Windows & doors in Dacorum: Planning Permission Guide
A guide to replacing windows and doors in Dacorum — when you need planning permission and typical costs.
Based on 38 decided applications in Dacorum over 24 months (33 granted, 5 refused).
Dacorum has 23 conservation areas, and Green Belt land covers much of the borough — both place properties on permitted-development restrictions. Around 920 listed buildings are recorded across the borough.
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5 nearest comparables & refusal reasons for your address.
Get my report — £29See a sample →Recent windows & doors decisions in Dacorum
The 5 most recent decided applications. Addresses redacted to postcode area.
New timber sash windows.
Conversion of existing storey into a study and utility room, alterations to the rear fenestration, insertion of a window and enlargement …
Replacement of existing windows with heritage style uPVC sash windows.
Replacement of conservatory roof with a solid panel roof and replacement of existing glazing on left hand side of existing conservatory w…
Replacement of glazed conservatory roof with a tiled roof, and replacing glazed elevations with brickwork and windows.
These are borough-wide. See the 5 nearest to your address.
Get my report — £29Permitted 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 East of England
Window and door costs depend on the number of openings, material choice, and style.
Typical total
Typically includes
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Highly variable depending on number of windows, material (UPVC vs timber vs aluminium), and style. Per-window costs typically £450–£1,300.
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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Run our free 2-minute check to see whether your project likely qualifies as permitted development in Dacorum. For personalised approval odds and nearby comparables, get the £29 report.
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