What restoration actually involves
A joiner strips the sash back, replaces rotten sections of timber, rehangs it with new cords or refurbished weights, and often adds discreet brush or compression draught seals into the frame. Done well this can genuinely cut draughts and rattling while keeping every original pane and glazing bar exactly as built.
When restoration is the only route open to you
If your house is listed, or your windows are original and your street sits in a conservation area, planning rules very often require repair over replacement, and in some cases prohibit uPVC outright regardless of how convincing the foil finish looks. It is worth checking with your local planning department before assuming either option is available.
Where uPVC replacement wins on paper
A modern uPVC sash uses a sealed double or triple glazed unit with a warm edge spacer and low-E coating, giving a U-value that a single glazed, draught stripped timber sash cannot match, secondary glazing aside. It also needs no repainting, no re-cording and no rot inspection, which matters if you do not want an ongoing maintenance relationship with a joiner.
Our uPVC sash windows start at £780 fully fitted, which is frequently comparable to, or less than, a full joinery restoration of an equivalent number of original sashes, though restoration quotes vary enormously with the condition of the timber.
| Factor | Timber restoration | uPVC replacement |
|---|---|---|
| Thermal performance | Improved, not sealed unit level | Sealed unit, warm edge spacer, low-E |
| Conservation area suitability | Usually required or preferred | Often restricted or refused |
| Ongoing maintenance | Repainting, re-cording over time | Wipe clean, no repainting |
| Typical one-off cost | Varies with timber condition | From £780 per window, fitted |
Maintenance over the years that follow
Timber needs repainting on a cycle, typically every five to eight years depending on aspect and exposure, plus occasional attention to putty and cords. uPVC does not need painting and the foil or solid colour is designed to be wiped rather than maintained, though it is a sealed system that cannot be repaired timber-style if it is ever damaged, it is replaced.
Being honest about where we sit
We fit uPVC sash replacements and we are upfront that we do not carry out timber restoration, so if your house is listed or your conservation officer requires repair, you need a specialist joiner, not us. If replacement is permitted and you want the thermal and maintenance benefits, that is where we can help.
We would rather tell you that upfront during a survey than quote for a job that planning rules will not allow, since it saves everyone time and avoids a wasted measured visit.
Draught proofing short of a full restoration
If a full joinery restoration is out of budget for now, brush strip or compression draught seals can be fitted into an existing timber sash frame without touching the glazing or the sash cords, cutting cold air infiltration for a fraction of the cost. Secondary glazing, a separate discreet pane fitted inside the existing window, adds real thermal and noise benefit while leaving the original sash completely untouched, which is often the recommended route where a conservation officer will not allow any change to the outer window at all.
Neither approach reaches the performance of a sealed double glazed unit, but both are worth knowing about as a staged option if you are not ready to commit to full restoration or replacement in one go.
Listed building consent and conservation officers
A listed building normally needs listed building consent for any change to windows, separate from planning permission, and this applies even to repairs in some cases, not only replacement. A conservation area does not automatically mean listed status, but it can still restrict window replacement on elevations visible from the street through an Article 4 direction, so it is worth asking your council specifically about your property rather than assuming a conservation area label alone tells you the answer.
Noise reduction: does the material matter?
Noise reduction comes mainly from the glazing, not the frame material, so a well sealed timber sash with a good secondary glazing pane can perform similarly to a sealed uPVC double glazed unit for traffic noise. Where uPVC has the edge is in the seal around the moving sash itself, since a factory made gasket on a uPVC frame tends to compress more consistently over years than a timber to timber fit that can loosen slightly as the wood moves with the seasons.
A simple way to decide
Start with the planning question, since that alone can settle it: check with your council whether your house is listed or your street is a conservation area with window restrictions. If restoration is not required, weigh the ongoing repainting and cord maintenance of timber against the lower maintenance and better sealed thermal performance of uPVC, and get quotes for both before deciding, since actual costs depend heavily on the condition of your existing frames.
There is no single right answer here. Restoration keeps original timber and is often the only legally allowed option in a conservation area or on a listed building, while uPVC replacement gives better thermal performance and lower ongoing maintenance for a similar or lower one-off cost.
Useful pages on this site
Ask us honestly which route suits your house
If uPVC replacement is right for your situation we will quote it plainly, and if it is not, we will say so.