Planning application
26/02841/FULL
Sofia House 19 Conduit Street London W1S 2BH
Proposal
Erection of five storey rear extension including extension of lower ground floor, roof level alterations, including new dormers and extension to rear, installation of plant and alterations associated with refurbishment of building
As published by the council, reference 26/02841/FULL
Timeline
Dates from the published record
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29 Apr 2026
Received by Westminster
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21 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 Westminster 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 full applications applications
How this application type works
A full application seeks permission for a complete, detailed proposal in one go: siting, design, access and landscaping are all fixed at this stage. It is the standard route for new buildings, conversions and changes of use. The statutory target is eight weeks for smaller schemes and thirteen weeks for major development, though complex cases often take longer by agreement.
Nearby applications
Within 500 metres
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26/02022/FULL Awaiting decision
20 Conduit Street London W1S 2XW
Installation of two conservation style rooflights at roof level, installation of one rear casement window at fifth floor level, replacement of existing maintenance access door with new glazed door, replacement of damaged roof tiles and installation of insulation; and removal and installation of two new MVHR extract and intake roof cowls. (Linked to 26/02023/LBC)
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25/06305/LBC Granted
20 Conduit Street London W1S 2XW
Installation of replacement ground floor primary office entrance door; Retention of fanlight and recolouring of building number signage and replacement of intercom. (Linked to 25/06304/FULL)
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25/06304/FULL Granted
20 Conduit Street London W1S 2XW
Installation of replacement ground floor primary office entrance door; Retention of fanlight and recolouring of building number signage and replacement of intercom.(Linked to 25/06305/LBC)
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26/02023/LBC Awaiting decision
20 Conduit Street London W1S 2XW
Internal alterations at fifth floor level, installation of two conservation style rooflights at roof level, installation of one rear casement window at fifth floor level, replacement of existing maintenance access door with new glazed door, replacement of damaged roof tiles and installation of insulation; and removal and installation of two new MVHR extract and intake roof cowls. (Linked to 26/02022/FULL)
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26/02839/ADFULL Awaiting decision
6 - 8 Mill Street London W1S 2AZ
Detailed drawings of the fixed glazed awning and retractable awning pursuant to condition 3 of planning permission dated 17th March 2026 (RN: 25/06233/FULL).
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25/05998/FULL Granted
4 Mill Street London W1S 2AX
Erection of a rear roof extension at third floor level with a sedum roof to the rear; replacement of windows at second floor level with double glazing timber windows; replacement of door and window to the existing rear first floor extension with double glazing timber windows including replacement of roofing; and associated works all in connection with the use of the first to third floor as four flats (Class C3)
Other full applications applications
In Westminster
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26/04824/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Detailed design and specification of new blinds to NZH based on mock-up trials on-site. pursuant to condition 32 (i) of planning permission dated 8th April 2024 (23/00571/FULL).
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26/04829/ADFULL Granted
New Zealand House 80 Haymarket London SW1Y 4TE
Details of external and internal signage strategy pursuant to Condition 33(E) of planning permission dated 8th April 2024 (RN: 23/00571/FULL)
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26/04841/ADFULL Granted
29 Henstridge Place London NW8 6QD
Details of the facing materials you will use, including glazing, and elevations and roof plans annotated to show where the materials are to be located pursuant to condition 5 of planning permission dated 18th November 2025 (RN:25/06159).
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26/04989/FULL Awaiting decision
1 Kildare Terrace London W2 5JT
Erection of a mansard roof extending over the main house and side wing, replacement lower ground rear extension with roof terrace above, lowering of lower ground floor slab, installation of an air source heat pump in rear garden, new front boundary treatment, and new second floor window on the north elevation.
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26/04986/FULL Awaiting decision
Inver Court Inverness Terrace London W2 6JB
Replacement of combustible materials in the render facades; timber decking and plastic soffits/ fascias to terraces with non-combustible materials on the 5th and 6th floors.