Windows & doors in Hounslow: Planning Permission Guide
A guide to replacing windows and doors in Hounslow — when you need planning permission and typical costs.
Based on 67 decided applications in Hounslow over 12 months (60 granted, 7 refused).
Hounslow has conservation areas around Chiswick (including the Bedford Park fringe shared with Ealing), Brentford, Isleworth, and Syon. Listed buildings are concentrated around Syon House, Osterley Park, Chiswick House, and Boston Manor. Article 4 Directions cover parts of Chiswick and Brentford. Flood zones apply along the Thames, particularly around Brentford and Isleworth. Heathrow noise contours affect some planning considerations in the west.
Recent windows & doors decisions in Hounslow
The 5 most recent decided applications. Addresses redacted to postcode area.
Erection of canopy encompassing three padel courts and the installation of two outdoor padel courts. Erection of two single storey shipp…
Replacement of all the existing windows on the first floor, second floor and third floor.
Installation of one non-illuminated box fascia sign, two illuminated box fascia signs, and one internal glazing store directory vinyl.
Replacement of the existing single glazed windows on the rear and front elevations with double glazed windows to match existing.
Replacement of all the windows and doors with new double glazed windows and doors to the house.
These are borough-wide. See the 5 nearest to your address.
Check your address freePermitted 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.
Check my propertyFrequently Asked Questions
Just want a quick yes/no for your windows & doors?
Run our free 2-minute check to see whether your project likely qualifies as permitted development in Hounslow — your address, your constraints, your council's own recent decisions.
Free 2-min check