Mulliner House, Flanders Road, Chiswick, London, W4 1NN Data via plota.co.uk

P/2025/3644 - PF-Full Applications Approved

Proposal

Erection of a single storey side extension and an additional floor at roof level with a roof terrace, relocation of the entrance and alterations to the façade, enclosure of the basement car park to create swimming pools with landscaping, plants and associated works Data via plota.co.uk

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View original council record ↗Last checked 11 Oct 2026, 06:47

Street View

Application progress

✓

Received

8 Dec 2025

✓

Validated

18 Dec 2025

✓

Approved

24 Jul 2026

Approved on 24 Jul 2026 · Last checked 4 Oct 2026

Documents 106

Decision & officer reports 2

PDF P-Delegated Report P-Delegated Report · 24 Jul 2026 View ↗ PDF DECTP2 P-Decision Notice · 24 Jul 2026 View ↗

Statements & assessments 38

Plans & drawings 54

Application forms 1

PDF ApplicationFormRedacted.pdf P-Planning Application Form · 8 Dec 2025 View ↗

Consultation & comments 2

PDF TfL Letter of No Objection_redacted P-Supporting Information · 5 Jun 2026 View ↗ PDF Mulliner House DSO Response - Feb 26_redacted P-Supporting Information · 26 Feb 2026 View ↗

Site constraints 11

Flood zone 3, rivers and sea

High chance: a 1 in 100 or greater annual chance from rivers, or 1 in 200 from the sea. Any development here needs a flood risk assessment. Defences are not counted.

The Environment Agency flood map for planning. Homes in zone 3 must also pass the sequential test. Surface water flooding is a separate map.

Flood map ↗

Bedford Park conservation area

Also Bedford Park (article 4). 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.

Article 4 direction

Dwellinghouses (C3) to small HMOs (C4) - borough-wide Article 4 Direction. Named permitted development rights are withdrawn here.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.

National infrastructure project: Thames Tideway Tunnel

The site is inside the project boundary. Waste water treatment, decided. The project page says whether consent was granted.

Nationally significant infrastructure projects (power stations, electricity lines, pipelines, major roads and railways, harbours, airports and reservoirs) are consented by a Secretary of State under the Planning Act 2008, after an examination by the Planning Inspectorate, rather than by the council. The boundary is the one the Inspectorate consults on and can change as the scheme does. Projects are shown within 2 km of the site.

Planning Inspectorate project page ↗

Archaeological priority area

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: Hounslow 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 ↗

Habitat network: Network Enhancement Zone 2

Where habitat is joined up enough to work as a network. Context, not a constraint on its own.

21 listed buildings within 150 m

Nearest: Bedford Park Works (Hj Mulliner), Grade II, 42 m away · 2 Grade II*, 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 21 with distances

42 mBedford Park Works (Hj Mulliner)Grade II
42 m4, Bath Road W4Grade II
49 m6 and 8, Bath Road W4Grade II
52 mThe TabardGrade II*
67 m10, Bath Road W4Grade II
78 mThe VicarageGrade II
79 m1, Priory Gardens W4Grade II
94 mChurch of St Michael and All AngelsGrade II*
103 m1 and 3, Bath Road W4Grade II
104 m2-5, Priory Gardens W4Grade II
115 mUnnamed
115 mK6 Telephone Kiosk Outside St Michael and All Angels ChurchGrade II
117 mBedford Park War MemorialGrade II
118 m6, Priory Gardens W4Grade II
122 m5-7, Bath Road W4Grade II
131 m2, Woodstock Road W4Grade II
131 mPriory HouseGrade II
137 m2-12, Priory Avenue W4Grade II
139 m1, Rupert Road W4Grade II
146 m1 and 3, Priory Avenue W4Grade II
148 m4 and 6, Woodstock Road W4Grade II

Historic England ↗

Also on the record

Inside the Hounslow built-up area; Public transport access: PTAL 4 (good), TfL 2023, for the 100 m square; Town centre 64 m away: Chiswick.

Not affected

Not green belt · No scheduled monument at the site

Checked on 6 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.

Sales history 1

Last sold for £15,500,000 in July 2025. Other property, freehold.

3 July 2025£15,500,000Recorded as a transfer outside a standard sale

Sale prices from HM Land Registry's price paid record, matched to this application by its address.

Building

Floor area3,592 m² (38,664 sq ft)

Energy ratingD (asset rating 92)

UseB1 Offices and Workshop businesses

HeatingAir Conditioning

From the energy performance certificate lodged in February 2020, the latest held for this property. The building may have changed since. View the certificate

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Important details

Council: Hounslow
Application type: PF-Full Applications
Postcode: W4 1NN
Received: 8 Dec 2025
Validated: 18 Dec 2025
Ward: Chiswick Homefields
Case officer: Show
Decision: Approved
Decision date: 24 Jul 2026

How this decision compares

Decided in 218 days from validation, 162 days slower than Hounslow's median of 56 for full applications. Approved, as 69% of full applications here are.

This one218d

Council56d

UK56d

55%decided within 8 weeks

69%approved

398decided in the last year

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

Public comments

No public comments yet.

Read the comments on the council site ↗

Consultation & key dates

Consultation: 24 Dec 2025
Comments by: 10 Feb 2026
Site or press notice: 9 Jan 2026
Statutory expiry: 12 Feb 2026

Historical activity at this location

25 nearby applications on record - archival context, not part of the live application.

Within ~100m

Nearby activity

2025 Approved

St Michaels Vicarage Priory Gardens, Chiswick, London, W4 1TT

Works to tree within TPO 53: Oak (Quercus robur) - Removal of major deadwood and a crown…

P/2025/3161 1 Dec 2025

2025 Approved

6A Bath Road, Chiswick, London, W4 1LW

Works to tree in a Conservation Area - Removal of 1 X Ash tree

P/2025/2677 1 Oct 2025

2025 Approved

St Michaels Vicarage, Priory Gardens,Chiswick,W4 1TT

Works to a tree within Tree Preservation Order No. 53: Tree of Heaven (T1) - Reduce crown…

P/2025/2230 22 Aug 2025

2025 Approved

St Michaels Vicarage, Priory Gardens,Chiswick,W4 1TT

Works to trees in a Conservation Area: Tree of Heaven - Reduce crown to previous pruning…

P/2025/2191 22 Aug 2025

2025 Approved

1A Flanders Road, Chiswick, London, W4 1NQ

Works to trees within a conservation area: G1 Lime x 4 (Tilia spp) - Reduce all round to…

P/2025/0634 3 Apr 2025

2025 Approved

1A Flanders Road, Chiswick, London, W4 1NQ

Works to tree within a conservation area: Car park area T2 Himalayan Birch x 1 (Betula ut…

P/2025/0640 3 Apr 2025

2024 Approved

The Tabard, 2 Bath Road,Chiswick,W4 1LW

Works to tree in a Conservation Area - 1 x Lime to pollard back to previous pruning point…

P/2024/4364 3 Feb 2025

2024 Approved

8 Flanders Road, Chiswick, London, W4 1NG

Replacement of the front door set, front wall, gate and tiles along the path to the front…

P/2024/3575 16 Dec 2024

2024 Approved

Mulliner House,Flanders Road,Chiswick,W4 1NN

Works to trees in a Conservation Area - G1- 3 X Maple prune clear of building to allow 1…

P/2024/3506 2 Dec 2024

2024 Refused

1 First Floor Left, Priory Gardens,Chiswick,London,Hounslow,W4 1TT

Works to tree within a conservation area: T1: Twin-stemmed Gleditsia - fell in sections t…

P/2024/3176 4 Nov 2024

2024 Approved

1A Flanders Road, Chiswick, London, W4 1NQ

Works to a tree in a Conservation Area: Fig (T1) (x1) - Fell to ground level.

P/2024/2786 17 Sep 2024

2024 Approved

ST MICHAELS VICARAGE PRIORY GARDENS, CHISWICK, W4 1TT

Works to a Yew tree T1 at front of site within Tree Preservation Order 40. Reduce the cro…

P/2024/1032 14 Jun 2024

2024 Approved

8 FLANDERS ROAD, CHISWICK, W4 1NG

Erection of a rear roof extension with one rear roof window and one front roof window, de…

P/2024/0859 16 May 2024

2023 Refused

8-10 BATH ROAD, CHISWICK, W4 1LW

Listed Building Consent for replacement of all existing timber framed single glazed front…

P/2023/3356 14 Dec 2023

2023 Refused

8-10 BATH ROAD, CHISWICK, W4 1LW

Replacement of all existing timber framed single glazed front windows with new timber fra…

P/2023/3353 14 Dec 2023

2023 Approved

ST MICHAELS VICARAGE PRIORY GARDENS, CHISWICK, LONDON, W4 1TT

Felling of a Acacia tree at front of site within TPO No 40

P/2023/0580 11 Apr 2023

2022 Approved

4 FLANDERS ROAD, CHISWICK, W4 1NG

Works to four trees in rear garden within a conservation area. Apple (T1) crown reduce he…

P/2022/3561 23 Nov 2022

2022 Refused

ST MICHAELS VICARAGE PRIORY GARDENS, CHISWICK, LONDON, W4 1TT

Fell Robinia (T1) and treat stump with herbicide to prevent regrowth at front of site wit…

P/2022/3164 16 Nov 2022

2022 Approved

10B BATH ROAD, CHISWICK, LONDON, W4 1LW

Works to Purple Leaf Plum tree (T1) in rear garden in conservation area. Reduce back to p…

P/2022/2684 23 Sep 2022

2022 Approved

1A FLANDERS ROAD, CHISWICK, W4 1NQ

Front Garden T1 Lime x 4 (Tilia spp): Reduce all around to previous pollard points by app…

P/2022/2526 7 Sep 2022

2016 Approved

THE TABARD 2 BATH ROAD CHISWICK LONDON W4 1LW

Listed building application for internal alterations and external re-decorations.

P/2016/2641 16 Sep 2016

2016 Refused

86 THORNTON AVENUE CHISWICK LONDON W4 1QQ

Erection of rear extension at first and second floors

P/2016/2811 9 Aug 2016

2016 Withdrawn

86A THORNTON AVENUE CHISWICK LONDON W4 1QQ

Erection of a first and second floor rear extension with enlargement of external stairwel…

P/2016/0750 6 Apr 2016

2016 Approved

804-834 BATH ROAD CHISWICK LONDON

Details of contiminated land pursuant to condition 18a and 18b of planning permission 000…

P/2016/0488 22 Mar 2016

2016 Approved

2 PRIORY GARDENS CHISWICK LONDON W4 1TT

Works to trees within a conservation area - Ash (T1) - crown reduce by 15-20% approx 2m f…

P/2016/0276 15 Feb 2016

Hounslow

Planning Authority Score

2.1/10

Poor

#268 of 296 councils

Relevant to this application:

Householder decisions

Hounslow is slower than most councils at deciding householder applications, ranking #203 out of 296. 47% of applications have the time limit extended, above the 41% national average. Hounslow is also one of the strictest councils - it refuses more householder applications than almost any other, with only 75% approved vs 90% nationally.

One of the strictest councils

only 75% approved vs 90% nationally

These figures are council-wide context, not a prediction for this application. View full council performance

Hounslow decision statistics

Based on MHCLG data, the year to March 2026

71%

Overall approval rate

Below avg (87%) #294 of 296

75%

Householder approved

Below avg (90%) #293 of 296

56%

Decided in 8 weeks

Below avg (63%) #203 of 296

47%

Extended time limit

Above avg (41%) #208 of 296

38%

Minor dwellings approved

82 decided (1-9 homes)

93%

Major dwellings approved

14 decided (10+ homes)

29%

Change of use approved

72 decided

1,191

Total decisions

340 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.

Mulliner House, Flanders Road, Chiswick, London, W4 1NN Data via plota.co.uk

Proposal

Application progress

Documents 106

Decision & officer reports 2

Statements & assessments 38

Plans & drawings 54

Application forms 1

Consultation & comments 2

Other documents 9

Site constraints 11

Sales history 1

Building

Other new applications on this street

Nearby new applications

Important details

How this decision compares

Public comments

Consultation & key dates

Nearby activity