A mezzanine floor is a free-standing intermediate level – usually a bolted steel structure – installed inside a warehouse to turn unused clear height into additional floor area. It is typically the tenant’s investment rather than the landlord’s building: it creates space at a one-off cost per square metre instead of a monthly rent, carries defined loads that must be engineered rather than assumed, and raises lease questions – consent, insurance, reinstatement – that are cheapest to answer before the first column is bolted down.
What a mezzanine is – and what it is not
A warehouse mezzanine is a self-supporting platform standing on its own columns between the slab and the roof, decked for storage, picking, light production or office use. Because it is free-standing and demountable, it is usually classed as the occupier’s fit-out or equipment rather than part of the base building – the same legal family as racking, not the same as a structural concrete floor cast by the developer. That distinction drives almost everything commercial about it: who pays, who insures, whether it counts as lettable area and whether it leaves with the tenant. The engineering logic is simple arbitrage. A modern distribution box offers ten metres or more of clear height, but many activities – cartons, small parts, returns handling, offices – use barely three. An intermediate deck converts that idle vertical volume into working area without touching the building’s footprint, which is why the structure is standard equipment in e-commerce fulfilment and increasingly common in small business units where land is expensive and usable storage volume is the metric that matters.
What a mezzanine floor costs and what it carries
The two numbers that define any platform are cost per square metre and load per square metre, and they move together. European supplier Nolte Mezzanine puts light-duty structures rated up to 250 kilograms per square metre at EUR 80 to EUR 145 per square metre, heavy-duty structures rated up to 500 kilograms at EUR 145 to EUR 240, with basic installation adding EUR 20 to EUR 45 and a full setup including stairs and railings EUR 50 to EUR 75. Reinforcing the deck for moving equipment such as pallet trucks adds a further EUR 100 to EUR 200 per square metre. On the load side, UK specialist Mezz One rates 360 kilograms per square metre – roughly 3.5 kilonewtons – as sufficient for general storage with pallet racking, shelving and hand-stacked goods, moving to 500 kilograms or more where mechanical handling or dense materials are involved. Two practical corollaries follow. Small platforms cost disproportionately more – projects under 50 square metres price worse per unit than those over 100. And every step up in load rating means heavier beams and closer column spacing, so the honest brief starts with what will actually stand on the deck, not with the cheapest quote.
The arithmetic against renting more floor
Whether a platform pays is a comparison against the alternative: leasing more ground-floor space. Slovak occupiers currently pay a prime rent of EUR 5.95 per square metre per month and an average of EUR 4.55, per CBRE figures reported by Property Forum – EUR 55 to EUR 71 per square metre per year. Against an all-in build cost of roughly EUR 100 to EUR 315 per square metre for a decked, installed structure, the simple payback lands between one and a half and five years – our arithmetic, not a supplier’s brochure, and before counting the moves, double handling and second address that renting overflow space elsewhere would add. The comparison sharpens for office content: integrated office space within Slovak industrial buildings rented at EUR 9.00 to EUR 11.00 per square metre per month in mid-2025 per Industrial Research Forum data summarised by warehouserentinfo.sk, so a mezzanine office recovers its cost fastest of all. The honest caveats run the other way too: the structure is capital expenditure on a building the occupier does not own, its value at lease end may be zero or negative once removal is priced, and a short lease can bury the case entirely. The payback period only means something when it is shorter than the term that remains.
What it does to the lease
Installing an intermediate platform is an alteration, and alterations live or die by paperwork. Almost every institutional lease requires landlord consent for structural additions; the well-advised occupier asks for it in heads of terms, where consent is a negotiating chip, rather than mid-term, where it is a favour. Money follows in both directions – a landlord courting a tenant may fund part of the works through a fit-out contribution, and in return will want the platform either removed or left in place at expiry on defined terms. That exit question is the expensive one: under a standard reinstatement clause the tenant dismantles the structure and repairs the slab at its own cost, which can consume much of what the steel was worth. Ownership should be stated in words – tenant’s trade fixture, removable, financeable – because an undocumented platform has a way of becoming the landlord’s property at exactly the moment it suits the landlord. Insurance and service charge deserve a line each: the deck usually sits on the tenant’s policy, and it should not inflate the tenant’s share of building costs. None of this is exotic; all of it is cheaper to write down before installation than to argue about at dilapidations.
Design constraints that decide feasibility
Four physical checks decide whether the plan survives contact with the building. First, the slab: a platform does not spread its weight evenly but delivers it through baseplates as point loads, so the floor loading capacity of the ground slab – not the deck’s own rating – is often the binding constraint, and the developer’s slab specification is the document to read first. Second, height: two working levels with racking or conveyors need genuine clear height, net of sprinkler heads, lighting and roof structure, and the column grid determines where support posts can land without strangling truck aisles below. Third, fire: adding a level changes escape routes, may require sprinkler coverage beneath the deck and smoke detection on it, and past a size threshold the fire engineer stops being optional – in Slovakia, as elsewhere, larger installations trigger a building-authority process rather than a quiet weekend project. Fourth, operations: a platform that blocks the sprinkler scheme, shades the lighting or interrupts the racking configuration can cost more in lost efficiency below than it adds in area above. The successful projects treat the deck as part of the building’s engineering, not as furniture.
Frequently Asked Questions
Does mezzanine space count as lettable area and carry rent?
Usually not, when the tenant builds it: the lease rents the ground-floor area, and the platform is the tenant’s fixture standing inside it. But a landlord-built intermediate level offered as part of the premises can be rented – typically at a discount to ground-floor rates – so the answer sits in the lease definitions, not in custom.
What load rating does a storage deck need?
Around 360 kilograms per square metre (3.5 kilonewtons) covers general storage with shelving and hand-stacked goods, per Mezz One; pallet trucks, dense stock or equipment push the brief to 500 kilograms or more. The rating must be engineered against the specific use – and the ground slab underneath checked for the resulting point loads.
What does a warehouse platform cost per square metre?
Per Nolte Mezzanine: EUR 80 to EUR 145 for light-duty and EUR 145 to EUR 240 for heavy-duty structures, plus EUR 20 to EUR 75 installation depending on scope – so roughly EUR 100 to EUR 315 all-in before special requirements such as dynamic loads or seismic reinforcement.
Can the tenant remove the structure at lease end?
If the lease says so. A free-standing bolted platform is physically demountable and normally treated as a tenant’s fixture, but reinstatement clauses can require removal at the tenant’s cost – or, negotiated the other way, the landlord may want it left in place. Agree the exit treatment before installation.
Does adding a level need a permit?
Small platforms are often handled as fit-out, but larger installations change fire escape and structural assumptions and trigger a building-authority process – in Slovakia the threshold questions are best answered by the fire engineer and the local building office before ordering steel, because retrofitting compliance costs multiples of designing it in.