Project Type
Wraparound Extension
Duration
18 weeks
Project Value
£128,000
The Challenge
The 1930s semi had a utility side passage and a rear conservatory that both required demolition before the new extension could be built. Haringey LBC required a full planning application as the combined extension size exceeded Permitted Development limits. The wraparound design required structural walls to be removed on two sides simultaneously — requiring a temporary steel propping structure during the critical phase.
Our Solution
Our structural engineer designed a temporary propping scheme using acrow props and needles that was installed before any structural works began. The steel beam at the rear wall and the parallel beam for the side return were installed simultaneously in a planned one-day steel installation. Planning was approved by Haringey in 10 weeks. The conservation-approved demolition of the existing conservatory was sequenced carefully to minimise structural risk.
Results
- ✓Haringey planning approval in 10 weeks
- ✓Two-sided structural wall removal — temporary propping scheme executed safely
- ✓55m² open-plan ground floor created from formerly divided rooms
- ✓3×2 grid of rooflights — 5.4m² of overhead daylight
- ✓Full-width bi-fold doors to garden — 5.2m opening
- ✓Bespoke kitchen with island seating for six
- ✓Estimated property value uplift: £220,000
Key Features
- ✓Haringey planning consent — wraparound exceeding PD limits
- ✓Two-sided structural wall removal with engineered propping
- ✓Rooflight grid — 6 rooflights across flat roof
- ✓Full-width 5.2m bi-fold doors to rear garden
- ✓Bespoke island kitchen with quartz worktops
- ✓Underfloor heating throughout full extension footprint
Specification
| Item | Specification |
|---|---|
| Steel beams | Two certified RSJ beams, rear and side, engineered to carry combined structural load |
| Rooflights | Glazing Vision Flushglaze rooflights, 6× 900×900mm, triple-glazed, walk-on rated |
| Bi-fold doors | Smart Aluminium six-panel bi-fold, 5200mm wide, RAL 7016, triple-track threshold |
| Kitchen | Bespoke painted Shaker, Silestone Bianco Calacatta worktops, Neff slide-and-hide appliances |
| UFH | Polypipe wet underfloor heating, 75mm screed, full 55m² footprint, four zones |
| Flat roof | Alumasc Hydrotech hot-melt waterproofing, inverted insulation, SFA paving on pedestals |
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