Advice · updated November 2026
Do you need Building Regulations approval for a mezzanine?
Yes, in almost every case. A mezzanine is new floor structure, so Building Regulations apply. Planning permission is a separate question and is needed less often.
What Building Regulations cover
- Structure: the floor, columns and the slab they stand on
- Fire safety: fire protection, escape routes and alarms
- Stairs, handrails and guarding
- Access for people who will use the floor
Fire protection
Floors used as offices, production or retail space normally need fire-rated columns, a fire-rated ceiling underneath and protected edges. Some smaller storage-only floors that are not permanently occupied can be exempt. Building control decides, so get it agreed before you order.
Planning permission
Most mezzanines inside an existing building do not need planning permission. Exceptions include large retail mezzanines (in England, those adding more than 200 m² of retail floor space), external changes and changes of use. Check with your council early.
Who applies?
Most mezzanine specialists make the Building Regulations application as part of the job, through the council or an approved inspector. Make sure it is written into the quote, and keep the completion certificate. You will need it when you sell, let or insure the building.
This guide is general information, not legal or professional advice. Check your own situation with a qualified adviser.
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