Advice · 4 min read · Updated 6 November 2026
Can my floor take a heavy machine? UK floor loading explained
The two numbers that matter
Floors are rated in two ways. A uniformly distributed load, written in kN per square metre, is the weight the floor can carry spread evenly across its area. A point or concentrated load, written in kN, is the weight it can carry on a small area such as a single machine foot. One kN is roughly 100 kg.
A machine can be within the floor's overall rating but still overload it at the feet. A 4 tonne press on four small feet puts around 1 tonne on each foot, which may punch through or crack a thin slab even though the floor's spread rating looks comfortable.
Typical UK design floor loads
These are typical imposed loads used in UK design guidance. Your own building may have been designed higher or lower, so treat them as a starting point, not a guarantee.
| Floor use | Typical design load | Roughly per square metre |
|---|---|---|
| Domestic floors | 1.5 kN per square metre | 150 kg |
| General offices | 2.5 to 3 kN per square metre | 250 to 300 kg |
| Light storage mezzanines | Often 2.5 to 7.5 kN per square metre | 250 to 750 kg |
| Light industrial ground slab | Often 10 kN per square metre or more | 1 tonne or more |
| Heavy industrial ground slab | Designed per project | Varies widely |
Mezzanine floors usually carry a load notice. If there is no notice and no drawings, assume nothing and get it checked.
How to check your floor, step by step
- Find the machine's total weight, including oil, coolant and tooling, plus the number and size of its feet
- Look for load notices on mezzanines and racking, and ask the landlord or building owner for structural drawings
- Find out the slab thickness and whether it is reinforced, for example from drawings, a core sample or an existing drilled hole
- Check for joints, cracks, drainage channels, trenches and pits near the new position
- Ask a structural engineer to assess upper floors, mezzanines and any slab under a heavy point load
- Plan spreader plates or a new plinth if the engineer recommends it
Ways to make a floor work
- Steel spreader plates or levelling pads under each foot to reduce point loads
- Positioning the machine close to columns, beams or load-bearing walls
- A new reinforced concrete plinth cast for the machine, isolated from the main slab where vibration matters
- Strengthening a mezzanine with extra beams or columns before the move
- Choosing a ground-floor position for the heaviest equipment
Presses, large CNC centres and heavy grinders often need their own foundation for accuracy as well as strength. Ask the machine supplier for the foundation drawing, as many manufacturers publish one.
Do not forget the route
The floor the machine passes over matters as much as where it ends up. A machine on skates concentrates its weight onto small rollers, and a loaded forklift puts a large share of the combined weight on its front wheels. Drain covers, service trenches, ramps, loading bay plates and tiled or resin-coated floors can all be damaged on the way in.
Movers often lay steel plates or heavy plywood along the route to spread the load and protect finishes. Mention any known weak spots when you ask for a quote so this can be planned.
What to send your engineer and mover
The quickest way to get a clear answer is to give the engineer and the mover the same information at the start. Missing details are the main reason checks drag on or come back with cautious, expensive recommendations.
- Machine make, model and total operating weight, ideally from the manufacturer's data sheet
- Number, size and spacing of the feet or levelling pads
- Any foundation drawing or installation guide from the manufacturer
- Photos of the floor surface, joints and cracks at the new position
- Drawings, load notices or previous survey reports for the building
- Whether the machine vibrates, impacts or cycles heavily in use, as with presses
If the engineer approves the position with conditions, such as spreader plates of a certain size, pass those conditions to the mover in writing so they form part of the method statement.
Leased buildings and permission
If you rent the unit, your lease may limit floor loading or ban alterations such as fixing machines down or cutting new foundations. Check the lease and get the landlord's written consent before the move, especially for upper floors and anchoring. Damage to a slab can become a dilapidations claim at the end of the lease.
Frequently asked questions
How much does a structural engineer cost to check a floor for a machine?
For a straightforward check of one position, many UK engineers charge somewhere around £300 to £900 for a visit and short letter or calculation. A full assessment of a mezzanine, or a design for a new machine foundation, usually costs more. Having the machine's weight, foot sizes and any building drawings ready keeps the time, and the fee, down.
Can I put a heavy machine on a mezzanine floor?
Only if the mezzanine has been designed for it or checked by a structural engineer. Most storage mezzanines are designed for spread loads from racking and goods, not for heavy point loads from machine feet or the vibration some machines produce. Check the load notice, find the original design information and get an engineer's sign-off before anything heavy goes up.
Will a heavy machine crack a concrete floor?
It can, particularly where the slab is thin, unreinforced, already cracked or near a joint. Concentrated loads at machine feet are the usual cause. Spreader plates, positioning away from joints and edges, and a dedicated plinth for the heaviest machines all reduce the risk. If in doubt, an engineer can confirm what the slab can take.
floor loading mezzanine structural engineer point loads
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