Planning application
HGY/2025/3530
47 Fortis Green Avenue, Hornsey, London, N2 9LY
Proposal
Certificate of lawfulness (Proposed development) for the erection of a rear dormer including the insertion of 3x front rooflights and erection of a single storey rear extension.
As published by the council, reference HGY/2025/3530
Timeline
Dates from the published record
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19 Dec 2025
Received by Haringey
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11 Feb 2026
Decision issued: Approve
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24 Jul 2026
Added to PlanIndex
What a grant of permission means
The process from here
Permission has been granted, usually subject to conditions listed on the decision notice, some of which must be discharged before work starts. The decision notice on the council portal sets out exactly what was approved.
Work must normally begin within three years of the decision or the permission lapses. Neighbours cannot appeal a grant; challenging one means judicial review of how the decision was made, within tight time limits.
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/2026/1076 Granted
1 Fortis Green Avenue, Hornsey, London, N2 9LY
Alterations to rear patio door, closure of 4 existing windows on side elevation and proposed 2 new windows to side elevation. replacement of existing windows with likes for likes elsewhere.
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HGY/2026/0551 Awaiting decision
37 Midhurst Avenue, Hornsey, London, N10 3EP
De-conversion of 2 flats into a single dwelling house including: Removal of small bay tree, Single storey rear extension, Replacement of front door and windows, Loft conversion including rear dormer extension and front skylights, Installation of air sourced heat pump to left flank of the building.
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HGY/2021/1641 Granted
Flat 2, 3, Fortis Green Avenue, London, N2 9LY
Extension to existing basement and the creation of front and rear light wells.
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HGY/2026/0118 Granted
27 Collingwood Avenue, Hornsey, London, N10 3EH
T1: Beech (15m): Crown reduce by 1.5-2m and thin by 30% to keep tree at a size suitable for its location and as part of regular maintenance
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HGY/2026/0383 Granted
21 Collingwood Avenue, Hornsey, London, N10 3EH
T1- Eucalyptus tree with decayed trunk and presence of Ganoderma brackets - cut to ground level.
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HGY/2026/1922 Awaiting decision
35 Collingwood Avenue, Hornsey, London, N10 3EH
Installation of Air Conditioning Unit on flat roof to extension in side passage
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).