UB postcode locations
UB Postcode Area: Damp, Mould & Leak Detection by District
11 districts from UB1 to UB11. Each district below links to the local pages and the council page that cover it.
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The UB postcode area
The UB postcode area is named after Uxbridge and covers the London Borough of Hillingdon (Uxbridge, Hayes, West Drayton, Northolt, Hillingdon, Ickenham, Yiewsley) and the west of Ealing, including Southall and Greenford, with UB9 reaching Denham in Buckinghamshire. It lies between the HA area to the north and the TW area and Heathrow to the south.
Southall, Hayes and Greenford are mainly inter-war semis and terraces, many extended more than once; Uxbridge, Ickenham and Hillingdon add 1930s detached houses; Northolt and Yeading add post-war estates. Flat-roofed extensions, loft conversions and replaced bathrooms on older plumbing are where many of the leaks we trace in UB start.
Each district below links to the places inside it, with the borough page named on the row.
How the UB districts fall by council. In our directory Hillingdon has places in UB3 to UB4 and UB7 to UB11; Ealing in UB1 to UB2 and UB5 to UB6, all of them in Greater London. Royal Mail post towns across the area: Southall, Hayes, Northolt, Greenford, West Drayton, Uxbridge.
Housing in Hillingdon and Ealing (Census 2021), the main council areas for UB postcodes in our directory: 242,885 households; 51% owner-occupied, 31% privately rented and 17% socially rented. 31% of homes are purpose-built flats, 10% are flats in converted houses or other buildings, 22% terraced houses, 28% semi-detached and 9% detached.Source: ONS Census 2021, tables TS054 (tenure) and TS044 (accommodation type), via Nomis.
Districts UB1 to UB11
UB1: Southall
Council area: Ealing.
Also covered: Southall.
UB2: Southall
Council area: Ealing.
Also covered: Southall, Norwood Green.
UB3: Hayes
Council area: Hillingdon.
Also covered: Hayes, Harlington.
UB4: Hayes
Council area: Hillingdon.
Also covered: Hayes, Yeading.
UB5: Northolt
Council area: Ealing.
Also covered: Northolt.
UB6: Greenford
Council area: Ealing.
Also covered: Greenford, Perivale.
UB7: West Drayton
Council area: Hillingdon.
Also covered: Harmondsworth, Longford, Sipson, West Drayton, Yiewsley.
UB8: Uxbridge
Council area: Hillingdon.
Also covered: Cowley, Uxbridge.
UB9: Uxbridge
Council area: Hillingdon / Buckinghamshire.
Also covered: Harefield.
UB10: Uxbridge
Council area: Hillingdon.
Also covered: Ickenham.
UB11: Uxbridge
Council area: Hillingdon.
Covered from the council page above.
UB18 is a non-geographic code used for business and PO-box mail, with no street addresses, so there is no local page.
Part of our London coverage. All postcode areas · All locations
Real investigations by our team
Examples from DML investigations across our service area. Our own photographs, not stock imagery.
What we do across the UB postcode area
The evidence comes first; the quote for remedial work follows the report, never the other way round. All services →
Insurance-ready reports
A report that answers the adjuster’s questions before they are asked: cause, route, extent, evidence.
Mould treatment & investigation
Investigation first, then treatment of the affected surfaces and a written record for landlords and tenants.
Moisture mapping & thermal imaging
Seeing through the finish: temperature and moisture patterns that reveal what is happening behind plaster and under floors.
CCTV drainage surveys
Camera surveys that find blockages, collapses and leaking joints that feed damp into a property.
Book a damp, mould or leak investigation in the UB postcode area
Our team takes the details, confirms what the visit will cover and books an engineer. Live leaks go to the front of the queue.
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Arrange an investigation in the UB postcode area
The form suits anything that can wait for a call back: a stain, recurring mould, a survey before a purchase. Active leaks: call 0800 054 1524.
Answers for customers in the UB postcode area
Do you report to freeholders and managing agents for blocks in the UB postcode area?
Regularly. For flats and blocks we identify whether the source is a private pipe, a communal service or the fabric of the building, and write it up so the freeholder, agent and insurers can allocate responsibility.
Can you work with my insurer for a property in the UB postcode area?
We provide the trace-and-access evidence and the insurance-ready report; the claim itself is between you and your insurer. We will explain what the adjuster is likely to ask for.
Do you treat mould as well as find the cause in the UB postcode area?
Yes. Investigation and cause first, then treatment of the affected surfaces and the repair of the source, quoted separately and carried out or managed by our team.
Last reviewed: 27 October 2026. Independent investigation and written reports. Repairs are quoted separately.