
New windows could be on the cards this summer – but check the rules (Image: bymuratdeniz via Getty Images)
As climate extremes become the new normal for the UK, many homeowners will be looking at ways to keep their homes cooler, whether that’s upgrading windows, improving insulation or investing in solar panels and heat pumps. However, before making changes, property owners should understand whether planning permission or other building approvals may be required for the project, said John Van Eker, principal town planner at Planning Portal, which is a partnership between the Ministry of Housing, Communities and Local Government and TerraQuest.
He said: “Many of the improvements people consider during the summer months can involve a significant investment, so it’s important to understand any planning requirements before work begins. While many projects may fall under permitted development rights, this isn’t always the case, particularly for listed buildings, properties in conservation areas and homes located in National Parks or areas of outstanding natural beauty. Checking the planning position early can help homeowners avoid unexpected delays, additional costs and potential complications further down the line.”
Before starting work, homeowners should consider the following, John said.
Rules in England for replacing windows
Upgrading to double or triple glazing can improve comfort throughout the year and help reduce heat entering the home during warmer periods. While like-for-like replacement windows will not usually require planning permission, a change in materials and appearance usually will require planning permission and additional controls apply to listed buildings and designated areas.

Some changes might need permission (Image: bymuratdeniz via Getty Images)
Rules for adding insulation
Improving loft, floor or wall insulation can help regulate indoor temperatures and reduce energy use. Internal works generally won’t require planning permission, but external insulation may require approval if the work changes the external appearance of the property, particularly in protected areas or where the building is listed.
Rules for external shutters and awning
Adding external shutters and awning can be seen as a form of development and require planning permission depending on where they are located. Even a retractable awning could require a planning application.
Rules for installing solar panels
Some domestic solar panel installations can be carried out under permitted development rights, although homeowners should still check whether conditions or restrictions apply. Homes in designated areas such as conservation areas and AONBs face additional restrictions when it comes to adding solar panels.
Considering a heat pump
Air source and ground source heat pumps are becoming increasingly popular, but homeowners should understand the relevant planning requirements before installation, particularly where location or visual impact may be a consideration. The type of property and where the heat pump is located will play a factor here to ensure the installation meets the right requirements.
Checking the requirements of your project
Many energy-efficiency improvements can be carried out without planning permission, but certain requirements can vary significantly between properties. For homeowners seeking initial guidance, Planning Portal offers a range of advice, resources and tools to help them get started.
Those seeking formal confirmation that their proposed work is permitted can apply for a Lawful Development Certificate through the Planning Portal. This provides a legally recognised decision from the Local Planning Authority confirming that the development is lawful and does not require planning permission. It is also possible to book an appointment with Planning Portal’s Planning Guidance Service.
