Do modular buildings need planning permission?
It depends on what the building is for, how big it is and where it goes. A modular building is treated like any other building by the planning system: being built off site doesn't change the rules.
Garden buildings and permitted development
Many garden offices and garden rooms can be built under permitted development, as long as they are used for purposes incidental to the house, are single storey, and meet height and position limits.
Typically that means a maximum height of 2.5m within 2m of a boundary, no more than half the garden covered by outbuildings, and nothing forward of the principal elevation. Listed buildings, conservation areas and national parks have tighter rules.
Commercial, sports and public buildings
Clubhouses, changing rooms, toilet blocks, classrooms and offices usually need full planning permission. Some public bodies and schools have limited permitted development rights for small buildings.
A planning application normally needs location and site plans, elevations, a floor plan and sometimes a design and access statement. We can provide building drawings to support it.
Building regulations
Planning is about whether a building is acceptable in a location. Building regulations are about how it's built: structure, fire safety, insulation, ventilation, drainage and access.
Most buildings with sleeping accommodation, toilets or public use need building regulations approval. Small detached garden buildings under 15m² without sleeping accommodation are often exempt.
Temporary vs permanent
Some sites use temporary planning permission for buildings needed for a fixed period. Because modular buildings can be lifted and moved, they suit this route well.