Project Type
Single-Storey Rear Extension
Duration
13 weeks
Project Value
£82,000
The Challenge
The rear garden was partly sunken below ground-floor level, meaning the proposed extension had a floor level 300mm above the garden — creating a step down from the bifold doors to the garden. The clients wanted a level threshold to the garden for accessibility and aesthetic reasons. The extension also required a party wall award with both neighbouring properties.
Our Solution
We raised the garden level in the patio area immediately adjacent to the extension using permeable paving on a compacted MOT Type 1 base, creating a continuous level from the extension floor to the garden. Drainage channels were installed at the transition. Both party wall awards were agreed within 4 weeks. The completed patio with matching porcelain tile connected the indoor and outdoor spaces seamlessly.
Results
- ✓Barnet planning approval in 7 weeks
- ✓Both party wall awards agreed in 4 weeks
- ✓Level threshold achieved — 40m² matching patio created
- ✓26m² open-plan kitchen-family room created
- ✓Four-panel bifold doors at flush threshold to garden
- ✓Structural rooflight — 2400×1200mm
- ✓Estimated property value uplift: £105,000
Key Features
- ✓Barnet planning consent
- ✓Level threshold to garden — patio raised and matched
- ✓Matching porcelain tile inside and outside
- ✓Four-panel bifold doors — full-width garden connection
- ✓Structural rooflight over main space
- ✓Underfloor heating throughout extension
Specification
| Item | Specification |
|---|---|
| Extension walls | Brick-and-block construction, 100mm cavity insulation, render exterior matching house |
| Bifold doors | Aluminium four-panel bifold, 3600mm wide, flush threshold, RAL 9005, double-glazed |
| Rooflight | Glazing Vision Flushglaze 2400×1200mm, triple-glazed, walk-on rated |
| Patio | Porcelanosa Starlight Grey, 600×600mm, on permeable sub-base, matching extension floor tile |
| Drainage channel | Stainless steel linear drain, ACO RainDrain, at door threshold, connected to soakaway |
| UFH | Warmup Clypso wet system, 75mm screed, zone controlled, extension footprint only |
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