Planning application
20 Thurleigh Avenue SW12 8AW
Works: Extension Loft or dormer Windows or glazing
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Variation of condition 2 pursuant to planning permission dated 22/11/2023 ref 2023/4388 (Alterations including erection of a hip to gable extension to main roof with dormer extension to rear roof. Erection of a ground floor side/rear extension and first floor side extension with roof extension over. Insertion of windows to ground floor front elevation in connection with use of garage as additional habitable accommodation.) to allow the addition of sliding doors to the rear elevation, removal of ground floor rear extension and replacement of conservatory like for like, retention of garage door, installation of side first floor window and change to the dormer from cladding to wall-hung concrete tiles.
As published by the council, reference 2025/4573
Application record
- Reference
- 2025/4573
- Type
- Variation of Condition
- Status
- FINAL DECISION
- Decision
- Approve with Conditions
- Received
- 18 Dec 2025
- Validated
- 13 Jan 2026
- Decided
- 12 Feb 2026
- Ward
- Balham
- Decision by
- Delegated Standard
- Postcode
- SW12 8AW
Timeline
Dates from the published record
-
18 Dec 2025
Received by Wandsworth
-
13 Jan 2026
Validated
Checked as complete and ready for consideration.
-
12 Feb 2026
Decision issued: Approve with Conditions
-
10 Aug 2026
Added to PlanIndex
Documents
Plans, drawings, consultee responses and the officer's report
7 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.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Wandsworth granted permission on 12 February 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 amendment applications
An amendment application makes limited changes to a permission that already exists; anything beyond modest adjustment needs a fresh application. More in our guide to planning application types.
Nearby applications
Within 500 metres
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14 Nightingale Lane SW12 8TB
Alterations including erection of hip-to-gable rear roof extension with dormers to side roofslopes; Erection of single storey outbuilding in rear garden to be used as granny annex; Removal of side vehicle access gate to be replaced with timber fencing and removal of dividing wall in rear garden.
Granted Householder Extension Loft or dormer 26 docsSmall domestic -
14 Nightingale Lane SW12 8TB
Alterations including erection of hip-to-gable rear roof extension with dormers to side roofslopes; Erection of a single storey outbuilding to rear garden.
Withdrawn Householder Extension Loft or dormer 22 docsSmall domestic -
3 Thurleigh Avenue SW12 8AN
89% historically approved · decision due ~7 Oct
Alerations including erection of dormer roof extension to main rear roof.
Awaiting decision Extension Loft or dormer -
32 Nightingale Lane SW12 8TD
89% historically approved · decision due ~6 Aug
Conversion of 9-bedroom HMO into a single family dwellinghouse (Class C3).
Awaiting decisionDomestic -
9 Clavering Place SW12 8DB
Alterations including erection of lower ground infill extension, enlargement of ground floor terrace and provision of external stairs to garden.
Granted Householder Extension 9 docsDomestic -
Thurleigh Court Nightingale Lane SW12 8AP
WITHDRAW T29 Poplar (x1) Reduce crowns by 4m back to previous points of reduction. Reason: To maintain the trees at a smaller size. They are on a four year pruning cycle because of their close proximity to buildings. T39 + T40 Sycamore (x2) Reduce crowns by 4m back to previous points of reductions. Reason: To maintain the trees at a smaller size. They are on a four year pruning cycle because of their close proximity to buildings.
Withdrawn Trees 3 docs
Other amendment applications
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2026/2953 Awaiting decision
2-18 Yelverton Road SW11 3QG
Variation of condition 30 pursuant to planning permission dated 22/12/2022 ref 2021/1682 (Erection of a part 3/17 storey mixed-use development plus basement, providing 369 sq.m of commercial office floor space (Class E) and 224 sq.m of creative workspace (flexible Class E/Sui Generis) at ground and basement levels and 79 residential units at upper levels; communal garden on the 3rd floor; with 6 car parking spaces and cycle parking spaces at basement level; disabled car parking space on Yelverton Road and visitor cycle parking spaces on York Road and associated infrastructure works.) so as to allow the change from restriction for use as creative workspace and no other purpose due to financial viability.
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2026/0960 Granted
5 A Quinton Street SW18 3QR
Variation of condition 2 (in accordance with approved drawings) pursuant to planning permission dated 04/06/2024 ref 2024/0668 (Alterations including erection of mansard roof extension to main rear roof; erection of roof extension and formation of roof terrace with 1.7m glass safety surround above two storey back addition. Installation of external staircase to rear elevation provide access to garden.) to allow design changes including roof and fenestration changes as follows: flat roof now flush, removal of windows to the dormer side wall, increase in the size of the roof terrace, front roof slope to include one skylight and two skylights on the flat roof, face of the primary dormer wing previously slanted, now straight, amendments to external staircase dimensions.
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2026/1469 Granted
The Old Warehouse 29 B 29B Shelgate Road SW11 1BB
Variation of condition 2 (in accordance with approved drawings), removal of condition 7 (Boundary treatment) and discharge of conditions 5 (Materials), 6 (Detailed drawings), 8 (Refuse) and 9 (Cycle parking) of planning permission dated 15/12/2020 ref 2020/3753 (as varied by application ref: 2025/3254 dated 13/11/2025 and by NMA 2026/0693 dated 19/03/2026) (Alterations to rear block facing Shelgate Road including erection of extension to form additional floor of accommodation in connection with creation of a three-storey 2-bed dwelling house; associated demolition of single storey ground floor extension currently in Use Class E(b) and change of part of ground floor from Class E(b) to C3(a).) to allow to substitute the approved drawings with those 'as built'.
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2026/2862 Awaiting decision
1 Frankland House Balham Hill SW12 9EF
Variation of condition 2 (in accordance with approved drawings) pursuant to planning permission dated 29/05/2026 ref 2026/0239 (Installation of replacement windows, re-roofing scheme and installation of PV panels to roofs. ) to allow change to orientation of the fixed panes of some of the windows to comply with Building Regulations. .
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2025/2809 Granted
189D E F G H K and L Balham High Road SW12 9BE
Variation of condition 8 (Obscured glazing) pursuant to planning permission dated 30/07/2019 ref 2019/1895 (Demolition of existing garages and erection of 7 x 3-storey (plus basement) 3-bedroom houses with associated landscaping, car and cycle parking.) to allow tilt and turn windows, or tilt-only windows to first and second floor bathroom window facing Ravenstone Street.