Replace Sash Windows
London
Heritage replacements that honour your property — when repair is no longer enough.
We always try to repair before we replace. But when a window is beyond saving, we supply and fit heritage timber sash windows that match the original design, profile and character of your property. Because your home deserves better than uPVC.
Sash replacement — without the box frame
🏠 Replace Only What Needs Replacing
In many cases, the timber box frame is in perfectly good condition. Replacing it unnecessarily means more disruption, higher cost, and potential damage to original features such as internal shutter systems, architraves and plasterwork.
Where the box frame is sound, we replace only the sash units — the moving parts of the window. Cleaner, faster and significantly less expensive.
- Box frame retained — no unnecessary structural disruption
- Original shutter systems and cornices left undisturbed
- Minimal mess — no major building work required
- Lower cost compared to full frame replacement
🔧 Step by Step
- Free survey — we assess the frame and confirm the best approach
- New sashes manufactured to measure in timber with slim sightlines
- Ironmongery and pulley wheels replaced as standard
- Glazed with single glass, slimline double glazing or heritage glass
- Old sashes carefully removed — box frame untouched where possible
- New sashes fitted, balanced, sealed and painted — property left clean
🪟 Glazing Options
New sashes can be glazed with traditional single glass, slimline double glazing for improved energy efficiency, or heritage glass to match the original appearance — depending on your property’s requirements.
Why choose Hartwell Sash
Restore First
We always try to repair before replacing — and we’ll tell you honestly which is right for your windows.
Heritage Timber
Solid timber — not uPVC. Made to match your original windows exactly.
5-Year Guarantee
Every installation covered by a 5-year workmanship guarantee. Fully insured.
Get a free survey
We visit your property, assess your windows and give you an honest quote — no call-out fee, no obligation.