Free UK planning guidance

Build Hub's free AI planning guidance helps UK homeowners understand whether a project is likely to fall under permitted development, need prior approval, or require a full planning application — drawing on the Planning Portal, GOV.UK and the National Planning Policy Framework. Ask about rear and side extensions, loft conversions, outbuildings, listed buildings and conservation areas.

Permitted development vs planning permission

Many smaller projects fall under permitted development rights, but these are removed or restricted in conservation areas, for listed buildings, and under Article 4 directions. The only way to be certain is a Lawful Development Certificate from your local planning authority. See our help and FAQ and cost guides to plan your project.