40 Strathnairn Street London Southwark SE1 5BL

Pending 26/AP/1420
Extensions & alterations
Council
Southwark 7.3/10
Date received
18 May 2026
Date validated
19 May 2026
Postcode
SE1 5BL

Description

Certificate of lawfulness (proposed) for the erection of a single storey rear extension and the conversion and extension of the existing loft space at 40 Strathnairn Street, London, SE1 5BL, forming part of a two-storey mid-terraced dwellinghouse, under permitted development. The works include the formation of a single storey rear extension at ground floor level and a rear dormer extension to the existing roof. The loft conversion will provide an additional en-suite bedroom, including a shower room, storage/wardrobe space, and a new staircase connecting the first floor to the proposed loft level. The additional accommodation at both ground and loft levels will form an integral part of the existing single dwellinghouse and will be used by the occupants of the property.

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Historical activity at this location

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

Within ~100m

Nearby activity

2024 Approved
12 Strathnairn Street London Southwark SE1 5BL
Retrospective demolition of existing two-storey end of terrace house and construction of…
24/AP/1490
2023 Approved
163 Simms Road London Southwark SE1 5QJ
Construction of rear single storey side extension, with the addition of a roof lantern.
23/AP/1018
2022 Approved
10 Strathnairn Street London Southwark SE1 5BL
Construction of a ground floor rear extension and the installation of a roof light.
22/AP/3285
2022 Approved
42 Trothy Road London Southwark SE1 5RR
Construction of a two storey side extension, single storey rear extension and rear dormer…
22/AP/1737
2022 Approved
10 Strathnairn Street London Southwark SE1 5BL
Construction of a part single storey part two storey extension to the rear and the instal…
22/AP/1542
2022 Approved
28 Trothy Road London Southwark SE1 5RR
Construction of single storey front and rear extension, refuse bins and electric vehicle…
22/AP/1208
2021 Approved
12 Strathnairn Street London Southwark SE1 5BL
Construction of single storey ground floor rear extension complete with two roof lights…
21/AP/3796
2021 Approved
183 Simms Road London Southwark SE1 5LP
Construction of a single storey rear extension (to replace the existing) and the installa…
21/AP/3573
2021 Approved
12 Strathnairn Street London Southwark SE1 5BL
Hip to gable roof extension and rear dormer roof extension.
21/AP/3798
2021 Approved
1,2,5,9 And 10 Hannah Mary Way, SE1 5QG 1,2,3 And 5 Langdon Way, SE1 5QN 1 And 2 Kotree Way, SE1 5DA 31, 33, 37 And 41 Monnow Road, SE1 5RQ 50, 52, 54, 64 And 66 Monnow Road, SE1 5RQ
Replacement of all windows, fascias, soffits and barge boards, (where applicable).
21/AP/2643
2021 Approved
183 Simms Road London Southwark SE1 5LP
Constrution of rear dormer extension including Juliette Balcony and 1x rooflight to the f…
21/AP/2494
2021 Withdrawn
42 Trothy Road London Southwark SE1 5RR
Construction of a double storey side extension, double storey rear extension and rear dor…
21/AP/1541
2020 Approved
200 St Jamess Road London Southwark SE1 5LN
The construction of a two storey side extension, a single storey rear extension and two r…
20/AP/2474
2020 Approved
38 Strathnairn Street London Southwark SE1 5BL
The construction of a single storey rear extension; the addition of a Juliet balcony and…
20/AP/2230
2019 Approved
177 Simms Road London Southwark SE1 5LP
Construction of a single storey porch extension and the cladding of the side window.
19/AP/7520
2019 Approved
18 Strathnairn Street London Southwark SE1 5BL
Replacement windows with white PVC frames; new first floor level front window.
19/AP/7281
2019 Approved
161 Simms Road London Southwark SE1 5QJ
Demolition of existing single storey rear extension and construction of part one/part two…
19/AP/5716
2019 Approved
200 St Jamess Road London Southwark SE1 5LN
Construction of a two-storey side extension to the dwelling house with two dormer windows…
19/AP/5737
2019 Withdrawn
8 Trothy Road London SE1 5RR
Construction of a rear dormer extension with one bedroom, installing two skylight windows…
19/EQ/0171
2019
8 TROTHY ROAD, LONDON, SE1 5RR
Construction of a rear dormer extension with one bedroom, installing two skylight windows…
19/AP/2301
2018 Approved
163 Simms Road London SE1 5QJ
Construction of a two-storey extension to the side and rear of the existing rear outrigge…
18/AP/2692
2017 Approved
34 Trothy Road London SE1 5RR
Retention of rear dormer extension with juliette balcony and three rooflights in the fron…
17/AP/1642
2017 Withdrawn
34 TROTHY ROAD, LONDON, SE1 5RR
Construction of a rear dormer extension.
17/AP/2073
2017 Approved
27 Strathnairn Street London SE1 5BN
Lawful development certificate for a proposed development for the erection of a rear dorm…
17/AP/0158
2016 Approved
19 Trothy Road London SE1 5RR
Construction of a single storey rear extension.
16/AP/4609
Southwark
Planning Authority Score
7.3/10
Good
#47 of 292 councils
Relevant to this application:
Householder decisions

Southwark is faster than most councils at deciding householder applications, ranking #43 out of 292. 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 performance
Based on MHCLG data, 2025
91%
Overall approval rate
Above avg (87%) #105 of 292
95%
Householder approved
Above avg (90%) #87 of 292
80%
Decided in 8 weeks
Above avg (64%) #43 of 292
36%
Extended time limit
Below avg (40%) #111 of 292
92%
Minor dwellings approved
263 decided (1-9 homes)
70%
Major dwellings approved
10 decided (10+ homes)
78%
Change of use approved
36 decided
1,589
Total decisions
137 refused in 2025
Source: MHCLG planning statistics · See full council rankings