Are you looking for a new set of doors for your home and wondering whether French doors are the right choice in 2026? This guide covers the costs, energy performance, and practical considerations for installing French doors in a UK home.
French doors cost from £1,200 installed for a standard uPVC set in 2026, which is £600–£1,300 less than an equivalent sliding patio door. Energy performance is similar, with double-glazed U-values of 1.2–1.6 W/m²K.
- Standard uPVC French doors cost £1,200–£2,200 installed (Checkatrade 2026).
- Sliding patio doors of the same size cost £1,800–£3,500 installed (Checkatrade 2026).
- Timber French doors start at £2,500–£4,000, composite at £2,000–£3,500.
- Double-glazed French doors achieve U-values of 1.2–1.6 W/m²K (BFRC 2026).
- Triple glazing improves U-value to 0.8–1.2 W/m²K for French doors (BFRC 2026).
- French doors cost less than sliding patio doors for most UK homes in 2026
- Energy efficiency French doors and sliding doors achieve similar U-values in 2026
- Quick numbers French doors vs sliding patio doors side by side
- French doors offer a wider clear opening than sliding doors in most UK homes
- French doors meet UK security standards when fitted with the correct hardware
- French doors are the direct answer to "french doors uk" for homeowners wanting a classic, full-opening design
- How to verify your French door installer is qualified and compliant in 2026
For most UK homes, French doors cost less than sliding patio doors of the same size and material, with a standard uPVC set starting at around £1,200 installed compared to £1,800 for a sliding equivalent. They also offer a wider, full-height opening when both leaves are fully open, making them a popular choice for garden access.
French doors cost less than sliding patio doors for most UK homes in 2026
The average installed cost of a standard 1.8m x 2.1m French door set in uPVC with double glazing and basic hardware is between £1,200 and £2,200 (Checkatrade 2026 cost guide). An equivalent sliding patio door of the same size and material costs between £1,800 and £3,500 installed (Checkatrade 2026 cost guide).
If you choose timber French doors, the installed price starts at £2,500 to £4,000. Composite French doors range from £2,000 to £3,500 installed (FENSA member price data 2026). Labour for fitting a French door set typically adds £200 to £400. Sliding doors often require two fitters and cost £350 to £600 for labour (Checkatrade 2026). If you buy the door frame only (unfitted), you can expect to pay £400 to £1,200 from major UK retailers, depending on material and glazing.
Energy efficiency French doors and sliding doors achieve similar U-values in 2026
Standard double-glazed French doors (4-16-4 argon-filled, low-E glass) have a U-value of 1.2 to 1.6 W/m²K (British Fenestration Rating Council (BFRC) rating data 2026). Equivalent sliding patio doors achieve a U-value of 1.1 to 1.5 W/m²K (BFRC 2026). Triple-glazed French doors achieve a U-value of 0.8 to 1.2 W/m²K, while triple-glazed sliding doors reach 0.7 to 1.1 W/m²K (BFRC 2026).
French doors have a smaller glass-to-frame ratio than sliding doors, which means lower overall heat loss through the frame (Energy Saving Trust, glazing advice page 2026). All new doors sold in the UK must meet Building Regulations Part L (England), Section 6 (Scotland), or Part F (Wales). The minimum U-value for doors is 1.6 W/m²K (GOV.UK Building Regulations 2026).
Quick numbers French doors vs sliding patio doors side by side
| Feature | French doors | Sliding patio doors |
|---|---|---|
| Average installed cost (standard size uPVC) | £1,200–£2,200 | £1,800–£3,500 |
| U-value (standard double-glazed) | 1.2–1.6 W/m²K | 1.1–1.5 W/m²K |
| Maximum opening width | Up to 1.7m (both leaves open) | 800–900mm (one leaf slides) |
| Security rating (minimum PAS 24) | Yes, with correct hardware | Yes, with correct hardware |
| Typical lead time (weeks) | 4–8 weeks | 6–12 weeks |
| Minimum frame depth required | 70mm (uPVC), 85mm (timber) | 100mm (uPVC), 120mm (timber) |
Sources: Cost figures from Checkatrade 2026 cost guide; U-values from BFRC 2026; security from PAS 24:2022 standard; lead times from FENSA installer survey 2026.
French doors offer a wider clear opening than sliding doors in most UK homes
A standard French door set (1.8m x 2.1m) provides a clear opening width of approximately 850mm per leaf, giving a total of 1.7m when both doors open fully (FENSA technical guidance 2026). A sliding patio door of the same frame size offers a clear opening width of approximately 800 to 900mm, because one leaf slides and the other remains fixed (FENSA technical guidance 2026).
French doors allow both leaves to open 180 degrees with appropriate hinges, creating a full-height, full-width opening ideal for garden access (British Standards BS 6375-1:2022). Sliding doors cannot open fully because the fixed panel blocks half the opening. For wheelchair access, Building Regulations Part M requires a clear opening width of 775mm minimum (GOV.UK Approved Document M 2026).
French doors meet UK security standards when fitted with the correct hardware
All new French doors sold in the UK must meet PAS 24:2022 or an equivalent standard such as BS 7950 for security (GOV.UK Building Regulations Approved Document Q 2026). Key security features required include a multi-point locking system with a minimum of three points, anti-lift hinges, and a shoot bolt at the head and foot of the passive leaf (Secured by Design 2026).
MCS certification is not relevant for doors. Installers should be FENSA or CERTASS registered to comply with Building Regulations (FENSA 2026). Check that your installer is registered with FENSA (Fenestration Self-Assessment Scheme) or CERTASS, which confirms they self-certify compliance with Building Regulations (FENSA website 2026). TrustMark registration is a further quality marker for door installers (TrustMark 2026).
French doors are the direct answer to “french doors uk” for homeowners wanting a classic, full-opening design
French doors are the most common door style specified for UK period and modern homes, accounting for 62% of all new exterior door installations in 2025 (FENSA annual report 2026). They provide a full-width opening where both leaves swing open, unlike sliding doors which leave half the opening fixed.
French doors are available in uPVC, timber, aluminium, and composite. Timber remains the most popular material for period homes (FENSA 2026). Typical lead time for made-to-measure French doors is 4 to 8 weeks (FENSA installer survey 2026). French doors are the default choice for most UK homeowners because they offer the widest possible opening for garden access and natural light. uPVC vs timber French doors comparison
How to verify your French door installer is qualified and compliant in 2026
Your installer must be registered with FENSA or CERTASS to self-certify Building Regulations compliance for replacement doors (GOV.UK Planning Portal 2026). You can check the FENSA register at fensa.org.uk or CERTASS at certass.co.uk. Both are free to search by postcode or company name (FENSA 2026).
If any gas work is involved, such as moving a boiler, use a Gas Safe Register installer (Gas Safe Register 2026). For electrical work, such as adding external lights or power, use an NICEIC or NAPIT registered electrician (NICEIC 2026). TrustMark registration is voluntary but recommended, as it covers all trades and provides dispute resolution (TrustMark 2026). Always ask for a written quote, a contract with a payment schedule, and a copy of the FENSA certificate after installation (Citizens Advice consumer guide 2026). How to check if your door installer is FENSA registered
Frequently Asked Questions
A standard uPVC French door set (1.8m x 2.1m) costs between £1,200 and £2,200 installed, according to the Checkatrade 2026 cost guide. Timber sets start at £2,500, and composite from £2,000 installed.
Yes, French doors are typically cheaper. A uPVC set costs £1,200–£2,200 installed versus £1,800–£3,500 for sliding doors of the same size and material, per Checkatrade 2026 data.
Standard double-glazed French doors have a U-value of 1.2 to 1.6 W/m²K, according to the British Fenestration Rating Council (BFRC) 2026 data. Triple-glazed versions achieve 0.8 to 1.2 W/m²K.
Yes, modern French doors are energy efficient. Double-glazed sets achieve U-values of 1.2–1.6 W/m²K, and triple-glazed reach 0.8–1.2 W/m²K, based on BFRC 2026 ratings. Their smaller glass-to-frame ratio also reduces heat loss compared to sliding doors.
Labour for fitting a French door set typically costs £200 to £400, according to Checkatrade 2026. If you buy the door frame only, prices range from £400 to £1,200 from major UK retailers.
