19 Ashbourne Grove, Chiswick, London,W4 2JH Data via plota.co.uk

P/2026/1408 - Householder Applications Refused
Extensions & alterations

Proposal

Erection of a rear roof and outrigger extension with three front roof windows to the house. Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
11 May 2026
✗
Refused
19 Jun 2026
Appeal
Not lodged

Refused on 19 Jun 2026 · Last checked 19 Sept 2026

Documents 7

Decision & officer reports 2

PDF DECTP3 P-Decision Notice · 19 Jun 2026 View ↗ PDF Delegated Report P-Delegated Report · 18 Jun 2026 View ↗

Statements & assessments 1

PDF PATEL (L) - Flood Risk Assessment.pdf P-Flood Risk Assessment · 11 May 2026 View ↗

Plans & drawings 2

PDF Existing and proposed floor and elevation plans P-All in one Plans Proposed · 11 May 2026 View ↗ PDF Location and section plans P-Location Plan · 11 May 2026 View ↗

Application forms 1

PDF Application Redacted P-Planning Application Form · 11 May 2026 View ↗

Other documents 1

PDF PATEL (L) - Fire Safety Strategy.pdf P-Published Fire Safety · 11 May 2026 View ↗

All documents on the council site ↗

Site constraints 7

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 Named permitted development rights are withdrawn here.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.
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 ↗
National infrastructure project 147 m away: Thames Tideway Tunnel
The site is 147 m from 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 ↗
Also on the record
Local nature reserve 468 m away: Chiswick Eyot; Inside the Hounslow built-up area; Public transport access: PTAL 3 (moderate), TfL 2023, for the 100 m square.
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.

Building

Floor area113 m² (1,216 sq ft)
Energy ratingD (64 out of 100), could reach B
PropertyMid-terrace house, 6 habitable rooms
Built1900 to 1929
HeatingBoiler and radiators, mains gas
WallsSolid brick, as built, no insulation (assumed)

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

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14 Aug 2026Pending

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Important details

Council
Hounslow
Application type
Householder Applications
Postcode
W4 2JH
Received
11 May 2026
Validated
11 May 2026
Ward
Chiswick Homefields
Case officer
Show
Decision
Refused
Decision date
19 Jun 2026
Applicant
Show

How this decision compares

Decided in 39 days from validation, 15 days faster than Hounslow's median of 54 for extensions. Refused, as 19% of extensions here are.

78%decided within 8 weeks
81%approved
920decided in the last year

Plota live figures for extensions 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
14 May 2026
Comments by
4 Jun 2026
Statutory expiry
6 Jul 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
34 Wilton Avenue, Chiswick, London, W4 2HY
Erection of a single storey wrap extension to the house
P/2025/2335
2025 Approved
First Floor Flat, 25 Cornwall Grove, Chiswick, London, W4 2LB
Erection of a rear roof extension with two front roof windows to the flat
P/2025/1833
2025 Approved
12 Wilton Avenue, Chiswick, London, W4 2HY
Erection of rear roof and outrigger extension with two front roof windows to the house.
P/2025/0950
2025 Approved
30 Wilton Avenue, Chiswick, London, W4 2HY
Erection of ground floor rear and infill extension to the house.
P/2025/0189
2024 Approved
40 BALFERN GROVE, CHISWICK, W4 2JX
Erection of proposed single storey rear infill extension to the house.
P/2024/1379
2024 Approved
21A ASHBOURNE GROVE, CHISWICK, W4 2JH
Erection of a single storey outbuilding in the rear garden of the house
P/2024/1305
2024 Refused
1A CORNWALL GROVE, CHISWICK, W4 2LB
Side infill extension to the existing rear roof dormer extension and second floor rear ou…
P/2024/0899
2024 Approved
49 WILTON AVENUE, CHISWICK, W4 2HX
Removal of Condition 3 (External Materials) to change the external materials to the rear…
P/2024/0748
2023 Refused
1A CORNWALL GROVE, CHISWICK, W4 2LB
Erection of a rear roof dormer infill extension, second floor rear outrigger extension an…
P/2023/3223
2023 Approved
44 CHISWICK LANE, CHISWICK, W4 2JQ
Replacement of the existing side door and the creation of an external courtyard; new roof…
P/2023/3469
2023 Refused
44 CHISWICK LANE, CHISWICK, W4 2JQ
Part conversion of the existing ground floor shop, office and workshop (Use Class E) to a…
P/2023/2224
2023 Approved
23 CORNWALL GROVE, CHISWICK, LONDON, W4 2LB
Erection of a single storey rear infill and rear extension to the house.
P/2023/1713
2023 Approved
11-13 CORNWALL GROVE, CHISWICK, LONDON, W4 2LB
Erection of a single storey rear and infill extension to both properties
P/2023/1397
2023 Approved
31 WILTON AVENUE, CHISWICK, W4 2HX
Erection of a garden shed in the style of a thai temple
P/2023/0686
2023 Approved
25 BALFERN GROVE, CHISWICK, W4 2JX
Ground floor rear extension 5.6 metres deep, maximum height of 3.05 metres, 3.00 metres h…
PA/2023/1063
2022 Withdrawn
13 WILTON AVENUE, CHISWICK, W4 2HX
Installation of an external unit to a heat pump to the side of the house
P/2022/2678
2022 Approved
49 WILTON AVENUE, CHISWICK, W4 2HX
Conversion of two flats into one two storey house incorporating the erection of a single…
P/2022/2222
2022 Approved
12 WILTON AVENUE, CHISWICK, W4 2HY
Erection of rear roof and outrigger extension with two front roof windows to the house.
P/2022/0683
2022 Approved
17 BALFERN GROVE, CHISWICK, LONDON, W4 2JX
Erection of a single storey rear Infill extension with three roof windows
P/2022/0850
2021 Approved
13 WILTON AVENUE, CHISWICK, W4 2HX
Erection of a rear roof dormer extension with juliet balcony and a second storey roof ext…
P/2021/4737
2016 Approved
FLAT FIRST FLOOR 53 WILTON AVENUE CHISWICK LONDON W4 2HX
Erection of a rear roof extension with an outrigger incorporating a juliet balcony and 2…
P/2016/1863
2016 Refused
8 BALFERN GROVE CHISWICK LONDON W4 2JX
Erection of a rear roof extension with an outrigger incorporating 3 front roof windows to…
P/2016/1727
2016 Approved
2 WILTON AVENUE CHISWICK LONDON W4 2HY
Proposed extension to existing cellar to create a basement with front and rear lightwells
P/2016/1125
2016 Approved
15 CORNWALL GROVE CHISWICK LONDON W4 2LB
Replacement of roof to existing side extension with glass roof and formation of new parap…
P/2016/0306
2016 Approved
21 CORNWALL GROVE CHISWICK LONDON W4 2LB
Ground floor rear extension 4.91 metres deep, maximum height of 3 metres, 2.4 metres high…
PA/2016/0100
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

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.