Basement specialistsin Richmond upon Thames ,TW9, TW10 & the riverside.
Basement excavations, conversions and waterproofing across Richmond upon Thames: Richmond Hill, Richmond Green, Kew, Ham, Petersham and Twickenham.
Our own 25-strong team · Free site visit and quote · 25-year warranty.
Richmond basements are river engineering, not standard basements.
Richmond upon Thames sits along one of the highest-flood-risk stretches of the tidal Thames in London. High and rising water tables, Environment Agency flood zones covering large parts of Richmond Hill, Petersham and Ham, and conservation area controls across Richmond Green and Kew mean any basement here has to be designed as river engineering first and interior design second. UHM has completed more than ten basements across TW9 and TW10 in the last decade.
All TW9 and TW10 postcodes and adjoining TW1, TW2 and SW14. Deepest coverage in Richmond Hill, Richmond Green, Petersham, Ham, Kew and the Twickenham borders.
Call or email and a director will get back to you to arrange a free site visit at a time that suits you.
Georgian and Regency townhouses on Richmond Hill, Edwardian family homes near Kew Gardens, Victorian terraces around Richmond Green, mansion blocks on the Vineyard and larger detached houses in Petersham and Ham.
Flood-response waterproofing and pump upgrades for riverside cellars, full basement excavations under Georgian and Edwardian family homes, heritage-appropriate waterproofing retrofits, and light wells engineered inside conservation-area consent constraints.
Every basement discipline, under one roof.
Every UHM basement discipline is delivered across Richmond, adapted for flood-zone waterproofing and heritage constraints. Each service link below explains the technical detail on a typical TW9 or TW10 job.
Basement Excavation
New basements beneath Richmond homes, retention and dewatering designed for tidal Thames water tables.
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Basement Conversion
Fully habitable Richmond lower-ground floors, kitchens, cinemas, guest suites, matched ceiling heights.
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Waterproofing & Tanking
BS 8102 Type C cavity drainage, critical in flood-zone Richmond, backed by our 25-year insurance-backed warranty.
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Underpinning
Structural underpinning across Richmond's Georgian, Victorian and Edwardian foundations, Temporary Works Coordinator on every job.
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Cellar Conversion
Convert existing Richmond cellars into dry, warranted rooms, flood-zone-aware waterproofing throughout.
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Damp Proofing
Diagnostic damp surveys across Richmond, targeted damp-proofing, not scattergun tanking.
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Sump & Pump Systems
Twin-pump, alarmed sump systems installed and commissioned across Richmond, sized for flood-zone rating.
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Basement Extension
Downward extensions in Richmond where outward extension is restricted, full planning and Party Wall service.
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Light Well Installation
Engineered light wells for deep Richmond plans, consent-aware, flood-zone-appropriate detailing.
Learn moreWhy Richmond homeowners choose UHM.
Richmond basements are the least forgiving in our footprint: riverside water tables, flood-zone consent implications and heritage constraints all at once. Directly-employed installers, insurance-backed 25-year warranties and full in-house consent capability aren't luxuries here; they're the baseline.
One accountable team, start to finish
Recent and live projects across Richmond Hill, Richmond Green, Kew and Ham. Every one delivered by our 25-strong directly-employed team.
Flood-zone waterproofing capability
Every TW9 and TW10 basement is designed to BS 8102 with Type C cavity drainage and twin-pump, alarmed sump systems as standard | with pump redundancy sized for the actual EA flood-zone rating on your address.
25-year warranty on riverside jobs
Even on Environment Agency flood-zone properties, our 25-year structural and waterproofing warranties apply | insurance-backed by £10M public liability. That warranty is only credible with our own team on site.
The specific problems Richmond basements face.
Richmond basements are dominated by three risks: flood-zone water tables, tidal Thames hydrostatic pressure, and conservation controls. Every UHM design engineers them out from day one.
Environment Agency flood zones
Large parts of TW9 and TW10 fall inside Environment Agency flood zones 2 and 3. That does not prevent basement work but it changes waterproofing spec, pump redundancy, Building Control conversations and | sometimes | planning consent. UHM manages it up front.
Tidal Thames water table
Groundwater across riverside Richmond rises and falls with the tidal Thames. Basements here need continuous mechanical dewatering | twin-pump, alarmed sump systems | not passive tanking alone. This is the specification UHM applies as standard, not as an upsell.
Conservation areas across Richmond Green & Hill
Much of Richmond Green, Richmond Hill and Kew is inside conservation areas with Article 4 directions. Light wells, external stairs and any external alteration need consent and lead time. We plan and secure it before starting on site.
Listed heritage stock
Georgian townhouses on Richmond Hill, listed properties on the Vineyard and heritage cottages in Petersham need listed building consent for internal alterations affecting historic fabric. UHM plans that consent time into the programme up front.
Structured stages, no shortcuts.
Every UHM project, whether in Richmond upon Thames 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 Richmond site visit
Director-led survey of your TW9 or TW10 property | measured, photographed and flood-zone noted.
- 02
Fixed written quote
Structural strategy, Type C waterproofing spec and Richmond Council planning notes | priced in writing.
- 03
Consents & Party Wall
Richmond Building Control, conservation area consent, Party Wall Awards | all managed by UHM.
- 04
Build on-site
Directly-employed team on your Richmond site with river-aware dewatering and pump strategy.
- 05
Handover & warranty
Sign-off, twin-pump commissioning, 25-year structural and waterproofing warranties.
Do you serve Richmond upon Thames?
Yes. Richmond TW9 and TW10 are core UHM areas with completed basement projects across Richmond Hill, Richmond Green, Kew and Ham.
How fast can you reach Richmond?
Get in touch by phone or email and we will arrange a free, director-led site visit at a time that suits you.
Can basements be built safely in Richmond's flood zones?
Yes: provided waterproofing, dewatering and pump strategy are designed for flood-zone-rated water tables from day one. That is exactly how UHM designs every riverside basement, backed by our 25-year insurance-backed warranty.
How much does a Richmond basement cost?
Every Richmond quote is written after a real site visit. Flood-zone waterproofing, dewatering, pump redundancy and heritage consent all affect cost more here than further inland, we price it all in writing before you commit.
Do you handle Richmond Council Building Control, conservation area consent and Party Wall Awards?
Yes. UHM manages Richmond Council Building Control, conservation area consent, listed building consent where required, and Party Wall Awards as part of the standard scope.
Do you work in Environment Agency flood zone 3 in Richmond?
Yes, subject to design-appropriate waterproofing, pump redundancy and Building Control conversation. We'll flag any flood-zone implications at the free site visit before we quote.
Serving South & West London
Full basement discipline
Book your Richmond site visit.
Free, director-led, riverside-aware. On flood-zone and listed Richmond addresses we'll walk the site, note constraints, and price the work realistically in writing.
- Free site visit
- Free written quote
- 25-year warranty
- £10M insurance
- Directly-employed team