Permission to externally insulate a property

1. Planning Permission

You must submit the following online form to check if you need planning permission which will be reviewed by a planning officer and they will give you an informal response within 20 working days. 

You will need the following information:

• Your details
• Site details
• You will need to note on the form if the property is in a conservation area
• You will need to note on the form if the property is a listed building
• Information about the proposed work including:
  • the materials you intend to use
  • dimensions in metres
  • location from neighbours/road
  • detailed sketch showing any trees on the site

 Extending / changing your home (gov.wales) 

2. Building Control

You will also need to complete a building control application for these works

thermal elements application 

3. Permission to work on the highway

If your property does not have a front garden, and abuts the pavement, you should seek consent from us prior to carrying out external insulation works. In appropriate locations the consent will allow the construction of a building over a highway maintained by us.​

To make an application you will need to provide the following:

• Address of property affected by proposed works
• Road number (if known)
• Identify areas of the highway affected - verge/footway/carriageway/back lane
• Description of works
• Estimated duration of works
• Proposed start date of works
• Proposed end date of works
• Width of existing footway/carriageway (approx)
• Width of works (approx)
• Projection over the highway (approx)
• Clearance above highway level
• Name, address and telephone number of contractor
• Provide policy number and expiry date of insurance policy with an indemnity of no less than £10 million
• Plan of site - property and proposed works to scale of no less than 1/500
• Plan of location in relation to its surroundings to scale of no less than 1/1250 or 1/2500 or 1/10,000

The application fee is £51 (valid until 31st March 2025).

Please allow 6 to 8 weeks for your application to be assessed.

Download application form (.pdf)