North Northamptonshire Council is the local planning authority. It is a unitary council, so planning, building control and the roads all sit with the same authority.
Twenty six conservation areas
The Kettering area has 26 conservation areas and 538 listed buildings, which is a substantial amount of designation for a town of this size, and it means the designation check is not a formality here. Inside a conservation area the permitted development limits reduce and a side extension loses its permitted development rights entirely.
The nineteenth century suburbs
What makes Kettering distinctive from a planning point of view is that its Victorian suburbs survive little altered from when they were laid out. That is exactly why several of them are designated, and it changes what the council is looking at. In a street where the original pattern is intact, an alteration that would pass without comment on a mixed street is conspicuous, and the more coherent the street, the less tolerance there is for breaking the rhythm.
The corollary is useful: work behind the building line is a much easier conversation than work in front of it, and that is where most of what people want actually sits.
Everything else
On the interwar, post-war and modern housing the ordinary rules apply and a single storey rear extension often falls within permitted development. Permitted development is not an exemption from Building Regulations, 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.