Rugby Borough Council is the local planning authority for the town and the surrounding villages, and planning applications and building control both go through the council. You can use an approved inspector for building control instead if you prefer.
Many single storey rear extensions on the semi-detached housing around the town fall within permitted development, which means no planning application is needed. Permitted development is not an exemption from Building Regulations though, and a full plans application is still required. We do not make that application, but we arrange and meet the inspections that follow it and we see the work through to sign off.
Three things change the answer in Rugby.
Conservation areas
The borough has 19, and several cover streets we regularly work in: Rugby Town Centre, Rugby School, Bilton Road, the Clifton Road, Hillmorton Road and Whitehall Road area, Old Brownsover, Bilton, Hillmorton Locks, Dunchurch and Clifton-upon-Dunsmore. In a conservation area the council has extra control over what can be done without permission, so we check the designation before drawing anything.
The Article 4 direction
Rugby has one, in force since 23 February 2025, covering the Benn, Coton and Boughton, Eastlands, New Bilton, and Newbold and Brownsover wards. It is worth being clear about what it does, because it is often misread: it requires planning permission to convert a house into a small HMO. It does not restrict ordinary householder extensions. If you are extending your own home in one of those wards, this one does not apply to you.
Party walls
If the work comes close to or against a shared boundary you are likely to need a party wall award. We raise that at quotation stage, not three weeks into the dig.