Single-storey basement extensions to Notting Hill houses — designed within RBKC’s strict basement policy and the area’s sensitive garden-square setting, with the BIA, underpinning and waterproofing in-house.
Speak to the studio directly: 020 8054 8756
A basement extension adds a full new floor without changing the look of the house from the street — one of the few ways to gain serious space in Notting Hill’s protected, tightly-packed streetscape. Done properly it gives a light, dry, fully tanked room for a kitchen, media room, gym or guest suite.
The Royal Borough has one of the strictest basement policies in London, sharpened in this very part of the borough. New basements are generally limited to a single storey, must not extend under more than half of the garden, need at least a metre of soil above any part beneath a garden, and require a Basement Impact Assessment plus a Construction Traffic Management Plan — with communal gardens, mature trees and close neighbours adding further sensitivity.
We design within that policy from the outset, because a non-compliant scheme is simply refused. Engineering, underpinning, waterproofing and the planning case all sit in one design-and-build contract with a single point of responsibility, and honest budgets in pounds sterling.
In Notting Hill, the basement policy and the garden-square setting set what is buildable.
RBKC policy generally limits a new basement to one storey under the house and part of the garden.
A BIA covering structure, ground movement and groundwater is required; we commission and coordinate it.
No more than half the garden, with a metre of soil above — and communal gardens add sensitivity.
A Construction Traffic Management Plan and method statements govern the work on a tight site.
From feasibility against RBKC policy to a dry, finished basement — all in-house.
Testing the site against RBKC basement policy before any design work begins.
Commissioning the Basement Impact Assessment, structural method and CTMP.
Drawings and a planning case for a compliant single-storey basement.
Sequential, engineer-designed underpinning to form the new depth safely.
Retaining structure, propping and party wall awards with neighbours.
Type C cavity-drain or tanked systems with pumps and a maintainable design.
Lightwells, sun-pipes and mechanical ventilation to make the room usable.
Kitchen, gym, media or guest-suite fit-out, snagging and handover.
We design and build single-storey basements within RBKC policy across Notting Hill’s terraces and villas in W11.
Notting Hill sits within the Royal Borough of Kensington & Chelsea — see our Notting Hill 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.
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