Planning application
Roxburghe House 273 - 287 Regent Street London W1B 2HA
Works: Extension Windows or glazing
Relates to 26/05749/LBC
Still open. Anyone can comment while the consultation period runs, and comments go to the council rather than to us.
Proposal
Refurbishment and extension of Roxburghe House and 39 and 40 Margaret Street, including new stair and lift core extension, UKPN substation and the introduction of a rooftop terrace, pavilion and plant enclosure to each building; replacement of windows, shopfronts and new office entrance from Margaret Street and associated ancillary works; and associated works with the use of the buildings as Class E(g) at part basement, part ground floor and upper floors and Class E(a)(b)(c) at part ground and part basement levels. (Linked with 26/05749/LBC)
As published by the council, reference 26/05748/FULL
Application record
- Reference
- 26/05748/FULL
- Category
- Full applications
- Status
- Pending
- Received
- 21 Aug 2026
- Validated
- 21 Aug 2026
- Postcode
- W1B 2HA
Site history
Applications at this address on the Westminster register
This site has had 2 applications since 2026.
-
26/05749/LBC Awaiting decision
Roxburghe House 273 - 287 Regent Street London W1B 2HA
Refurbishment and extension of Roxburghe House and (unlisted) 39 and 40 Margaret Street, including new stair and lift core extension, UKPN substation and creation of localised openings in party walls to link the buildings; replacement of windows; internal and external improvements to upgrade the existing building fabric and introduction of core extension and plant enclosures at roof level of the buildings; facade cleaning; and associated ancillary works. At Roxburghe House: creation of rooftop terrace and pavilion; alterations to entrances; and lowering of some roof level windows. At Margaret Street (unlisted): replacement of ground floor slab, upward extension of the building and chimneys to provide an additional floor, plus creation of a roof terrace and pavilion at level 05; a new office entrance with glazed frontage, extension behind rear façade; and associated ancillary works. (Linked with 26/05748/FULL)
Timeline
Dates from the published record
-
21 Aug 2026
Received by Westminster
-
1 Sep 2026
Added to PlanIndex
-
Decision
Awaiting decision
Decision expected by 16 October 2026, 8 weeks from validation under the statutory target for most applications. Extensions of time are common and are agreed case by case.
Westminster took a median of 61 days over the applications it decided in the last year.
Related applications
Cases linked to this one on the register
-
26/05749/LBC Awaiting decision
Roxburghe House 273 - 287 Regent Street London W1B 2HA
Refurbishment and extension of Roxburghe House and (unlisted) 39 and 40 Margaret Street, including new stair and lift core extension, UKPN substation and creation of localised openings in party walls to link the buildings; replacement of windows; internal and external improvements to upgrade the existing building fabric and introduction of core extension and plant enclosures at roof level of the buildings; facade cleaning; and associated ancillary works. At Roxburghe House: creation of rooftop terrace and pavilion; alterations to entrances; and lowering of some roof level windows. At Margaret Street (unlisted): replacement of ground floor slab, upward extension of the building and chimneys to provide an additional floor, plus creation of a roof terrace and pavilion at level 05; a new office entrance with glazed frontage, extension behind rear façade; and associated ancillary works. (Linked with 26/05748/FULL)
1 later application on the register refers to this one:
-
26/05749/LBC Awaiting decision
Roxburghe House 273 - 287 Regent Street London W1B 2HA
Refurbishment and extension of Roxburghe House and (unlisted) 39 and 40 Margaret Street, including new stair and lift core extension, UKPN substation and creation of localised openings in party walls to link the buildings; replacement of windows; internal and external improvements to upgrade the existing building fabric and introduction of core extension and plant enclosures at roof level of the buildings; facade cleaning; and associated ancillary works. At Roxburghe House: creation of rooftop terrace and pavilion; alterations to entrances; and lowering of some roof level windows. At Margaret Street (unlisted): replacement of ground floor slab, upward extension of the building and chimneys to provide an additional floor, plus creation of a roof terrace and pavilion at level 05; a new office entrance with glazed frontage, extension behind rear façade; and associated ancillary works. (Linked with 26/05748/FULL)
What happens while it is decided
This application is with Westminster for determination, against a statutory target of eight weeks. Over the last year Westminster decided full applications in a median of 85 days. More in our guide to how long planning decisions take.
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
-
Roxburghe House 273 - 287 Regent Street London W1B 2HA
90% historically approved · decision due ~16 Oct
Refurbishment and extension of Roxburghe House and (unlisted) 39 and 40 Margaret Street, including new stair and lift core extension, UKPN substation and creation of localised openings in party walls to link the buildings; replacement of windows; internal and external improvements to upgrade the existing building fabric and introduction of core extension and plant enclosures at roof level of the buildings; facade cleaning; and associated ancillary works. At Roxburghe House: creation of rooftop terrace and pavilion; alterations to entrances; and lowering of some roof level windows. At Margaret Street (unlisted): replacement of ground floor slab, upward extension of the building and chimneys to provide an additional floor, plus creation of a roof terrace and pavilion at level 05; a new office entrance with glazed frontage, extension behind rear façade; and associated ancillary works. (Linked with 26/05748/FULL)
Awaiting decision Heritage and listed buildings Extension Windows or glazing -
21 - 22 Great Castle Street London W1G 0HY
Display for a temporary period of six months of a non-illuminated 'to let' board located at a height of between 3.0m x 4.6m above pavement level and measuring 1.1m x 0.9m.
Granted Advertising 10 docs -
Walmar House 296 Regent Street London W1B 3AP
90% historically approved · decision due ~3 Mar
Installation of new rotating entrance door and accessible door; removal of existing sliding entrance doors and internal lobby doors; installation of air curtain, new flooring, new lighting fixtures and new security gate. [Linked to 26/00056/FULL]
Awaiting decision Heritage and listed buildings 22 docs -
Walmar House 296 Regent Street London W1B 3AP
87% historically approved · decision due ~3 Mar
Installation of new rotating entrance door and accessible door; removal of existing sliding entrance doors and internal lobby doors; installation of air curtain, new flooring, new lighting fixtures and new security gate. [Linked to 26/00057/LBC]
Awaiting decision Full applications 22 docs -
33 Margaret Street London W1G 0JD
90% historically approved · decision due ~24 Mar
Cleaning of the elevations fronting onto Regent Street and Margaret Street using facade gommage.
Awaiting decision Heritage and listed buildings 14 docs -
Marcol House 289 - 293 Regent Street London W1B 2HJ
Variation of condition 4 of planning permission dated 08 January 2024 (RN: 23/07854/FULL) for use of the public highway for the placing of 7 tables and 28 chairs in three areas measuring 6.9m x 1.3m (Margaret Street frontage), 6.9m x 1.2m and 1.9m x 1.2m (Regent Street frontage) in connection with existing restaurant/bar; NAMELY, to allow continued use until 31 December 2027 (Application under Section 73 of the Act)..
Granted Full applications 12 docs
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