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Planning application

24 Onslow Gardens, Hornsey, London, N10 3JU

Granted Haringey HGY/2026/0940 Lawful development: Proposed use

Works: Loft or dormer

Permission granted. Work must normally begin within three years of the decision or the permission lapses.

Proposal

Certificate of lawfulness for the proposed erection of a rear dormer.

As published by the council, reference HGY/2026/0940

Application record

Reference
HGY/2026/0940
Type
Lawful development: Proposed use
Status
Decision Made
Decision
Granted As published: Permitted Development
Received
1 Apr 2026
Validated
1 Apr 2026
Decided
2 Apr 2026
Ward
Muswell Hill
Decision by
Delegated Decision
Postcode
N10 3JU

Site history

Applications at this address on the Haringey register

This site has had 3 applications since 2026: 3 approved, 0 refused.

  • HGY/2026/1679 Granted

    24 Onslow Gardens, Hornsey, London, N10 3JU

    Erection of a single storey rear and side extension and installation of rear rooflights to infill extension. (AMENDED DESCRIPTION)

    Decided 28 Aug 2026 Householder
  • HGY/2026/1408 Granted

    24 Onslow Gardens, Hornsey, London, N10 3JU

    Enlargement of existing rear dormer and installation of a front dormer window.

    Decided 14 Jul 2026 Householder

Timeline

Dates from the published record

  1. 1 Apr 2026

    Received by Haringey

  2. 2 Apr 2026

    Decision issued: Permitted Development

  3. 24 Jul 2026

    Added to PlanIndex

Documents

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

5 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.

Watch members (£5 a month) open the document list from here.

Open the documents

What this grant of permission means

Haringey granted permission on 2 April 2026, 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

  • 26 Onslow Gardens, Hornsey, London, N10 3JU

    HGY/2026/1715 Submitted 16 Jun 2026 50 yards away

    Certificate of Lawfulness for the proposed erection of a dormer extension to the rear and the installation of two rooflights on the front roof slope.

    Granted Lawful development Extension Loft or dormer 18 docs

  • 24 Onslow Gardens, Hornsey, London, N10 3JU

    HGY/2026/1408 Submitted 19 May 2026 50 yards away

    Enlargement of existing rear dormer and installation of a front dormer window.

    Granted Householder Loft or dormer Windows or glazing 10 docs
    Domestic

  • 24 Onslow Gardens, Hornsey, London, N10 3JU

    HGY/2026/1679 Submitted 15 Jun 2026 50 yards away

    Erection of a single storey rear and side extension and installation of rear rooflights to infill extension. (AMENDED DESCRIPTION)

    Granted Householder Extension Loft or dormer 7 docs
    Small domestic

  • 8 Onslow Gardens, Hornsey, London, N10 3JU

    HGY/2026/2710 Submitted 30 Sep 2026 50 yards away

    90% historically approved · decision due ~25 Nov

    Installation of zinc cladding, Juliet balcony and French doors to the existing rear outrigger.

    Awaiting decision Householder Extension Windows or glazing 11 docs
    Domestic

  • 26 Onslow Gardens, Hornsey, London, N10 3JU

    HGY/2026/1669 Submitted 24 Jun 2026 50 yards away

    90% historically approved · decision due ~19 Aug

    Erection of a wrap around ground floor rear extension and extension of first floor rear outrigger; erection of two front roof lights.

    Awaiting decision Householder Extension Loft or dormer 14 docs
    Domestic

  • 20, Onslow Gardens, London, N10 3JU

    HGY/2021/2396 Submitted 16 Aug 2021 50 yards away

    Non-material amendment following a grant of planning permission HGY/2021/1113 involving the retention of existing wall to allow for a bin store area

    Granted Amendments 4 docs

In Haringey

  • HGY/2026/2285 Granted

    13 Woollaston Road, Hornsey, London, N4 1SD

    Certificate of Lawfulness (proposed) for loft conversion with rear dormer extension.

    Received 14 Aug, published by the council 22 Aug 2026 Lawful development
  • HGY/2026/2357 Granted

    40 Falmer Road, Tottenham, London, N15 5BA

    Lawful development Certification for proposed erection of rear roof extension and insertion of front rooflight

    Received 21 Aug, published by the council 4 Oct 2026 Lawful development
  • HGY/2026/2692 Granted

    125 High Cross Road, Tottenham, London, N17 9NR

    Lawful development: Proposed use for change of use within Class E to a Nail shop (Class E(c)(iii))

    Received 29 Sep, published by the council 4 Oct 2026 Lawful development
  • HGY/2026/2637 Granted

    30 Gloucester Road, Tottenham, London, N17 6DH

    Lawful development: Proposed use. Loft conversion including 2x roof lights and L-shaped box dormer to the rear roof slopes with materials to match existing materials on main roof

    Received 21 Sep, published by the council 4 Oct 2026 Lawful development
  • HGY/2026/2420 Granted

    50 St Loys Road, Tottenham, London, N17 6UD

    Certificate of Lawfulness: Proposed erection of an L-shaped rear dormer including the insertion of 2nos. front rooflights.

    Received 28 Aug, published by the council 7 Sep 2026 Lawful development