Double-storey rear extensions to Holland Park houses — adding space on two floors, designed sensitively for the conservation area, with structure, party wall and build under one team.
Speak to the studio directly: 020 8054 8756
A double-storey rear extension adds rooms on two levels in a single build — typically a larger kitchen-dining room below and a bedroom or bathroom above. For a Holland Park family that needs real additional space, it is far more efficient than two separate projects, but it is also more visible and more sensitive than a single-storey scheme.
Massing is everything in a conservation area. A two-storey addition is read against the original house and the neighbours, so RBKC will scrutinise its height, depth and effect on daylight and outlook. The design has to feel subordinate and proportionate, not like a second house bolted on the back.
We design the extension to sit comfortably with the original building, make the planning case, engineer the structure and the larger openings, manage the party wall, and build it across both floors — one contract, one responsible team.
A two-storey extension is judged on massing — height, proportion and impact on neighbours.
Two storeys are more visible than one, so the conservation-area case must be made with care.
The addition has to read as proportionate and secondary to the original house.
RBKC weighs the effect on neighbours’ daylight and outlook over two floors.
Larger openings and loads over two storeys need proper engineering and party wall awards.
From a sensitive, consentable design to a finished two-storey addition — under one team.
Designing a two-storey extension proportionate to the house and the conservation area.
A planning application and heritage-led case on massing and impact.
Foundations, steel and openings across two floors, with Building Control.
Notices and awards on the shared walls of the terrace.
Two-storey structure, roof and weathering to current standards.
Heating, plumbing and electrics across the new rooms.
Kitchen, bedroom or bathroom fit-out, flooring and decoration.
Two-stage snagging and a clean handover.
We design and build double-storey rear extensions on Holland Park’s period houses across W11, massed to suit the conservation area.
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: