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Planning application

HGY/2026/1715

26 Onslow Gardens, Hornsey, London, N10 3JU

Awaiting decision Haringey Lawful development: Proposed use

Proposal

Lawful development: Proposed use for the erection of a rear dormer with 2 no. rooflights on the front roof slope.

As published by the council, reference HGY/2026/1715

Timeline

Dates from the published record

  1. 16 Jun 2026

    Received by Haringey

  2. 24 Jul 2026

    Added to PlanIndex

  3. Decision

    Awaiting decision

    The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.

What happens while it is decided

The process from here

This application is with Haringey for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.

The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.

About lawful development applications

How this application type works

A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.

More on lawful development applications in our guide

Nearby applications

Within 500 metres

  • HGY/2026/1408 Granted

    24 Onslow Gardens, Hornsey, London, N10 3JU

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

    19 May 2026 0m away Householder
  • HGY/2026/1679 Awaiting decision

    24 Onslow Gardens, Hornsey, London, N10 3JU

    Erection of a single storey rear and side wraparound extension.

    15 Jun 2026 0m away Householder
  • HGY/2026/1669 Awaiting decision

    26 Onslow Gardens, Hornsey, London, N10 3JU

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

    24 Jun 2026 0m away Householder
  • HGY/2026/0940 Granted

    24 Onslow Gardens, Hornsey, London, N10 3JU

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

    1 Apr 2026 0m away Lawful development
  • HGY/2026/1413 Awaiting decision

    50 Woodland Gardens, Hornsey, London, N10 3UA

    Removal/variation of condition 3 (Design and Materials) as attached to planning permission HGY/2015/1450 as approved on 09/07/2015 for 'Conversion of single family dwelling into 3 self-contained flats (2 x 3 bedroom and 1 x 1 bedroom). Construction / adaptation of rear roof to include 3 x dormers, installation of rooflights to front roofslope, and insertion of 1 new window and enlargement of 2 windows to lower ground floor'

    23 Jun 2026 100m away Amendments
  • HGY/2026/1036 Granted

    Ground Floor Flat A, 26 Woodland Gardens, Hornsey, London, N10 3UA

    Non-Material Amendment application following a grant of planning permission HGY/2021/2079 in relation to the alteration to the rear of the house:- 1. Minor amendment to the design of the central door, now in white timber, with double-glazing; 2. Revision to the design of the window on the right, to be exactly the same design as the existing window but in double-glazed white uPVC; 3. The window on the left to remain as a window rather than forming a new double door, retaining exactly the same design as the existing window but in double-glazed white uPVC.

    13 Apr 2026 100m away Amendments

In Haringey

  • HGY/2026/2104 Granted

    17 Sperling Road, Tottenham, London, N17 6UQ

    Certificate of lawfulness for proposed use: Loft conversion with erection of rear L-shaped dormer and insertion of 2no. front rooflights.

    23 Jul 2026 Lawful development
  • HGY/2026/1307 Granted

    49 Lordsmead Road, Tottenham, London, N17 6EX

    Certificate of lawfulness for the existing use of the property as five separate self-contained flats.

    8 May 2026 Lawful development
  • HGY/2026/1885 Granted

    6, Grainger Road, London, N22 5LT

    Certificate of Lawfulness: Proposed alterations to the roof comprising the installation of 3no. rooflights (2no. front facing and 1no. rear facing).

    6 Jul 2026 Lawful development
  • HGY/2026/1375 Granted

    Flats 1, 2, & 3 149 Crescent Road, Wood Green, London, N22 7RU

    Certificate of lawfulness for the existing use of the property as 3 self-contained flats (comprising of ground floor 2 bed, first floor 2 bed, second floor 1 bed) for more than 4 years.

    14 May 2026 Lawful development
  • HGY/2026/1409 Granted

    492 Archway Road, Hornsey, London, N6 4NA

    Certificate of Lawfulness Existing Use. Use of lower ground floor as two flats (Use Class C3).

    19 May 2026 Lawful development