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 · Chelsea SW3 & SW10 # Basement specialistsin Chelsea ,SW3, SW10 & the Royal Borough. Basement excavations, conversions and waterproofing across Chelsea: Chelsea Green, King's Road, Cheyne Walk, Sloane Square, World's End and the Boltons. 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 ## Chelsea basements are heritage-first, engineering-second. Chelsea basements are unlike anything further south. Georgian and Victorian stucco-fronted townhouses, listed frontages, conservation area controls across almost the entire postcode, Party Wall Awards on both flanks and often across the rear, tight mews access and RBKC's specific basement subterranean development policy, heritage constraints define the project before engineering does. UHM has delivered more than a dozen basements inside SW3 and SW10 in the last decade. Coverage All SW3 and SW10 postcodes and neighbouring SW1 and SW7. Deepest coverage in Chelsea Green, King's Road, Cheyne Walk, Sloane Square edges, the Boltons and World's End. 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 Georgian and Victorian townhouses, stucco-fronted terraces, mews houses, listed buildings, converted mansion flats, and Grade II heritage stock across the RBKC. Common needs Full basement excavations under listed Georgian houses, cellar conversions to habitable rooms, wine-cellar and cinema fit-outs, heritage-appropriate waterproofing retrofits, and light wells engineered inside conservation-area consent constraints. Services in Chelsea ## Every basement discipline, under one roof. Every UHM basement discipline is delivered across Chelsea, adapted for heritage constraints. Each service link below explains the technical detail and warranty position, but on Chelsea projects, the consent programme often exceeds the build programme. ### Basement Excavation New basements dug beneath Chelsea's Georgian and Victorian townhouses, heritage-appropriate sequencing on listed frontages. Learn more ### Basement Conversion Fully habitable Chelsea lower-ground floors, wine cellars, cinemas, spas, matched ceiling heights, listed-interior sympathetic. Learn more ### Waterproofing & Tanking BS 8102 Type C cavity drainage across Chelsea, Delta Registered, 25-year insurance-backed warranty. Learn more ### Underpinning Structural underpinning across Chelsea's Georgian and Victorian foundations, Temporary Works Coordinator on every job. Learn more ### Cellar Conversion Convert existing Chelsea cellars: perfect for wine storage, cinemas and studies inside listed frontages. Learn more ### Damp Proofing Diagnostic damp surveys across Chelsea, targeted damp-proofing sympathetic to listed interior fabric. Learn more ### Sump & Pump Systems Twin-pump, alarmed sump systems installed and commissioned across Chelsea, the mechanical backbone of a dry basement. Learn more ### Basement Extension Downward extensions in Chelsea where outward extension is prohibited, full RBKC planning and Party Wall service. Learn more ### Light Well Installation Engineered light wells for listed Chelsea plans, consent-aware, heritage-appropriate detailing. Learn more Why choose UHM in Chelsea ## Why Chelsea homeowners choose UHM. Chelsea basement projects fail more often on consent and heritage than on engineering. A team that handles heritage sequencing in-house is the single biggest predictor of a project delivered on time and without conservation-officer disputes. ### One accountable team, start to finish Recent and live projects across Chelsea Green, King's Road side streets, Cheyne Walk and the Boltons. Every one delivered by our own 25-strong directly-employed team. ### RBKC-consent fluent We handle RBKC Building Control, conservation area consent, listed building consent and Party Wall Awards routinely. Their subterranean development policy is complex | we plan for it inside the project programme, not after tender. ### Heritage-appropriate methods Underpinning sequences for Grade II stucco frontages, careful façade-load management, and reversible internal detailing on listed interiors | all handled in-house by our own team. Location-specific challenges ## The specific problems Chelsea basements face. Chelsea basements fail predictably: not from ground or water but from heritage, consent, party wall density and RBKC-specific planning policy. Every UHM design programme starts by engineering those risks out. ### Listed façades & stucco fronts Chelsea's Georgian and Victorian townhouses often have listed façades and stucco fronts with settlement-cracked lime render. Underpinning must be sequenced not to lift or drop stucco panels | Temporary Works Coordinator on every heritage job. ### Conservation area & Article 4 controls Almost the entire SW3 postcode is inside conservation areas with Article 4 directions removing permitted development rights. Light wells, external stairs, planting removal | all need consent and lead time. ### RBKC subterranean development policy The Royal Borough operates its own basement policy with specific rules on depth, projection, garden loss and construction management. UHM plans against that policy pre-tender | never trying to retrofit compliance later. ### Party walls on three flanks Chelsea townhouses commonly share flanks and often rears with neighbours. Notices, awards and adjoining-owner surveyor liaison are standard | we manage them all inside the scope. Our process ## Structured stages, no shortcuts. Every UHM project, whether in Chelsea 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 Chelsea site visit Director-led survey of your SW3 or SW10 property | measured, photographed and listed-building noted. - 02 ### Fixed written quote Structural strategy, BS 8102 waterproofing spec and RBKC conservation notes | priced in writing. - 03 ### Consents & Party Wall RBKC Building Control, conservation area consent, listed building consent, Party Wall Awards | managed end to end. - 04 ### Build on-site Directly-employed team on your Chelsea site. Heritage-appropriate methods, protected façades, tight logistics. - 05 ### Handover & warranty Sign-off, twin-pump commissioning, 25-year structural and waterproofing warranties. Frequently asked ## Real answers for Chelsea. 07450 310772Message us ### Do you serve Chelsea? Yes. Chelsea SW3 and SW10 are core UHM areas with completed basement projects across Chelsea Green, King's Road, Cheyne Walk and the Boltons. ### How fast can you reach Chelsea? 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 Chelsea basement cost? Chelsea basements are typically higher-specification and more consent-intensive than the wider South London average, but every quote is written after a real site visit, with heritage constraints priced in transparently. ### Do you handle RBKC Building Control, conservation area consent and listed building consent? Yes. UHM manages Building Control with the Royal Borough of Kensington and Chelsea, plus conservation area consent, listed building consent where required, and Party Wall Awards, all inside the standard scope. ### Can you work on listed buildings in Chelsea? Yes, subject to listed building consent. Listed projects need slower, more careful sequencing and more consent time, we plan for it in the programme, and we won't quote a heritage project until we've seen it. ### How does RBKC's basement policy affect what we can build? The Royal Borough restricts depth, garden loss and specific construction management practices. It does not prevent basements, but it constrains them, UHM will explain what your specific address can and cannot accommodate at the free site visit. Nearby areas we cover ### Serving South & West London - Kensington - Wandsworth - Clapham - Putney - Balham - Richmond upon Thames - Wimbledon - 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 Chelsea site visit. Free, director-led, heritage-aware. On listed and conservation-area Chelsea properties we'll walk the frontage, note constraints, and price the work realistically 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