Not all building works require planning permission and building regulations approval. This is one of the reasons why we make an initial consultation at the property.
Some extensions are allowed to be built within a client's permitted development rights. This can mean only a building regulations approval is required. Permitted development rights vary between England and Wales and several factors have to be considered including size, positioning, proximity to a highway.
Other factors also include whether the building is listed or built within a conservation area.
If in doubt always seek the advice of your local planning office for confirmation, alternatively arrange for an initial consultation with ourselves to discuss the proposal.