Basement specialistsin Wandsworth ,SW18, SW11, SW17.
Basement excavations, conversions and waterproofing across Wandsworth: Wandsworth Common, Trinity Road, Bellevue Road, Northcote, Nightingale Triangle and the wider borough.
Our own 25-strong team · Free site visit and quote · 25-year warranty.
We know Wandsworth streets, ground and stock.
Wandsworth is one of our densest workload areas. From the Victorian terraces off Bellevue Road and Nightingale Lane to the Edwardian family houses around Wandsworth Common and the mansion blocks along Trinity Road, we've dug, underpinned and waterproofed more than thirty basements inside SW11, SW17 and SW18 alone.
All Wandsworth borough postcodes: SW11, SW12, SW17, SW18, plus SW15 (Putney) and SW19 (Wimbledon Park). Deepest coverage in Wandsworth Common, Northcote, Nightingale Triangle, Southfields and Earlsfield.
Call or email and a director will get back to you to arrange a free site visit at a time that suits you.
Victorian mid-terrace and end-terrace houses, Edwardian family homes, mansion blocks, converted flats, 1930s semis in Southfields, and modern infill developments around the Common.
Full basement excavations for growing families, Type C cavity drainage retrofits on flood-prone terraces, cellar conversions off Bellevue and Balham High Road, and light wells to bring daylight into deep SW18 plans.
Every basement discipline, under one roof.
Every basement discipline UHM offers is delivered across Wandsworth. Each service link below explains the technical detail, materials, warranties and what's included on a typical SW11 / SW17 / SW18 job.
Basement Excavation
New-build basements dug and structurally formed beneath Wandsworth homes, sequenced underpinning designed for London Clay.
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Basement Conversion
Fully habitable Wandsworth lower-ground floors, kitchens, cinemas, guest suites with matched ceiling heights.
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Waterproofing & Tanking
BS 8102 Type C cavity drainage across Wandsworth, Delta Registered, 25-year insurance-backed warranty.
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Underpinning
Structural underpinning to lower Wandsworth Victorian and Edwardian foundations, Temporary Works Coordinator on every job.
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Cellar Conversion
Convert existing Wandsworth cellars into dry, warranted rooms, no dig, minimal disruption.
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Damp Proofing
Diagnostic damp surveys across Wandsworth, targeted damp-proofing, no scattergun tanking.
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Sump & Pump Systems
Twin-pump, alarmed sump systems installed and commissioned across Wandsworth, the mechanical backbone of a dry basement.
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Basement Extension
Downward extensions in Wandsworth where outward extension isn't allowed, full planning and Party Wall service.
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Light Well Installation
Engineered light wells for deep Wandsworth plans: glazing, drainage and edge-protection detailing included.
Learn moreWhy Wandsworth homeowners choose UHM.
Wandsworth homes are largely Victorian and Edwardian, densely packed, on London Clay, with active party walls on both sides. That combination is where cowboy basement contractors get owners in trouble, and where our directly-employed model matters most.
One accountable team, start to finish
Live and recent projects on streets off Wandsworth Common, Trinity Road, Bellevue Road, Nightingale Lane, Northcote Road and around Earlsfield. Every one delivered by our own team.
Wandsworth Council & Party Wall fluent
We handle Wandsworth Council Building Control inspections and Party Wall notices for the tightly-packed SW18 terraces daily. Notices, awards, adjoining-owner surveyor liaison | all in-scope.
Delta Registered on every job
Every waterproofing element is designed to BS 8102 by Delta Registered Installers and backed by a 25-year insurance-backed warranty | the same standard we apply on every Wandsworth project regardless of size.
The specific problems Wandsworth basements face.
Wandsworth's mix of London Clay subsoil, Victorian brick foundations and tightly-packed terraces produces predictable basement failures. Every UHM design engineers them out from day one.
London Clay under most of SW18
Wandsworth sits largely on London Clay | a shrink-swell soil that moves seasonally. Basement retention and underpinning must be sequenced carefully to prevent heave, cracked returns and later door-frame movement in the house above.
High water table near the Wandle & Thames
Properties around the Wandle Valley, Southfields and the Thames end of the borough carry a high water table. Hydrostatic pressure means tanking alone is never enough | we specify Type C cavity drainage with twin, alarmed sump-and-pump as standard.
Party wall density
Almost every Wandsworth terrace shares two party walls. Party Wall Act notices and awards are needed for underpinning and excavations. UHM handles notices and awards start-to-finish so you don't have to project-manage neighbours.
Restricted street access
The tight one-way streets around Nightingale Triangle, Northcote and off Bellevue Road require skip permits, muck-away planning and vehicle-marshalled deliveries. We plan and price this before quoting | no on-site surprises.
Structured stages, no shortcuts.
Every UHM project, whether in Wandsworth or elsewhere in London, runs through the same disciplined sequence. You'll always know what's happening next, who's doing it and when it completes.
- 01
Free Wandsworth site visit
Director-led survey of your SW18 or SW11 property | measured, photographed, condition-noted. No charge, no obligation.
- 02
Fixed written quote
Structural strategy, BS 8102 waterproofing spec and Wandsworth Council planning notes | priced in writing before you commit.
- 03
Consents & Party Wall
Building Control, Party Wall Awards for the terraces off Trinity Road or around the Common | all managed by UHM.
- 04
Build on-site
Directly-employed 25-strong team on your Wandsworth site. Neighbours protected, road frontage tidy, weekly reporting.
- 05
Handover & warranty
Building Control sign-off, twin-pump commissioning, 25-year structural and waterproofing warranties.
Do you serve Wandsworth?
Yes, Wandsworth is one of our densest workload areas. We cover all SW18, SW17, SW11, SW12 and neighbouring postcodes with our directly-employed 25-strong team.
How fast can you reach Wandsworth?
Get in touch by phone or email and we will arrange a free, director-led site visit at a time that suits you.
How much does a basement cost in Wandsworth?
Every Wandsworth quote is written after a real site visit: no public price list is useful because ground, water table, party walls and finish spec dominate the price. We provide a fixed written quote after the free visit.
Do you handle Wandsworth Council Building Control and Party Wall Awards?
Yes. UHM manages Building Control inspections with Wandsworth Council and Party Wall notices, awards and adjoining-owner surveyor liaison as part of the standard scope.
Which Wandsworth streets have you worked on?
We keep client details private, but recent and live projects sit across Wandsworth Common, Trinity Road, Bellevue Road, Nightingale Lane, Northcote Road, and around Earlsfield and Southfields. References available on request under NDA.
Do you cover flats and mansion blocks in Wandsworth?
Yes, where sub-floor structure and freeholder consent allow. Trinity Road and Bellevue-area mansion block cellars are frequent projects, usually cellar conversions rather than full excavations.
Serving South & West London
Book your Wandsworth site visit.
Free, director-led, no pressure. If your Wandsworth basement isn't the right fit for UHM, we'll tell you at the visit, and recommend where to look next.
- Free site visit
- Free written quote
- 25-year warranty
- £10M insurance
- Directly-employed team