Sash Window Repair
in Islington
Serving Islington, Angel, Highbury, Canonbury and surrounding areas — free survey, no call-out fee, 5-year guarantee.
Islington is known for its Georgian townhouses and period properties. At Hartwell Sash, we restore original timber sash windows using traditional methods — no unnecessary replacements, just honest craftsmanship that lasts.
Complete sash window restoration
Every service is carried out with care and precision. Here is exactly what we do and how we do it.
🌬️ Draught Proofing
Cold air and noise entering through your sash windows — eliminated permanently, without changing the appearance of your windows.
- Full inspection of frame, sashes and existing beads
- Both sashes carefully removed from the frame
- Staff bead replaced with brush pile bead — both sides
- Parting bead replaced with brush pile bead — both sides
- Brush seal fitted to meeting rail — eliminates central gap
- Sashes re-hung, balanced and tested
🔧 Sash Cord Replacement
Windows that slam shut or won’t stay open — fixed properly. We replace all four cords and rebalance both sashes as standard.
- Staff beads removed to access the sash
- Both upper and lower sashes removed and inspected
- Weight box opened — cast iron weights cleaned and checked
- All four cords replaced with quality waxed sash cord
- Pulley wheels oiled and tested
- Sashes re-hung, balanced and tested — windows left perfect
🪟 Glass Replacement
Cracked, broken or misted panes replaced carefully — preserving the original timber frame. Heritage glass available for Conservation Areas.
- Free survey to assess glass type and frame condition
- Glass sourced to match original specification
- Sash removed, old glass carefully taken out
- New glass fitted, sealed and putty finished
- Sash re-hung and tested — area left clean
🪵 Timber Repair & Repainting
Rotting timber repaired, not replaced. Professionally repainted to protect your windows for years to come.
- Full inspection to assess extent of damage
- Damaged timber cut back to sound wood
- Epoxy filler or replacement timber used to rebuild
- Sections shaped and sanded to match original
- Windows primed, undercoated and finished professionally
- Ironmongery cleaned, adjusted or replaced
🏠 Sash Replacement
When replacement is necessary, we supply heritage timber sash windows made to match your original design. We always repair first — but when replacement is right, we do it properly.
- Free survey to confirm whether repair or replacement is needed
- Where box frame is sound, only sash units replaced — original shutters preserved
- New sashes manufactured to measure in timber
- Ironmongery and pulley wheels replaced as standard
- Single glass, slimline double glazing or heritage glass as required
- Fitted, balanced, sealed and painted — property left clean
Why Islington homeowners
choose Hartwell Sash
Restore First
We never recommend replacement when repair will do the job. Your original windows are always our priority.
Period Specialists
Victorian, Georgian, Edwardian — we understand Conservation Areas and Listed Buildings in Islington.
5-Year Guarantee
Every job is covered by a 5-year workmanship guarantee. Fully insured and fully accountable.
Free survey in Islington
We visit your property, assess every window and give you an honest quote — no call-out fee, no obligation, no pressure.