L-shaped loft conversions to Holland Park houses with a rear outrigger — combining a main dormer with a return over the back addition for a larger room.
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An L-shaped conversion takes advantage of a rear outrigger — the back addition or ‘closet wing’ found on many period houses — by adding a dormer over the main roof and a return over the outrigger. The two link to form an L-shaped room with far more floor area than a single dormer.
It only works where the house has that rear back addition, which is common on Victorian and Edwardian houses in and around Holland Park. Because both elements are at the rear, an L-shaped scheme is usually less prominent from the street, which helps in the conservation area — but it still needs planning permission.
We survey both roofs, design the two dormers to read as one considered addition, and engineer the structure, staircase and fire strategy together, in a single design-and-build contract.
The L-shape only exists where there is a rear back addition to build over.
The ‘L’ comes from a return over the back addition — no outrigger, no L-shape.
Both dormers sit at the rear, so the scheme is usually less prominent from the street.
Even at the rear, conservation-area roof changes need a formal application and a careful design.
The main dormer and the return must be engineered and weathered together as a single room.
From surveying both roofs to a finished L-shaped room — under one team.
Measuring the main roof and the outrigger to confirm an L-shaped room works.
Drawings for two rear dormers designed to read as one considered addition.
Steel and floor structure across both roofs, with Building Control.
Framing, roofing and weathering of the main dormer and the return.
A compliant stair positioned to open onto the larger room.
Escape, fire separation and Building Regulations sign-off.
Heating, electrics and insulation to current standards.
Bedroom-with-bathroom or suite fit-out, snagging and handover.
We build L-shaped conversions on Holland Park’s period houses that retain a rear back addition, across the W11 terraces and villas.
Holland Park sits within the Royal Borough of Kensington & Chelsea — see our Holland Park area page and South West London refurbishment overview.
Book a no-obligation consultation at 2 Eaton Gate in SW1, at our Hampstead studio, or at your property. We will give you an honest read on approvals, programme and budget band — in pounds sterling — before you commit.
Site visit · approvals read · outline budget band (GBP) · programme indication. No obligation.
Send Project DetailsThe same NW3 design-build team covers the neighbouring areas: