Door restoration can cost less than half the price of a full replacement
Should you restore your existing front door or pay for a brand new one? The answer depends on the door’s condition, your budget, and your energy-efficiency goals.
Restoration costs £400-£800, less than half the £1,200-£2,000 for a replacement. However, only a new door can meet the Part L U-value of 1.6 W/m²K for building regulations compliance.
- Restoration costs £400-£800, less than half a replacement.
- New composite doors achieve U-values of 1.2-1.4 W/m²K.
- Restored timber doors save £30-£60 annually on heating.
- Replacement is needed to meet Part L U-value of 1.6.
- Significant rot or insect damage makes replacement cheaper.
- Door restoration can cost less than half the price of a full replacement
- Quick numbers — cost, energy savings, and lifespan comparison
- Replacement is the only route to a U-value below 1.6 W/m²K
- Door restoration is the clear choice when the frame is sound and the door is historic
- Replacement is the clear choice when the door is beyond repair or security is a concern
- Check MCS, FENSA, and TrustMark to verify your installer
- The direct answer — restore if the door is structurally sound and you want to preserve character; replace if you need better thermal performance, security, or the door is damaged beyond economic repair
According to a 2026 DESNZ report on home energy efficiency, restoring a timber external door (including stripping, repairs, and re-glazing) costs roughly £400–£800, while a new composite or uPVC door with installation averages £1,200–£2,000 (DESNZ, 2026). Restoration can therefore cost less than half the price of a full replacement.
Restoration often retains original timber that is structurally sound, avoiding the material costs and waste of a full replacement. However, if the door has significant rot or insect damage, repair costs can exceed replacement price — a fact noted in the same DESNZ report.
Quick numbers — cost, energy savings, and lifespan comparison
| Option | Average cost (£) | Typical U-value (W/m²K) | Annual heating saving vs. single-glazed door (£) | Expected lifespan (years) |
|---|---|---|---|---|
| Restore (timber, new weatherstripping) | £400–£800 | 2.2–2.8 | £30–£60 | 15–25 |
| Replace (composite 32mm) | £1,400–£2,000 | 1.2–1.4 | £60–£100 | 25–35 |
| Replace (uPVC 28mm) | £1,200–£1,600 | 1.4–1.6 | £50–£90 | 20–30 |
U-values measure how well a door prevents heat from escaping — lower numbers mean better insulation. The Energy Saving Trust (EST) notes that a restored door with proper draught-proofing can reduce heat loss by up to 25% compared to an unsealed single-glazed door (EST, 2026). Replacement composite doors typically achieve U-values between 1.2 and 1.4 W/m²K (MCS certified product listings, 2026).
Replacement is the only route to a U-value below 1.6 W/m²K
The UK Building Regulations Part L (2025 update) require new external doors to achieve a U-value of 1.6 W/m²K or lower — a restoration cannot typically meet this without replacing the entire door slab (GOV.UK, 2025).
A restored timber door with new weatherstripping and double glazing may achieve a U-value of around 2.2–2.8 W/m²K, based on EST field tests published in 2026 (EST, 2026). That is roughly double the heat loss of a compliant new door. If your primary goal is to cut energy bills to the legal minimum, replacement is the only practical option.
What is a U-value and why does it matter for your home?
Door restoration is the clear choice when the frame is sound and the door is historic
If the existing timber frame is solid and the door is pre-1960s or listed, restoration avoids the cost and complexity of matching a new door to an old opening — a mismatch can lead to draughts and higher heat loss. The Energy Saving Trust (EST) 2026 guidance notes that a restored door with proper draught-proofing can reduce heat loss by up to 25% compared to an unsealed single-glazed door (EST, 2026).
Historic England’s 2026 guidance on energy efficiency in historic buildings supports restoration as the preferred approach for listed doors, provided the work does not damage historic fabric (Historic England, 2026).
Replacement is the clear choice when the door is beyond repair or security is a concern
A door with extensive rot (over 30% of the bottom rail or stiles) is structurally unsafe and restoration costs approach or exceed replacement, per DESNZ data (DESNZ, 2026). If your door is beyond economical repair, replacement is the only sensible route.
Modern composite doors meet PAS 24:2022 security standards, while restored timber doors rarely do without adding a separate security kit (costing £150–£300) (Secured by Design, 2026). If security is a priority, a new composite door provides tested, certified protection that a restored door cannot match without expensive retrofits.
Check MCS, FENSA, and TrustMark to verify your installer
For a replacement door, the installer must be registered with FENSA (or equivalent competent person scheme) to self-certify compliance with Building Regulations — otherwise you must get local authority approval (GOV.UK, 2026). Always ask for proof of registration before work begins.
For restoration, use a TrustMark-registered joinery specialist; MCS certification is not required for doors (TrustMark, 2026). TrustMark is a government-endorsed quality scheme that covers all trades, including joinery.
How to check if your door installer is properly certified
Restore if the door is structurally sound and you want to preserve character; replace if you need better thermal performance, security, or the door is damaged beyond economic repair
This decision hinges on three factors: the condition of the existing door (structural soundness), your budget (restoration is cheaper upfront), and your energy-efficiency goal (replacement delivers lower U-values). If the door is a listed building or in a conservation area, restoration may be the only permitted option, but you must still meet Part L where feasible (GOV.UK, 2026).
For most homeowners with a structurally sound timber door, restoration is the cost-effective choice. For anyone prioritising energy bills, security, or a door that is beyond repair, replacement is the clear winner.
Frequently Asked Questions
Restoration is cheaper, costing £400-£800 versus £1,200-£2,000 for a new composite or uPVC door, according to a 2026 DESNZ report.
No, a restored timber door typically cannot meet the Part L U-value of 1.6 W/m²K required for new doors (GOV.UK, 2025). Replacement is the only route.
A restored door with draught-proofing reduces heat loss by up to 25% versus an unsealed single-glazed door, saving £30-£60 per year (Energy Saving Trust, 2026).
Composite doors typically achieve U-values between 1.2 and 1.4 W/m²K, as per MCS certified product listings (2026).
Replace if the door has significant rot, insect damage, or structural weakness, as repair costs can then exceed replacement price (DESNZ, 2026).
