165 Cowley Road Uxbridge Data via plota.co.uk

45080/APP/2026/2372 Undecided

Proposal

Conversion of roof space to habitable use to include a rear dormer with Juliette balcony and Hip to Gable roof extension with 2 front roof lights following the removal of 1 chimney stack and the erection of an outbuilding at the rear garden for use as a home office (Application for a Certificate of Lawful Development for a Proposed Development). Data via plota.co.uk

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View original council record ↗Last checked 27 Oct 2026, 09:44

Application progress

✓

Received

9 Oct 2026

✓

Validated

21 Oct 2026

Decision

Expected by 16 Dec 2026

Under consideration

No decision has been issued yet. Plota predicts a decision around 14 Dec 2026, from Hillingdon's recent extensions.

Documents

View the documents on the council's website ↗

Site constraints 9

2 Article 4 directions

Residential extensions · Houses of Multiple Occupation (HMOs). Named permitted development rights are withdrawn here.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: Hillingdon 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 ↗

Conservation area about 12 m away: The Greenway

The edge of the area; work outside it can still affect its setting.

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.

1 listed building within 150 m of the postcode pin

Nearest: 1-4, Hogarth Close, Grade II, about 57 m from the postcode pin

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.

Historic England ↗

Also on the record

Heritage at risk about 12 m away: The Greenway, Uxbridge; National infrastructure project about 434 m away: Expansion of Heathrow Airport (Third Runway), at pre-application; Inside the Hillingdon built-up area; Public transport access: PTAL 1b (very poor), TfL 2023, for the 100 m square; Green belt about 50 m away: London.

Not affected

Outside flood zones 2 and 3 · No scheduled monument at the site

Checked on 27 October 2026. The pin for this application is the centre of its postcode rather than the building, so distances to nearby designations are measured from the postcode and can be out by the width of the postcode area. 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.

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Important details

Council: Hillingdon
Received: 9 Oct 2026
Validated: 21 Oct 2026
Ward: UXBRIDGE 2022
Case officer: Show
Target decision: 16 Dec 2026
Agent: Show

Decision outlook

Day 7 of the 56-day target. Hillingdon usually decides extensions by day 54.

prediction

Day 749 days to the 56-day target

66%decided within 8 weeks

91%approved

1,276decided in the last year

Plota live figures for extensions decided by Hillingdon in the last twelve months, from validation. Hillingdon decision record →

Hillingdon

Planning Authority Score

3.5/10

Below average

#219 of 296 councils

Relevant to this application:

Householder decisions

Hillingdon ranks #194 out of 296 councils for householder decision speed. Householder applications are slightly more likely to be approved here (90%) than the national average (90%).

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

Hillingdon decision statistics

Based on MHCLG data, the year to March 2026

85%

Overall approval rate

Below avg (87%) #208 of 296

90%

Householder approved

Above avg (90%) #191 of 296

58%

Decided in 8 weeks

Below avg (63%) #194 of 296

45%

Extended time limit

Above avg (41%) #190 of 296

61%

Minor dwellings approved

67 decided (1-9 homes)

65%

Change of use approved

17 decided

1,680

Total decisions

255 refused in the year to March 2026