Planning application
HGY/2025/3558
11 Lansdowne Road, Hornsey, London, N10 2AX
Proposal
Certificate of Lawfulness for the proposed construction of outbuilding as replacement garden room in place of an existing shed structure.
As published by the council, reference HGY/2025/3558
Timeline
Dates from the published record
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22 Dec 2025
Received by Haringey
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24 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
-
HGY/2026/0658 Granted
9 Lansdowne Road, Hornsey, London, N10 2AX
G1 group of goat willow - reduce to previous reduction points (hedge height)
-
HGY/2025/3410 Granted
24, Lansdowne Road, London, N10 2AX
Replacement of ground floor windows and doors on the rear and side of the main building. Demolition of the existing garage at the rear of the property to be replaced by a new outbuilding. General facade repair works. Installation of air conditioning unit on rear façade of dwelling.
-
HGY/2024/2359 Granted
28 Grove Avenue, Hornsey, London, N10 2AR
Demolition of existing conservatory and erection of rear extension. Alteration to windows to north (side) elevation.
-
HGY/2026/1865 Awaiting decision
13 The Avenue, Hornsey, London, N10 2QE
Proposed bin store
-
HGY/2026/1117 Granted
13 The Avenue, Hornsey, London, N10 2QE
Application to regularising raised patio as built adding a 0.5 metre timber privacy screen above the existing boundary fence, and introducing evergreen planting (AMENDED DESCRIPTION).
-
HGY/2026/1229 Awaiting decision
21 The Avenue, Hornsey, London, N10 2QE
Creation of a dormer type loft extension and front roof lights.
Other lawful development applications
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.
-
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.
-
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).
-
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).