310B East Street London Southwark SE17 2SX Data via plota.co.uk

26/AP/1464 - Certificate of Lawful Dev. - Proposed Approved
Extensions & alterations

Proposal

Certificate of lawfulness (proposed) to replace existing single glazed windows with like-for-like double glazed windows in order to a class C EPC rating. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
21 May 2026
✓
Approved
9 Jul 2026

Approved on 9 Jul 2026 · Delegated Panel - Simple · Last checked 11 Jul 2026

Documents 6

Statements & assessments 1

PDF PLANNING STATEMENT Planning statement · 21 May 2026 View ↗

Plans & drawings 1

PDF PROPOSED ELEVATIONS Plan - Proposed · 21 May 2026 View ↗

Application forms 1

PDF APPLICATION FORM - WITHOUT PERSONAL DATA Application - Form (Without Personal data) · 21 May 2026 View ↗

Other documents 3

PDF VALID APPLICATION LETTER WITH INVOICE Valid Application Letter · 26 May 2026 View ↗ PDF CORNER HOUSE Photographs and photomontages · 21 May 2026 View ↗ PDF REAR VIEW Photographs and photomontages · 21 May 2026 View ↗

All documents on the council site ↗

Site constraints 8

Flood zone 3, rivers and sea
High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.
The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.
Flood map ↗
Thomas A'Becket and High Street conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
Air quality management area: Southwark AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
National infrastructure project 896 m away: Thames Tideway Tunnel
The site is 896 m from the project boundary. Waste water treatment, decided. The project page says whether consent was granted. Also within 2 km: London Strategic Heat Main Project (at pre-application, 451 m).
Nationally significant infrastructure projects (power stations, electricity lines, pipelines, major roads and railways, harbours, airports and reservoirs) are consented by a Secretary of State under the Planning Act 2008, after an examination by the Planning Inspectorate, rather than by the council. The boundary is the one the Inspectorate consults on and can change as the scheme does. Projects are shown within 2 km of the site.
Planning Inspectorate project page ↗
Also on the record
Radon affected area, class 2; 2 listed buildings within 150 m; Inside the Southwark built-up area; Public transport access: PTAL 4 (good), TfL 2023, for the 100 m square.
Not affected
Not green belt · No scheduled monument at the site

Checked on 2 November 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, the British Geological Survey and UK Health Security Agency (radon, contains BGS materials © UKRI), Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Building

Floor area92 m² (990 sq ft)
Energy ratingD (59 out of 100), could reach C
PropertyMid-terrace flat, 4 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in April 2021, the latest held for this property, matched to this application by its address. The building may have changed since. View the certificate

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Important details

Council
Southwark
Application type
Certificate of Lawful Dev. - Proposed
Postcode
SE17 2SX
Received
21 May 2026
Validated
21 May 2026
Ward
Faraday
Parish
Borough, Bankside And Walworth
Case officer
Show
Target decision
15 Jul 2026
Decision
Certificate of Lawfulness Prop- GRANTED
Decision date
9 Jul 2026
Decision level
Delegated Panel - Simple
Applicant
Show

How this decision compares

Decided in 49 days from validation, about the council's usual 52 days. Approved, as 93% of extensions here are.

73%decided within 8 weeks
93%approved
735decided in the last year

Plota live figures for extensions decided by Southwark in the last twelve months, from validation. Southwark decision record →

Consultation & key dates

Statutory expiry
15 Jul 2026
Env. assessment
No

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025 Approved
32 Freemantle Street London Southwark SE17 2JP
Works to a tree in a conservation area: T1. Pear Tree. In rear garden of 32 Freemantle St…
25/AP/2698
2025
36 Surrey Square London Southwark SE17 2JX
Works to tree with a TPO: - T1 (Poplar): Crown reduction of no more than 7m to leave the…
25/AP/2519
2025
First Floor Flat 176 - 178 Old Kent Road London Southwark SE1 5TY
Single storey first floor rear extension
25/AP/2419
2025
320A And 320B East Street London Southwark SE17 2SX
Replacement of existing rear extension with a slightly larger extension and provision of…
25/AP/2023
2025 Approved
18 Surrey Square London Southwark SE17 2JX
Construction of full-width single storey side-rear extension with side entrance porch at…
25/AP/0342
2025
11 Minnow Walk London Southwark SE17 2JR
Replacement of existing uPVC double-glazed casement windows with proposed timber double-g…
25/AP/0733
2024 Approved
24 Surrey Square London Southwark SE17 2JX
Listed building consent for the works include the installation of a capillary trench for…
24/AP/2561
2024 Approved
24 Surrey Square London Southwark SE17 2JX
Repair and structural stabilisation of the external rear wall using internal wall bracket…
24/AP/1837
2023 Approved
18 Surrey Square London Southwark SE17 2JX
Works to trees in a conservation area:(T1) Elder: crown reduce and reshape by 35% - too l…
23/AP/2650
2023 Approved
24 Surrey Square London Southwark SE17 2JX
Extend the lower ground floor up to the existing external stair to create a garden room a…
23/AP/1649
2023 Approved
24 Surrey Square London Southwark SE17 2JX
Extend the lower ground floor up to the existing external stair to create a garden room a…
23/AP/1650
2023 Approved
Second Floor Flat 176-178 Old Kent Road London Southwark SE1 5TY
Erection of a mansard roof extension to extend an existing second floor flat.
23/AP/0641
2023 Approved
36-38 Surrey Square London Southwark SE17 2JX
Works to trees in a conservation area: 1 Black Poplar - Reduce crown to previous cut 1 Li…
23/AP/1061
2022 Refused
Second Floor Flat 176-178 Old Kent Road London Southwark SE1 5TY
Erection of a mansard roof extension to extend an existing second floor flat.
22/AP/4097
2022 Approved
36A Surrey Square London Southwark SE17 2JX
New single glazed and slimline double glazed timber sash windows painted white No changes…
22/AP/0486
2021 Approved
13 Freemantle Street London Southwark SE17 2JP
Construction of single storey rear extension.
21/AP/3643
2021 Approved
320B East Street London Southwark SE17 2SX
Construction of a balcony to first floor rear of the property, proposed replacement of re…
21/AP/1926
2019 Approved
176-178 Old Kent Road London Southwark SE1 5TY
Change of use from A1 to A3 for Ground Floor Unit and installation of mechanical extracti…
19/AP/2549
2018 Approved
30 Surrey Square London SE17 2JX
Construction of a self contained garden office in rear garden of timber construction
18/AP/3959
2018 Withdrawn
30 Surrey Square London SE17 2JX
Construction of a single storey building in the garden for use as an office
18/AP/3342
2018 Approved
346 East Street London SE17 2SX
Display of integral illumination and screen to the ATM fascia, Internally illuminated Fre…
18/AP/0405
2018 Approved
346 East Street London SE17 2SX
Installation of an ATM
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2017 Approved
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Construction of a 20 sqm extension to the west of the East Street Library to provide a fl…
17/AP/2138
2016 Refused
342 East Street London SE17 2SX
Reconfiguration of the ground floor shop unit, construction of a first floor rear extensi…
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2016 Approved
15 Minnow Walk London SE17 2JR
To remove tree in the front of the property (Sorbus Intermedia specie)
16/AP/3882
Southwark
Planning Authority Score
7/10
Good
#64 of 296 councils
Relevant to this application:
Householder decisions

Southwark is faster than most councils at deciding householder applications, ranking #54 out of 296. Householder applications are slightly more likely to be approved here (95%) than the national average (90%).

Faster than most councils
for householder decisions
These figures are council-wide context, not a prediction for this application. View full council performance
Southwark decision statistics
Based on MHCLG data, the year to March 2026
92%
Overall approval rate
Above avg (87%) #93 of 296
95%
Householder approved
Above avg (90%) #92 of 296
78%
Decided in 8 weeks
Above avg (63%) #54 of 296
37%
Extended time limit
Below avg (41%) #122 of 296
92%
Minor dwellings approved
259 decided (1-9 homes)
86%
Major dwellings approved
14 decided (10+ homes)
82%
Change of use approved
38 decided
1,622
Total decisions
132 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.