Planning application
26/AP/1420
40 Strathnairn Street London Southwark SE1 5BL
Proposal
Certificate of lawfulness (proposed) for construction of a ground floor rear extension and a rear dormer.
As published by the council, reference 26/AP/1420
Timeline
Dates from the published record
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18 May 2026
Received by Southwark
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19 May 2026
Validated
Checked as complete and ready for consideration.
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25 Jul 2026
Added to PlanIndex
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Decision
Awaiting decision
The statutory target is eight weeks for most applications and thirteen for major development. Extensions of time are common.
What happens while it is decided
The process from here
This application is with Southwark for determination. The council publicises it, consults neighbours and technical bodies where required, and weighs the responses against local and national planning policy.
The statutory target is eight weeks for most applications and thirteen for major development, though extensions of time are common. Comments carry most weight while the case is undecided, so check the council portal for the deadline if you want to respond.
About lawful development applications
How this application type works
A lawful development certificate is a legal determination, not a planning judgement. It asks the council to confirm either that existing use or works are lawful, often through the passage of time, or that a proposal would not need planning permission at all. The applicant must prove the facts; the merits of the scheme are not considered.
Nearby applications
Within 500 metres
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20/AP/2230 Granted
38 Strathnairn Street London Southwark SE1 5BL
The construction of a single storey rear extension; the addition of a Juliet balcony and two windows to the rear elevation and one window to the front; and alterations to the fenestration of the front porch.
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22/AP/1542 Granted
10 Strathnairn Street London Southwark SE1 5BL
Construction of a part single storey part two storey extension to the rear and the installation of a roof light.
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20/AP/2297 Granted
17 Trothy Road London Southwark SE1 5RR
Certificate of Lawful Development (Proposed) for the demolition existing conservatory and the construction of a new 3m deep rear extension, retractable hoarding, new decking, new pergola and new shed.
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26/AP/1357 Granted
22 Trothy Road London Southwark SE1 5RR
Certificate of lawfulness (proposed) for single storey rear extension; rear dormer extension and front porch.
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22/AP/3844 Granted
153 Simms Road London Southwark SE1 5QJ
Replacement of all front and rear windows and rear garden door with timber double glazed windows and timber double glazed garden door.
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26/AP/1169 Granted
25 Esmeralda Road London Southwark SE1 5RJ
Certificate of lawfulness (proposed) for a rear dormer roof extension and three rooflights to the front main roof
Other lawful development applications
In Southwark
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26/AP/1647 Granted
7 Medlar Street London Southwark SE5 0JU
Certificate of lawfulness (proposed) for the construction of an L-shaped rear dormer extension and installation of 2no. rooflights to the front roof slope
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26/AP/2189 Awaiting decision
Surrey Square Park Surrey Square London Southwark SE17 2JX
Certificate of Lawfulness (existing) for refurbishment and reconfiguration of the existing children's playground and landscape improvements including new pathways and planting within Surrey Square Park.
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26/AP/2168 Awaiting decision
150A Lower Road London Southwark SE16 2UG
Certificate of lawfulness (proposed) for the change of use of a single dwellinghouse (Use Class C3) to a House in Multiple Occupation (Use Class C4) occupied by three unrelated individuals.
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26/AP/1618 Granted
252 Barry Road London Southwark SE22 0JS
Certificate of lawful development (proposed) for the construction of a rear dormer extension.
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26/AP/1577 Granted
Residence Inn By Marriott London Bridge 201-211 Long Lane London SE1 4PN
Certificate of lawfulness (proposed) for undertaking of facade remedial works to remove combustible cladding materials and replace with a like-for-like non-combustible cladding with no change to the outer aesthetics of the building.