Basement conversion in Beckenham

Investigate the structure and ground before design.

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

The council’s Urban Design Guide says the railway turned Beckenham from a small village into a town on the edge of suburbia, and that its period of greatest growth, from 1860 to 1890, swept away most of the old timber-framed houses. Most dwellings are Victorian, with some 1940s and 1950s flats and houses. The town keeps an urban village feel, and the Beckenham Town Centre Conservation Area, designated on 10 June 2015, includes the Parish Church of St George, Grade II*, and the Odeon Cinema and Regal Ballroom, Grade II.

In the Local Plan, the original Edwardian core of the Park Langley garden suburb is a conservation area, designated on 22 October 1989; the rest, built between the 1920s and 1950s, has a garden-estate character given by its hedges, walls, fences and front gardens, and is almost entirely large detached two-storey family houses on generous plots. The North Copers Cope Road ASRC is a mostly Victorian and Edwardian enclave marking the start of the residential part of Copers Cope Road. Copers Cope Conservation Area was designated on 1 December 1998.

Two councils use the name Beckenham Place Park. The park, Lewisham’s largest green space, lies in Lewisham, whose conservation area of that name centres on the Grade II* Beckenham Place mansion and its parkland. In Bromley, Beckenham Place Park is also a private road of mixed character: inter-war and post-war houses at its western end near the listed lodges at the Southend Road entrance, two Victorian houses on its north side in Bromley’s own Beckenham Place Park Conservation Area of August 1993, and St Margaret’s, an original Victorian house among dense trees.

Local design and consent context

An Area of Special Residential Character is a Local Plan designation, separate from a conservation area, and Policy 44 asks development in one to respect, enhance and strengthen its qualities. The Local Plan calls the Park Langley ASRC a coherent, continuous area that has kept its character and unity intact, bounded by Wickham Way, Barnfield Wood Road and Hayes Lane. At 119–169 Copers Cope Road it notes bay windows, ornate pitched wooden porches, decorative brick and plasterwork and hipped slate roofs with chimneys, and that a significant proportion of those front gardens have been paved or tarmacked for parking.

The ASRC directions for Park Langley, North Copers Cope Road, Beckenham Place Park with Foxgrove Avenue and Foxgrove Road, and Sidney Road and Kendal Road each cover Part 1 Class AA, adding storeys to a house, and Part 20 Classes A and AA to AD, new homes on top of existing buildings; Planning Data gives the first three a start date of 15 March 2022. They do not deal with ordinary extensions. Two 2022 directions protect views from Village Way in the same way, on properties shown only on their plans. Separately, a 2022 direction for Beckenham Town Centre, modified by the Secretary of State in September 2023, concerns turning commercial premises into homes.

Older directions apply in two conservation areas. Chancery Lane’s 1984 direction covers new or altered doors and windows, dormers, rendering or cladding brickwork and re-roofing on one part of its land, and hardstandings and gates, fences and walls on another, but not work affecting the rear of buildings; ask the council how it applies today. At Barnmead Road, a 1992 direction covers replacement windows on front and flank elevations, re-roofing and front porches, and a second direction followed in 2000.

Access and site planning

Bromley requires a temporary highway licence for a skip on the public highway, and only a skip company on the council’s register can apply; the licence runs for two weeks. Beckenham Place Park is a private road, and no licence is needed where public access to a private road is restricted or controlled, but an unadopted highway that the public can use still needs one, so check with the road’s owners and the council. Scaffolding or a hoarding on the highway needs consent as well, and parking bay suspensions need at least three working days’ notice.

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

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