07450 310772sales@uhmbasements.co.uk FMB  ·  Delta Registered  ·  £10M Insured  ·  25-Year Warranty About Services Areas Our Work Reviews Contact 07450 310772Book a site visit Basement specialists · Balham SW12 # Basement specialistsin Balham ,SW12 & Nightingale Triangle. Basement excavations, conversions and waterproofing across Balham: Nightingale Triangle, Hyde Farm, Heaver Estate, Ramsden Road and Bedford Hill. Book a free site visit 07450 310772 Our own 25-strong team · Free site visit and quote · 25-year warranty. 150+ Basements excavated 17 yrs Trading since 2009 25 yr Waterproofing warranty £10M Insurance cover Delta Registered installers Local coverage ## 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. Coverage 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. Response time Call or email and a director will get back to you to arrange a free site visit at a time that suits you. Property types 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. Common needs 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. Services in Balham ## 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. Learn more ### Basement Conversion Fully habitable Balham lower-ground floors, kitchens, cinemas, guest suites, matched ceiling heights. Learn more ### Waterproofing & Tanking BS 8102 Type C cavity drainage across Balham, Delta Registered, 25-year insurance-backed warranty. Learn more ### Underpinning Structural underpinning across Balham's Victorian foundations, Temporary Works Coordinator on every job. Learn more ### Cellar Conversion Convert existing Balham cellars into dry, warranted rooms, no dig, minimal disruption. Learn more ### Damp Proofing Diagnostic damp surveys across Balham, targeted damp-proofing, no scattergun tanking. Learn more ### Sump & Pump Systems Twin-pump, alarmed sump systems installed and commissioned across Balham, the mechanical backbone of a dry basement. Learn more ### Basement Extension Downward extensions in Balham where outward extension isn't allowed, full planning and Party Wall service. Learn more ### Light Well Installation Engineered light wells for deep Balham rear plans: glazing, drainage and edge protection included. Learn more Why choose UHM in Balham ## Why 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. Location-specific challenges ## 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. Our process ## 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. Frequently asked ## Real answers for Balham. 07450 310772Message us ### 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. Nearby areas we cover ### Serving South & West London - Clapham - Wandsworth - Wimbledon - Putney - Chelsea - Kensington - Richmond upon Thames - London (all boroughs) Explore services ### Full basement discipline - Basement Excavation - Basement Conversion - Waterproofing & Tanking - Underpinning - Cellar Conversion - Damp Proofing - Sump & Pump Systems - Basement Extension - Light Well Installation Book your free site visit ## 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 teamRequest your free quote 07450 310772 Or return to the homepage · read about UHM. Underhouse Management Ltd, London's structural basement specialists. A directly-employed team of 25, delivering meticulous below-ground work across the capital's finest addresses. Established 2009. FMB·Delta Registered·Considerate Constructors ### Services - Basement Excavation - Basement Conversion - Waterproofing & Tanking - Underpinning - Cellar Conversion - Basement Extension ### Areas Served - London - Wandsworth - Clapham - Wimbledon - Putney - Balham - Chelsea - Kensington - Richmond upon Thames ### Contact - 07450 310772 - sales@uhmbasements.co.uk - Unit C220A, Trident Business Centre,89 Bickersteth Rd, London SW17 9SHBook a site visit © 2026 Underhouse Management Ltd (t/a UHM Basements). Company No. 06968521. Privacy Policy·Terms & Conditions·Cookie Policy·25-year warranty · £10M insurance Call nowBook a site visit