Planning application
26/02044/FULL
Flat 45 2 Mansfield Street London W1G 9NF
Proposal
Roof extension to the existing mansard roof with associated elevational alterations on the Duchess Street and Rear Elevation, alterations to the existing mansard roof on the Mansfield Street Elevation including a new dormer window and the replacement of the existing external doors, two new rooflights at main roof level, installation of two external air conditioning (AC) condensers at main roof level, replacement of existing rooflights and windows, installation of new external cupboard at terrace level and internal reconfigurations throughout. (Linked with 26/02045/LBC)
As published by the council, reference 26/02044/FULL
Timeline
Dates from the published record
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27 Mar 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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26/02045/LBC Awaiting decision
Flat 45 2 Mansfield Street London W1G 9NF
Roof extension to the existing mansard roof with associated elevational alterations on the Duchess Street and Rear Elevation, alterations to the existing mansard roof on the Mansfield Street Elevation including a new dormer window and the replacement of the existing external doors, two new rooflights at main roof level, installation of two external air conditioning (AC) condensers at main roof level, replacement of existing rooflights and windows, installation of new external cupboard at terrace level and internal reconfigurations throughout. (Linked with 26/02044/FULL)
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25/07282/FULL Awaiting decision
4 Queen Anne Street London W1G 9LQ
Variaiton of Conditon 1 of planning permission dated 18 November 2024 (RN: 24/05063/FULL) for, 'Installation of two air conditioning units at main roof level with associated pipework on the rear elevation, installation of two grilles on the rear wall in the lightwell at lower ground floor level and internal alterations at lower ground and ground floor levels'; Namely, to amend the approved plans to allow for repositioning of the 2no. plant units on the roof in addition to providing new higher performance anti-vibration mounts. (Linked with 25/07252/LBC) (Application under Section 73 of the Act).
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25/07252/LBC Awaiting decision
4 Queen Anne Street London W1G 9LQ
Repositioning of the plant units and new anti-vibration mounts. (Linked with 25/07282/FULL)
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25/07255/FULL Awaiting decision
4 Queen Anne Street London W1G 9LQ
Variation of condition 1 of planning permission dated 22nd November 2024 (RN: 24/05074/FULL) for the Installation of one air conditioning unit at main roof level and two grilles within the window in the rear lightwell at ground floor level with associated pipework and internal alterations. Namely, to allow for repositioning of the plant unit on the roof in addition to providing new higher performance anti-vibration mounts. (Linked with 25/07251/LBC)
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25/07251/LBC Awaiting decision
4 Queen Anne Street London W1G 9LQ
Installation of additional anti-vibration mounts and reposition the currently approved plant unit. (Linked with 25/07255/FULL)
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22/01316/LBC Granted
Flat 16 2 Mansfield Street London W1G 9NF
Replacement windows and door to the rear elevation.
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26/04824/ADFULL Granted
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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.