5 - 7 Mandeville Place London W1U 3AT Data via plota.co.uk

25/04826/FULL - Full Planning Permission Application Approved

Proposal

Partial demolition and replacement of rear façade and closet wing, provision of new fenestration, creation of mansard extension to Dukes Mews, alterations to fenestration and detailing to front and rear façade, alterations to existing stair core, creation of rooflights and removal and reconfiguration of roof level plant. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
14 Jul 2025
✓
Approved
21 Oct 2025

Approved on 21 Oct 2025 · Delegated Decision · Last checked 28 Oct 2026

Documents 68

Decision & officer reports 2

PDF GRANT OF FULL PP [PE] Decision Notice · 21 Oct 2025 View ↗ PDF DELEGATED REPORT Report · 21 Oct 2025 View ↗

Statements & assessments 11

PDF FLOOD RISK ASSESSMENT Flood risk assessment · 23 Sept 2025 View ↗ PDF LEAD LOCAL FLOOD AUTHORITY COMMENT Other · 12 Aug 2025 View ↗ PDF DAS_PART1 OF 3 Design and Access Statement · 14 Jul 2025 View ↗ PDF DAS_PART2 OF 3 Design and Access Statement · 14 Jul 2025 View ↗ PDF DAS_PART3 OF 3 Design and Access Statement · 14 Jul 2025 View ↗ PDF HERITAGE STATEMENT Heritage Statement · 14 Jul 2025 View ↗ PDF NOISE ASSESSMENT Background Papers · 14 Jul 2025 View ↗ PDF FLOOD RISK REPORT Background Papers · 14 Jul 2025 View ↗ PDF SUSTAINABILITY STATEMENT Background Papers · 14 Jul 2025 View ↗ PDF PLANNING STATEMENT Background Papers · 14 Jul 2025 View ↗ PDF INTERNAL DAYLIGHT ASSESSMENT Background Papers · 14 Jul 2025 View ↗

Plans & drawings 41

PDF A0200_SITE LOCATION PLAN Drawing · 14 Jul 2025 View ↗ PDF A0201_BLOCK PLAN Drawing · 14 Jul 2025 View ↗ PDF DRAWING ISSUE SHEET Drawing · 14 Jul 2025 View ↗ PDF A0802_EXISTING SECTION CC Drawing · 14 Jul 2025 View ↗ PDF A2103_EXISTING PROPOSED SOUTH ROOF ELEVATION Drawing · 14 Jul 2025 View ↗ PDF A0700_EXISTING EAST (FRONT) ELEVATION Drawing · 14 Jul 2025 View ↗ PDF A0701_ EXISTING S N LIGHTWELL ELEVATIONS Drawing · 14 Jul 2025 View ↗ PDF A0702_EXISTING WEST (REAR) ELEVATION Drawing · 14 Jul 2025 View ↗ PDF A0599_EXISTING BASEMENT PLAN Drawing · 14 Jul 2025 View ↗ PDF A0600_EXISTING GROUND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A0601_EXISTING FIRST FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A0602_EXISTING SECOND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A0603_EXISTING THIRD FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A0604_EXISTING FOURTH FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A0605_EXISTING GALLERY PLAN Drawing · 14 Jul 2025 View ↗ PDF A0607_EXISTING ROOF PLAN Drawing · 14 Jul 2025 View ↗ PDF A1602_DEMOLITION SECTION CC Drawing · 14 Jul 2025 View ↗ PDF A1500_DEMOLITION EAST F ELEV Drawing · 14 Jul 2025 View ↗ PDF A1501_DEMOLTION S AND N LIGHTWELL ELEV Drawing · 14 Jul 2025 View ↗ PDF A1502_DEMOLITION WEST (REAR) ELEVATION Drawing · 14 Jul 2025 View ↗ PDF A1503_DEMOLITION SOUTH ROOF ELEVATION Drawing · 14 Jul 2025 View ↗ PDF A1399_DEMOLITION BASEMENT PLAN Drawing · 14 Jul 2025 View ↗ PDF A1400_DEMOLITION GROUND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A1401_DEMOLITION FIRST FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A1402_DEMOLITION SECOND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A1403_DEMOLITION THIRD FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A1404_DEMOLITION FOURTH FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A1405_DEMOLITION GALLERY PLAN Drawing · 14 Jul 2025 View ↗ PDF A1407_DEMOLITION ROOF PLAN Drawing · 14 Jul 2025 View ↗ PDF A2202_PROPOSED SECTION CC Drawing · 14 Jul 2025 View ↗ PDF A1999_PROPOSED BASEMENT PLAN Drawing · 14 Jul 2025 View ↗ PDF A2000_PROPOSED GROUND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A2001_PROPOSED FIRST FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A2002_PROPOSED SECOND FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A2003_PROPOSED THIRD FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A2004_PROPOSED FOURTH FLOOR PLAN Drawing · 14 Jul 2025 View ↗ PDF A2005_PROPOSED GALLERY PLAN Drawing · 14 Jul 2025 View ↗ PDF A2007_PROPOSED ROOF PLAN Drawing · 14 Jul 2025 View ↗ PDF A2100_PROPOSED EAST F ELEV Drawing · 14 Jul 2025 View ↗ PDF A2101_PROPOSED S AND N LIGHTWELL ELEV Drawing · 14 Jul 2025 View ↗ PDF A2102_PROPOSED WEST (REAR) ELEVATION Drawing · 14 Jul 2025 View ↗

Application forms 2

PDF APPLICATIONFORMREDACTED Application Form · 14 Jul 2025 View ↗ PDF FEECALCULATION Background Papers · 14 Jul 2025 View ↗

Consultation & comments 1

PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 22 Jul 2025 View ↗

Other documents 11

PDF ECNSLT-INTERNAL CONSULTS Background Papers · 7 Nov 2025 View ↗ PDF SITE NOTICE 21 OR 28 DAYS IF T&C APPL. Background Papers · 22 Jul 2025 View ↗ PDF ECNSLT-INTERNAL CONSULTS Background Papers · 22 Jul 2025 View ↗ PDF ECNSLT-INTERNAL CONSULTS Background Papers · 22 Jul 2025 View ↗ PDF ECNSLT-INTERNAL CONSULTS Background Papers · 22 Jul 2025 View ↗ PDF CNSLT-LA SOCIETY Background Papers · 22 Jul 2025 View ↗ PDF ACK-GENERAL LETTER (G/P/C) Background Papers · 22 Jul 2025 View ↗ PDF RECEIPT OF APPLICATION Other · 17 Jul 2025 View ↗ PDF 1ST INVALID LETTER Background Papers · 17 Jul 2025 View ↗ PDF ATTACHMENTSUMMARY Background Papers · 14 Jul 2025 View ↗ PDF COVERING LETTER VF Background Papers · 14 Jul 2025 View ↗

All documents on the council site ↗

Site constraints 10

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 ↗
34 listed buildings within 150 m
Nearest: Trinity College of Music, Grade II, 21 m away · 1 Grade I, 1 Grade II*, 31 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 34 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.
Registered park or garden 69 m away: Portman Square and Manchester Square
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
National infrastructure project 1837 m away: Thames Tideway Tunnel; Inside the City of Westminster built-up area; Public transport access: PTAL 6b (excellent), TfL 2023, for the 100 m square; Town centre 37 m away: Marylebone High Street.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 1 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 area1,419 m² (15,274 sq ft)
Energy ratingD (asset rating 82)
UseB1 Offices and Workshop businesses
HeatingAir Conditioning

From the energy performance certificate lodged in November 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
Full Planning Permission Application
Postcode
W1U 3AT
Received
14 Jul 2025
Validated
14 Jul 2025
Ward
Marylebone
Case officer
Show
Target decision
22 Oct 2025
Decision
Application Permitted
Decision date
21 Oct 2025
Decision level
Delegated Decision
Applicant
Show
Agent
Montagu Evans

How this decision compares

Decided in 99 days from validation, 23 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.

17 neighbours consulted · Last counted 28 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference
PP-14152656
Planning Portal ref
PP-14152656
Comments by
20 Aug 2025
Site or press notice
30 Jul 2025
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
This Application seeks the Council confirmation that Prior Approval is not required in ex…
24/09027/P3JPA
Within ~100m

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2025 Refused
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2025
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2019 Approved
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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.