Sash windows: complete guide
How sash windows work, your options, and what to expect from a project.
Read the guide →Sash windows, done right
Sash window quotes for uPVC & timber
Restore the originals or replace them like-for-like — get free, no-obligation quotes from vetted local installers who understand period homes and conservation-area rules.
- uPVC or timber, restore or replace — quoted by specialists
- Vetted installers experienced with period and listed properties
- Typical price ranges explained, with no pressure to proceed
Get your sash window quotes
Takes about a minute — free and no obligation.
Restore or replace? Two honest routes
Sound original sashes are often worth saving; tired or rotten frames may be better replaced. A good installer will tell you which makes sense for your home.
Restore the originals
- Keeps the period detail, glass and proportions that suit older homes.
- Repairs to cords, weights, beading and rotten sections; draught-proofing added.
- Usually the preferred route in conservation areas and on listed buildings.
- Often more cost-effective than full replacement where frames are sound.
Replace like-for-like
- New timber or uPVC sashes with modern draught seals and double glazing.
- Better thermal performance and lower maintenance than very old frames.
- Slim sightlines and heritage detailing are available to match the street.
- Sensible where existing frames are beyond economical repair.
uPVC vs timber sash windows
Both can look the part when specified well. The right choice depends on your home, your budget and whether you’re in a conservation area.
| Consideration | Timber sash | uPVC sash |
|---|---|---|
| Heritage look | Authentic profiles and putty lines; ideal for period and listed homes. | Good modern “heritage” ranges; mechanical joints can read slightly heavier. |
| Maintenance | Periodic repainting and care; long-lived when maintained. | Wipe-clean; no repainting, though colour options are more limited. |
| Thermal performance | Strong with modern draught seals and slim double glazing. | Strong; multi-chamber frames insulate well. |
| Conservation areas | Usually preferred, sometimes required by the local authority. | May be restricted; always check local planning guidance first. |
| Typical cost | Higher upfront; ranges vary with size, glazing and detailing. | Often lower upfront; ranges vary by specification and installer. |
In a conservation area or listed building?
Replacement windows in conservation areas and on listed buildings are often controlled by planning rules or an Article 4 direction — and timber like-for-like is frequently expected. Restoration or slim-profile replacements are usually the safest routes. Always check with your local planning authority before committing, and use installers who have worked on period properties.
Specialists who respect the original
We match you with vetted, accredited local installers experienced with period properties — then you compare free, no-obligation quotes and decide in your own time.
- Installers assessed for accreditation such as FENSA or CERTASS, and awareness of conservation-area requirements.
- Firms experienced with sash mechanisms, draught-proofing and sympathetic replacement on older homes.
- Insurance-backed guarantees and deposit-protection arrangements are common in the industry — ask each installer what they offer.
- Free, no-obligation quotes so you can compare like-for-like before deciding anything.
-
Tell us about your windows
Answer a couple of quick questions and share your postcode so we can match you locally.
-
Get matched locally
We connect you with vetted installers who work on sash and period windows in your area.
-
Compare your quotes
Receive free, no-obligation quotes for restoration or replacement and choose what suits you.
Thousands of UK homeowners compare quotes this way. Prefer to read installer reviews first? You can see verified installer reviews before you request quotes.
Sash window guides
Plain-English guides to prices, materials, restoration and the rules that apply to period homes.
Sash window prices
Typical price ranges for restoration and replacement, and what drives them.
See prices →uPVC vs timber sash
Looks, upkeep, performance and cost compared, side by side.
Compare materials →Sash window restoration
What restoration involves and when saving the originals makes sense.
Learn more →Draught-proofing
Cut draughts and rattles without losing the period character.
Learn more →Double glazed sash windows
Slim double glazing options for warmer, quieter period rooms.
Learn more →Conservation areas
Planning rules, Article 4 directions and what installers should know.
Learn more →Sash mechanisms
Cord-and-weight vs spiral balances, and how each is repaired.
Learn more →How to get quotes
What to ask, how to compare like-for-like, and what to watch for.
Learn more →Ready to compare sash window quotes?
Tell us a little about your windows and we’ll match you with vetted local specialists. Free, no-obligation, and no pressure to proceed.
Get my sash window quotes →Sash window questions
Should I restore or replace my sash windows?
If the frames are structurally sound, restoration with draught-proofing often keeps the character and works out cost-effectively. Where timber is rotten or beyond economical repair, like-for-like replacement may be the better route. An installer’s survey will confirm which suits your windows.
Are uPVC sash windows allowed in a conservation area?
It depends on your local planning authority. Many conservation areas and listed buildings expect timber like-for-like, and some have an Article 4 direction removing permitted-development rights. Always check locally before ordering — our conservation-area guide explains what to look for.
How much do sash windows cost?
Costs vary widely with size, material, glazing and the amount of repair or joinery needed, so we quote as typical ranges rather than fixed figures. Our sash window prices guide explains the main factors, and a home survey gives an accurate quote.
Can old sash windows be double glazed?
Often yes. Slim double-glazed units can be fitted to many timber sashes, or you can replace with new double-glazed sashes. Our double glazing guide covers the options for warmer, quieter rooms.
Do I have to accept a quote?
No. Every quote is free and no-obligation. Compare as many as you like, take your time, and only proceed if you’re happy.
Sash windows, quoted by specialists
uPVC or timber, restore or replace — get free, no-obligation quotes from installers who respect the original.
Start my free quotes →