Basement And Ground Floor Masionette 3 Upper Brook Street London W1K 6PA Data via plota.co.uk

26/03248/LBC - Listed Building Consent Application Approved
Extensions & alterationsListed buildings

Proposal

Replacement of existing front elevaiton sash windows with slimline double-glazed heritage units together with minor repair and redecoration of existing facade and existing front doors; replacement of windows and doors in rear modern extension and internal lightwell along with formation of a new window opening. (Linked with 26/03247/FULL) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
18 May 2026
✓
Validated
28 May 2026
✓
Approved
31 Jul 2026

Approved on 31 Jul 2026 · Delegated Decision · Last checked 7 Aug 2026

Documents 4

Decision & officer reports 2

PDF GRANT OF LISTED BUILDING CONSENT [PE] Decision Notice · 31 Jul 2026 View ↗ PDF DELEGATED REPORT Report · 31 Jul 2026 View ↗

Other documents 2

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 18 Jun 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 21 May 2026 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 11

Grade II listed: 3, Upper Brook Street W1
List entry 1221643 · The pin is inside its outline · 37 more listed buildings within 150 m (1 Grade I, 3 Grade II*, 33 Grade II)
Listed building consent is needed for work that affects the special interest of a listed building, inside or out, on top of planning permission. Setting can be a consideration for buildings nearby; there is no fixed radius.
Show the other 37 with distances
Historic England ↗
Mayfair conservation area
Demolition needs planning permission and permitted development is restricted.
The council must give weight to preserving or enhancing the area's character and appearance. Not every council has published its boundaries as open data.
Council document ↗
Article 4 direction
Article 4 Basement Development Permitted Rights Removed. Named permitted development rights are withdrawn here.
An Article 4 direction withdraws particular permitted development rights, so work that would normally need no application needs one here. Not every council has published its directions.
Archaeological priority area: City of Westminster APA 2.5
An assessment or field evaluation may be asked for before ground works.
The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.
Air quality management area: Westminster AQMA
The council has declared the area as failing an air quality objective.
Schemes that add traffic, parking or combustion plant are assessed against the area's action plan and may need an air quality assessment.
Council record ↗
Central activities zone
The core of central London in the London Plan.
Offices, culture and the other strategic functions of the centre take priority over new housing here.
Registered park or garden 63 m away: Grosvenor Square
Its setting is a consideration for work nearby.
Registered parks and gardens, battlefields, world heritage sites and protected wrecks are designated heritage assets: harm needs clear and convincing justification.
Historic England ↗
Also on the record
National infrastructure project 1700 m away: Thames Tideway Tunnel; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Town centre 38 m away: West End.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 2 November 2026. Historic England, the Environment Agency, Natural England, the Planning Inspectorate, Transport for London (public transport access levels, Powered by TfL Open Data, OGL v3.0, contains OS data © Crown copyright and database right 2025) and council datasets, Open Government Licence. A boundary can run through a site and the council holds the definitive record: confirm with the council before relying on this.

Building

Floor area149 m² (1,604 sq ft)
Energy ratingD (56 out of 100), could reach C
PropertyMid-terrace maisonette, 5 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in September 2012, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council
Westminster
Application type
Listed Building Consent Application
Postcode
W1K 6PA
Received
18 May 2026
Validated
28 May 2026
Ward
West End
Case officer
Show
Target decision
23 Jul 2026
Decision
Application Permitted
Decision date
31 Jul 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Echlin

How this decision compares

Decided in 64 days from validation, 9 days slower than Westminster's median of 55 for extensions. Approved, as 88% of extensions here are.

56%decided within 8 weeks
88%approved
1,937decided in the last year

Plota live figures for extensions decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

No public comments yet.

Last counted 7 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14909124
Planning Portal ref
PP-14909124
Comments by
15 Jul 2026
Site or press notice
24 Jun 2026
Env. assessment
No

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025
21 Lees Place London W1K 6LR
Partial demolition; basement excavation; replacement ground floor frontage; creation of a…
25/06937/FULL
2025 Withdrawn
21 Lees Place London W1K 6LR
Partial demolition and excavation of a new lower ground floor level; installation of a re…
25/06741/FULL
2025 Approved
30 Grosvenor Square London W1K 6AN
Display of non-illuminated sign on main entrance canopy measuring 0.2m x 3.78m
25/04508/ADV
2025 Approved
30 Grosvenor Square London W1K 6AN
Amendments to the Basement Level 1 internal layout
25/04210/LBC
2025
80 Park Street London W1K 6NQ
Alterations to the main entrance to include replacement of the external entrance door; re…
25/03677/FULL
2025
5 Lees Place London W1K 6LH
T1 - Flowering Cherry - fell to ground level & chemically treat stump to prevent regrowth…
25/02157/TCA
2025
Shepherd Close London
This has been discussed with Barbara Milne. G1260 ? 3 x Pyracantha & 3 x Common Fig Recom…
25/01323/TCA
2025 Approved
Shepherd Close London
4 x limes (T1256, T1257, T1258 & T1259): Reduce crowns to previous most recent reduction…
25/00105/TCA
2024
96 Park Street London W1K 6NY
Erection of single-storey roof extension to enlarge the existing fourth floor flats inclu…
24/09049/FULL
2024
21 Lees Place London W1K 6LR
Amalgamation of two existing two-bedroom flats located on first and second floors of the…
24/08789/FULL
2024 Approved
American Embassy 24 - 31 Grosvenor Square London W1K 6AH
1 x London plane (T10): Crown lift/ cut back to provide 1.5m height and lateral clearance…
24/06838/TCA
2024 Approved
2 Shepherd Close London W1K 6EA
Alterations to the windows on the front elevation; installation of photovoltaic panels at…
24/04095/FULL
2023 Approved
Development Site At 1 Lees Place, 43 North Audley Street And 22 Grosvenor Square London W1K 6DT
Relocation of Sheffield cycle stands and the use of the highway for the placing of 9 tabl…
23/06321/TCH
2024
American Embassy 24 - 31 Grosvenor Square London W1K 6AH
Installation of permanent external planter boxes at ground floor level of Grosvenor Squar…
24/05112/FULL
2024
American Embassy 24 - 31 Grosvenor Square London W1K 6AH
Variation of conditions 1 and 46 of planing permission dated 18.02.2021 (RN: 20/06601/FUL…
24/05111/FULL
2024
59 Green Street London W1K 6RZ
Reconfiguration of existing rear extensions, rear light well including rear extension, ea…
24/04360/FULL
2024
American Embassy 24 - 31 Grosvenor Square London W1K 6AH
Installation of CCTV cameras on all elevations of the building at ground to second and se…
24/01390/LBC
2024
American Embassy 24 - 31 Grosvenor Square London W1K 6AH
Installation of CCTV cameras on all elevations of the building at ground to second and se…
24/01389/FULL
2021 Approved
Development Site At 1 Lees Place, 43 North Audley Street And 22 Grosvenor Square London W1K 6DT
Variation of condition 1 of planning permission dated 04 March 2021 (RN: 20/05720/FULL) w…
21/04928/FULL
2023 Approved
Blackburne House 1A Culross Street London W1K 2DL
Excavation of a basement beneath 1A Culross Street and two vents at roof level (Blackburn…
23/05900/FULL
2018 Approved
American Embassy 24-31 Grosvenor Square London W1K 6AH
Variation of Condition 1 of listed building consent dated 12 September 2017 (RN: 16/06463…
18/03517/LBC
2018 Approved
32-34 North Audley Street London W1K 6ZG
Variation of Condition 9 and 11 of planning permission dated 1 November 2017 (RN: 17/0422…
18/05272/FULL
2018 Approved
Development Site At 22 Grosvenor Square, 43 North Audley Street And 1 Lees Place London W1K 6DT
Variation of condition 1, 32, and 35 of planning permission dated 26 September 2017 (RN…
18/03455/FULL
2018 Approved
Development Site At 22 Grosvenor Square, 43 North Audley Street And 1 Lees Place London W1K 6DT
Variation of condition 1 of listed building consent dated 26 September (RN: 17/05808/LBC)…
18/03461/LBC
2018 Approved
11 Upper Brook Street London W1K 6PB
Display for a temporary period of six months of a non-illuminated estate agent board loca…
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Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Other decisions

Westminster is slower than most councils at deciding householder applications, ranking #258 out of 296. Only 28% of applications have the time limit extended, well below the 41% national average - the council usually decides on time. Westminster is also one of the strictest councils - it refuses more householder applications than almost any other, with only 81% approved vs 90% nationally.

One of the strictest councils
only 81% approved vs 90% nationally
These figures are council-wide context, not a prediction for this application. View full council performance
Westminster decision statistics
Based on MHCLG data, the year to March 2026
86%
Overall approval rate
Below avg (87%) #201 of 296
81%
Householder approved
Below avg (90%) #277 of 296
44%
Decided in 8 weeks
Below avg (63%) #258 of 296
28%
Extended time limit
Below avg (41%) #46 of 296
83%
Minor dwellings approved
12 decided (1-9 homes)
67%
Major dwellings approved
3 decided (10+ homes)
81%
Change of use approved
133 decided
4,602
Total decisions
648 refused in the year to March 2026
Source: MHCLG planning statistics · See full council rankings

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

Energy performance: Energy performance certificates from the Energy Performance of Buildings Register, Ministry of Housing, Communities and Local Government. Contains public sector information licensed under the Open Government Licence v3.0. © Crown copyright 2026.