9 Mansfield Street London W1G 9NZ Data via plota.co.uk

25/06412/FULL - Full Planning Permission Application Pending

Proposal

Use as building as a single family dwellinghouse (Class C3). External alterations including the installation of replacement windows and doors. Installation of garage doors in place of to two windows on the Mansfield Mews frontage, installation of replacement roof lights, removal of roof lights at main roof level, removal of cantilevered outrigger WC at rear first floor level, alterations to fenestration of the mews portion of the building facing the internal courtyard to mews portion of building. Reconstruct part of brick parapet, installation of plant at main roof level . [SITE INCLUDES 6 MANSFIELD MEWS] Data via plota.co.uk

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View original council record ↗Last checked 31 Oct 2026, 16:26

Street View

Application progress

✓

Received

8 Sept 2025

✓

Validated

25 Sept 2025

✓

Consultation

30 Sept 2025

Decision

Target date was 20 Nov 2025

Under consideration

No decision has been issued yet. Plota predicted a decision around 6 Nov 2026; it is now day 407.

The consultation period closed on 29 Oct 2025.

Documents 156

Statements & assessments 12

Plans & drawings 115

Application forms 1

PDF APPLICATION FORM REDACTED Application Form · 8 Sept 2025 View ↗

Consultation & comments 3

PDF CNSLT-CONSULTEE CLOUD STD Background Papers · 30 Sept 2025 View ↗ PDF CNSLT-CONSULTEE CLOUD STD Background Papers · 30 Sept 2025 View ↗ PDF NEIGHBOUR NOTIFICATION LETTER (21D) Background Papers · 30 Sept 2025 View ↗

Site constraints 9

Grade II* listed: 5-13, Mansfield Street W1

List entry 1273679 · The pin is inside its outline · 61 more listed buildings within 150 m (1 Grade I, 14 Grade II*, 45 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 61 with distances

15 m5 and 6, Mansfield Mews W1Grade II
16 m7 and 9, Mansfield Mews W1Grade II
25 m15, Mansfield Street W1Grade II
25 m82, NEW CAVENDISH STREET W1 (See details for further address information)Grade II*
31 mNumber 3 and Garden Screen ColonnadeGrade II
32 m54, Harley Street W1Grade II
32 m50, Harley Street W1Grade II
32 m48, Harley Street W1Grade II
34 m46, Harley Street W1Grade II
37 m44, Harley Street W1Grade II
38 m76A, NEW CAVENDISH STREET (See details for further address information)Grade II
40 mNo 2 and Attached Railings No 4 and Attached RailingsGrade II
54 m61 and 63, New Cavendish Street W1Grade II*
55 m62, Harley Street W1Grade II
60 m59, Harley Street W1Grade II
60 m10, Duchess Street W1Grade II
61 m51, Harley Street W1Grade II
61 m8, Queen Anne Street W1Grade II
63 m63, Harley StreetGrade II
65 m64 and 66, Harley Street W1Grade II
66 m65, Harley Street W1Grade II
66 m21, Duchess Mews W1Grade II
66 m19, Duchess Mews W1Grade II
66 m17, Duchess Mews W1Grade II
67 m49, Harley Street W1Grade II
70 mQueen's CollegeGrade II
73 m17-21, Portland Place W1Grade II*
75 mChandos HouseGrade I
78 m27-35 Portland PlaceGrade II*
81 m67, Harley Street W1Grade II
87 m69 and 71, Harley Street W1Grade II*
90 mThird Floor And Fourth Floor Flat 82 Harley Street London W1G 7HB
95 m39, Harley Street W1Grade II
100 m37, Harley Street W1Grade II*
101 m73 Harley StreetGrade II
102 mThe JackalopeGrade II
105 m9-13, Queen Anne Street W1Grade II
108 m75, Harley Street W1Grade II*
114 m2-6, Chandos Street W1Grade II
115 m77, Harley Street W1Grade II*
115 m24, Queen Anne Street W1Grade II
120 m78, Harley StreetGrade II*
121 m26, Queen Anne Street W1Grade II
122 m24, Wimpole Street W1Grade II
124 m79 and 81, Harley Street W1Grade II
124 m28, Queen Anne Street W1Grade II
125 m23, Wimpole Street W1Grade II
126 mStatue of Quintin Hogg (in Centre of Road Opposite North End of Broadcasting House)Grade II
127 m18-20, Wimpole Street W1Grade II
132 m26-30, Portland Place W1Grade II*
133 m28, 29 and 29a, Wimpole Street W1Grade II
137 m30, 30a, 30b and 31, Wimpole Street W1Grade II
137 mBroadcasting HouseGrade II*
138 m32, Portland Place W1Grade II
140 m29, Harley StreetGrade II
141 m34, Queen Anne Street W1Grade II
143 m83 and 85, Harley Street W1Grade II*
145 m34-52, Portland Place W1Grade II*
147 m33-36, Wimpole Street W1Grade II
148 m41-47, Portland Place W1Grade II*
148 m29, Queen Anne Street W1Grade II

Historic England ↗

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 ↗

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.

Archaeological priority area: City of Westminster APA 2.5

An assessment or field evaluation may be asked for before ground works.

The council or Historic England considers archaeology likely here. A desk-based assessment, and sometimes trial trenching, can be asked for with the application.

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

National infrastructure project 1811 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.

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 area1,015 m² (10,925 sq ft)

Energy ratingE (asset rating 102)

UseOffices and Workshop Businesses

HeatingHeating and Natural Ventilation

From the energy performance certificate lodged in January 2023, the latest held for this property. The building may have changed since. View the certificate

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Other new applications on this street

20 Aug 2026Pending

2 Mansfield Street London W1G 9NZ

Installation of full fibre cables on and through the building.

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27 Jul 2026Approved

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21 Jul 2026Approved

Orbis House 5 Mansfield Street London W1G 9NG

Amendments to planning permission dated 05 September 2024 (RN: 24/01895/FULL) fo...

26/04873/NMA

3 Jun 2026Approved

Flat 49 2 Mansfield Street London W1G 9NF

Replacement of seven windows.

26/01207/LBC

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Replacement of existing timber sash windows with slim double glazed timber sash ...

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Important details

Council: Westminster
Application type: Full Planning Permission Application
Postcode: W1G 9NZ
Received: 8 Sept 2025
Validated: 25 Sept 2025
Ward: Marylebone
Case officer: Show
Target decision: 20 Nov 2025
Agent: Newmark

Decision outlook

Day 407, past the statutory target. 58% of full applications in Westminster are decided within thirteen weeks; extensions of time are common, and the council need not decide on the day. Last seen undecided on 31 Oct 2026.

target

predicted

Day 407351 days past the 56-day target

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

1comment received

1 supporting

74 neighbours consulted · Last counted 31 Oct 2026

Read the comments on the council site ↗

Consultation & key dates

Alt. reference: PP-14264525
Planning Portal ref: PP-14264525
Comments by: 29 Oct 2025
Site or press notice: 30 Sept 2025
Env. assessment: No

Historical activity at this location

35 previous applications on record - archival context, not part of the live application.

This property

Previous applications at this address

2025

Change of Use from office (Class E) to residential (Use Class C3), refurbishment and reco…

25/06413/LBC 8 Sep 2025

2024

Limited demolition, strip out and investigative works to 9 Mansfield Street and 6 Mansfie…

24/09052/LBC 24 Dec 2024

2024 Approved

Removal of High Risk ACM's ( Asbestos Containing Materials ) that have been identified wi…

24/04574/LBC 3 Sep 2024

2022 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

22/07291/AD7 18 Nov 2022

2022 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

22/02751/AD7 17 May 2022

2021 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

21/07041/AD7 17 Nov 2021

2021 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

21/02799/AD7 12 May 2021

2020 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

20/06686/AD7 12 Nov 2020

2020 Approved

Display for a temporary period of six months of a non-illuminated estate agent board atta…

20/02566/AD7 11 May 2020

2020 Refused

Display for a temporary period of six months of a non-illuminated estate agent board atta…

20/00527/AD7 31 Jan 2020

Within ~100m

Nearby activity

2025

4 Queen Anne Street London W1G 9LQ

Repositioning of the plant units and new anti-vibration mounts. (Linked with 25/07282/FUL…

25/07252/LBC 7 Oct 2025

2025

4 Queen Anne Street London W1G 9LQ

Variation of condition 1 of planning permission dated 22nd November 2024 (RN: 24/05074/FU…

25/07255/FULL 7 Oct 2025

2025

4 Queen Anne Street London W1G 9LQ

Installation of additional anti-vibration mounts and reposition the currently approved pl…

25/07251/LBC 7 Oct 2025

2025 Withdrawn

4 Mansfield Mews London W1G 9NL

Partial removal of existing roof to create new roof terrace, accessible via a new stair w…

25/05099/FULL 1 Oct 2025

2025 Withdrawn

4 Mansfield Mews London W1G 9NL

Partial removal of existing roof to create new roof terrace, accessible via a new stair w…

25/05100/LBC 1 Oct 2025

2025

2 Mansfield Mews London W1G 9NL

Replacement of existing glass roof finish with a zinc covering.

25/06964/FULL 29 Sep 2025

2025 Approved

Flat 53 2 Mansfield Street London W1G 9NF

Alterations to the internal layout including the removal of partitions, construction of n…

25/04293/LBC 14 Aug 2025

2025

10 Duchess Street London W1G 9AB

Internal alterations (in connection with the change of use approved under 24/02735/FULL a…

25/03265/LBC 13 May 2025

2025

15 Mansfield Street London W1G 9NH

Installation of a dumbwaiter from basement to first-floor level.

25/02948/LBC 29 Apr 2025

2025

57 Harley Street London W1G 8QS

Relocation of the residential (Class C3) space from the part ground and basement floors t…

25/02646/FULL 16 Apr 2025

2025

15 Mansfield Street London W1G 9NH

Internal fit-out works.

25/00664/LBC 31 Jan 2025

2025

17 Duchess Mews London W1G 9DU

Installation of ten PV panels and replacement of air conditioning unit with air source he…

25/00325/LBC 20 Jan 2025

2024

17 Duchess Mews London W1G 9DU

Variation of conditions 1,4, 5 of planning permission dated 6th August 2024 (RN 24/00210/…

24/08568/FULL 9 Dec 2024

2024

17 Duchess Mews London W1G 9DU

Variation of conditions 1,4, 5 of listed building consent dated 6th August 2024 (RN 24/00…

24/08732/LBC 9 Dec 2024

2024

Flat 34 2 Mansfield Street London W1G 9NF

Mounting of air source heat pump at roof level and associated cabling and connection via…

24/07905/LBC 12 Nov 2024

2024

Flat 40 2 Mansfield Street London W1G 9NF

Relocation of existing air source heat pump set back an additional 2m from the roof's edg…

24/07735/FULL 6 Nov 2024

2024

Flat 40 2 Mansfield Street London W1G 9NF

Relocation of existing air source heat pump set back an additional 2m from the roof's edg…

24/07736/LBC 6 Nov 2024

2024

Flat 15 2 Mansfield Street London W1G 9NF

Relocation of Air Source Heat Pump to a different part of the building roof.

24/07625/LBC 1 Nov 2024

2024

40 Harley Street London W1G 9PP

Installation of plant to roof within two acoustic enclosures, with associated pipework to…

24/07276/FULL 18 Oct 2024

2024

Flat 15 2 Mansfield Street London W1G 9NF

Replacement windows and doors. (Linked to 24/05895/FULL)

24/05896/LBC 23 Aug 2024

2020 Approved

Flat 15 2 Mansfield Street London W1G 9NF

Variation of condition 1 of listed building consent dated 17 March 2020 (RN 19/08962/LBC)…

20/05880/LBC 25 Nov 2020

2020 Approved

Flat 35 2 Mansfield Street London W1G 9NF

Internal alterations including new kitchen and bathrooms, alterations to drainage, new el…

20/05626/LBC 20 Nov 2020

2020 Approved

15 Mansfield Street London W1G 9NH

Removal of existing roof top plant rooms. Erection of single storey pitched roof extensio…

20/05446/FULL 3 Nov 2020

2020 Approved

15 Mansfield Street London W1G 9NH

Removal of existing roof top plant rooms. Erection of single storey pitched roof extensio…

20/05447/LBC 3 Nov 2020

2020 Approved

30 Weymouth Mews London W1G 7EB

Alterations to external elevations including new window within coach door opening and rec…

20/04320/FULL 23 Oct 2020

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

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.

9 Mansfield Street London W1G 9NZ Data via plota.co.uk

Proposal

Application progress

Documents 156

Statements & assessments 12

Plans & drawings 115

Application forms 1

Consultation & comments 3

Other documents 25

Site constraints 9

Building

Other new applications on this street

Nearby new applications

Important details

Decision outlook

Public comments

Consultation & key dates

Previous applications at this address

Nearby activity