Flat 2 5 Montagu Square London W1H 2LA Data via plota.co.uk

26/04419/LBC - Listed Building Consent Application Approved
Extensions & alterationsListed buildings

Proposal

Installation of secondary glazing to existing historic single glazed timber windows. Replacement of existing window with new timber double glazed unit. (Linked with 26/04418/FULL) Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
3 Jul 2026
✓
Approved
24 Aug 2026

Approved on 24 Aug 2026 · Delegated Decision · Last checked 26 Aug 2026

Documents 4

Decision & officer reports 2

PDF GRANT OF LISTED BUILDING CONSENT [PE] Decision Notice · 24 Aug 2026 View ↗ PDF DELEGATED REPORT Report · 24 Aug 2026 View ↗

Other documents 2

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 21 Jul 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 6 Jul 2026 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 11

Grade II listed: 1-5, Montagu Square W1
List entry 1223086 · The pin is inside its outline · 37 more listed buildings within 150 m (1 Grade I, 36 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 ↗
Portman Estate 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 Named permitted development rights are withdrawn here.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.
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.
Also on the record
National infrastructure project 165 m away: London Strategic Heat Main Project, at pre-application; Registered park or garden 202 m away: Portman Square and Manchester Square; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Tree preservation order 22 m away: STM3_A2; Town centre 77 m away: Baker Street (part).
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 area76 m² (818 sq ft)
Energy ratingD (61 out of 100), could reach C
PropertyMid-terrace flat, 3 habitable rooms
BuiltBefore 1900
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in October 2020, 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
W1H 2LA
Received
3 Jul 2026
Validated
3 Jul 2026
Ward
Marylebone
Case officer
Show
Target decision
28 Aug 2026
Decision
Application Permitted
Decision date
24 Aug 2026
Decision level
Delegated Decision
Applicant
Show
Agent
MDB Associates
Freehold owner
Show

How this decision compares

Decided in 52 days from validation, about the council's usual 55 days. 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 26 Aug 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14787222
Planning Portal ref
PP-14787222
Comments by
19 Aug 2026
Site or press notice
29 Jul 2026
Env. assessment
No

Historical activity at this location

26 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2023 Approved
Like for like replacement of a de-bonded Lath and Plaster ceiling to the living room.
23/00372/LBC
Within ~100m

Nearby activity

2025
1 Montagu Square London W1H 2LA
Installation of 1 Portland Stone step to match existing; Installation of Helifix Bars int…
25/06616/LBC
2025
1 Gloucester Place Mews London W1U 8BA
Removal of the existing asphalt flat roof at first floor level and installation of a vent…
25/06633/FULL
2025 Approved
Flat 4 58 Montagu Square London W1H 2LS
Internal alterations to flat at fourth floor level including installation of a spiral sta…
25/04771/LBC
2025
Flat 2 13 Montagu Street London W1H 7EX
Installation of airbrick to front elevation, new secondary glazing, reconfiguration, acou…
25/04426/LBC
2025
Flat 2 13 Montagu Street London W1H 7EX
Installation of airbrick to front elevation, new secondary glazing, reconfiguration, acou…
25/04425/FULL
2025
Flat 3 12 Montagu Square London W1H 2LD
Replace existing rear door with hardwood double doors with fan light over and fixed side…
25/02495/LBC
2024
Flat 1 58 Montagu Square London W1H 2LS
Creation of a WC, aligning the doors of the flat and minor internal layout amendments.
24/08812/LBC
2024
Flat 3 17 Montagu Square London W1H 2LE
Replacement of main flat door, door entrance of flat 4 above, three casement windows to t…
24/08803/FULL
2024
Flat 3 17 Montagu Square London W1H 2LE
Replacement of main flat door, door entrance of flat 4 above, three casement windows to t…
24/08804/LBC
2024
Flat 1 1 Montagu Square London W1H 2LA
Tanking works to the existing pavement vault and scullery
24/08556/LBC
2024 Approved
Flat 1 8 Montagu Square London W1H 2LB
Installation of air conditioning units within enclosure within rear lower ground floor le…
24/07049/LBC
2024
20 Gloucester Place Mews London W1U 8BA
Alterations to the street elevation, including the enlargement and replacement of the gro…
24/07854/FULL
2024 Approved
47 Gloucester Place London W1U 8JE
Internal alterations, fire protection to the single staircase from the lower ground floor…
24/01596/LBC
2024 Approved
30 Gloucester Place London W1U 8PL
Use of part ground and part lower ground floor as dual alternative use as office (Class E…
24/02433/FULL
2024 Approved
Flat 2 16 Montagu Street London W1H 7EX
Replacement of all windows to double glazed units.
24/01344/FULL
2024
47 Gloucester Place London W1U 8JE
Installation of fire curtains/barriers at ground floor level and half landing between gro…
24/03625/LBC
2024 Approved
27 Gloucester Place London W1U 8HU
Replacement of two conservation rooflights with rooflight windows.
24/01707/LBC
2024 Approved
27 Gloucester Place London W1U 8HU
Replacement of two conservation rooflights with rooflight windows.
24/01706/FULL
2023 Approved
30 Gloucester Place London W1U 8PL
Replacement modern double glazed Georgian Style sash windows to match the existing sash w…
23/06165/LBC
2024
12 Gloucester Place Mews London W1U 8BA
Erection of single storey front extension at ground floor level to enlarge dwelling (Clas…
24/02870/FULL
2018 Approved
8 Gloucester Place Mews London W1U 8BA
Replacement windows and front door.
18/10881/FULL
2019
89 George Street London W1U 8NL
Variation of condition 1 and 2 and removal of 3 and 4 of listed building consent dated 27…
19/01573/LBC
2019
60 Montagu Square London W1H 2LT
Removal of existing modern conservatory and replacement at first floor level by new exten…
19/01329/LBC
2019
60 Montagu Square London W1H 2LT
Removal of existing modern conservatory and replacement at first floor level by new exten…
19/01328/FULL
2018 Withdrawn
8 Gloucester Place Mews London W1U 8BA
Replacement of windows and front door. (Linked to 18/10881/FULL)
18/10882/LBC
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.

Freehold owner: Information produced by HM Land Registry. © Crown copyright 2026. Source: HM Land Registry, UK and overseas companies that own property in England and Wales, September 2026 release.