Rossetti House 106 - 110 Hallam Street London W1W 5HG Data via plota.co.uk

26/05425/NMA - Non-material amendments Approved
Extensions & alterations

Proposal

Amendments to planning permission dated 24 January 2025 (RN: ) for, "Replace windows with double glazed windows, convert two windows to AOV's in Staircase 1, convert two windows to fixed louvres in Staircase 2, replace water tanks on the roof, new insulated flat roof and dry riser inlet cabinet to be located on the Hallam Street elevation"; NAMELY to move the dry riser cabinet on the Hallam Street elevation. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
10 Aug 2026
✓
Approved
4 Sept 2026

Approved on 4 Sept 2026 · Delegated Decision · Last checked 5 Sept 2026

Documents 12

Decision & officer reports 2

PDF GRANT NON MATERIAL AMENDMENT Decision Notice · 4 Sept 2026 View ↗ PDF DELEGATED REPORT Report · 4 Sept 2026 View ↗

Plans & drawings 5

PDF SITE AND LOCATION PLANS Location Plan · 10 Aug 2026 View ↗ PDF HALLAM STREET ELEVATION - REFERENCE FOR DRY RISER CABINET LOCATION Drawing · 10 Aug 2026 View ↗ PDF PROPOSED DRY RISER INLET/OUTLET LOCATIONS Drawing · 10 Aug 2026 View ↗ PDF PROPOSED DRY RISER INLET CABINET Drawing · 10 Aug 2026 View ↗ PDF DRAWING ISSUE SHEET Drawing · 10 Aug 2026 View ↗

Application forms 1

PDF APPLICATIONFORMREDACTED Application Form · 10 Aug 2026 View ↗

Other documents 4

PDF ACK - NON-MATERIAL AMENDMENT Background Papers · 18 Aug 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 13 Aug 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 10 Aug 2026 View ↗ PDF COVER LETTER Background Papers · 10 Aug 2026 View ↗

All documents on the council site ↗

Associated applications 2

  • Part of

    Fullcouncil archive
    • AmendmentAmendments to planning permission dated 24 January 2025 (RN) for, "Replace windows with double…This application26/05425/NMA

Site constraints 8

Harley Street 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 ↗
2 Article 4 directions
Article 4 Basement Development Permitted Rights Removed · Article 4 Direction Class E To C3 In Central Activities Zone. Named permitted development rights are withdrawn here.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.
Registered park or garden 98 m away: Regent's Park
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
11 listed buildings within 150 m; Scheduled monument 186 m away: A subterranean commercial ice-well (City of Westminster), Park Crescent West, W1; Inside the City of Westminster built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt

Checked on 11 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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Important details

Council
Westminster
Application type
Non-material amendments
Postcode
W1W 5HG
Received
10 Aug 2026
Validated
10 Aug 2026
Ward
West End
Case officer
Show
Target decision
7 Sept 2026
Decision
Application Permitted
Decision date
4 Sept 2026
Decision level
Delegated Decision
Agent
ARCHER ARCHITECTS

How this decision compares

Decided in 25 days from validation, 28 days faster than Westminster's median of 53 for extensions. Approved, as 87% of extensions here are.

62%decided within 8 weeks
87%approved
930decided 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 5 Sept 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15140577
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

2024
Windows replacement (like for like) to flats, converting two existing windows to AOV's in…
24/07761/FULL
Within ~100m

Nearby activity

2025
53 Bolsover Street London W1W 5NG
Use of the lower ground and ground floor as residential (Class C3) to form 1 x 1 bedroom…
25/04830/FULL
2025
201 - 203 Great Portland Street London W1W 5AB
Use of Devonshire House and ground and upper floors of 201 Great Portland Street for eith…
25/04760/FULL
2025
53 Bolsover Street London W1W 5NG
Change of use of first floor office to single residential dwelling (Class C3).
25/04411/FULL
2025
Flat 1 94 Portland Place London W1B 1NZ
Installation of aluminum framed secondary glazing to the front and rear elevations.
25/01087/LBC
2024
209 Great Portland Street London W1W 5AH
Relocation of existing louvres from ground floor facade on Great Portland Street to Park…
24/08364/FULL
2024
8 Park Crescent London W1B 1PG
Roof maintenance works, including relaying of the flat roof system, removal, repair and r…
24/07253/LBC
2024
8 Park Crescent London W1B 1PG
Roof maintenance works, including relaying of the flat roof system, removal, repair and r…
24/07252/FULL
2024
10 Park Crescent Mews East London W1W 5AG
Replacement of windows
24/03908/FULL
2024
209 Great Portland Street London W1W 5AH
The proposed upgrade comprises the removal and replacement of 3no. existing antenna with…
24/01338/TELNOT
2023 Approved
Flat 3, 9 - 12 Park Crescent London W1B 1PG
Installation of one air conditioning unit at roof level (Linked with 23/06658/LBC)
23/06657/FULL
2023
Flat 4 8 Park Crescent London W1B 1PG
Replacement of an existing conservatory with a new structure on the same footprint with a…
23/07758/LBC
2023
Flat 4 8 Park Crescent London W1B 1PG
Replacement of an existing conservatory with a new structure on the same footprint with a…
23/07757/FULL
2023
Flat 3, 9 - 12 Park Crescent London W1B 1PG London W1B 1PG
Installation of one air conditioning unit located on roof terrace; Removal of internal pa…
23/06658/LBC
2023
209 Great Portland Street London W1W 5AH
Demolition of existing second and third floor of 211 Great Portland Street and erection o…
23/06612/FULL
2023 Approved
209 Great Portland Street London W1W 5AH
Installation of new items of plant to the rear of the Portland Hospital
23/02670/FULL
2023 Refused
59-61 Bolsover Street And 224-228 Great Portland Street London W1W 5QP
Provison of fire protection sprinkler tank, wall mounted box enclosing pipework and plant…
23/01119/FULL
2023 Approved
Third Floor 88 - 92 Baker Street London W1U 8TQ
Variation of condition 4 of planning permission dated 17th May 2022 (21/05257/TCH) for us…
23/01836/FULL
2023 Approved
240-242 Great Portland Street London W1W 5QU
Display of three internally illuminated menu boxes measuring 36.7cm x 28cm, 69.4cm x 52cm…
23/00984/ADV
2022 Approved
Flat 25 88 Portland Place London W1B 1NX
Replace windows at the rear with steel double glazed windows and kitchen door with extra…
22/00692/FULL
2022 Approved
Garages At Devonshire Row Mews London
Use of lower ground and ground floor level as Class E (e) medical space and/or Class E (g…
22/06882/FULL
2016 Approved
Flat 1 10 Park Crescent London
Minor alterations to wall and door openings
16/00311/LBC
2016 Approved
13-14 Park Crescent London W1B 1PQ
Display of advertising on a hoarding for a temporary period from the 1 April 2016 until t…
16/03237/ADV
2016 Approved
Flat 1 10 Park Crescent London
Installation of replacement windows on rear elevation and internal alterations. (Flat 1)
16/00241/FULL
2016 Approved
Flat 1 10 Park Crescent London
Installation of replacement windows on rear elevation and internal alterations. (Flat 1).
16/00242/LBC
2016 Approved
179 - 185 Great Portland Street London W1W 5LS
Display of non-illuminated fascia sign measuring 260mm x 2475mm.
16/01162/ADV
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