Mezzanine floor cost calculator
Enter the floor size and the rates and lump sums from your quotes, all before VAT. Nothing is filled in for you, because there are no reliable public prices for mezzanine floors: the example button loads illustrative assumptions, not market prices. VAT rate (20%) last checked 12 November 2026.
Mezzanine budgets at a glance (illustrative assumptions)
Each row uses the same assumed rates: £100 per m² for structure and decking, £2,500 per staircase, £1,200 per pallet gate, £80 per metre of handrail, £45 per m² of fire protection, £2,000 for lighting, £1,200 for building control and £1,000 for design, plus 10% contingency, with one long side and one short side of the floor open (the other two against walls) and 20% VAT. The middle row has no fire protection, as if the floor met the storage-only concession in Approved Document B. Click a row to open the calculator with those figures filled in, then change them to yours.
| Floor size | Stairs / gates | Handrail (m) | Structure and decking | Everything else | Total before VAT | With VAT | Per m² before VAT |
|---|---|---|---|---|---|---|---|
| 10 m × 5 m (50 m²) | 1 / 1 | 15 | £5,000.00 | £11,350.00 | £17,985.00 | £21,582.00 | £359.70 |
| 10 m × 10 m (100 m²) | 1 / 1 | 20 | £10,000.00 | £14,000.00 | £26,400.00 | £31,680.00 | £264.00 |
| 10 m × 10 m (100 m²), no fire protection | 1 / 1 | 20 | £10,000.00 | £9,500.00 | £21,450.00 | £25,740.00 | £214.50 |
| 20 m × 10 m (200 m²) | 1 / 1 | 30 | £20,000.00 | £19,300.00 | £43,230.00 | £51,876.00 | £216.15 |
| 20 m × 20 m (400 m²) | 2 / 1 | 40 | £40,000.00 | £31,600.00 | £78,760.00 | £94,512.00 | £196.90 |
| 30 m × 20 m (600 m²) | 2 / 2 | 50 | £60,000.00 | £42,600.00 | £112,860.00 | £135,432.00 | £188.10 |
| 40 m × 25 m (1,000 m²) | 2 / 2 | 65 | £100,000.00 | £61,800.00 | £177,980.00 | £213,576.00 | £177.98 |
The pattern matters more than the numbers: stairs, gates, lighting and fees don't shrink with the floor, so small mezzanines cost more per m². In this table the cost per m² falls from £359.70 for 50 m² to £177.98 for 1,000 m², with the same rates throughout.
Mezzanine floor cost calculator: key facts
- A mezzanine budget is more than the floor: in our illustrative 200 m² example the structure and decking is £20,000.00 of a £39,300.00 subtotal. Stairs, gates, handrail, fire protection, lighting and fees make up the rest.
- We don't publish a 'typical' cost per m² for mezzanine floors: there's no official or reliable public source. The calculator uses only the rates in your quotes.
- Fixed items don't shrink with the floor, so small mezzanines cost more per m². With the same assumed rates, 50 m² works out at £359.70 per m² and 1,000 m² at £177.98.
- Divide by the usable floor, not the gross area: stair openings and voids are paid for but can't store anything.
- There is no fixed national building control fee. GOV.UK says local authorities base fees on their costs and private approvers negotiate theirs, so get a quote.
- Fire protection is often the biggest variable. A storage-only floor may not need it if it meets every condition in Approved Document B paragraph 7.7 (England); otherwise budget for it.
- The UK standard rate of VAT is 20% (GOV.UK). Check whether each quote is shown before or after VAT before comparing.
How does the mezzanine floor cost calculator work?
It multiplies your floor area by the structure and decking rate from your quote, adds each extra as quantity × rate or a lump sum, adds your contingency percentage and, if you choose, VAT at 20%. It then divides the total by the floor area and by the usable floor area.
- Floor area = length × width, or the area you enter. Usable floor = floor area − any area you lose to stair openings, voids or plant.
- Structure and decking = floor area × your rate per m², plus any lump sum.
- Handrail metres = open long sides × length + open short sides × width, unless you enter the metres yourself. Then handrail = metres × your rate per metre.
- Every other line = quantity × rate + lump sum. Fire protection uses the floor area if you don't enter a quantity; stairs and gates use 1 if you enter a rate without a quantity.
- Subtotal = all the lines added up. Contingency = subtotal × your percentage. Total before VAT = subtotal + contingency.
- VAT (if ticked) = total before VAT × 20%. Cost per m² = total ÷ floor area; cost per m² of usable floor = total ÷ usable floor.
- Quotes: each quote total ÷ floor area, and the difference from your budget before VAT, in pounds and as a percentage.
The only built-in figure
The VAT rate. GOV.UK says the standard rate of VAT is 20%, covering most goods and services (checked 12 November 2026). Everything else comes from you. Whether you can reclaim the VAT depends on your business's VAT position, so ask your accountant.
What you enter, what it assumes and what it leaves out
- Inputs: length and width in metres, or floor area in m²; how many long and short sides are open; area lost to openings; and from your quotes: structure and decking (£ per m² and/or lump sum), staircases, pallet gates, handrail (metres), fire protection (m²), each as quantity × rate and/or lump sum; lump sums for lighting, sprinklers, building control, design and calculations, installation and a floor slab check or other items; contingency %; VAT on or off; up to three quote totals.
- Assumptions: all figures you enter are before VAT; a rectangular floor; the longer dimension is the "long side"; contingency applies to every line, fees included; VAT applies to the whole total.
- Exclusions: no market prices of any kind; no structural, fire or regulatory check (the calculator can't tell you whether you need fire protection or how many stairs); no slab strengthening, racking, shelving, goods lifts, conveyors, electrics beyond what you enter, removal of existing fittings, business disruption or finance costs. Add any of those as "other items".
- Pre-filled links:
len,widorarea;open_long,open_short(0-2);lost;rateandstruct(structure rate per m² and lump sum);stairs,stair_rate,stair_lump;gates,gate_rate,gate_lump;rail_m,rail_rate,rail_lump;fire_m2,fire_rate,fire_lump;lighting,sprinklers,bc,design,install,other(lump sums);cont(%);vat=yesorno;q1,q2,q3(quote totals). The result shows when the page opens. For example, this link opens the worked example below with two example quotes (all illustrative figures).
What does a worked mezzanine budget look like?
Using illustrative assumed rates, a 20 m × 10 m storage floor with one long and one short side open comes to £39,300.00 of items, £3,930.00 contingency and £43,230.00 before VAT, or £51,876.00 with VAT: £216.15 per m² before VAT.
| Line | Assumed quantity × rate | Cost |
|---|---|---|
| Structure and decking | 200 m² × £100 | £20,000.00 |
| Staircase | 1 × £2,500 | £2,500.00 |
| Pallet gate | 1 × £1,200 | £1,200.00 |
| Handrail | 30 m (20 m + 10 m open) × £80 | £2,400.00 |
| Fire protection | 200 m² × £45 | £9,000.00 |
| Lighting | lump sum | £2,000.00 |
| Building control | lump sum | £1,200.00 |
| Design and calculations | lump sum | £1,000.00 |
| Subtotal | £39,300.00 | |
| Contingency | 10% of subtotal | £3,930.00 |
| Total before VAT | £43,230.00 | |
| VAT | 20% | £8,646.00 |
| Total with VAT | £51,876.00 | |
| Cost per m² | £43,230.00 ÷ 200 m² | £216.15 (£259.38 with VAT) |
Usable floor. If the staircase lands through a 6 m² opening in the deck, only 194 m² can be used, and the cost per m² of usable floor rises to £222.84 before VAT.
Comparing two quotes. Suppose Quote A is £41,000.00 and Quote B is £47,500.00, both before VAT. Quote A is £2,230.00 (5.2%) below the budget and Quote B is £4,270.00 (9.9%) above it. That doesn't make A better value: first check whether A includes fire protection, building control and design. Sprinklers and a slab check are blank in this budget, so the calculator lists them as not yet included.
What do mezzanine floor quotes often leave out?
Quotes often price the structure, decking, stairs and handrail but leave out building control fees, fire protection, lighting, sprinkler changes and a check of the ground-floor slab. Ask each supplier to say clearly what is included and what is excluded.
The calculator lists any line you've left at zero. Before you compare prices, go through each quote with this list.
- Building control. Most mezzanines in England are building work under the Building Regulations. For a workplace, the regulations require a full plans application. Is the fee included, and who makes the application? See full plans and sign-off.
- Fire protection. Fire-resisting ceilings, column casings and fascias, unless the floor meets every condition of the storage-only concession (see the next section).
- Stairs. How many, what type and where. A storage floor used every day needs proper industrial stairs; escape distances may need a second one.
- Edge protection and loading points. Handrail with intermediate rails and kick plates on every open edge, and a pallet gate at each loading point. HSE's warehouse guidance says chains and tape are not edge protection.
- Lighting. Under the deck, where roof light is lost, and on top of it.
- Sprinklers. If the building has them, a solid deck can stop roof sprinklers protecting the area below. Ask your sprinkler contractor and insurer.
- The floor slab. Every column load goes into the ground-floor slab. Is a slab check included, and what happens if it fails?
- Design and drawings. Structural calculations and drawings for building control, and a load notice for the finished floor.
- Delivery and installation. Included in the rate, or separate? Out-of-hours working?
For the full list of what to measure and decide before asking for quotes, see the mezzanine floors checklist.
When should a mezzanine budget include fire protection?
In England, plan to include it unless the floor meets every condition of the storage-only concession in Approved Document B paragraph 7.7, or your building control body agrees otherwise. A floor used for offices, picking by many people or the public will normally need it.
Approved Document B (Volume 2, England) says a floor or gallery is an element of structure, which normally needs fire resistance. In single-storey buildings that's needed when an element supports a gallery. Paragraphs 7.6 and 7.7 then allow raised storage floors without that fire resistance, but only if all of these are met:
- one tier, used for storage only;
- few people on it, and none of them members of the public;
- open above and below to the room it's in;
- means of escape that follow the guidance;
- no more than 10 m in width or length and no more than half the floor area of the space. With automatic fire detection and alarm on the lower level, up to 20 m; with sprinklers throughout the building, no size limit; other sizes only if agreed with building control and the fire and rescue service.
That's why the at-a-glance table has a 10 m × 10 m row without fire protection: it's the kind of floor that might qualify. A 20 m × 10 m floor would need detection or sprinklers to qualify, and those cost money too. We explain the conditions in full on our mezzanine building regulations guide. Wales, Scotland and Northern Ireland have their own guidance.
How much are building control fees for a mezzanine?
There's no fixed national fee. GOV.UK says local authority fees are based on their costs, depending on the type of work, inspections and floor area, and private registered building control approvers negotiate their fees directly. Ask for a written quote and enter it as a lump sum.
In England and Wales you can use your local council's building control service or a private registered building control approver. Each sets its own fees, so ask more than one. Things to check:
- Who applies. Some suppliers handle the application and include the fee; others leave it to you. Make sure it's in exactly one place in your budget.
- Which application. The Building Regulations require a full plans application for work in a building covered by the Fire Safety Order, which includes warehouses and other workplaces. A building notice isn't an option for those.
- Timing. GOV.UK says a full plans decision takes up to 5 weeks, or 2 months with your consent. Allow for it in the programme.
- Sign-off. You usually get a completion certificate within 8 weeks of completion if the work complies. Don't pay the final instalment until you know it's on the way.
Skipping approval isn't a saving: the building control body can require faulty work to be fixed or removed (see if you skip it). In Scotland you need a building warrant, and in Northern Ireland approval from your district council.
Why doesn't the calculator give a typical mezzanine cost per m²?
Because there's no official or reliable public source for one, and a single figure would hide what drives the price: size, load, decking, stairs, fire protection and fees. The calculator works out the cost per m² of your own budget and your own quotes instead.
Cost per m² is still the most useful way to compare quotes for the same floor, as long as you know what's in each one. Three things change it more than people expect:
- Size. A staircase, a gate, fees and design work cost much the same for a small floor as a larger one, so small floors cost more per m².
- Use and load. A floor designed for pallets and pallet trucks needs heavier steel and decking than one for light shelving. HSE's guidance says floors used with pallet trucks must be designed for wheel loads and braking as well as the stored goods.
- Usable area. Stair openings, voids and plant space reduce what you can actually use. Divide by the usable floor, as the calculator does, when comparing a mezzanine with other options.
How do I compare mezzanine floor quotes fairly?
Put every quote on the same footing: same floor size, same design load and use, and the same list of items included. Enter each line into the calculator, then compare the totals and the cost per m² of usable floor before VAT.
- Send everyone the same brief: use, design load, size, open edges, loading points and the clear height you need underneath.
- Ask for itemised quotes with quantities, and for exclusions in writing.
- Enter each quote in the calculator and save each result with its link, or enter the totals in the compare boxes. Check each is before VAT.
- Ask about safety, not just price. HSE's guidance says the finished floor should be marked with its safe load-bearing capacity and any restrictions on use. Make the load notice part of the quote.
Related guides
Mezzanine floor cost calculator: frequently asked questions
How much does a mezzanine floor cost?
It depends on the size, use, design load, decking, stairs, fire protection and fees, and there is no reliable public source for a typical price. Get itemised quotes, then use the calculator to turn them into a full budget and a cost per m² of usable floor.
Why don't you show a typical cost per m²?
We couldn't find an official or reliable public source for UK mezzanine prices, and we don't publish figures we can't check. The rates in our examples are illustrative assumptions to show the arithmetic, not market prices.
What should a mezzanine budget include besides the floor?
Staircases, pallet gates, handrail and kick plates, fire protection where needed, lighting, any sprinkler changes, design and structural calculations, building control fees, installation if it's separate, a check of the floor slab, and a contingency.
Do I need to pay building control fees for a mezzanine?
Usually. Most mezzanines in England are building work, and work in a workplace needs a full plans application. There's no fixed national fee: local authorities base fees on their costs and private approvers negotiate theirs.
Does every mezzanine need fire protection?
No. In England, Approved Document B allows a storage-only floor without fire resistance if it meets all the conditions in paragraph 7.7, including size limits. Offices, busy picking floors and floors the public use will normally need it. Confirm with your designer and building control body.
Should I add VAT to my mezzanine budget?
Add it if you want to see the full amount you'll pay. The UK standard rate is 20%. Whether your business can reclaim it depends on its VAT position, so check with your accountant.
How much contingency should I allow?
That's your decision: it depends on how complete your quotes are and how much is still unknown, such as the slab or fire protection. The calculator lets you enter any percentage and shows its effect.
What is cost per m² of usable floor?
It's the total divided by the floor area you can actually use, after taking off stair openings, voids and plant space. It's a fairer comparison than gross floor area.
Why is my small mezzanine so expensive per m²?
Stairs, gates, lighting, design and fees cost much the same whatever the floor size, so on a small floor they're spread over fewer square metres.
Is anything I enter sent to you?
No. The calculator runs in your browser. Only the enquiry form, if you choose to fill it in, sends us your details.
Sources
We checked the facts on this page against these sources on 12 November 2026:
- GOV.UK: VAT rates
- GOV.UK: Building regulations approval – how to apply, fees and costs
- The Building Regulations 2010, regulation 12 (legislation.gov.uk)
- GOV.UK: Fire safety: Approved Document B
- GOV.UK: Protection from falling, collision and impact: Approved Document K
- HSE: Warehousing and storage: a guide to health and safety (HSG76)