Project Type
Dormer Loft Conversion
Duration
13 weeks
Project Value
£72,000
The Challenge
The Victorian terrace was within Highgate Conservation Area and Haringey LBC's policy required a Heritage Impact Assessment for the dormer. The original roof structure was a cut rafter type with no ridge board, which required a new ridge beam and purlin system to be installed before the dormer could be formed. The staircase position within the house was constrained — the only viable route required taking space from the third bedroom below.
Our Solution
Our structural engineer designed a new ridge beam and purlin system to be installed in sections through the existing roof coverings, minimising the period of exposure. Our architect produced the Heritage Impact Assessment in two weeks, referencing Haringey's own design guidance. The staircase was designed as a space-saving alternating-tread stair within a minimal footprint, reducing the impact on the bedroom below to a single wardrobe alcove.
Results
- ✓Haringey planning approval with Heritage Impact Assessment accepted
- ✓New ridge beam and purlin system installed in two days
- ✓26m² of loft space created
- ✓Double bedroom with Velux rooflights and treetop views
- ✓En-suite shower room — Hansgrohe Croma shower, Porcelanosa tiles
- ✓Space-saving alternating-tread staircase — minimal impact on bedroom below
- ✓Estimated property value uplift: £110,000
Key Features
- ✓Haringey conservation area planning consent
- ✓Heritage Impact Assessment prepared and accepted
- ✓New ridge and purlin structural system
- ✓Double bedroom with treetop Velux views
- ✓En-suite with thermostatic shower and heated towel rail
- ✓Space-saving alternating-tread staircase
Specification
| Item | Specification |
|---|---|
| Ridge and purlin system | New C24 timber ridge beam and purlins, structural calculations certified |
| Dormer cladding | Zinc standing-seam, pre-weathered graphite, to dormer cheeks and flat roof |
| Rooflights | Velux Conservation GGL 3073, triple-glazed, two units to rear pitch |
| En-suite tiles | Porcelanosa Rodano Caliza, 450×900mm, half-height to main walls, full height to shower |
| Shower fitting | Hansgrohe Croma Select S 180 MultiSync, concealed thermostatic valve, chrome |
| Staircase | Alternating tread oak stair with powder-coated steel string, minimal footprint design |
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