Planning application
15 Sydenham Hill London Southwark SE26 6SH
Works: Extension Loft or dormer Windows or glazing Small domestic
Read from the description, not a valuation. How we read the register
Relates to 25/AP/3772
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Non-material amendment of planning permission 25/AP/3772 (Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.) NMA:Omission of the basement works, and a corresponding alteration to the terrace on the ground floor. Omission of the side staircase extension in the south-east elevation. Minor amendment to the fenestration in the north-west elevation.
As published by the council, reference 26/AP/2548
Application record
- Reference
- 26/AP/2548
- Status
- Under consideration/assessment
- Received
- 26 Aug 2026
- Validated
- 27 Aug 2026
- Postcode
- SE26 6SH
Site history
Applications at this address on the Southwark register
This site has had 10 applications since 2023: 1 approved, 0 refused.
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26/AP/2227 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of Condition 5 (Detailed drawings) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2254 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of Condition 4 (Material samples) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2074 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of condition 8 (Hedgehog accesses) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2042 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of condition 3 (Demolition and Construction Environmental Management Plan (DCEMP)) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2075 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of condition 9a (Bee bricks and/or invertebrate hotels) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2073 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of condition 7a (Bat tubes, bricks or boxes) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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26/AP/2044 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Details of condition 6a (Bird boxes) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
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25/AP/3772 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Single-storey rear extension, side staircase, extension to existing annexe, basement conversion with extension, roof dormers and front boundary treatment.
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23/AP/1965 Granted
15 Sydenham Hill London Southwark SE26 6SH
Works to TPO trees:T1 - Cherry tree approximately 6m in height: Crown thin by 20% including the removal of dead wood and necessary re-shaping. The height and basic shape would be retained. It is important to prune branches at convenient growth points rather than an all round reduction or pollarding which is not permitted.T2 - Camellia tree approximately 6m in height: Reduce in height to just below cill level of the front bedroom window and reshape as necessary.T3 - Almond tree approximately 6m in height: Crown thin by 20% including the removal of dead wood and necessary reshapingT4 - Oak tree approximately 16m in height: Crown thin by 20% including the removal of dead wood and necessary reshaping. The height and basic shape should be retained. It is important to prune branches at convenient growth points rather than an all round reduction or pollarding which is not permitted.T5 - Camellia tree approximately 5.5m in height: Reduce all round to a more formal shape including the removal of dead wood.T6 - Magnolia tree approximately 5-6m in height: Reshape to form a more balanced specimen including the removal of dead woodT7 - Two cherry trees approximately 7.5m in height: Lightly thin and reshape to provide more formal specimensT8 - Hornbeam group approximately 9m in height: The height to be reduced from under the Oak canopy and crown thinned by 20% including the removal of dead wood and necessary reshaping.T9 - Yew tree approximately 6m in height: Crown thin by 20% including the removal of dead wood and necessary reshaping. The height and basic shape should be retained.
Timeline
Dates from the published record
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26 Aug 2026
Received by Southwark
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27 Aug 2026
Validated
Checked as complete and ready for consideration.
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28 Aug 2026
Added to PlanIndex
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Decision
Awaiting decision
Decision expected by 22 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Southwark took a median of 52 days over the applications it decided in the last year.
Related applications
Cases linked to this one on the register
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25/AP/3772 Awaiting decision
15 Sydenham Hill London Southwark SE26 6SH
Single-storey rear extension, side staircase, extension to existing annexe, basement conversion with extension, roof dormers and front boundary treatment.
What happens while it is decided
This application is with Southwark for determination, against a statutory target of eight weeks. Over the last year Southwark's median decision took 52 days. More in our guide to how long planning decisions take.
About this record
The published feed does not state which type of application this is; the register entry on Southwark's portal will say. Our guide explains the common types.
Nearby applications
Within 500 metres
-
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~8 Sep
Details of condition 8 (Hedgehog accesses) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +1Small domestic -
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~8 Sep
Details of condition 3 (Demolition and Construction Environmental Management Plan (DCEMP)) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +2Small domestic -
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~8 Sep
Details of condition 9a (Bee bricks and/or invertebrate hotels) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +1Small domestic -
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~8 Sep
Details of condition 7a (Bat tubes, bricks or boxes) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +1Small domestic -
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~8 Sep
Details of condition 6a (Bird boxes) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +1Small domestic -
15 Sydenham Hill London Southwark SE26 6SH
95% historically approved · decision due ~22 Sep
Details of Condition 5 (Detailed drawings) as required by planning permission 25/AP/3772 'Construction of single storey rear extension with patio and steps, basement extension to provide indoor swimming pool with terrace atop, south side extension to provide internal staircase to basement and three dormer windows to rear roof slope, remodelling and extension of existing annexe to north side of house, alterations to existing ground floor fenestration, and installation of new front boundary treatment.'
Awaiting decision Extension Loft or dormer +1Small domestic