What to do next
When you have tested your proposed project against the permitted development limits and conditions it is time to decide on your next step.
You have a number of options:
If you are completely sure your project is permitted development you can start your building work.
Read important advice before starting work (https://www.planningportal.co.uk/wales/do-you-need-permission/what-to-do-next/start-your-building-work)Read important advice before starting work
For proof that your building work is lawful you should apply for a Lawful Development Certificate.
Read more about Lawful Development Certificates (https://www.planningportal.co.uk/wales/do-you-need-permission/what-to-do-next/lawful-development-certificate)Read more about Lawful Development Certificates
If your project does not qualify as permitted development you will need to submit a planning application.
Read more about planning applications (https://www.planningportal.co.uk/wales/do-you-need-permission/what-to-do-next/planning-application)Read more about planning applications