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In many cases, extensions can be built without the need for a planning application. You are required however to have Architectural plans created for building control approval. We also strongly recommend submitting plans to the council for approval in the form of a certificate of lawful development. Whether or not planning permission is required.
As with many extensions, a loft can often be converted without the need for a planning application. Loft conversions do require architectural assistance however to ensure building and fire regulations are correctly abided by for building control approval.
In some cases, you can create a garden room without the need for a planning application or building control approval. We do always recommend submitting a permitted development application to the council for official approval of the design