21 Montagu Street London W1H 7EX Data via plota.co.uk

25/08812/FULL - Full Planning Permission Application Approved
Extensions & alterationsUtility infrastructure

Proposal

Installation of new external vent and timber louvred door in lightwell (21-22 Montagu Street). Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
4 Dec 2025
✓
Validated
24 Apr 2026
✓
Consultation
30 Apr 2026
✓
Approved
8 Jun 2026

Approved on 8 Jun 2026 · Delegated Decision · Last checked 25 Sept 2026

Documents 15

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 8 Jun 2026 View ↗ PDF DELEGATED REPORT Report · 8 Jun 2026 View ↗

Statements & assessments 1

PDF NOISE IMPACT ASSESSMENT Noise impact assessment · 24 Apr 2026 View ↗

Plans & drawings 3

PDF LOCATION AND BLOCK PLAN Location Plan · 4 Dec 2025 View ↗ PDF EXISTING AND PROPOSED SECTIONS (21 MONTAGU STREET) Drawing · 4 Dec 2025 View ↗ PDF EXISTING AND PROPOSED SECTIONS (22 MONTAGU STREET) Drawing · 4 Dec 2025 View ↗

Application forms 2

PDF CORRECTED SITE DESCRIPTION Application Form · 2 Feb 2026 View ↗ PDF APPLICATIONFORMREDACTED Application Form · 4 Dec 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 30 Apr 2026 View ↗

Other documents 6

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 30 Apr 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 30 Apr 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 30 Apr 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 24 Mar 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 9 Mar 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 4 Dec 2025 View ↗

All documents on the council site ↗

Site constraints 7

Grade II listed: 20, Montagu Street W1
List entry 1267357 · 7 m away · 41 more listed buildings within 150 m (1 Grade I, 40 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 41 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
Registered park or garden 161 m away: Portman Square and Manchester Square; Inside the City of Westminster built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 25 September 2026. Historic England, the Environment Agency, Natural England 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.

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Other new applications on this street

21 Sept 2026Pending

51 Upper Montagu Street London W1H 1FQ

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17 Sept 2026Pending

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Replacement of an existing timber single-glazed sash windows with a timber sliml...

26/06369/LBC
21 Jul 2026Pending

Flat 1 8 Upper Montagu Street London W1H 2PB

Replacement of existing windows with timber slimline double-glazed windows, incl...

26/04890/LBC
15 May 2026Approved

26 Upper Montagu Street London W1H 1RP

Erection of a one and a half storey rear extension to enlarge HMO, installation ...

26/03214/FULL

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20 Aug 2026Pending

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17 Sept 2026Pending

Flat 4 8 Upper Montagu Street London W1H 2PB

Replacement of an existing timber single-glazed sash windows with a timber sliml...

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17 Sept 2026Pending

Flat 4 8 Upper Montagu Street London W1H 2PB

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18 Sept 2026Pending

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5 Aug 2026Pending

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Important details

Council
Westminster
Application type
Full Planning Permission Application
Postcode
W1H 7EX
Received
4 Dec 2025
Validated
24 Apr 2026
Ward
Marylebone
Case officer
Show
Target decision
19 Jun 2026
Decision
Application Permitted
Decision date
8 Jun 2026
Decision level
Delegated Decision
Applicant
Show
Agent
Quatrefoils Ltd

How this decision compares

Decided in 45 days from validation, 10 days faster than Westminster's median of 55 for extensions. Approved, as 88% of extensions here are.

56%decided within 8 weeks
88%approved
1,673decided 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.

25 neighbours consulted · Last counted 25 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14507855
Comments by
3 Jun 2026
Site or press notice
30 Apr 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 Approved
Rutland Court 64 Upper Berkeley Street London W1H 7QT
Installation of a single wrought iron gate at the entrance to the passageway leading to a…
25/06129/FULL
2025 Approved
26 Montagu Mews South London W1H 7ES
Replacement of garage doors with timber windows.
25/05187/FULL
2025
Basement And Ground Floor 67 Upper Berkeley Street London W1H 7QX
Display for a temporary period of six months of a non-illuminated estate agent board loca…
25/07459/AD7
2025
Basement And Ground Floor 67 Upper Berkeley Street London W1H 7QX
Display for a temporary period of six months of a non-illuminated estate agent board loca…
25/07458/AD7
2025
Flat 2 68 Upper Berkeley Street London W1H 7QY
Internal alterations to the first floor flat with the inclusion of a new boiler flue pene…
25/06603/LBC
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 Approved
8 Montagu Mews South London W1H 7ER
Gas meter relocation to the front facade
25/04796/FULL
2025 Withdrawn
26 Montagu Mews South London W1H 7ES
Alteration of existing coach house/garage to kitchen and living room with new painted tim…
25/04074/CLOPUD
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 Approved
68 Great Cumberland Place London W1H 7TX
1 x Japanese maple (T2): Reduce all round by approx. 1m, leaving furnishing growth . Thin…
25/03179/TCA
2025
Flat 4 1 Bryanston Square London W1H 2DH
Internal alterations including new partitions, joinery and cornices, kitchen and bathroom…
25/01336/LBC
2025
12 Upper Berkeley Street London W1H 7QD
Display for a temporary period of six months of a non-illuminated estate agent board atta…
25/01287/AD7
2025
Flat 7 1 Bryanston Square London W1H 2DH
Replacement of two rooflights and two crittal windows with timber box sash windows and re…
25/01181/LBC
2024
3 Brunswick Mews London W1H 7FB
Erection of new mansard roof extension.
24/08923/FULL
2024
Flat 1 1 Montagu Square London W1H 2LA
Tanking works to the existing pavement vault and scullery
24/08556/LBC
2024 Approved
Flat 2 16 Montagu Street London W1H 7EX
Replacement of all windows to double glazed units.
24/01344/FULL
2023 Refused
Flat 2 1A Bryanston Square London W1H 2DH
Installation of 5 new windows. (Linked to 23/00844/FULL)
23/00793/LBC
2017 Withdrawn
14 Montagu Street London W1H 7EX
Installation of an internal lift from ground to second floor level, installation of new d…
17/07943/LBC
2017 Withdrawn
14 Montagu Street London W1H 7EX
Installation of an internal lift from ground to second floor level, installation of new d…
17/07942/FULL
2017 Approved
44-48 Great Cumberland Place London W1H 7BS
Variation of condition 3 of listed building consent dated 17.05.2016 for Erection of a ma…
17/06141/LBC
2017 Approved
1 Bryanston Square London W1H 2DH
Installation of kitchen ventilation grille to front elevation and internal alterations to…
17/06507/LBC
2017 Approved
Flat 1 1 Bryanston Square London W1H 2DH
Installation of ventilation grille on front facade at basement level
17/06506/FULL
Westminster
Planning Authority Score
3.5/10
Below average
#221 of 296 councils
Relevant to this application:
Householder 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