Basement specialistsin Balham ,SW12 & Nightingale Triangle.
Basement excavations, conversions and waterproofing across Balham: Nightingale Triangle, Hyde Farm, Heaver Estate, Ramsden Road and Bedford Hill.
Our own 25-strong team · Free site visit and quote · 25-year warranty.
Balham terraces are our home ground.
Balham's Victorian terraces, three and four-storey brick homes with original cellars, standing shoulder-to-shoulder from Nightingale Lane to Bedford Hill, are exactly the housing stock UHM has spent seventeen years learning to work inside.
All SW12 postcodes and adjoining SW17, SW11 and SW4. Deepest coverage in the Nightingale Triangle, Hyde Farm Estate, Heaver Estate, Ramsden Road, Bedford Hill and the streets north off Balham High Road.
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 family homes, converted flats over Balham High Road shops, Edwardian mansion blocks around the Common, and modern loft-conversion additions to older terraces.
Full basement excavations for kitchen-diners under four-bed terraces, cellar conversions for utility and guest rooms, Type C cavity drainage on damp older cellars, and light wells to open up dark rear rooms.
Every basement discipline, under one roof.
Every UHM basement discipline is delivered across Balham. Each service link below explains the technical detail and warranty position on a typical SW12 job.
Basement Excavation
New basements dug and structurally formed beneath Balham terraces, sequenced underpinning for Victorian brick.
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Basement Conversion
Fully habitable Balham lower-ground floors, kitchens, cinemas, guest suites, matched ceiling heights.
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Waterproofing & Tanking
BS 8102 Type C cavity drainage across Balham, Delta Registered, 25-year insurance-backed warranty.
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Underpinning
Structural underpinning across Balham's Victorian foundations, Temporary Works Coordinator on every job.
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Cellar Conversion
Convert existing Balham cellars into dry, warranted rooms, no dig, minimal disruption.
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Damp Proofing
Diagnostic damp surveys across Balham, targeted damp-proofing, no scattergun tanking.
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Sump & Pump Systems
Twin-pump, alarmed sump systems installed and commissioned across Balham, the mechanical backbone of a dry basement.
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Basement Extension
Downward extensions in Balham where outward extension isn't allowed, full planning and Party Wall service.
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Light Well Installation
Engineered light wells for deep Balham rear plans: glazing, drainage and edge protection included.
Learn moreWhy Balham homeowners choose UHM.
Balham's density and Victorian brick stock mean the same rules apply as Clapham and Wandsworth: active party walls, London Clay, and no room for undisciplined site management. A directly-employed team is the single biggest difference on a Balham street.
One accountable team, start to finish
Live and recent projects across Nightingale Triangle, Hyde Farm, Heaver Estate and Ramsden Road. Every one delivered by our own team.
Party Wall fluent in SW12
Almost every Balham mid-terrace is party-wall notifiable on two flanks. UHM handles notices, awards and adjoining-owner liaison as part of the standard scope.
25-year warranty, £10M insurance
Every Balham basement is designed to BS 8102 by Delta Registered Installers and backed by our 25-year insurance-backed structural and waterproofing warranties.
The specific problems Balham basements face.
Balham's Victorian brick, London Clay subsoil and dense terrace layout produce the same predictable failure modes we've engineered out of Clapham and Wandsworth basements for the last decade.
Shallow Victorian brick footings
Balham's terraces sit on shallow lime-mortared Victorian brick footings, never designed for a lower-ground floor. Underpinning has to be sequenced hit-and-miss with Temporary Works Coordinator sign-off, or the house cracks.
London Clay shrink-swell
SW12 sits on London Clay. Seasonal shrink-swell movement causes door-frame drift, cracked returns and floor movement if excavation, waterproofing and cure are not sequenced properly.
Two flanking party walls
Almost every Balham mid-terrace is notifiable on both flanks under the Party Wall etc. Act 1996. Notices, awards and schedules of condition are UHM standard scope.
Restricted street parking & access
Ramsden Road, Bedford Hill and the Nightingale Triangle streets have tight parking bays and controlled parking zones. Skip permits, vehicle marshals and muck-away logistics are priced before we quote.
Structured stages, no shortcuts.
Every UHM project, whether in Balham 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 Balham site visit
Director-led survey of your SW12 property | measured, photographed, condition-noted.
- 02
Fixed written quote
Structural strategy, Type C waterproofing spec and Wandsworth Council planning notes | priced in writing.
- 03
Consents & Party Wall
Building Control, Party Wall Awards for Balham's dense terraces | all managed by UHM.
- 04
Build on-site
Directly-employed team on your Balham site. Neighbours protected, weekly reporting.
- 05
Handover & warranty
Sign-off, twin-pump commissioning, 25-year structural and waterproofing warranties.
Do you serve Balham?
Yes. Balham SW12 is a core UHM area with completed basement projects across the Nightingale Triangle, Hyde Farm, Heaver Estate and around Bedford Hill.
How fast can you reach Balham?
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 Balham basement cost?
Every Balham quote is written after a real site visit. Ground, party walls and finish specification dominate cost too much for a public price list to be useful.
Do you handle Wandsworth Council Building Control and Party Wall Awards in Balham?
Yes. UHM manages Building Control inspections and Party Wall notices, awards and adjoining-owner surveyor liaison as part of the standard scope.
How disruptive is a Balham basement dig for neighbours?
Disruptive, honestly, but manageable. Schedules of condition on both flanks, dust screens, protected pavement access and vehicle marshalling are standard operating procedure on every UHM SW12 site.
Can you convert Balham cellars without digging?
Yes. Where an existing cellar has enough head-height, a cellar conversion: waterproofing, insulation, floor, ceiling, first-fix and finishes, can deliver a habitable room without excavation. Most SW12 cellars qualify.
Serving South & West London
Book your Balham site visit.
Free, director-led and no pressure. Balham streets we know house-by-house, we'll walk yours and price the work in writing.
- Free site visit
- Free written quote
- 25-year warranty
- £10M insurance
- Directly-employed team