21 Thornfield Avenue London Borough of Barnet NW7 1LT
Single storey rear extension following demolition of the detached garage, and enlargement of raised patio [AMENDED DESCRIPTION].
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Progress
Application details
- Reference
- 20/3537/HSE
- Local authority
- Barnet
- Postcode
- NW7 1LT
- Ward
- FC
- Application type
- Householder
- Property type
- House
Key dates
- Submitted
- 3 Aug 2020
- Validated
- 3 Aug 2020
- Target decision
- 28 Sept 2020
- Decided
- 12 Oct 2020
Estimated project value
£41k–£75k
Typical UK cost for this job type, at inner London rates (2026). Estimated from the proposal description — planning applications do not state build cost. Source: MyJobQuote / Checkatrade 2026, ~20m² at £1,800-£3,000/m².
Recently sold nearby
Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts.
- 25 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £1,300,00012 months ago16 Oct 2025
- 15 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £857,5003 years ago26 Apr 2023
- 5 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £690,0008 years ago21 Aug 2018
- 7 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £905,00010 years ago9 Sept 2016
- 7 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £541,10012 years ago12 Sept 2014
- 23 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £472,50015 years ago30 Sept 2011
- 25 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £475,00015 years ago22 Jul 2011
- 13 THORNFIELD AVENUE, LONDON, NW7 1LTSemi-detached · £380,00015 years ago9 Nov 2010
Homes here go for about £615,550 — the median of the last 8 market sales in NW7 1LT, £380,000 to £1,300,000.
Contains HM Land Registry data © Crown copyright and database right 2025. 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.
Nearby applications
- 21 Thornfield Avenue London Borough of Barnet NW7 1LTPermittedNext door
- 15 Thornfield Avenue London Borough of Barnet NW7 1LTPermittedAdjoining
- London Borough of BarnetPermitted51 yd
- Garages at Mill Court, Holders Hill Road, Barnet NW7 1LPPermitted83 yd
- Garages at Mill Court, Holders Hill Road, Barnet NW7 1LPPermitted83 yd
- 1 Mill Close London Borough of Barnet NW7 1FURefused86 yd