Project Type
Single-Storey Rear Extension
Duration
16 weeks
Project Value
£95,000
The Challenge
Hampstead Garden Suburb Trust will not permit flat-roof extensions to Arts & Crafts properties — a pitched roof with traditional materials is required. A pitched roof extension is structurally and technically more complex than a flat roof and significantly more expensive. The existing rear elevation had an original Arts & Crafts bay window that the clients wanted to retain, requiring the extension to be designed around it.
Our Solution
Our architect designed a pitched-roof extension with matching clay peg tiles, gabled end, and timber details sympathetic to the Arts & Crafts character of the house. The existing bay window was retained as an internal feature, framed by the new extension walls. Both Barnet and Trust consents were obtained in 12 weeks. The traditional construction used lime mortar and timber frame rather than block and mortar.
Results
- ✓Barnet LBC and HGS Trust dual consent obtained in 12 weeks
- ✓Pitched clay tile roof — matching existing house materials
- ✓Original Arts & Crafts bay window retained and reframed
- ✓24m² open-plan kitchen-diner created
- ✓Crittal-profile glazing to gable end — Trust-approved
- ✓Underfloor heating throughout extension
- ✓Estimated property value uplift: £160,000
Key Features
- ✓HGS Trust-approved pitched clay tile roof
- ✓Timber frame construction — lime mortar and traditional materials
- ✓Existing Arts & Crafts bay window retained as internal feature
- ✓Crittall-profile gable end glazing
- ✓Underfloor heating — wet system
- ✓Bespoke kitchen with Shaker cabinets and quartz worktops
Specification
| Item | Specification |
|---|---|
| Roof structure | Cut roof timber frame, C24, Keymer clay peg tiles to match existing, lime mortar bedding |
| External walls | Timber frame with brick-slip cladding, matching existing roughcast render to upper section |
| Gable glazing | Crittall Homelight W20 gable glazing, RAL 9005, fixed and opening lights, double-glazed |
| Kitchen | Bespoke in-frame Shaker kitchen, Silestone Eternal Calacatta, Bosch integrated appliances |
| UFH | Warmup Clypso wet system, 75mm screed, manifold zone controlled from kitchen |
| Flooring | Engineered oak wide board, character grade, UV oiled, throughout extension |
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