40 Northiam London Borough of Barnet N12 7HJ
Single storey rear and side extension with a proposed depth from the rear wall of 4.00m, maximum height of 3.00m and eaves height of 3.00m following the demolition of the existing side extension and shed
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Progress
Application details
- Reference
- 25/4397/PNH
- Local authority
- Barnet
- Postcode
- N12 7HJ
- Ward
- TW22
- Application type
- Prior Approval
- Property type
- House
Key dates
- Submitted
- 5 Nov 2025
- Validated
- 5 Nov 2025
- Target decision
- 17 Dec 2025
- Decided
- 10 Dec 2025
Estimated project value
£110k–£185k
Based on the 46.0m² of floor area stated in the application, at inner London rates (2026). Source: FMB / Checkatrade 2026, single-storey extension £1,800-£3,000/m².
Floor area gained: 46m²
Recently sold nearby
Inside the two years most owners do their major work — kitchens, bathrooms, rewires and lofts. 2 recent sales are listed below.
- 46 NORTHIAM, LONDON, N12 7HJSemi-detached · £1,290,0009 months ago11 Dec 2025
- 40 NORTHIAM, LONDON, N12 7HJSemi-detached · £1,001,00010 months ago17 Oct 2025
- 54 NORTHIAM, LONDON, N12 7HJSemi-detached · £935,0007 years ago29 Apr 2019
- 56 NORTHIAM, LONDON, N12 7HJDetached · £968,0007 years ago18 Jan 2019
- 76 NORTHIAM, LONDON, N12 7HJDetached · £1,250,00012 years ago29 May 2014
- 64 NORTHIAM, LONDON, N12 7HJSemi-detached · £999,95012 years ago27 May 2014
- 52 NORTHIAM, LONDON, N12 7HJSemi-detached · £700,00013 years ago1 Aug 2013
- 58 NORTHIAM, LONDON, N12 7HJDetached · £680,00014 years ago18 Nov 2011
Homes here go for about £983,975 — the median of the last 8 market sales in N12 7HJ, £680,000 to £1,290,000.
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
- 40 Northiam London Borough of Barnet N12 7HJPermittedNext door
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- 42 Northiam London Borough of Barnet N12 7HJPermittedNext door
- 71 Southover London Borough of Barnet N12 7HGPermitted46 yd
- 71 Southover London Borough of Barnet N12 7HGPermitted46 yd