The five formats we build in London, with realistic costs, planning notes and the trade-offs nobody tells you on a sales call.
Indicative only. Final figures depend on your roof, party walls and spec — we confirm everything in writing after a free home visit.
The simplest and cheapest option. Windows are added into the existing roof slope without changing the roof structure much.
A box-shaped extension added to the rear or side roof slope to create extra head height and floor space.
The sloping 'hip' roof side is built vertically to create more loft width.
A major roof reconstruction with a near-vertical rear wall and flat roof.
Two connected dormers forming an 'L' shape over the rear addition roof.
In London, a quality loft conversion can add 15–25% to the property value, plus the bedroom premium and a stronger EPC.
Ideal starting height is 2.2 m+ from the floor joist to the ridge. Below 2.1 m it usually means lowering the ceiling below or raising the ridge — possible, but a different conversation.
Best balance of cost vs. space, works on Victorian terraces, usually the easiest planning route, strong ROI.
