Basement conversion in Kensal Rise

Investigate the structure and ground before design.

Discuss your project

Start with the basement conversion brief

Distinguish an existing cellar conversion from excavation for a new basement. Record levels, drainage, access and the adjoining structures, and obtain project-specific ground and structural investigations before relying on a design or budget.

Plan temporary works, waterproofing, ventilation, escape and spoil removal as part of the same brief. Ask Hampstead Chartered Surveyors to assess party-wall matters and Hampstead Architecture & Planning to coordinate the design requirements. An area name alone does not establish ground conditions.

The local building context

Chamberlayne Road was laid out from 1893 and reached the railway station by 1895. The appraisal describes continuous parades of Victorian shops along it, with Kensal Rise Station and the Station Terrace public realm at the heart of the conservation area. The parades at 47–65, 67–83 and 85–101 have homes on their upper floors; their roofscape is generally well preserved, with natural slate roofs and tall chimneys, and two- and three-storey rear outriggers remain prominent. The Edwardian parade at 103–119 dates from 1912, and Keslake Mansions on Station Terrace was built between 1898 and 1900.

Clifford Gardens, built in 1896 by Charles Langler and Charles Pinkham, is in the appraisal’s view the finest surviving residential street off Chamberlayne Road, and it calls the street unique in Brent because the whole of it carries decorative plaster pargeting to the gables. The houses look semi-detached but are joined in terraces of twelve, in London stock brick with red brick dressings and double-height bays; the original timber sashes had an upper sash half the size of the lower. Despite lost original windows and a few large rear dormers, the original form survives.

On Chamberlayne Road, the terraces at 130–192 and 127–161 are substantial late Victorian houses, also by Langler and Pinkham and identical to houses on Harvist Road in the Queen’s Park Conservation Area. They are brown brick with red brick dressings, built in symmetrical pairs, with chimneys that keep their clay pots and Welsh slate roofs running back over wide outriggers. Brent left the surrounding streets out of the conservation area as lacking significant merit or too altered, among them Hazel Road and Purves Road, built around 1900 by Edward Vigers and other local builders.

Local design and consent context

Brent’s Cabinet designated the Kensal Rise Conservation Area on 28 May 2024, one of the borough’s 22, and the same day adopted its character appraisal as a supplementary planning document, making it a material consideration in planning decisions. Historic England supported the designation, describing the townscape as a surprisingly complete collection of Victorian and Edwardian buildings. Brent lists an appraisal, a map and a non-immediate Article 4 direction for the area, but no design guide.

Where its plan takes in a house, the direction removes the householder rights to enlarge, improve or otherwise alter it, apart from single-storey rear extensions kept within the original side walls, and the rights for other roof alterations, porches, outbuildings, hard surfaces between the front or side of the house and a highway, and chimneys and flues. It also removes the rights for gates, fences and walls on street frontages, the demolition of gates, fences and walls, means of access to a highway, exterior painting other than entrance doors, window frames and sills and British Standard white or off-white on existing render, and solar equipment except on rear roof slopes, water source heat pumps and wind turbines.

Brent’s Residential Extensions and Alterations SPD was adopted on 16 January 2025 and, like its other supplementary planning documents, is a material consideration; it is not intended for properties in conservation areas or listed buildings, where Brent’s Principal Heritage Officer can advise. The Basement SPD, adopted in June 2017, says basement work in a conservation area, or to a flat, needs planning permission.

Access and site planning

Brent recommends limiting noisy building or demolition work to 8am to 6pm, Monday to Friday, and 8am to 1pm on Saturday, with none on Sundays or bank holidays, and says it may take enforcement action against builders who work outside those hours. It also suggests letting neighbours know beforehand when the work will happen and how long it will take. A lease or building manager may set stricter rules; above a shop, agree deliveries, protection of the shared entrance and any water shut-off before work begins, and decide which rooms stay usable if you live in.

Continue planning

The Kensal Rise area guide · Basement conversion across London · Hampstead Architecture & Planning · Hampstead Chartered Surveyors

Discuss your project

Tell us what you are planning in Kensal Rise

Share the property location, the work you have in mind and any drawings or permissions you already have.

£5M public liability, £10M employers’ liability and contractors’ all risks cover.

Design support: Hampstead Architecture & Planning.
Surveying support: Hampstead Chartered Surveyors.

Your details will be used to respond to your enquiry. Read our privacy policy.