Planning application
40 Northiam London N12 7HJ
Works: Extension Loft or dormer Windows or glazing
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Roof extension involving hip to gable, rear dormer window, 3no. front facing rooflights and new side gable window
As published by the council, reference 25/4202/192
Application record
- Reference
- 25/4202/192
- Type
- Proposed Lawful Development Certificate
- Status
- Lawful
- Decision
- Granted As published: Lawful
- Received
- 20 Oct 2025
- Validated
- 20 Oct 2025
- Decided
- 17 Nov 2025
- Ward
- Totteridge & Woodside
- Decision by
- Delegated Decision
- Postcode
- N12 7HJ
Site history
Applications at this address on the Barnet register
This site has had 4 applications since 2025: 1 approved, 2 refused.
-
26/2250/HSE Decided
40 Northiam London 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
-
26/0613/HSE Refused
40 Northiam London N12 7HJ
Single storey side and rear extension including alteration to the existing access steps following demolition of the side garage and rear outbuilding
-
25/4397/PNH Refused
40 Northiam London 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
Timeline
Dates from the published record
-
20 Oct 2025
Received by Barnet
-
17 Nov 2025
Decision issued: Lawful
-
10 Aug 2026
Added to PlanIndex
Who's behind it
Company information only, from the register and Companies House
Reed Design and Build Agent, a design practice registered in Norwich
Liquidation · incorporated 2013 · Norwich
2 applications on PlanIndex · across 2 councils
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
8 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
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Open the documentsWhat this grant of permission means
Barnet granted permission on 17 November 2025, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About lawful development applications
A lawful development certificate is a legal determination that existing or proposed works do not need planning permission; the merits of the scheme are not considered. More in our guide to planning application types.
Nearby applications
Within 0.3 miles
-
40 Northiam London N12 7HJ
Single storey side and rear extension including alteration to the existing access steps following demolition of the side garage and rear outbuilding
Refused Householder Extension Demolition 14 docsSmall domestic -
40 Northiam London 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
Refused Prior approval Extension Demolition 6 docsSmall domestic -
71 Southover London N12 7HG
Submission of details of condition 7 (Noise mitigation - Air Con and ASHP) pursuant to planning permission 26/0983/HSE dated 15/06/2026
Granted Conditions 3 docs -
71 Southover London N12 7HG
77% historically approved · decision due ~15 Jun
Conversion of garage into habitable room including insertion of windows to replace existing garage doors and addition of new pitched roof with rooflight. Two storey side extension following demolition of existing store. Roof extension including 1no. side dormer window, 1no. rear dormer window and 2no. front facing rooflights and increase in ridge height. Installation of solar panels. Alterations to ground floor rear projection including changes to fenestration and insertion of rooflights to flat roof. Addition of 1no. AC condenser unit and 1no. Air Source Heat Pump to side elevation. Removal of chimneys
Awaiting decision Householder Extension Loft or dormer +3 6 docsDomestic -
40 Northiam London N12 7HJ
77% historically approved · decision due ~11 Aug
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
Decided Householder Extension Loft or dormer +1Several homes -
58 Northiam London N12 7HJ
77% historically approved · decision due ~8 Dec
Part single, part two storey front, side and rear extensions following demolition of existing garage and ground floor side and rear extension. Insertion of 1no. new first floor window to flank elevation. Alterations to front steps. New front porch. Alterations to rear patio
Awaiting decision Householder Extension Demolition +1 20 docsSmall domestic
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26/2679/192 Granted
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Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).
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26/1362/191 Refused
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Use as a House in Multiple Occupation (HMO) for 6 people
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26/1907/191 Granted
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Use of the property as a self-contained residential unit at ground floor level and the first and second floors as a 4-bedroom, 4-person House in Multiple Occupation (Sui Generis) (AMENDED DESCRIPTION)
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26/2392/192 Refused
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New front hardstanding and vehicular access to provide off-street parking
-
26/2059/192 Refused
Low Ridge Rowley Lane Barnet EN5 3HS
Erection of a rear outbuilding