How much does a mezzanine floor cost in the UK?

It depends almost entirely on what the quote includes, which is why published figures look like they disagree by a factor of four. For the steel structure and deck boards alone, UK suppliers publish roughly £75 to £200 per square metre, with most clustering at £100 to £150. For a floor that is fully installed, fire-protected, lit and signed off by Building Control, the published range is roughly £300 to £600 per square metre. Both are correct; they are measuring different things. An itemised 50 square metre job published by one UK installer came to £18,100 plus VAT all in, which works out at £362 per square metre, and its structure line alone was £150 per square metre. Note that only that one source states its VAT basis — the rest are silent, so treat every figure here as excluding VAT and check before you budget.

Not by default, and this is the most commonly repeated error about mezzanine floors. Approved Document B sets the unprotected limit at not more than 10 metres in width or length, for a single-tier, storage-only floor that is open above and below, used by few people and not by the public, and with compliant means of escape. The 20 metre figure is real but conditional: it applies only where the lower level has an automatic fire detection and alarm system meeting BS 5839-1. That is a fire alarm project across the building below, not a line on the mezzanine quote. Separately, if the building is fitted throughout with a sprinkler system, no size limits apply at all. If a supplier has quoted you on the basis of a 20 metre allowance without mentioning the alarm system, ask the question before you order the steel.

Roughly £40 to £75 per square metre, which is where three of the four UK sources we checked converge. Suppliers also express it as a proportion: one puts fire protection at 35 to 40 per cent of the cost of the mezzanine structure, another at 15 to 30 per cent. On the itemised 50 square metre job, fire protection — a suspended ceiling, column casings and fascia — was £3,000 plus VAT against a £7,500 structure, so about 40 per cent and £60 per square metre. The fire resistance period is usually 30 minutes minimum where the floor is no more than five metres above ground level, 60 minutes commonly specified in practice, and 90 minutes above five metres or for higher-risk uses.

Usually not. A mezzanine is internal work, and work affecting only the interior of a building is not development under section 55(2)(a) of the Town and Country Planning Act 1990. There is one statutory exception and it catches people out: where the building is used for the retail sale of goods other than hot food, adding more than 200 square metres of floorspace does require planning permission. That threshold is set by article 44 of the Town and Country Planning (Development Management Procedure) (England) Order 2015. It applies to shops and retail warehouse clubs, not to warehouses, factories or gyms. You may still need permission if the mezzanine changes the use class, involves external alterations such as new openings or an external staircase, or if the original permission attached a floorspace condition.

Real published figures, and lower than some suppliers suggest. Ashford Borough Council charges £1,298 including VAT for a full plans application on a mezzanine up to 500 square metres from April 2026. Milton Keynes charges £517.20 including VAT as the plan charge for a storage-only mezzanine up to 300 square metres, with the inspection charge determined separately. So for a floor up to 500 square metres you should budget somewhere around £520 to £1,650 including VAT depending on the authority and the scope. One widely circulated supplier figure of £1,500 to £4,000 is not supported by any council fee schedule we checked. Note that applying retrospectively costs more than applying properly: Ashford charges £1,623 for regularisation against £1,298 for approval.

Generally yes. A mezzanine is not usually treated as plant for rating purposes, but it is rateable as part of the wider hereditament — part of the premises in which the business is conducted — and the Valuation Office typically records an industrial mezzanine as a supported first floor. There is no fixed percentage in the Rating Manual; the quantum is negotiated on comparable evidence. Reported reference points include valuing the area above at half the normal ground floor rate and the area beneath at two-thirds, and instances of 60 per cent below and 40 per cent above. Supplier advice on this varies widely and some of it is wrong, so treat the rating consequence as a real cost to check with your agent rather than something that can be assumed away.

Usually not on the floor itself, and HMRC is blunt about it. The Capital Allowances Manual at CA22070 tells officers to refuse a claim for allowances on raised and mezzanine floors, because floors fall within List A at section 21 and are excluded from plant and machinery allowances. There are two narrow routes in. The first is where the platform is genuinely storage equipment under List C rather than a floor, which turns on function and completeness — used exclusively for storage, playing an active part in the trade, and separate from the building structure so it can be removed without damage. The second is where the mezzanine exists specifically to support qualifying plant. A warehouse storage platform has a credible claim; an office, retail or gym mezzanine almost certainly does not. The ancillary items such as lighting, fire alarm, sprinklers and lifts are claimable in their own right, so ask for them to be itemised separately in the quote. This is a matter for your accountant, not for us.

They are advertised in the UK from about £10 to £40 per square metre, and the comparison is not a fair one. What is being sold is dismantled components, usually collect-only, with no design, no structural calculations, no Building Control application, no fire protection and often no known load rating. Reusing a floor designed for 350 kilograms per square metre in a 720 kilogram application is a serious problem, and you will still need an engineer, an approval and an installer. It can work out cheaper for a straightforward storage platform if you go in with your eyes open, but it is not the same purchase as an installed, certified floor, and we have deliberately kept those prices out of the bands above rather than letting them drag the bottom down.

Commonly: staircases, balustrades and edge protection, pallet gates, lifts, the Building Regulations fee, delivery, plant hire, skips and waste disposal, and project management. On the itemised 50 square metre job, plant alone — a scissor lift, a forklift and a skip — was £1,500 plus VAT and the electrics were £1,800. A separate industrial staircase runs roughly £2,000 to £5,000, and you may need a second one because escape travel distances demand it rather than because you want it. If the floor will be occupied, office fit-out on top — partitions, ceiling, lighting, power — is quoted at around £33 to £55 per square metre. Ask for a quote that lists these lines rather than one headline number, which also makes the capital allowances position much easier to establish.