How much does fire protection of steel structures cost: what makes up the price

“How much does it cost to coat steel with fire protection?” is the first question in almost every enquiry. And there is no honest one-number answer to it. Not because the contractor is hiding something, but because fire protection is not paint in a tin — it is a calculated system: the very same structure can be cheap or three times more expensive, and both answers can be correct. Let us go through what the price is actually made of, so that you can read estimates and compare offers with your eyes open.

Why a “price per square metre” on its own tells you nothing

When a quotation contains a single line saying “fire protection — so much per m²”, that is not a price but an invitation to a misunderstanding. The number hides the thing that matters most: the thickness of the coating. And thickness is not a matter of taste — it is calculated for a specific fire-resistance limit and a specific structure.

The consequence is simple: an offer that looks a quarter cheaper may mean a thinner layer has been assumed. Such a site will be coated faster and cheaper, and at handover it will turn out that the actual limit is below the design value. Redoing the work costs more than doing it properly in the first place: the old coating has to be removed.

What actually drives the cost

• The required fire-resistance limit. The dominant factor. Moving from R30 to R90 multiplies the calculated thickness several times over, and with it the material consumption — the most expensive part of the estimate.
• How massive the structure is. A thin-walled profile heats up faster than a heavy column, so for the same required R the thinner steel needs a thicker coating. An angle-section truss and a heavy I-beam column in the same building will cost differently per square metre of surface.
• The surface area of the steel. It is counted neither by floor area nor by the weight of the structures “roughly”, but by the actual developed surface. That is painstaking work from the specifications, and it is exactly what makes an estimate honest.
• The condition of the steel and its preparation. Fire protection goes onto a prepared substrate. If there is rust, mill scale or flaking shop primer on the structures, abrasive blast cleaning or primer repair will be needed — a separate cost item that cannot be skipped.
• Working conditions. Height, confined space, work on a live production site, night shifts, the need for scaffolding or lifts — all of this affects labour far more than people tend to assume.
• Volume. Economies of scale are real: on a large site the price per square metre is lower than on a few columns in a basement.

What goes into the estimate besides the paint itself

A complete fire-protection system almost always consists of three layers, and each of them costs money. At the bottom the primer (or repair of the shop primer), in the middle the intumescent coating itself, on top the topcoat. The last one is not there for looks: intumescent materials are sensitive to moisture, and outdoors or in a damp workshop a coating without a topcoat will not last its intended life. On sites with an architectural design the topcoat also sets the colour.

The second item, usually remembered last, is inspection and paperwork: coating thickness measurements, as-built documentation, hidden-works certificates, product certificates and test reports for the declared limit. Without that package the site cannot be handed over, and reconstructing it after the fact is painful.

How to compare offers

1. Insist that the offer states the calculated R limit and the coating thickness for each type of structure. Without those two numbers there is nothing to compare.
2. Check whether surface preparation has been costed. Its absence from the estimate is not a saving but a deferred bill.
3. Clarify whether the topcoat and the documentation are included. A cheap offer is often simply an incomplete scope.
4. Ask for the test report for the specific product. A certificate confirms that the declared limit is achievable, but only at the calculated thickness.

What is needed to price your particular job

To give a real figure rather than an average, four things are enough: the required fire-resistance limit from the design, the steel specification or drawings, the service conditions (indoors, outdoors, damp or aggressive environment) and an understanding of the surface condition at the start of the work. From that, thickness, consumption and labour are calculated — and you get an estimate that can be defended in front of both the client and the inspector.

STATERM selects fire-retardant paints from the TERM-007 and TERM-009 range for the required limit, calculates the thickness for your structure and carries out the fire protection treatment with thickness control and a full set of documents. Send us the design — we will price it and explain every line.

Call us: +998 90 918 81 88.