On this page 6 sections
To object to a planning application in Hillingdon, find it on Hillingdon Council's planning portal and comment within 21 days. Quote the reference and stick to material planning considerations. To see every new application as it arrives, use PlanWatch's Hillingdon planning applications page.
Hillingdon receives about 186 planning applications a month by PlanWatch's count, 150 in the last 30 days of our data. Each one has its own comment deadline, usually 21 days from the neighbour letter or site notice.
How Hillingdon Council takes comments
Online, on the planning portal
Search for the application, open it from its reference number, click "Enter comment", fill in the required details and click "Submit comment". The council calls online the "quickest way" to comment. Open the Hillingdon portal.
Hillingdon Council's comment pages give no email or postal address for planning comments, so use the portal.
Checked on Hillingdon Council's own pages on 27 October 2026: pre.hillingdon.gov.uk, pre.hillingdon.gov.uk: Statement of community involvement november 2021, pre.hillingdon.gov.uk. Councils change their process, so check the application's own page for its closing date.
Hillingdon planning in numbers
PlanWatch reads Hillingdon's planning register regularly. It recorded 1,089 applications from April 2026 to 21 October 2026.
| Measure | Hillingdon |
|---|---|
| Applications recorded | 1,089 (about 186 a month) |
| Received in the last 30 days of data | 150 |
| Already decided | 30% (332) |
| Still awaiting a decision | 730 |
| Approval rate, recorded outcomes | 89% of 323 approve-or-refuse decisions |
What Hillingdon residents apply for
| Type of work | Applications | Share |
|---|---|---|
| Extensions | 460 | 42% |
| Lofts, dormers and roof extensions | 206 | 19% |
| Demolition | 125 | 11% |
| Trees | 70 | 6% |
| Change of use and conversions | 60 | 6% |
Types are read from each application's description, so one application can count under more than one. 152 were follow-up paperwork (discharging conditions, amendments), which is rarely worth an objection.
Recent Hillingdon applications
The newest Hillingdon applications PlanWatch holds that are still awaiting a decision. Comments may still be open on these: the closing date is on each one's council page.
| Reference | Where | Proposal | Status |
|---|---|---|---|
| 26353/APP/2026/2460 | Berwick Avenue, Hayes | Conversion of roof space to habitable use to include a rear dormer and 3 front roof lights (Application for a Certificate of Lawful Development… | Awaiting decision, received 21 October 2026 |
| 40350/APP/2026/2449 | Myddleton Road, Uxbridge | Proposed extension of roof through a rear dormer. Rooflights to front of main roof. Alterations to ground floor and first floor fenestration.… | Awaiting decision, received 20 October 2026 |
| 27099/APP/2026/2444 | Wimborne Avenue, Hayes | Erection of a part single part two storey rear extensions, a part single part two storey side extension, and a front porch | Awaiting decision, received 19 October 2026 |
| 60571/APP/2026/2445 | Park Avenue, Ruislip (HA4) | Erection of a front porch extension and erection of an outbuilding to the rear garden for use as a garden store (Application for a Certificate of… | Awaiting decision, received 19 October 2026 |
Recently decided
| Reference | Where | Proposal | Decision |
|---|---|---|---|
| 7848/APP/2026/2377 | Mansfield Drive, Hayes | Proposed development of the conversion of the existing roof space to habitable use, including a hip-to-gable roof enlargement, rear dormer… | Approved (received 9 October 2026) |
| 9528/APP/2026/2365 | Burleigh Road, Hillingdon | Proposed hipped to gable loft conversion with rear dormer, a side facing window and 2 front roof lights (Application for a Certificate of Lawful… | Approved (received 8 October 2026) |
| 10951/APP/2026/2335 | Parkfield Avenue, Uxbridge | Proposed conversion of roof space to habitable use to include a hip to gable extension, rear dormer, gable end window and 3 front roof lights… | Approved (received 5 October 2026) |
We show the street or area only, never a house number or anyone's name. Search your postcode on the Hillingdon planning page to see what's near you.
What you can object to
An objection only counts if it is about a material planning consideration. Loss of value, a private view, competition or who the applicant is do not count. Most Hillingdon applications are extensions and lofts, dormers and roof extensions, so these are the grounds that come up most here:
Also: overbearing impact, construction disruption, trees, noise and disturbance, traffic and parking, drainage and flooding. Then write it up with the objection letter guide or the template. Numbers alone rarely decide it: see how many objections stop an application.
Get alerted before the comment deadline
The 21-day clock starts when Hillingdon Council notifies neighbours or puts up the site notice, not when you happen to notice the scaffolding. PlanWatch reads the Hillingdon register regularly and adds new applications as they appear. Search your postcode free, save it to a free account, and on a paid plan get an email within hours of a new application near you reaching the register, while there is still time to comment.
Check your Hillingdon postcode
Already found the application? If you think the decision was wrong, read whether you can object after approval.
Turn this guide into your objection letter — £9.99
Tell the Objection Letter Builder which application concerns you and why, and it drafts a formal letter around the material planning considerations covered here — ready to review and submit to your council. One-off £9.99, free on Pro & Business plans.
Build my objection letterObjecting in Hillingdon: questions
How long do I have to object to a planning application in Hillingdon?
Hillingdon Council gives 21 days to comment: Hillingdon's adopted Statement of Community Involvement (2021) says comments are due "usually within 21 days of the date of the notification letter, or 21 days from the date of a press notice or site notice appearing." The end date is usually shown on the application's page.
Can I object to a Hillingdon planning application by email?
Hillingdon Council asks for comments online on the planning portal; it does not publish an email address for planning comments. Search for the application, open it from its reference number, click "Enter comment", fill in the required details and click "Submit comment". The council calls online the "quickest way" to comment.
Will Hillingdon Council publish my objection?
Yes. "All comments are open to the public by law" and "the comments you make will not be redacted", although some personal data is hidden, so leave sensitive details out.
Can I speak at the Hillingdon planning committee?
Residents usually get to speak at Planning Committee through a valid planning petition. Hillingdon's petitions page says a petition submitted before 31 October 2026 needs at least 20 Hillingdon residents' signatures, and from 31 October 2026 at least 50. It also says national reforms from 31 October may change whether a petition brings a chance to speak, with details to be published before they take effect.
How many planning applications does Hillingdon get?
PlanWatch recorded 1,089 planning applications for Hillingdon from April 2026 to 21 October 2026, about 186 a month, 150 of them in the last 30 days of that period. Of the 323 with a recorded approve-or-refuse outcome, 89% were approved.
Disclaimer: PlanWatch provides general information about UK planning processes. This content is not legal advice. Check the application's own page on the Hillingdon portal for its closing date.