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RefusedP/2025/1851Submitted over a year agoAnnexe

16 Holly Road Hounslow TW3 1UN

Certificate of lawfulness for the proposed use of the existing detached outbuilding in the rear garden into a residential annexe.

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Map of the site

Progress

Submitted
20 Jun 2025
— completed
Validated
20 Jun 2025
— completed
Consultation
20 Jun 2025
— completed
Target date
8 Sept 2025
— completed
Decided
8 Sept 2025
— completed

Application details

Reference
P/2025/1851
Local authority
Hounslow
Postcode
TW3 1UN
Ward
Hounslow Central
Application type
All Other
Property type
House

Key dates

Submitted
20 Jun 2025
Validated
20 Jun 2025
Comments close
20 Jun 2025
Target decision
8 Sept 2025
Decided
8 Sept 2025

Estimated project value

£34k–£57k

Based on the 15.0m² of floor area stated in the application, at outer London rates (2026). Source: trade estimate, annexe £1,800-£3,000/m².

Floor area gained: 15m² · 1 additional bedrooms

Recently sold nearby

Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 3 recent sales are listed below.

Homes here go for about £410,000 — the median of the last 7 market sales in TW3 1UN, £357,000 to £450,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

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