23 - 25 Chiltern Street London W1U 7PH Data via plota.co.uk

26/06923/FULL - Full Planning Permission Application Pending
Utility infrastructure

Proposal

Installation of two external air conditioning condenser units positioned on top of the existing bathroom roof within the rear lightwell. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
9 Oct 2026
✓
Validated
13 Oct 2026
Decision
Expected by 8 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision between 5 Dec 2026 and 15 Dec 2026, from Westminster's recent utility and infrastructure works.

Documents 16

Statements & assessments 3

PDF EXTERNAL CONDENSER UNIT ENVIRONMENTAL NOISE ASSESSMENT REPORT Noise impact assessment · 9 Oct 2026 View ↗ PDF DESIGN AND ACCESS STATEMENT Design and Access Statement · 9 Oct 2026 View ↗ PDF HERITAGE STATEMENT Heritage Statement · 9 Oct 2026 View ↗

Plans & drawings 7

PDF GROUND FLOOR PLAN - HVAC Drawing · 13 Oct 2026 View ↗ PDF EXISTING GROUND FLOOR PLAN Drawing · 13 Oct 2026 View ↗ PDF LOWER GROUND FLOOR PLAN - HVAC Drawing · 13 Oct 2026 View ↗ PDF EXISTING LOWER GROUND FLOOR PLAN Drawing · 13 Oct 2026 View ↗ PDF LOCATION PLAN Location Plan · 9 Oct 2026 View ↗ PDF LOWER GROUND FLOOR PLAN - HVAC Superseded document · 9 Oct 2026 View ↗ PDF GROUND FLOOR PLAN HVAC Superseded document · 9 Oct 2026 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 9 Oct 2026 View ↗ PDF FEECALCULATION Background Papers · 9 Oct 2026 View ↗

Other documents 4

PDF RECEIPT OF APPLICATION Other · 13 Oct 2026 View ↗ PDF 1ST INVALID LETTER Background Papers · 13 Oct 2026 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 9 Oct 2026 View ↗ PDF SITELOCATION Background Papers · 9 Oct 2026 View ↗

All documents on the council site ↗

Site constraints 9

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 ↗
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 Named permitted development rights are withdrawn here.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.
18 listed buildings within 150 m
Nearest: 28A, MANCHESTER STREET W1 (See details for further address information), Grade II, 29 m away · 18 Grade II
The site itself is not listed. 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 all 18 with distances
Historic England ↗
Also on the record
National infrastructure project 291 m away: London Strategic Heat Main Project, at pre-application; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Town centre 34 m away: Baker Street (part).
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 17 October 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 area211 m² (2,271 sq ft)
Energy ratingC (asset rating 67)
UseRetail/Financial and Professional Services
HeatingHeating and Natural Ventilation

From the energy performance certificate lodged in November 2023, 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
Full Planning Permission Application
Postcode
W1U 7PH
Received
9 Oct 2026
Validated
13 Oct 2026
Ward
Marylebone
Case officer
Show
Target decision
8 Dec 2026
Applicant
Show

Decision outlook

Day 7 of the 56-day target. Westminster usually decides utility and infrastructure works by day 57.

Day 750 days to the predicted decision (day 57)
49%decided within 8 weeks
90%approved
415decided in the last year

Plota live figures for utility and infrastructure works decided by Westminster in the last twelve months, from validation. Westminster decision record →

Public comments

No public comments yet.

Last counted 17 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-15275982
Planning Portal ref
PP-15275982
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
39 Manchester Street London W1U 7LJ
Waterproofing of underpavement vaults using cavity membrane system.
25/08149/LBC
2025 Approved
41 Manchester Street London W1U 7LN
Internal and external alterations, and installation of air source heat pump and plant mac…
25/04417/LBC
2025 Approved
36 Manchester Street London W1U 7LH
Alterations to existing two rooflights including installation of hanger joists and angle…
25/05271/FULL
2025 Approved
36 Manchester Street London W1U 7LH
Alterations to existing two rooflights including installation of hanger joists and angle…
25/05272/LBC
2025
27 Manchester Street London W1U 4DJ
Internal refurbishment, security and fire safety improvement works of the communal areas…
25/07056/LBC
2025
40 - 42 Chiltern Street London W1U 7QN
Display of two non-illuminated fascia signs each measuring 0.50m x 0.12m and a non-illumi…
25/06934/ADV
2025
40 - 42 Chiltern Street London W1U 7QN
Installation of two wall mounted electric heaters, four wall lamps and two awnings. (Link…
25/06933/FULL
2025 Approved
37 Chiltern Street London W1U 7PW
Display of graphic window vinyls on the ground floor windows at 37 Chiltern Street for a…
25/06011/ADV
2025 Approved
52 Dorset Street London W1U 7NQ
Installation of a replacement of roof light on the rear flat roof and installation of new…
25/03519/FULL
2025 Approved
44 Chiltern Street London W1U 7QP
Display of three vinyls on the external ground floor windows for a temporary period of on…
25/06012/ADV
2025 Approved
1 Chiltern Street London W1U 7PA
Reinstatement of roof structure, roof finishes and plant following fire on 14.02.25
25/05136/LBC
2025 Approved
1 Chiltern Street London W1U 7PA
Removal and replacement of all remaining pugging to 1st and 2nd floor soffits to facilita…
25/04762/LBC
2025 Withdrawn
52 Dorset Street London W1U 7NQ
Installation of a replacement of roof light on the rear flat roof and installation of new…
25/03520/LBC
2025 Approved
Flat 1 48 Blandford Street City Of Westminster London W1U 7HU
Internal alteration to flat 1 at first floor level, including upgrade to fire separation…
25/03949/LBC
2025 Refused
27 Manchester Street London W1U 4DJ
Internal refurbishment, security and fire safety improvement works of the communal areas…
25/04432/LBC
2025 Approved
55 Baker Street London W1U 8EW
Request for a screening opinion under Regulation 6 of the Town and Country Planning (Envi…
25/04654/EIASCR
2025
55 Baker Street London W1U 8EW
Refurbishment of the building including demolition of Level 08 and construction of Level…
25/04398/FULL
2025
62 - 64 Baker Street London W1U 7DF
Display of internally illuminated LCD portrait screen outside 66 - 70 Baker Street measur…
25/04161/ADV
2025
62 - 64 Baker Street London W1U 7DF
Installation of an open access Communication Hub outside 66 - 70 Baker Street, following…
25/04160/FULL
2025 Approved
52 - 55 Dorset Street London W1U 7NH
Shopfront alterations, internal fit out works, and replacement advertisements.
25/02110/LBC
2018 Approved
66 Baker Street London W1U 7DJ
Replacement and alterations of shopfront at 66 Baker Street and 45 Dorset Street.
18/05854/FULL
2018 Approved
40-42 Baker Street London W1U 7AJ
Use of two areas of the public highway measuring 9.49m x 1.35m on Baker Street frontage a…
18/04069/TCH
2018 Approved
66 Baker Street London W1U 7DJ
Display of internally illuminated fascia sign measuring 0.5m x 2m x 0.02m, and internally…
18/05855/ADV
2018 Approved
52 - 55 Dorset Street London W1U 7NH
Alterations at basement and ground floor levels including the installation of openable sh…
18/02823/LBC
2018 Approved
52 - 55 Dorset Street London W1U 7NH
Alterations at basement and ground floor levels including the installation of a partially…
18/02822/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

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.