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Permitted26/AP/1420Submitted 3 months agoLoft conversion

40 Strathnairn Street London Borough of Southwark SE1 5BL

Certificate of lawfulness (proposed) for construction of a ground floor rear extension and a rear dormer.

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Progress

Submitted
19 May 2026
— completed
Validated
19 May 2026
— completed
Consultation
— completed
Target date
13 Jul 2026
— completed
Decided
4 Aug 2026
— completed

Application details

Reference
26/AP/1420
Local authority
Southwark
Postcode
SE1 5BL
Ward
SOMB
Application type
All Other
Property type
House

Key dates

Submitted
19 May 2026
Validated
19 May 2026
Target decision
13 Jul 2026
Decided
4 Aug 2026

Estimated project value

£42k–£88k

Based on the 26.0m² of floor area stated in the application, at inner London rates (2026). Source: Checkatrade 2026, loft conversion £1,200-£2,500/m².

Floor area gained: 26 · 1 additional bedrooms

Recently sold nearby

New owners, recently moved in. First work on a house usually follows within months of completing. 3 recent sales are listed below.

Homes here go for about £573,600 — the median of the last 7 market sales in SE1 5BL, £480,000 to £735,000.

Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0. Sales are matched by postcode, not by property, so a sale listed here may be a neighbouring address. England and Wales only.

Planning constraints

No designations recorded at this location. This is not a formal search — always confirm with the local authority before relying on it.

Designations from planning.data.gov.uk, Open Government Licence v3.0. Indicative only — not a formal local authority search.

Recorded changes

  • 12 Aug 2026: Approved

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