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Planning application

1 Summerlee Gardens London N2 9QN

Refused Barnet 25/4756/192 Proposed Lawful Development Certificate

Works: Extension Loft or dormer Windows or glazing Small domestic

Read from the description, not a valuation. How we read the register

Refused. Only the applicant can appeal, within the statutory time limit, and a revised scheme can be submitted instead.

Proposal

Single storey side return extension. Roof extension involving hip to gable with rear dormer windows with 3no. front facing rooflights

As published by the council, reference 25/4756/192

Application record

Reference
25/4756/192
Type
Proposed Lawful Development Certificate
Status
Unlawful
Decision
Refused As published: Unlawful
Received
28 Nov 2025
Validated
1 Dec 2025
Decided
17 Dec 2025
Ward
East Finchley
Decision by
Delegated Decision
Postcode
N2 9QN

Site history

Applications at this address on the Barnet register

This site has had 2 applications since 2025: 0 approved, 1 refused.

  • 26/0028/HSE Awaiting decision

    1 Summerlee Gardens London N2 9QN

    Single storey side return extension. Roof extension involving hip to gable with rear dormer windows with 3no. front facing rooflights

    Submitted 5 Jan 2026 Householder

Timeline

Dates from the published record

  1. 28 Nov 2025

    Received by Barnet

  2. 1 Dec 2025

    Validated

    Checked as complete and ready for consideration.

  3. 17 Dec 2025

    Decision issued: Unlawful

  4. 10 Aug 2026

    Added to PlanIndex

Who's behind it

Company information only, from the register and Companies House

Polygon Architects Agent, an architecture practice registered in Exeter

Active · incorporated 2015 · Exeter

2 applications on PlanIndex

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Documents

Plans, drawings, consultee responses and the officer's report

22 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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What this refusal means

Barnet refused this application for the reasons on the decision notice; only the applicant can appeal, and refused schemes often return in revised form. 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

  • 1 Summerlee Gardens London N2 9QN

    26/0028/HSE Submitted 5 Jan 2026 50 yards away

    77% historically approved · decision due ~3 Mar

    Single storey side return extension. Roof extension involving hip to gable with rear dormer windows with 3no. front facing rooflights

    Awaiting decision Householder Extension Loft or dormer +1 22 docs
    Small domestic

  • 55 Summerlee Avenue London N2 9QJ

    26/1048/HSE Submitted 18 Mar 2026 50 yards away

    Single storey rear extension with 2no. roof lanterns

    Granted Householder Extension 5 docs
    Small domestic

  • 55 Summerlee Avenue London N2 9QJ

    26/1649/HSE Submitted 1 May 2026 50 yards away

    Single storey rear extension with 2no. roof lanterns. Alterations to the existing patio area. Replacement of existing side store and insertion of 1no. rooflight

    Granted Householder Extension Loft or dormer 8 docs
    Small domestic

  • 82 Summerlee Avenue London N2 9QH

    26/3270/HSE Submitted 8 Sep 2026 100 yards away

    77% historically approved · decision due ~4 Nov

    Erection of wooden bike shed in the front garden

    Awaiting decision Householder
    Small domestic

  • 74 Summerlee Avenue London N2 9QH

    26/0288/192 Submitted 26 Jan 2026 100 yards away

    Erection of a garden studio following demolition of the existing garage

    Granted Lawful development Demolition 7 docs

  • 49 Baronsmere Road London N2 9QG

    25/4030/HSE Submitted 6 Oct 2025 100 yards away

    77% historically approved · decision due ~1 Dec

    Single storey side/rear extension

    Awaiting decision Householder Extension 3 docs
    Small domestic

In Barnet

  • 26/2679/192 Granted

    21 Myddelton Park London N20 0JH

    Single storey rear extension and increase in ridge height of existing rear outrigger (Amended description).

    Received 20 Jul, published by the council 7 Aug 2026 Lawful development
  • 26/1362/191 Refused

    145 Cotswold Gardens London NW2 1PL

    Use as a House in Multiple Occupation (HMO) for 6 people

    Received 14 Apr, published by the council 25 Jul 2026 Lawful development
  • 26/1907/191 Granted

    8 Golders Manor Drive London NW11 9HT

    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)

    Received 21 May, published by the council 16 Aug 2026 Lawful development
  • 26/2392/192 Refused

    6 Mostyn Road Edgware HA8 0JD

    New front hardstanding and vehicular access to provide off-street parking

    Received 23 Jun, published by the council 9 Aug 2026 Lawful development
  • 26/2059/192 Refused

    Low Ridge Rowley Lane Barnet EN5 3HS

    Erection of a rear outbuilding

    Received 3 Jun, published by the council 16 Aug 2026 Lawful development