Mezzanine floor design
A mezzanine is designed around four numbers: the height you have to the roof, the load the floor must carry, the column grid you can live with below, and how far anyone upstairs will be from a staircase. Get those right at the start and the drawings, the price and the building control application follow. Installers usually design the floor for free as part of quoting, so you can compare layouts from more than one firm.
A free matching service, not a mezzanine floor installer. We find one who covers your area and tell you who they are before anything is shared. How it works
What to know before the designer visits
- The height from floor to the underside of the roof steel, lights and sprinklers.
- What will go on the floor, how heavy it is and how it gets there.
- Where columns cannot go: aisles, dock doors, machines, drains.
- How many people will work upstairs and whether the public will ever use it.
- Where staircases could land so routes out stay short.
- Whether the building has sprinklers, smoke detection or a fire strategy already.
Design and approval costs
| Job | Typical price |
|---|---|
| Design, calculations and building control Per project; often folded into the installer's price | £1,500 to £4,000 |
| Design, calculations and application, example The Mezzanine Company 60 m² example project | £1,900 |
| Structural engineer, if appointed separately Published range, Pallite | £2,000 to £8,000 |
| Building Control fees Published range, Pallite | £1,500 to £4,000 |
Figures from Pallite (May 2026) and The Mezzanine Company (July 2026), read 26 October 2026. Some installers, such as Western Industrial, say they handle the application at no extra charge. Figures exclude VAT at 20%, which most VAT-registered businesses can reclaim. A guide, not a quote. The cost calculator prices the whole floor.
What a good quote includes
Ask for these six points in writing. Two quotes that cover them can be compared line by line.
Clear heights
At least 2.4 m of working clearance above and below the deck is a common target, which points to about 5.5 m to the eaves as a practical minimum.
Structure depth
Beams and deck take a few hundred millimetres: kit drawings show a 2.5 m floor level leaving about 2.1 m below.
Column grid
Light kits use bays of roughly 3 to 5 m; wider grids need deeper beams. Concrete decks can span much further.
Load rating
3.5 kN/m² for offices, 4.8 kN/m² for general storage, 6.0 kN/m² and up for pallets and production.
Stairs and guarding
Utility stairs rise 150 to 190 mm with a 250 to 400 mm going; guarding at floor edges is 1100 mm in factories and warehouses.
Escape and fire
Travel distances from Approved Document B, and the fire-rated ceiling, fascia and casings if the floor is not a small storage floor.
Want a mezzanine designed for your building? Tell us about it and we will find an installer who designs and quotes.
Ask for a free quoteHow mezzanine design usually works
Brief
You explain the use, the loads, the people and the constraints. Photos and any building drawings help.
Survey
The designer measures heights, column and door positions, lights, sprinklers and the slab.
Layout options
One or two layouts with deck size, grid, stair and gate positions, and the clear heights that result.
Calculations and drawings
Structural calculations and general arrangement drawings, with the design load stated, for building control.
Approval
Building control approves the plans, inspects on site and issues a completion certificate at the end.
Questions people ask
What is the minimum height for a mezzanine floor?
There is no single legal minimum, but Pallite suggests 2.4 metres of clearance above and below the deck and about 5.5 metres to the eaves. Escape routes need at least 2 metres of headroom under Approved Document K.
How far apart are mezzanine columns?
It depends on the load and beam depth. Published kit drawings from a UK kit supplier show grids of about 2.9 to 4.8 metres for a 500 kg per m² floor. Lloyds Beal quotes concrete decks spanning up to 18 metres.
What is BRE Digest 437?
A BRE design guide for industrial platform floors. It allows storage mezzanines in warehouse-type buildings to be designed for lower loads than the general code, provided there is a management document and loading notices, as Jersey's building control guidance sets out.
Who designs a mezzanine floor?
Usually the installer, using its own or a consulting structural engineer. Large or unusual floors, or floors tied into the building frame, may need an independent engineer. Either way, the calculations go to building control.
Do I need building regulations approval for a mezzanine?
Yes, in almost every case. A mezzanine adds structure and changes how people escape in a fire, so it is building work under the Building Regulations. The installer usually prepares the drawings and calculations and makes the application to the council or a registered building control approver.
Does a mezzanine need fire protection?
It depends on use and size. Approved Document B lets small storage-only floors used by few people go without fire-rated construction. Industry guidance such as Western Industrial's fire protection guide reads the limits as storage only, under 20 metres in every direction and no more than half the floor area below; once a floor is bigger, used as offices or production, or open to the public, a fire-rated ceiling and column casings are normally needed. Building control has the final say.
Get free mezzanine design and quotes
Three short steps: where the building is, what the floor is for, and how to reach you. It takes about two minutes, and rough answers are fine.
This is a free matching service, not a mezzanine floor installer. We find one who covers your area and name them to you first. Nobody contacts you until you say yes.
Thanks, your enquiry is in.
- Within one working day we will email or call to tell you which mezzanine floor installer covers your area.
- Your details reach that firm only if you say yes.
- They look at the site and give you a fixed price. No marketing from us, ever.