Sash Window Restoration
Belsize Park Gardens: 18 Sash Windows Restored
Belsize Park
Location
Belsize Park, NW3
Completed
August-September 2024
Duration
4 weeks
Investment
£14,500
Client
Private Residence
The Challenge
An impressive Edwardian house on Belsize Park Gardens had 18 original timber sash windows that had not been maintained for over 20 years. Many windows were painted shut, sash cords had snapped, several bottom rails showed significant timber decay, and draughts were severe. The client had been quoted £45,000 for full uPVC replacement but wanted to preserve the original character.
Key Challenges
Volume of Windows
18 windows each requiring individual assessment and bespoke repair work — a significant logistical and scheduling challenge.
Varied Decay Levels
Some windows needed minor maintenance while others required substantial timber replacement, each demanding a different approach.
Working While Occupied
The family remained in the house throughout, requiring careful scheduling to maintain weathertightness at all times.
Our Solution
We systematically restored all 18 windows over 4 weeks. Each window was carefully removed and assessed individually. Rotten timber sections were cut out and spliced with Accoya (a sustainably modified hardwood with 50-year durability). All sash cords were replaced with premium waxed cotton cord. Brush-pile draught-proofing strips were fitted to all meeting rails and parting beads. Windows were finished with Teknos Aquatop microporous paint in off-white — a breathable system that protects the timber while allowing moisture to escape.
Project Approach
1
Survey & Materials
(3 days)Individual survey of all 18 windows, timber ordering, materials preparation.
2
Restoration — Ground Floor
(8 days)Restore 8 ground-floor windows including timber repairs, sash cords, draught-proofing, and painting.
3
Restoration — Upper Floors
(9 days)Restore 10 upper-floor windows from ladder/scaffold with same comprehensive overhaul.
Technical Specifications
Paint Brand
Teknos Aquatop 2600
Finish
Microporous satin (breathable, UV-resistant)
Colors Used
Off-White (custom match to existing)
Application
1 coat primer, 2 coats Aquatop topcoat
Preparation Work
Timber splice repairs (Accoya), sash cord replacement, draught-proof strip fitting, hand sanding
Results & Outcomes
All 18 windows now open, close, and lock perfectly
Draughts eliminated — client reported noticeably warmer rooms
Total cost £14,500 vs. £45,000 for uPVC replacement — 68% savings
Original Victorian character of the property fully preserved
Microporous paint system expected to last 8-10 years before next maintenance
"We needed all 18 sash windows restored and repainted. The attention to detail was remarkable — every window now operates perfectly and the paintwork is museum quality."
Catherine B.
Homeowner
Project Gallery
Restored sash windows on Belsize Park Gardens
Timber repair and sash cord replacement
Services Provided
Related Service
Sash Window Painting & Restoration
Complete sash window restoration for period properties in Hampstead NW3. Preserve your original timber frames, eliminate draughts, and achieve a flawless microporous finish.
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