54 St Marys Crescent, Isleworth, TW7 4NA Data via plota.co.uk

P/2026/2372 - Householder Applications REGISTERED: Under Assessment
Extensions & alterations

Proposal

Erection of a single storey rear infill extension, conversion of garage into a habitable room, increase in roof height to allow creation of additional bedrooms, front porch extension and repositioning of the existing bay window to the house Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
17 Aug 2026
Decision
Expected by 12 Oct 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 10 Oct 2026, from Hounslow's recent extensions.

The consultation period closed on 18 Sept 2026.

Documents 8

Statements & assessments 1

PDF 54sma_das .pdf P-Design and Access Statement · 17 Aug 2026 View ↗

Plans & drawings 5

PDF s01.pdf P-Location Plan · 17 Aug 2026 View ↗ PDF s03.pdf P-Existing Plans · 17 Aug 2026 View ↗ PDF s04.pdf P-Existing Elevation · 17 Aug 2026 View ↗ PDF 03.01.pdf P-Proposed Plans · 17 Aug 2026 View ↗ PDF 03.02.pdf P-Proposed Elevation · 17 Aug 2026 View ↗

Application forms 1

PDF ApplicationFormRedacted.pdf P-Planning Application Form · 17 Aug 2026 View ↗

Other documents 1

PDF 54smc_fire safety.pdf P-Published Fire Safety · 17 Aug 2026 View ↗

All documents on the council site ↗

Site constraints 10

Osterley Park conservation area
Also Osterley Park. 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 Named permitted development rights are withdrawn here.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.
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
Registered park or garden 150 m away: Osterley Park; Inside the Hounslow built-up area; Public transport access: PTAL 2 (poor), TfL 2023, for the 100 m square; Priority habitat 25 m away: Deciduous woodland; Designated open space 24 m away; National infrastructure project 1920 m away: Teddington Direct River Abstraction (TDRA), at pre-application.
Not affected
Outside flood zones 2 and 3 · Not green belt · No listed building 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 £610,000 in October 2019. Detached house, freehold.

14 October 2019£610,000

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

Building

Floor area88 m² (947 sq ft)
Energy ratingE (51 out of 100), could reach B
PropertyDetached bungalow, 4 habitable rooms
Built1983 to 1990
HeatingBoiler and radiators, mains gas
WallsCavity wall, as built, insulated (assumed)

From the energy performance certificate lodged in April 2019, 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
Householder Applications
Postcode
TW7 4NA
Received
17 Aug 2026
Validated
17 Aug 2026
Ward
Osterley & Spring Grove
Case officer
Show
Applicant
Show

Decision outlook

Day 53 of the 56-day target. Hounslow usually decides extensions by day 54.

Day 533 days to the 56-day target
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 →

Consultation & key dates

Consultation
21 Aug 2026
Comments by
18 Sept 2026
Site or press notice
28 Aug 2026
Statutory expiry
12 Oct 2026

Historical activity at this location

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

This property

Previous applications at this address

2020 Approved
Fell Cypress tree (T1) to ground level in rear garden in conservation area.
P/2020/2003
Within ~100m

Nearby activity

2025 Approved
32 St Marys Crescent, Isleworth, TW7 4NA
Erection of an outbuilding in the rear garden.
P/2025/0870
2025 Approved
32 St Marys Crescent, Isleworth, TW7 4NA
Certificate of lawfulness for the proposed erection of a rear roof extension with front r…
P/2025/0673
2025 Withdrawn
48 St Marys Crescent, Isleworth, TW7 4NA
Certificate of lawfulness proposed for the installation of solar panels to the front and…
P/2025/0719
2024 Approved
20 St Marys Crescent, Isleworth, TW7 4NA
Works to tree within conservation area. T1 – Sycamore, rear garden, re-pollard to old pol…
P/2024/2981
2023 Approved
48 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Works to four trees within a conservation area; Reduction of Oak (T1) by 15% in total hei…
P/2023/0334
2022 Approved
48 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Five day notification to works to tree within a conservation area: T1 (Thuja Occidentalis…
P/2022/3028
2021 Withdrawn
40 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Fell three pine trees in rear garden (1,4 and 5 on map).
P/2021/1508
2021 Approved
40 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Fell three Pine trees in rear garden (1,4 and 5 on map).
P/2021/1612
2020 Approved
38 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Felling of tree in Osterley Park Conservation Area
P/2020/1365
2020 Approved
50 ST MARYS CRESCENT, ISLEWORTH, TW7 4NA
Erection of a first floor side extension and rear roof extensions with a front roof windo…
P/2020/0617
2018 Approved
46 ST MARYS CRESCENT ISLEWORTH TW7 4NA
Erection of a single storey outbuilding in the rear garden of the house
P/2018/1486
2018 Approved
44 ST MARYS CRESCENT ISLEWORTH TW7 4NA
Erection of a part single storey rear extension to the house
P/2018/1676
2018 Refused
44 ST MARYS CRESCENT ISLEWORTH LONDON TW7 4NA
Certificate of Lawfulness for the erection of a single storey rear extension to the house
P/2018/1357
2017 Approved
46 ST MARYS CRESCENT ISLEWORTH LONDON TW7 4NA
Erection of a part single storey, part two storey rear extension with roof terrace. A rea…
P/2017/0360
2017 Approved
46 ST MARYS CRESCENT ISLEWORTH TW7 4NA
Rebuilding of a front boundary wall.
P/2017/0549
2016 Refused
Adjacent to 4 ST MARYS CRESCENT ISLEWORTH TW7 4QG
Demolition of derelict lock-up garage and construction of a one-bedroom house.
P/2016/4872
2016 Approved
24 ST MARY'S CRESCENT ISLEWORTH LONDON TW7 4NA
Certificate of lawfulness for erection of a single storey side extension to the house
P/2016/1004
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.