Planning application
17 Grosvenor Street London W1K 4QH
Works: Loft or dormer
Permission granted. Work must normally begin within three years of the decision or the permission lapses.
Proposal
Installation of air source heat pump in modified plant enclosure; green roof and rooflights; modifications to front mansard profile and front elevation.
As published by the council, reference 25/09112/FULL
Application record
- Reference
- 25/09112/FULL
- Type
- Full Planning Permission Application
- Status
- Decided
- Decision
- Application Permitted
- Received
- 17 Dec 2025
- Validated
- 17 Dec 2025
- Decided
- 2 Apr 2026
- Ward
- West End
- Decision by
- Delegated Decision
- Postcode
- W1K 4QH
Site history
Applications at this address on the Westminster register
This site has had 2 applications since 2025: 1 approved, 0 refused.
-
26/05516/FULL Awaiting decision
17 Grosvenor Street London W1K 4QH
Variation of condition 1 of planning permission dated 2nd April 2026 (RN:25/09112/FULL) for the Installation of air source heat pump in modified plant enclosure; green roof and rooflights; modifications to front mansard profile and front elevation. Namely, omission of 3 rooflights over the 4th floor and addition of a dormer window at the 4th floor rear and addition of a mechanical vent and heat recovery unit at the rear of the central flat roof. (Application under section 73 of the Act)
Timeline
Dates from the published record
-
17 Dec 2025
Received by Westminster
-
2 Apr 2026
Decision issued: Application Permitted
-
20 Jul 2026
Added to PlanIndex
Related applications
Cases linked to this one on the register
1 later application on the register refers to this one:
-
26/05516/FULL Awaiting decision
17 Grosvenor Street London W1K 4QH
Variation of condition 1 of planning permission dated 2nd April 2026 (RN:25/09112/FULL) for the Installation of air source heat pump in modified plant enclosure; green roof and rooflights; modifications to front mansard profile and front elevation. Namely, omission of 3 rooflights over the 4th floor and addition of a dormer window at the 4th floor rear and addition of a mechanical vent and heat recovery unit at the rear of the central flat roof. (Application under section 73 of the Act)
Who's behind it
Company information only, from the register and Companies House
COWIE MONTGOMERY ARCHITECTS LLP Agent, an architecture practice registered in East Sussex
Active · incorporated 2006 · East Sussex
2 applications on PlanIndex
Trade members see everything this firm has filed, how it was decided, and get an email the day it files again.
See their track recordDocuments
Plans, drawings, consultee responses and the officer's report
35 documents on file for this application
A planning file usually holds the application form, drawings and site plans, consultee responses, the officer's report and the decision notice.
Trade members open them from here.
Open the documentsWhat this grant of permission means
Westminster granted permission on 2 April 2026, subject to any conditions on the decision notice. Work must normally begin within three years or the permission lapses. More in our guide to what happens after a planning decision.
About full applications
A full application seeks permission for a complete, detailed proposal in one go, with siting, design, access and landscaping all fixed at this stage. More in our guide to planning application types.
Nearby applications
Within 500 metres
-
14 Brook's Mews London W1K 4DT
Display for a temporary period of six months of a non-illuminated 'to let' Estate Agent Board located on the face of the building at a height of between 3m and 4.6m above pavement level and measuring 1.2m x 0.9m.
Granted Advertising 2 docs -
14 Brook's Mews London W1K 4DT
Display for a temporary period of six months of a non-illuminated 'to let'/ 'for sale' board located on the face of the building at a height of between 3m and 4.6m above pavement level and measuring 1.2m x 0.9m.
Granted Advertising 2 docs -
14-16 Brook's Mews London W1K 4DT
Detailed drawings and a bio-diversity management plan in relation to the green roof; to include construction method, layout, species and maintenance regime pursuant to Condition 4 of planning permission dated 21 December 2011 (RN: 11/07641).
Granted Full applications 10 docs -
14 Brook's Mews London W1K 4DT
Display for a temporary period of six months of a non-illuminated 'to let' Estate Agent Board located on the face of the building at a height of between 3m and 4.6m above pavement level and measuring 1.2m x 0.9m.
Granted Advertising 1 doc -
17 Brook's Mews London W1K 4DT
Use of the ground floor as a management office in association with the residential accommodation. Installation of a new glazed shopfront and entrance door.
Refused Full applications Windows or glazing 9 docs -
17 Brook's Mews London W1K 4DT
Replacement of existing entrance doors and new paving to entrance recess.
Granted Full applications 8 docs
Other full applications
In Westminster
-
26/06295/FULL Awaiting decision
15 Warwick Way London SW1V 1QT
Installation of a new shopfront.
-
26/06297/FULL Awaiting decision
15 Warwick Way London SW1V 1QT
Alterations to rear elevation at basement level comprising repolacement window and installation of double opening door.
-
26/06234/FULL Awaiting decision
40 Grosvenor Place London SW1X 7HJ
Use of lower ground floor of Unit 3 and ground floor of Unit 2 as gym (Class E(d)) and/ or office (Class E(g))
-
26/06249/FULL Awaiting decision
53 Wimpole Street London W1G 8YH
Removal and Installation of external rear air condensers and associated pipe work to ground floor, including internal works to ground and first floor. (Linked with 26/06250/LBC)
-
26/03576/FULL Decided
15A Devonshire Terrace London W2 3DW
Erection of an infill extension to basement courtyard to form new bedroom and internal alterations. (Linked with 26/03577/LBC)