15 Sydenham Hill London Southwark SE26 6SH

26/AP/2548ConditionsApproved

Discharge / amendments

Approved on 1 October 2026

Site boundary (council red line)

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.

Received: 26 August 2026
Council: London Borough of Southwark

ReceivedReceived26 Aug
ValidatedValidated27 Aug
Consult.Consultation
TargetTarget Date
DecidedDecided1 Oct

Decided in 35 days (council typically 49)

About this application

This is an application to amend a permission at 15 Sydenham Hill London Southwark SE26 6SH. Southwark has handled 1,341 applications of this type. This one was decided in 35 days, 2 weeks quicker than Southwark's typical decision time. The site is in 1 listed building nearby. There have been 8 other applications at this address. In the past year there have been 83 applications across Dulwich Wood. We hold 2,166 applications in total for the SE26 postcode area.

97% of conditions applications at London Borough of Southwark were approved. Across all application types, the council typically decides in about 7 weeks (median).

Based on decided applications received in the last 3 years.Planning something similar? See what gets approved on your street

Application details

Postcode: SE26 6SH
Application type: Conditions
Scale / size: Small

Planning application dates

Date validated: 27 August 2026

Applicant and agent

Architect profile: PLANSTUDIO ARCHITECTURE LTD

Site constraints

Checking the site

2/3

Council recordsAppealsFlood risk

Designations that overlap or adjoin the site outline.

Tree Preservation Order: Ref 478Covers the site · +1 more
Brownfield land register: 13 Sydenham Hill SE26 6SHRegister site at or near this address
Flood zone 1: Low probability (rivers and sea)

Also checked, none recorded (22)

flood storage areas, conservation areas, listed buildings, Article 4 directions, green belt, scheduled monuments, World Heritage Sites, World Heritage Site buffer zones, registered parks and gardens, registered battlefields, Heritage at Risk entries, nutrient neutrality catchments, national parks, National Landscapes, SSSIs, Special Areas of Conservation, Special Protection Areas, Ramsar sites, ancient woodland, national nature reserves, local nature reserves and heritage coasts.

A guide only, from official open data; it is not a planning search. Flood zones cover rivers and sea, not surface water.

Data © Crown copyright and others · sources and licences

Contains public sector information from planning.data.gov.uk (MHCLG and local planning authorities), licensed under the Open Government Licence v3.0. © Crown copyright and database right 2026.

© Historic England 2026. Contains Ordnance Survey data © Crown copyright and database right 2026. The Historic England GIS Data contained in this material was obtained on 2026-11-03. The most publicly available up to date Historic England GIS Data can be obtained from HistoricEngland.org.uk.

Contains Ordnance Survey data © Crown copyright and database right 2026.

Source: Office for National Statistics licensed under the Open Government Licence v.3.0. Contains OS data © Crown copyright and database right 2026.

Associated applications

Source: Southwark

Contains public sector information from the Planning London Datahub, licensed under the Open Government Licence v3.0.

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