This is general guidance based on standard permitted development rights in England. Rules differ for listed buildings, conservation areas, and properties with Article 4 directions. Always confirm with your local planning authority before starting work.
Do I Need Planning Permission for a Replacing Windows (Like for Like)?
Replacing existing windows with new units of the same or similar style. Window replacement is generally considered repair and maintenance but must comply with Building Regulations for energy efficiency.
The General Position
This project is usually allowed under permitted development rights without needing to apply for planning permission, provided certain conditions and limits are met.
Generally permitted. Replacing windows with units of a similar appearance is treated as maintenance and repair. Even changing the frame material (for example, timber to uPVC) is usually PD for standard residential properties, though conservation areas and listed buildings have restrictions.
Conditions and Requirements
- 1Replacement windows must comply with Building Regulations Part L (energy efficiency)
- 2In conservation areas, changes to window materials, style, or proportions may need PP
- 3Listed buildings require listed building consent for any window changes
- 4Work must be carried out by a FENSA-registered installer or with building control approval
Size and Dimension Limits
- Same openings as existing; no change to wall structure needed for like-for-like replacement
When Permitted Development Does Not Apply
- Listed building consent is needed for all window changes on listed buildings
- Conservation areas may restrict changes from timber to uPVC
- Article 4 directions can remove PD rights for window replacement
- Non-compliant windows (not meeting Part L) cannot be certified and create problems when selling
What About Building Regulations?
Building Regulations approval is required for replacement windows. Part L requires minimum thermal performance (U-value). Part N/Part K covers safety glazing in critical locations. Part Q covers security (PAS 24). Most homeowners use a FENSA or CERTASS-registered installer, who can self-certify compliance without a separate building control application.
Building regulations are separate from planning permission. You may need both, one, or neither depending on your project. Building regulations cover the safety and quality of building work, including structural integrity, fire safety, insulation, ventilation, and drainage.
How to Apply for Planning Permission
Check if you need permission
Review the permitted development rules above. If in doubt, contact your council or apply for a Lawful Development Certificate.
Prepare your application
You will need scaled drawings, a site plan, and a completed application form. An architect or planning consultant can help with this.
Submit to your local council
Applications can be submitted online via the Planning Portal or directly to your council. Select your council below for a direct link.
Wait for a decision
Not applicable for like-for-like replacement under PD..
Application cost: £258 if planning permission is required..
What Happens If I Build Without Permission?
Low planning enforcement risk for standard replacements. However, windows installed without Building Regulations compliance (no FENSA certificate or building control sign-off) are a common problem flagged during property sales. Solicitors will request evidence of compliance, and the lack of it can delay or prevent a sale.
Find a Window Fitter for Your Replacing Windows (Like for Like)
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Select Your Council
Choose your local council for guidance specific to your area, including links to apply and whether your council has conservation areas or Article 4 directions that could affect your project.
London
South East
South West
East of England
East Midlands
West Midlands
North East
North West
Yorkshire and the Humber
CA = has conservation areas. A4 = has Article 4 directions. These may restrict your permitted development rights.