Please note that insurance policies may differ in their cover.

Buildings insurance / Property Covered

In addition to the structure, a buildings policy covers permanent fixtures and fittings such as baths and toilets, fitted kitchens and bedroom cupboards. Interior decorations are also covered. Policies usually extend to include outbuildings such as garages, greenhouses and garden sheds. Boundary walls, fences, gates, paths, drives and swimming pools may not be covered - you need to check the policy if you need cover for these areas.

The Assosiation of British Insurers has an on-line calculator here

UK property rebuild calculator

It is for guidance only. It is strongly recommended that you consult a professional surveyor