122 Windsor Avenue Hillingdon Data via plota.co.uk

16406/APP/2026/721 Approved
Extensions & alterations

Proposal

Conversion of existing attached garage to habitable use and erection of a single storey rear extension Data via plota.co.uk

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View original council record ↗Last checked

Application progress

✓
Received
23 Mar 2026
✓
Approved
14 May 2026

Approved on 14 May 2026 · Last checked 10 Aug 2026

Documents

View the documents on the council's website ↗

Site constraints 3

Article 4 direction
Residential extensions. Named permitted development rights are withdrawn here.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 ↗
Also on the record
Inside the Hillingdon built-up area.
Not affected
Outside flood zones 2 and 3 · Not green belt · No scheduled monument at the site

Checked on 11 September 2026. Historic England, the Environment Agency, Natural England 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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Other new applications on this street

10 Apr 2026Approved

30 WINDSOR AVENUE HILLINGDON

Proposed garage conversion, single-storey rear extension, and internal alteratio...

20904/APP/2026/908
10 Apr 2026Approved

69 WINDSOR AVENUE UXBRIDGE UB10 9AU

Erection of a single storey rear extension (Application for a Certificate of Law...

79832/APP/2026/903

Nearby new applications

11 Aug 2026Approved

3 DENECROFT CRESCENT UXBRIDGE UB10 9HU

Conversion of roof space to habitable use to include a rear dormer, 2 roof light...

80215/APP/2026/1982
11 Aug 2026Pending

3 DENECROFT CRESCENT UXBRIDGE UB10 9HU

Erection of a single storey rear extension

80215/APP/2026/1983
6 Aug 2026Approved

57 DENECROFT CRESCENT UXBRIDGE UB10 9HX

Erection of a single storey rear extension, which would extend beyond the rear w...

80082/APP/2026/1947
20 Jul 2026Pending

Test Road Hillingdon

Test

71790/APP/2026/1770
2 Jul 2026Approved

13 HOLM GROVE HILLINGDON UB10 9LZ

Conversion of integral garage to habitable accommodation

80160/APP/2026/1661
30 Jun 2026Approved

73 WOODCROFT CRESCENT HILLINGDON UB10 9JD

Erection of a single storey rear extension, which would extend beyond the rear w...

80156/APP/2026/1636

Important details

Council
Hillingdon
Postcode
UB10 9ET
Received
23 Mar 2026
Validated
23 Mar 2026
Decision
Approval
Decision date
14 May 2026

How this decision compares

Decided in 52 days from validation, about the council's usual 53 days. Approved, as 91% of extensions here are.

66%decided within 8 weeks
91%approved
854decided in the last year

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

Historical activity at this location

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

Within ~100m

Nearby activity

2025 Approved
80 GROSVENOR CRESCENT HILLINGDON UB10 9ET
Erection of a two storey rear extension.
79656/APP/2025/2370
2023 Approved
117 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Erection of a single storey extension to the rear
74760/APP/2023/3247
2023 Approved
106 WINDSOR AVENUE HILLINGDON MIDDLESEX UB10 9BA
Erection of outbuilding in rear garden (Application for a Certificate of Lawful Developme…
77479/APP/2023/3360
2023 Approved
149 WINDSOR AVENUE HILLINGDON UB10 9BA
Erection of a single storey rear extension. Conversion of garage to habitable room with r…
78112/APP/2023/1788
2023 Approved
159 WINDSOR AVENUE HILLINGDON MIDDX UB10 9BA
Erection of a single storey rear extension, which would extend beyond the rear wall of th…
62697/APP/2023/1301
2021 Approved
110 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Erection of a single storey ground floor side/rear extension as previously approved under…
75015/APP/2021/4271
2021 Approved
110 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Single storey side and rear extension (following demolition of existing garage) and singl…
75015/APP/2021/2662
2021 Approved
159 WINDSOR AVENUE HILLINGDON MIDDX UB10 9BA
Single storey side extension (Application for a Certificate of Lawful Development for a P…
62697/APP/2021/3018
2021 Refused
159 WINDSOR AVENUE HILLINGDON MIDDX UB10 9BA
Erection of single storey rear extension which would extend beyond the rear wall of the o…
62697/APP/2021/2937
2021 Refused
159 WINDSOR AVENUE HILLINGDON MIDDX UB10 9BA
Two storey side extension and part two storey part single storey rear extension
62697/APP/2021/1791
2019 Refused
110 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Single storey side extension with dummy pitch roof and demolition of existing front porch
75015/APP/2019/3635
2019 Refused
110 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Single storey side extension
75015/APP/2019/2592
2019 Approved
117 GROSVENOR CRESCENT HILLINGDON UB10 9EU
Conversion of roof space to habitable use to include a rear dormer and 3 front roof light…
74760/APP/2019/1311
2016 Approved
97 GROSVENOR CRESCENT HILLINGDON MIDDLESEX UB10 9ET
Erection of a single storey rear extension, which would extend beyond the rear wall of th…
71537/APP/2016/964
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
Source: MHCLG planning statistics · See full council rankings