1 Marylebone Street London W1G 8JA Data via plota.co.uk

25/08142/FULL - Full Planning Permission Application Approved

Proposal

Installation of an air source heat pump within the external courtyard at rear lower ground floor level. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
7 Nov 2025
✓
Consultation
19 Feb 2026
✓
Approved
30 Apr 2026

Approved on 30 Apr 2026 · Delegated Decision · Last checked 10 Oct 2026

Documents 19

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 30 Apr 2026 View ↗ PDF DELEGATED REPORT Report · 30 Apr 2026 View ↗

Statements & assessments 2

PDF NOISE IMPACT ASSESSMENT Noise impact assessment · 7 Nov 2025 View ↗ PDF PLANNING AND SUSTAINABLE DESIGN STATEMENT Other · 7 Nov 2025 View ↗

Plans & drawings 5

PDF LOCATION PLAN Location Plan · 7 Nov 2025 View ↗ PDF LIGHTWELL PLANS AND ELEVATIONS EXISTING AND PROPOSED Drawing · 7 Nov 2025 View ↗ PDF ELEVATION (FRONT) - PROPOSED_INCLUDED_IN_ELEVATION (FRONT) - EXISTING Superseded document · 7 Nov 2025 View ↗ PDF FLOOR PLAN_INCLUDED_IN_ELEVATION (FRONT) - EXISTING Superseded document · 7 Nov 2025 View ↗ PDF FLOOR PLAN - EXISTING_INCLUDED_IN_ELEVATION (FRONT) - EXISTING Superseded document · 7 Nov 2025 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 7 Nov 2025 View ↗ PDF FEECALCULATION Background Papers · 7 Nov 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 19 Feb 2026 View ↗

Other documents 7

PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 19 Feb 2026 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 19 Feb 2026 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 19 Feb 2026 View ↗ PDF RECEIPT OF APPLICATION Other · 13 Nov 2025 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 7 Nov 2025 View ↗ PDF SITELOCATION Background Papers · 7 Nov 2025 View ↗ PDF COVER LETTER Other · 7 Nov 2025 View ↗

All documents on the council site ↗

Site constraints 10

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 ↗
Town centre: Marylebone High Street
A designated centre in the London Plan.
Shops, services and active frontages are protected in centres, and main town centre uses are steered here first.
21 listed buildings within 150 m
Nearest: Crofton House, Grade II, 3 m away · 1 Grade II*, 20 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 21 with distances
Historic England ↗
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 262 m away: London Strategic Heat Main Project, at pre-application; Registered park or garden 227 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.
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 area120 m² (1,292 sq ft)
Energy ratingC (72 out of 100)
PropertyFlat, 4 habitable rooms
Built1900 to 1929
HeatingElectric storage heaters
WallsSolid brick, with internal insulation

From the energy performance certificate lodged in May 2026, 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
W1G 8JA
Received
7 Nov 2025
Validated
7 Nov 2025
Ward
Marylebone
Case officer
Show
Target decision
1 May 2026
Decision
Application Permitted
Decision date
30 Apr 2026
Decision level
Delegated Decision
Applicant
Show
Agent
The Howard De Walden Estate

How this decision compares

Decided in 174 days from validation, 98 days slower than Westminster's median of 76 for full applications. Approved, as 86% of full applications here are.

35%decided within 8 weeks
86%approved
2,198decided in the last year

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

Public comments

No public comments yet.

104 neighbours consulted · Last counted 10 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14427624
Planning Portal ref
PP-14427624
Comments by
25 Mar 2026
Site or press notice
19 Feb 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 Refused
Basement And Ground Floor 10 Marylebone High Street London W1U 4BT
Display of non-illuminated fascia sign measuring 0.60m x 0.15m and internally illuminated…
25/06190/ADV
2025
8 Marylebone High Street London W1U 4NN
Display of non illuminated hoarding sign measuring 4.14m x 7.02m for a temproary period f…
25/08120/ADV
2025
Crofton House 1 New Cavendish Street London W1G 8US
Refurbishment works to flat 7 the existing flat including formation of new kitchen and ba…
25/07065/LBC
2025
Crofton House 1 New Cavendish Street London W1G 8US
Refurbishment works to flat 7 the existing flat including formation of new kitchen and ba…
25/07064/FULL
2025
17 New Cavendish Street London W1G 9UA
Variation of condition 2 of planning permission dated 12th February 1998 (RN:97/05508/FUL…
25/06483/FULL
2025 Approved
Flat 15 Maybury Court Marylebone Street London W1G 8JF
Replacement of single-glazed timber casement windows with like-for-like timber casement w…
25/04436/FULL
2025 Approved
Basement And Ground Floor 37 Thayer Street London W1U 2QY
Display of one externally illuminated fascia sign measuring 0.425m x 19.6m.
25/05159/ADV
2025 Withdrawn
Marylebone Library 9 New Cavendish Street London W1G 9UQ
Use of two existing car parking spaces for placement of a parklet (which is not fixed to…
25/03439/FULL
2025
Marylebone Library 9 New Cavendish Street London W1G 9UQ
Provision of a public parklet replacing two existing car parking spaces for a temporary p…
25/04977/FULL
2025
120 Marylebone Lane London W1U 2QG
Installation of external stair at roof level.
25/02654/FULL
2025
98 - 101 Marylebone High Street London W1U 4SD
Raising the lintel of door to rear elevation.
25/02184/FULL
2025 Approved
31 New Cavendish Street London W1G 9TT
Display of non-illuminated fascia sign measuring 1200mm x 315mm, and non illuminated proj…
25/01214/ADV
2025
8 Marylebone High Street London W1U 4NN
Temporary hoarding graphics measuring 7020mm x 4140mm
25/00831/ADV
2025
16 De Walden Street London W1G 8RN
Variation of condition 1 of planning permission dated 7th October 2024 (RN:24/04641/FULL)…
25/00187/FULL
2024
11 Cross Keys Close London W1U 2DJ
The removal of window glazing and the installation of louvred vents on the first floor of…
24/08968/FULL
2024
8 Marylebone High Street London W1U 4NN
Display of an internally illuminated hanging sign measuring 0.45m x 0.85m. (SPLIT DECISIO…
24/08620/ADV
2024
8 Marylebone High Street London W1U 4NN
Installation of replacement shopfront including removal of the existing automatic sliding…
24/08274/FULL
2024
8 Marylebone High Street London W1U 4NN
Display of an externally illuminated fascia sign measuring 0.36m x 2.51m and an internall…
24/08301/ADV
2024 Approved
7 Marylebone High Street London W1U 4NL
Display of halo illuminated (letters only) fascia sign measuring 1.30m x 0.20m
24/07339/ADV
2024
7 Marylebone High Street London W1U 4NL
Replacement timber shopfront with inset louvres
24/07338/FULL
2019 Approved
110 Marylebone High Street London W1U 4RY
Variation of Condition 1 of planning permission dated 24 May 2018 (RN: 17/01347) for alte…
19/04876/FULL
2019 Approved
105 Marylebone High Street London W1U 4RS
Display of internally illuminated (letters only) projecting sign measuring 0.2m x 0.1m x…
19/06979/ADV
2019 Approved
32-34 New Cavendish Street London W1G 8UB
Installation of two new air conditioning units, and associated pipeworks, within lower gr…
19/05470/FULL
2019 Approved
Ground Floor 15 Marylebone High Street London W1U 4NU
Replacement shopfront.
19/05413/FULL
2019 Approved
Ground Floor 15 Marylebone High Street London W1U 4NU
Display of halo illuminated fascia sign (letters only) measuring 0.14m x 2.50m and an int…
19/05414/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

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.