Check both the physical work and whether the proposal is a material change of use under the Building Regulations. That definition is separate from the planning use classes. [1][2]
A planning Class E switch is not the whole answer
Building regulations define particular changes that trigger requirements. Examples include a building becoming a hotel, institution or public building where it was not one before, and a building becoming a shop where it was not previously a shop. Creating dwellings and changing the number of dwellings are also specified cases. [2]
An office-to-shop proposal can therefore stay within planning Class E while needing a separate building regulations assessment. Conversely, do not label every switch between E activities a building-regulations material change of use: compare the actual proposal with regulation 5. [3][2]
Where that definition is met, regulation 6 identifies the requirements that apply. The necessary upgrades depend on the particular change and on whether the whole building or only part is affected. [4]
What the fit-out design needs to cover
Structural work and alterations affecting the building's fire safety, access or relevant services need to be assessed as building work. Replacing finishes is not the same project as removing a wall, forming a new stair or reorganising an escape route. Describe the work accurately before choosing the approval route. [1][5][6]
Coordinate the layout with the technical design. The position of a counter, partition or toilet should be checked against circulation, access and escape arrangements rather than treated as decoration. Building regulations guidance addresses how people enter, use and leave the premises, alongside the applicable technical requirements. [5][6]
A useful drawing package distinguishes what is retained, removed and installed. Include enough information for the building control body to assess the proposal, rather than relying on a planning floor plan to describe every construction detail. [1]
Which building control body is involved?
For work outside the Building Safety Regulator's specified jurisdiction, the routes include local authority building control and a registered building control approver. Higher-risk-building work needs its own jurisdiction check: an ordinary commercial fit-out and work within a qualifying mixed-use higher-risk building should not be assumed to follow identical procedures. [1]
Establish the route before starting controlled work. Planning permission does not replace building regulations approval, and using a private approver does not remove the duty to meet the regulations. [1]
Completion and occupation are different checks
Keep the building control completion documentation with the project record. Operational fire safety remains a separate responsibility: the responsible person needs an appropriate fire risk assessment for the premises as occupied, not merely the design drawings prepared before the fit-out. [1][7]
Published changes from March 2027
The Future Homes and Buildings Standards regulations generally commence on 24 March 2027, with specified higher-risk-building provisions commencing on 24 September 2027 and separate transitional arrangements. The published guidance includes non-domestic energy and building-services changes. [8]
The Future Homes Standard concerns new homes; it is not a blanket requirement to rebuild every shop fit-out to a new-house specification. Check the applicable non-domestic guidance, scope of work and transition dates instead. [8]