cost differences

In London and the South East, labour can be 20 to 30 percent higher than the national average. A standard installation that costs £500 in the Midlands may reach £700 or more in London. Northern regions often offer lower rates, though demand can still push prices up in busy periods.

Typical project timelines

• Simple replacement, £250 to £700, completed in half a day to one day
• Moderate alterations, £800 to £1,500, one to three days
• Major structural work, £2,000+, three to seven days

Time overruns are common where structural work is involved. Waiting on building control inspections or steel delivery can add days.

Additional cost factors

• Made to measure doors add 10 to 25 percent
• Upgraded hardware such as multi point locking, handles or trickle vents, £50 to £300
• Difficult access or scaffold requirements

Qualified installers should be registered with a competent persons scheme such as FENSA or CERTASS, ensuring compliance with building regulations. You can verify installers via https://www.fensa.org.uk or https://www.certass.co.uk.

You can check requirements via the government guidance here: https://www.gov.uk/building-regulations-approval.

Example patio door replacement costs

A realistic scenario helps put pricing into context.

Project: Replace existing sliding door with 3 panel aluminium bifold, widen opening

• Door supply, £4,200
• Labour installation, £1,800
• Structural engineer, £350
• Steel beam supply and install, £1,800
• Building control fees, £300
• Plastering and making good, £600
• Upgraded glazing and hardware, £400

Total project cost: £9,450

This type of project often runs slightly over budget due to unforeseen structural adjustments or finish upgrades.

Building regulations and planning rules

Replacing an existing patio door usually falls under permitted development and does not require planning permission.

However, building regulations approval is still required to ensure:

• Energy efficiency meets Part L standards, typically U values of 1.4 or better
• Safety glazing complies with Approved Document K, using toughened or laminated glass in critical areas
• Structural integrity is maintained if openings are altered

If you are removing load bearing walls, a structural engineer is legally required to specify beam sizes and load paths. Work must comply with HSE guidance for structural safety, available at https://www.hse.gov.uk/construction.

If electrical wiring or sockets are moved as part of the project, a qualified electrician registered with NICEIC should be used. If the work is near a boiler or gas appliance, a Gas Safe engineer may also be required.

Installers registered with schemes like FENSA or CERTASS can self certify their work. FENSA is more widely used for domestic glazing, while CERTASS offers similar certification with slightly different membership requirements.

Further guidance is available from the Planning Portal: https://www.planningportal.co.uk/permission/common-projects/windows-and-doors.

Additional costs to budget for

Many homeowners underestimate the extras that come with patio door replacement.

• Skip hire, £150 to £300 if large amounts of waste are removed
• Internal making good, plastering or redecorating
• External works, patio adjustments or thresholds
• Upgraded glazing, solar control or acoustic glass

If you are upgrading multiple openings, this broader guide is helpful: Understanding the Price of Double-Glazed Windows.

Practical checklist before replacing a patio door

• Measure the existing opening accurately and check lintel condition
• Decide whether you want like for like replacement or a larger opening
• Choose frame material based on budget and property style
• Confirm installer accreditation such as FENSA
• Ask for a full breakdown including making good and disposal
• Check lead times, aluminium systems often take longer

Checklist before hiring an installer

• Ask for proof of FENSA or CERTASS registration
• Request public liability insurance documents
• Ask for recent examples of similar work
• Confirm who handles building control and certification
• Check warranty details for both product and installation
• Watch for vague quotes without itemised costs
• Avoid large upfront payments without written agreement

Common mistakes to avoid

The biggest issues on patio door projects often come down to planning and installation quality.

Underestimating structural work
Homeowners often assume widening an opening is straightforward. Removing a load bearing section without proper support is dangerous and will fail building control.

Choosing price over installation quality
Poor installation leads to leaks, heat loss and doors that do not operate smoothly. Fixing these later often costs more than doing it properly from the start.

Ignoring threshold levels
Getting step heights wrong can lead to water ingress or awkward internal flooring transitions.

Choosing incorrect door configuration
Left or right stacking on bifolds or incorrect hinge orientation on French doors can affect how usable the space is.

Poor drainage planning
External thresholds without adequate drainage channels often lead to water ingress during heavy rain.

Not checking insulation continuity
Gaps around the frame can create cold bridges, reducing overall efficiency.

Not factoring in lead times
Custom doors, especially bifolds, can take six to ten weeks to manufacture.

Which patio door type is best for your home?

Each option has a clear use case.

Sliding doors suit modern homes and limited space.

French doors suit traditional properties and smaller budgets.

Bifold doors suit large openings and open plan living, but demand higher investment.

The right choice depends on space, budget and how you use your home rather than appearance alone.

FAQ

How long does it take to replace a patio door?

A straightforward replacement typically takes half a day to one day. This assumes no structural work and good access. If structural alterations are needed, expect three to seven days including steel installation, inspections and making good. Weather delays can also affect sealing and finishing stages.

Do I need building control approval for a patio door?

Yes, all replacement doors must comply with building regulations. If your installer is FENSA registered, they can self certify and issue a certificate within a few weeks of completion. If not, you must apply through local building control, which typically costs £200 to £500.

Are bifold doors worth the extra cost?

They can be worth it if you regularly use the full opening and want a strong connection to the garden. However, if you only need occasional access, sliding or French doors are more cost effective. Maintenance and adjustment costs are also slightly higher over time.

What is the most energy efficient patio door option?

Triple glazed systems with thermally broken frames and good seals perform best. Look for BFRC A rated doors and U values around 1.0 to 1.4. Installation quality is just as important as the door itself, as gaps or poor sealing reduce efficiency.

Can I replace a window with patio doors?

Yes, but it involves structural work. A structural engineer will specify a lintel or steel beam. Costs typically range from £2,000 to £6,000 depending on size and complexity. Building control approval is required.

How much does it cost to widen an opening for patio doors in the UK?

Widening an opening usually costs between £1,500 and £5,000 depending on wall type and size. This includes structural engineer fees, steel beam installation, labour and making good. Brickwork, insulation and plastering all add to the total. For larger openings supporting upper floors, costs can exceed £6,000. Building control approval and compliance with structural safety standards are mandatory.

Final Thoughts

Replacing a patio door is one of those upgrades that affects both how your home looks and how it functions daily. Costs vary widely, but the biggest differences come down to door type, structural work and installation quality rather than just materials.

Get multiple quotes, ask detailed questions and make sure whoever you hire is properly accredited. A well installed patio door should last decades and improve both energy efficiency and usability.

If you are ready to move forward, the simplest next step is to post a job on BookaBuilderUK and receive free quotes from vetted local tradespeople.