Planning application
HGY/2026/1715
26 Onslow Gardens, Hornsey, London, N10 3JU
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
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16 Jun 2026
Received by Haringey
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24 Jul 2026
Added to PlanIndex
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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.
Nearby applications
Within 500 metres
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HGY/2026/1408 Granted
24 Onslow Gardens, Hornsey, London, N10 3JU
Enlargement of existing rear dormer and installation of a front dormer window.
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HGY/2026/1679 Awaiting decision
24 Onslow Gardens, Hornsey, London, N10 3JU
Erection of a single storey rear and side wraparound extension.
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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.
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HGY/2026/0940 Granted
24 Onslow Gardens, Hornsey, London, N10 3JU
Certificate of lawfulness for the proposed erection of a rear dormer.
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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'
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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.
Other lawful development applications
In Haringey
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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.
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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.
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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).
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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.
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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).