Planning Permission Checker

In most cases, you do not need planning permission to replace windows in the UK. Window replacement is generally covered by Permitted Development rights, allowing you to change windows without applying for planning permission. However, there are important exceptions: listed buildings always require Listed Building Consent, and properties in conservation areas may need permission if you are changing the appearance, material, or style of the windows. You will always need building regulations approval, which is typically handled by using a FENSA-registered installer.

Yes, you can change windows in a conservation area, but there are restrictions. Like-for-like replacements (same material, style, and colour) generally do not require planning permission. However, if you want to change the material (e.g., timber to uPVC), style, or colour of your windows, you will likely need planning permission from your local authority. Some conservation areas have Article 4 Directions that remove permitted development rights entirely.

For standard houses that are not listed or in a conservation area, you generally do not need planning permission to change window style. You can switch from sash windows to casement windows, change from timber to uPVC, or alter the colour without planning permission under Permitted Development rights. However, if your property is in a conservation area, changing the style or appearance typically requires planning permission.

Planning permission and building regulations are two separate legal requirements. Planning permission controls what you can change about the appearance and use of your property. Building regulations set minimum standards for thermal performance, safety, and ventilation, and are always required for replacement windows. The simplest way to comply with building regulations is to use a FENSA-registered installer, who will self-certify the work and notify your local authority automatically.

Yes, creating a new window opening typically requires planning permission. Unlike replacing existing windows, adding a new window involves altering the external structure of your building. This applies regardless of whether your property is listed or in a conservation area. You will need to submit a planning application, which typically costs around £258 for householder applications in England.

FENSA (Fenestration Self-Assessment Scheme) is a government-authorised scheme that allows registered installers to self-certify that their window and door installations comply with building regulations. When a FENSA-registered installer completes your window replacement, they automatically notify your local authority and provide you with a compliance certificate. This certificate is essential when selling your property. If your installer is not FENSA registered, you must arrange a building control inspection separately, which typically costs £200-£400.