5,500 sq ft Knockdown Rebuild on a Private Estate in London Northwood, North West
Marshall Construction delivered a full knockdown and rebuild of a five-bedroom property and detached garage on a prestigious private estate in Northwood, North West London. The original structure was suffering from significant subsidence and required complete demolition before construction could begin. The result is a 5,500 sq ft, three-storey luxury home with an anticipated market value of £3.5 million.
FLOOR AREA
5,500 sq ft
PHASES
2 Planned Phases
DURATION
18 months
Completed
End of 2024
UFH COVERAGE
250+ sq m
ENERGY
Solar PV + Battery
Groundworks and Structural Delivery
The Northwood project began with Phase One: full demolition, site clearance and the installation of extensive groundworks. The site sat on clay, requiring a piled foundation system with ring beams, piling mats and a full replacement drainage network designed to serve the new home. New gas and electric mains were also installed as part of the infrastructure upgrade.
Where possible, materials from the original house were reused – most notably salvaged bricks, which were incorporated into the new extension elements. This added a layer of sustainability to the build and preserved a tangible connection to the property’s original structure.
Build Process
Marshall Construction built a 5,500 sq ft traditional-style home spread over three floors. The building features blockwork construction with a rendered exterior, alongside a steel-framed, hand-cut timber roof structure. Underfloor heating was installed across all three levels for modern comfort throughout.
Phase One concluded at full first-fix stage, with temporary stairs and handrails installed, screeds completed, and first-fix plumbing and electrics in place. The client’s development strategy meant the project was delivered in planned phases, with a six-month pause between Phase One and Phase Two, and a further three-month pause before Phase Three commenced.
Internal Completion and External Works
Phase Three involved full interior finishing — plastering, tiling, second-fix electrical and plumbing, and installation of all bathrooms. The client supplied their own kitchen, which Marshall Construction installed as part of the fit-out.
Throughout the final phase we also managed several client-appointed contractors, including the landscaping team, ensuring coordination and quality control across the entirety of the works.
Outcome
After approximately 18–24 months — including planned phased breaks — the Northwood knockdown rebuild is now fully completed. The result is a meticulously built, high-specification family home shortly to be brought to market with an anticipated value of £3.5 million.
Our client is thrilled with the final outcome and is already exploring future joint ventures and new development opportunities with Marshall Construction.
Considering a knockdown rebuild or luxury new build ?
Considering a knockdown rebuild or luxury new build in Northwood, Pinner, Ruislip or wider North West London? Speak to Marshall Construction.