26 Thornton Avenue, Chiswick, London, W4 1QG Data via plota.co.uk

P/2026/0194 - PF-Full Applications Approved
Change of useDemolitionExtensions & alterationsNew homesSolar & renewables

Proposal

Erection of single storey side extension and rear extension. Enlargement of the existing basement. Replacing existing windows. Installation of air source heat pump in rear garden. Installation of new fencing on the front boundary. Conversion of the existing two self contained flats to a single family house. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
21 Jan 2026
✓
Validated
28 Jan 2026
✓
Approved
9 Apr 2026

Approved on 9 Apr 2026 · Last checked 19 Sept 2026

Documents 15

Decision & officer reports 2

PDF DECTP2 P-Decision Notice · 9 Apr 2026 View ↗ PDF P-Delegated Report P-Delegated Report · 7 Apr 2026 View ↗

Statements & assessments 6

PDF P-Flood Risk Assessment P-Flood Risk Assessment · 9 Apr 2026 View ↗ PDF P-Design and Access Statement P-Design and Access Statement · 9 Apr 2026 View ↗ PDF P-Statement Other P-Statement Other · 9 Apr 2026 View ↗ PDF P-Published Noise Assessment P-Published Noise Assessment · 7 Apr 2026 View ↗ PDF P-Statement Other P-Statement Other · 27 Mar 2026 View ↗ PDF 26 Thornton Avenue - Fire Safety Statement.pdf P-Published Fire Safety · 21 Jan 2026 View ↗

Plans & drawings 6

PDF Updated P-Proposed Plans · 24 Mar 2026 View ↗ PDF P-Rejected Plans P-Rejected Plans · 4 Feb 2026 View ↗ PDF 26 Thornton Avenue - S001 Existing Location Plan.pdf P-Location Plan · 21 Jan 2026 View ↗ PDF P-Rejected Plans P-Rejected Plans · 21 Jan 2026 View ↗ PDF 26 Thornton Avenue - Existing Drawings.pdf P-All in one Plans Proposed · 21 Jan 2026 View ↗ PDF P-Rejected Plans P-Rejected Plans · 21 Jan 2026 View ↗

Application forms 1

PDF ApplicationFormRedacted.pdf P-Planning Application Form · 21 Jan 2026 View ↗

All documents on the council site ↗

Associated applications 2

Site constraints 9

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 ↗
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 ↗
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.
Also on the record
Conservation area 78 m away: Chiswick High Road; Inside the Hounslow built-up area; Public transport access: PTAL 4 (good), TfL 2023, for the 100 m square; Town centre 82 m away: Chiswick.
Not affected
Not green belt · No listed building at the site · 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 £1,710,000 in May 2024. Semi-detached house, freehold.

22 May 2024£1,710,000

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

Building

Floor area177 m² (1,905 sq ft)
Energy ratingE (47 out of 100), could reach B
PropertySemi-detached house, 7 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

From the energy performance certificate lodged in October 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

14 Aug 2026Pending

26 Thornton Avenue,Chiswick,W4 1QG

Details of Condition 5 (Construction Logistics Plan) submitted pursuant to permi...

P/2026/2358
3 Aug 2026Withdrawn

Salisbury Court,Thornton Avenue,Chiswick,W4 1QH

Works to trees in a conservation area ; G1 - Cotoneaster/ Lilac to reduce height...

P/2026/2253
16 Jun 2026Approved

Flat 2 and 3, 96 Thornton Avenue, Chiswick ,London, W4 1QQ

Retrospective conversion of first and second floor flats into one self-contained...

P/2026/1785

Nearby new applications

1 Oct 2026Pending

5 Dale Street,Chiswick,London,W4 2BJ

Erection of a rear roof extension and rear outrigger extension, together with th...

P/2026/2786
1 Oct 2026Pending

5 Dale Street,Chiswick,London,W4 2BJ

Erection of a single storey rear and side extension.

P/2026/2788
24 Sept 2026Pending

32 to 34 Chiswick High Road, Chiswick, London, W4 1TE

Installation of an externally illuminated fascia sign and one non illuminated pr...

P/2026/2701
24 Sept 2026Pending

32 to 34 Chiswick High Road, Chiswick, London, W4 1TE

Installation of replacement ground floor front fascia signs, a projecting sign a...

P/2026/2745
29 Sept 2026Pending

32-34, Devonshire Road, Chiswick, London, W4 2HD

Installation of a replacement ground floor glazed shopfront and associated re-re...

P/2026/2753
29 Sept 2026Pending

7 Netheravon Road,Chiswick,W4 2NA

Erection of a second floor rear extension with a mansard roof. Installation of n...

P/2026/2748

Important details

Council
Hounslow
Application type
PF-Full Applications
Postcode
W4 1QG
Received
21 Jan 2026
Validated
28 Jan 2026
Ward
Chiswick Homefields
Case officer
Show
Decision
Approved
Decision date
9 Apr 2026
Applicant
Show

How this decision compares

Decided in 71 days from validation, 15 days slower than Hounslow's median of 56 for changes of use. Approved, as 52% of changes of use here are.

62%decided within 8 weeks
52%approved
102decided in the last year

Plota live figures for changes of use 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
4 Feb 2026
Comments by
25 Feb 2026
Statutory expiry
25 Mar 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
7A, 7B & 7C Ennismore Avenue, Chiswick, London, W4 1SE
Installation of a matching replacement first floor front door (with fanlights), ground fl…
P/2025/2753
2025
Flat 1, 23 Ennismore Avenue, Chiswick, London, W4 1SE
Erection of a single storey rear extension with fully glazed projecting roof light follow…
P/2025/2803
2025 Refused
23 Ennismore Avenue, Chiswick, London, W4 1SE
Erection of ground floor rear extension, increase in height of existing garden facing par…
P/2025/1724
2024 Refused
16 Upham Park Road, Chiswick, London, W4 1PG
Installation of air source heat pump in the rear garden of the house.
P/2024/2062
2024 Approved
25 ENNISMORE AVENUE, CHISWICK, W4 1SE
Retrospective application for the erection of a single storey rear extension and associat…
P/2024/0693
2024 Approved
38 UPHAM PARK ROAD, CHISWICK, W4 1PG
Erection of a single front roof extension replacing existing front dormers, erection of a…
P/2024/0724
2024 Approved
112A CHISWICK HIGH ROAD, CHISWICK, W4 1PU
Replacement of existing timber single glazed windows with double glazed UPVC sash windows
P/2024/0442
2023 Approved
27 THORNTON AVENUE, CHISWICK, W4 1QE
Replacement of the house's existing front and rear windows and front roof light, two stor…
P/2023/3042
2023 Withdrawn
25 ENNISMORE AVENUE, CHISWICK, W4 1SE
Demolition of rear extension and construction of rear extension at Ground floor level and…
P/2023/3190
2023 Refused
FLAT FIRST AND SECOND FLOORS 1 UPHAM PARK ROAD, CHISWICK, LONDON, W4 1PQ
Installation of rear sliding doors to the first floor flat
P/2023/1926
2023 Approved
GROUND FLOOR FLAT 13 THORNTON AVENUE, CHISWICK, W4 1QE
Erection of a single storey side and rear extension following the conversion from two fla…
P/2023/0693
2022 Approved
28 THORNTON AVENUE, CHISWICK, W4 1QG
Erection of a single storey rear and rear infill extension to the house.
P/2022/4025
2022 Approved
112 CHISWICK HIGH ROAD, CHISWICK, W4 1PU
Installation of a new shopfront
P/2022/3281
2022 Approved
19 THORNTON AVENUE, CHISWICK, W4 1QE
Erection of single storey side, rear infill and rear extension to the house.
P/2022/2432
2022 Approved
20 UPHAM PARK ROAD, CHISWICK, W4 1PG
Erection of a single storey rear extension and a front below ground extension with bin st…
P/2022/2000
2022 Approved
35 UPHAM PARK ROAD, CHISWICK, W4 1PQ
Erection of a rear roof extension incorporating a Juliet balcony and the installation of…
P/2022/0101
2021 Approved
20 MAYFIELD AVENUE, CHISWICK, LONDON, W4 1PW
Erection of single storey side and rear ground floor extension to the house
P/2021/4587
2021 Approved
4-6 THORNTON AVENUE, CHISWICK, LONDON, W4 1QG
Variation of condition 1 (Approved Plans) to propose a storage space beneath the front ga…
P/2021/3442
2021 Refused
25A UPHAM PARK ROAD, CHISWICK, LONDON, W4 1PQ
Erection of a single storey rear infill extension to the ground floor flat
P/2021/2246
2021 Approved
FLAT 2 15 ENNISMORE AVENUE, CHISWICK, W4 1SE
Replacement of existing door and sidelight with a white UPVC door and sidelight on first…
P/2021/2205
2016 Approved
24 THORNTON AVENUE CHISWICK LONDON W4 1QG
Refurbishemnt of existing side return with new glazed roof, new patio doors and brickwork…
P/2016/2763
2016 Approved
23 THORNTON AVENUE CHISWICK LONDON W4 1QE
Details of construction method statement submitted pursuant to condition 4 of planning pe…
P/2016/2633
2016 Approved
FLAT 3 15 ENNISMORE AVENUE CHISWICK LONDON W4 1SE
Erection of a rear roof extension to flat 3 with 2 roof windows to front elevation
P/2016/2478
2016 Approved
34 MAYFIELD AVENUE CHISWICK LONDON W4 1PW
Details of construction method statement submitted pursuant to condition 7 of planning pe…
P/2016/1393
2016 Withdrawn
116 CHISWICK HIGH ROAD CHISWICK LONDON W4 1PU
Change of use of the Basement from mini cab office to A3 and A5 for hot food cooking and…
P/2016/1237
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
Source: MHCLG planning statistics · See full council rankings

Sale prices: Contains HM Land Registry data © Crown copyright and database right 2026. This data is licensed under the Open Government Licence v3.0.

Freehold boundary: © Crown copyright and database rights 2026, HM Land Registry. Polygons © Crown copyright and database rights 2026 Ordnance Survey 100026316. Conditions of use

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.