Project Type
Single-Storey Rear Extension
Duration
14 weeks
Project Value
£88,000
The Challenge
The property was on the edge of Highgate Conservation Area, meaning Haringey's planning officers applied conservation area design sensitivity to the application despite the property itself not being listed. The rear garden was on a slight slope, requiring the extension floor to be stepped down by 150mm from the existing ground floor — this complicated the kitchen layout design and the underfloor heating screed detail.
Our Solution
Our architect designed a simple contemporary rear extension that referenced Highgate's building tradition — brick to match the existing house, a flat roof with upstand, and a clean rooflight. Haringey's conservation officer agreed the design was appropriate. The stepped floor level was resolved by designing the kitchen island to bridge the step elegantly, and the underfloor heating specification was adjusted to use a thinner screed on the lower section.
Results
- ✓Haringey planning approval at officer level — first submission
- ✓20m² kitchen-diner created at lower garden level
- ✓Bifold doors opening full width across rear garden aspect
- ✓Large rooflight — natural light throughout working day
- ✓Kitchen island spanning step between old and new floor levels
- ✓Wet underfloor heating throughout extension
- ✓Estimated property value uplift: £95,000
Key Features
- ✓Haringey conservation area planning consent
- ✓Matching stock brick external walls
- ✓Full-width bifold doors to garden
- ✓Structural rooflight — 3000×900mm
- ✓Bespoke kitchen island spanning floor level change
- ✓Wet underfloor heating in 65mm screed
Specification
| Item | Specification |
|---|---|
| Extension walls | London stock brick, matching existing house, lime mortar, cavity insulated |
| Bifold doors | Smart Architectural Aluminium three-panel bifold, RAL 9005, double-glazed |
| Rooflight | Roofglaze Skyview fixed rooflight, 3000×900mm, triple-glazed low-E |
| Kitchen | Handle-less slab-fronted kitchen, Quartz Calcutta worktops, Neff slide-and-hide appliances |
| UFH | Heatmiser Neo wet underfloor system, 65mm screed to lower section, 75mm to main area |
| Flat roof | Sarnafil S327 single-ply PVC membrane, mechanically fixed, 20-year guarantee |
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