40 Northiam London Borough of Barnet N12 7HJ
Single storey side and rear extension including 3no. flat rooflights and alteration to the existing access steps following demolition of the side garage and rear outbuilding
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Progress
Application details
- Reference
- 26/2250/HSE
- Local authority
- Barnet
- Postcode
- N12 7HJ
- Ward
- TW22
- Application type
- Householder
- Property type
- Flat
Key dates
- Submitted
- 16 Jun 2026
- Validated
- 16 Jun 2026
- Target decision
- 11 Aug 2026
- Decided
- 5 Aug 2026
Estimated project value
£105k–£180k
Based on the 44.0m² 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: 44m²
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.
Recorded changes
- 12 Aug 2026: Approved
Nearby applications
- 40 Northiam London Borough of Barnet N12 7HJPermittedNext door
- 40 Northiam London Borough of Barnet N12 7HJRefusedNext door
- 40 Northiam London Borough of Barnet N12 7HJRefusedNext door
- 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