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We design and build Wimbledon basement conversions with basement excavation, cellar conversion, and underpinning for properties on Parkside, The Ridgway, Lingfield Road - structural engineering, party wall coordination, underpinning, waterproofing, drainage pumps, lightwells and full interior fit-out for period homes, townhouses and prime London properties where ground conditions, neighbour risk and sequencing need handling properly.
Every basement conversion project in Wimbledon is designed to respect the Wimbledon Village Conservation Area and the character of Victorian villas, Arts & Crafts houses, Wimbledon Village period terraces, mansion flats. Our in-house RIBA Chartered Architects handle Merton planning applications, our chartered structural engineers specify any load-bearing work, and our directly-employed trades deliver the build under one fixed-price contract. We coordinate Building Control, Party Wall awards where needed, and all certifications through to handover.
Wimbledon has conservation area coverage in parts, so some properties will need planning permission for external changes while others may proceed under permitted development. We assess each property individually.
Our basement conversion projects in Wimbledon are delivered by our in-house team of RIBA architects, structural engineers and specialist tradespeople. Every project is managed under a single fixed-price contract with no hidden costs.
Wimbledon comes to basement work with an advantage many inner-London areas lack: space. Its Victorian villas, Arts & Crafts houses and Village homes are substantial family housing, and Merton's larger plots make extensions and basements common. Grand detached homes on Arthur Road and Parkside have the ground around them for a lower-ground level, while The Ridgway and Lingfield Road carry the substantial Village houses that suit whole-house refurbishment with a basement folded in. The Arts & Crafts homes need their timber and brick detail handled with conservation care.
Consent runs through the London Borough of Merton, whose conservation-area list carries seven Wimbledon designations — Village, North, West, Broadway, Chase, Hill Road and Windmill — each with a published map and several with design guides. The Wimbledon Village Conservation Area, designated in 1968 and extended in 2007, protects the historic streets above the common. Budgets are shaped by house structure, facade and window decisions, leasehold approvals in flats, party walls and access.
On cost, converting existing space runs £750–£3,000 per square metre (over £6,000 finished); a new dig with underpinning is £2,100–£4,000 per square metre before fit-out.
Wimbledon sits in the London Borough of Merton, with the Wimbledon Village conservation area protecting the historic streets above the common. The Wimbledon Village Conservation Area was designated in 1968 and extended on 12 July 2007, and covers 7.25 hectares (17.92 acres). Wimbledon Village was originally part of the larger Wimbledon Conservation Area, designated in 1968 and extended in 1976 and 1986, which was then subdivided because of its size and varied character into a tight boundary around the commercial area of Wimbledon Village and the two residential areas of Wimbledon North and Wimbledon West.
Merton's conservation area list includes seven Wimbledon designations - Wimbledon Village, Wimbledon North, Wimbledon West, Wimbledon Broadway, Wimbledon Chase, Wimbledon Hill Road and Wimbledon Windmill - each with a published map, and several with adopted character assessments and design guides.
Sources: Merton Council, West Wimbledon Conservation Area Character Assessment (2004) + Wimbledon Village CA design guide (1996) and CA map (2026); Merton Council, Wimbledon Village Conservation Area map (2026); Merton Council, Wimbledon Village Conservation Area Design Guide (March 1996) (2026); Merton Council, List of conservation areas (2026)
Digging out a basement adds a complete new storey without touching the garden or the street elevation — and it is the most engineering-led work we do. Ground conditions, foundation depths and the water table are investigated before a price is ever fixed, because below-ground surprises are expensive precisely when they are unplanned. Each project moves through four disciplines, delivered by one team under one contract.
Below-ground work punishes improvisation, so every stage is closed out before the next one starts.
On site, expect 12–16 weeks for a cellar conversion and 16–24 weeks for a full dig-down — the curing time between underpinning sections cannot safely be compressed. Read the full basement conversion guide for waterproofing systems, ceiling heights and light-well design in depth.
The regulatory load is real: a chartered structural engineer must design and certify the underpinning methodology, and most excavations within three metres of a neighbouring building engage the Party Wall etc. Act 1996 — notices, schedules of condition and often a formal award before work can start. Many boroughs add a Basement Impact Assessment covering hydrology and construction management. Our planning guide library sets out what applies where.
Basements fail when design, engineering and waterproofing are handled by separate firms working from different assumptions. Here they sit under one roof: in-house RIBA Chartered Architects shape the space, our own structural engineers design and supervise the underpinning, and RICS surveying support through our sister company covers party wall and condition matters. Every project carries £10M professional indemnity and public liability cover, a genuinely fixed price agreed after ground investigation, and a 10-year structural and waterproofing warranty. Send an enquiry before 2pm on a weekday and you will hear back from us that same day.
Many are, because the plots are large. Wimbledon's Victorian villas, Arts & Crafts houses and Village homes are prime family housing, much of it substantial, and Merton's larger plots make extensions and basements common here. Grand detached homes on Arthur Road and Parkside, in particular, have the ground around them to take a lower-ground level in a way the tighter inner-London terraces rarely do.
Seven carry the Wimbledon name. Merton's list includes Wimbledon Village, Wimbledon North, Wimbledon West, Wimbledon Broadway, Wimbledon Chase, Wimbledon Hill Road and Wimbledon Windmill, each with a published map and several with adopted character assessments and design guides. The Wimbledon Village Conservation Area, designated in 1968 and extended in 2007, protects the historic streets above the common, so the relevant designation shapes how a basement is judged.
The large Village and common-side houses. The Ridgway and Lingfield Road carry substantial Victorian and Arts & Crafts houses in the Village; Arthur Road climbs past grand detached homes towards the common; and Parkside brings some of the largest houses and mansion flats facing Wimbledon Common. Those large Village houses suit whole-house refurbishment with a basement folded in, while the Arts & Crafts homes need their rich timber and brick detail handled with conservation care.
The structural route decides it. Converting existing below-ground space is guided at £750–£3,000 per square metre of converted area, and above £6,000 per square metre once fully finished. A new excavation with underpinning is the larger figure — £2,100–£4,000 per square metre of dug area, before the fit-out. On the substantial Village houses, the scale of the scheme and the conservation detailing above both feed into the total.
The mix of large houses and lease-controlled flats. Budgets here are shaped by terrace or house structure, facade and window decisions, leasehold approvals, acoustic upgrades in flats, roof, rear or basement interfaces, party walls and access. The large houses give scope but ask for conservation-grade work above the dig; the mansion flats are leasehold projects where structure, acoustics and freeholder consents sit alongside the finish.
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We survey your property, discuss your vision and provide a clear budget framework.