Windows & doors in Hillingdon: Planning Permission Guide
A guide to replacing windows and doors in Hillingdon — when you need planning permission and typical costs.
Based on 27 decided applications in Hillingdon over 12 months (27 granted, 0 refused).
Hillingdon has substantial Green Belt covering its western fringes, including Harefield, Ruislip Woods, and the Colne Valley Regional Park. Conservation areas include Harefield Village, Ruislip Village, Ickenham Village, and Uxbridge. Listed buildings cluster around St Mary's Harefield and the historic village cores. Heathrow noise contours affect planning for certain projects in the south. Flood zones apply along the Colne and Frays rivers.
Personalised odds
5 nearest comparables & refusal reasons for your address.
Get my report — £9See a sample →Recent windows & doors decisions in Hillingdon
The 5 most recent decided applications. Addresses redacted to postcode area.
Alteration to existing shopfront to create an additional entrance door for new subdivided unit (internal subdivision permitted under Clas…
Replacement of the entrance door on like-for-like basis
Replacement of the entrance door on like-for-like basis (Application for Listed Building Consent)
Amendments to fenestration consisting of the installation of 1 window to the side
Additional access into the site at the front, with widening of the existing access road with fencing; erection of a canopy and welfare un…
These are borough-wide. See the 5 nearest to your address.
Get my report — £9Permitted Development Rules
Replacing or adding windows/doors may need planning permission in conservation areas or for listed buildings.
Replacing windows and doors like-for-like generally doesn't need planning permission. However, in conservation areas or listed buildings, changes to the appearance of windows and doors may require consent.
Typical Costs in London
Window and door costs depend on the number of openings, material choice, and style.
Typical total
Typically includes
Typically excludes
Highly variable depending on number of windows, material (UPVC vs timber vs aluminium), and style. Per-window costs typically £500–£1,500.
Get a personalised cost estimate based on your actual windows & doors dimensions.
Get my estimateWhich Professionals Do You Need?
Window replacements rarely need professional services. Suppliers typically handle measurement, manufacture, and installation.
This project is unlikely to need specialist professional services beyond a competent builder.
This type of project does not typically require architectural services.
This guidance is based on a typical semi-detached house with no special constraints. Listed buildings, conservation areas, and attached properties may require additional professional input.
Find out exactly which professionals you need for your windows & doors.
Get personalised guidanceConservation Areas & Listed Buildings
In conservation areas, changing window materials (e.g. timber to UPVC) or styles may need planning permission. Listed buildings always need Listed Building Consent for any window or door changes.
Properties in conservation areas often have reduced permitted development rights. Some project types (like side extensions) lose PD rights entirely. An Article 4 Direction can remove additional PD rights.
Listed buildings (Grade I, II*, or II) have no permitted development rights at all. Any external alteration requires Listed Building Consent in addition to any planning permission. An architect experienced in heritage work is essential.
Check if your property is in a conservation area or has other planning constraints.
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