40 Strathnairn Street London Southwark SE1 5BL

Under consideration/assessment 26/AP/1420
Council
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.

Southwark
Planning Authority Score
7.2/10
Good
#46 of 282 councils
Relevant to this application:
Householder decisions

Southwark is faster than most councils at deciding householder applications, ranking #43 out of 282. 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%) #104 of 282
95%
Householder approved
Above avg (90%) #85 of 282
80%
Decided in 8 weeks
Above avg (64%) #43 of 282
36%
Extended time limit
Below avg (40%) #107 of 282
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