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How much does 1 m² of trapezoidal sheet cost? Reading a price list correctly

Metal roofing

At a glance

The price of a square metre of trapezoidal steel sheet depends on its profile, thickness and coating, but also on the area used for billing. A worked example may show PLN 35 net per total square metre and approximately PLN 36.34 per square metre of effective cover for the same sheet. The overlap explains the difference; the material itself has not become more expensive. The figures below are illustrative Polish-currency calculations, not current offers. To compare quotations, establish the unit and tax basis first, then check the exact specification, accessories, cutting requirements and delivered total for your roof.

Trapezoidal sheet sample on a desk for preparing a quotation

A lower figure may simply use a different unit

In this example, the sheet has a total width of 1142 mm and a cover width of 1100 mm. Part of its area forms the overlap. The total-area rate is therefore lower than the effective-area rate. Comparing these figures without labels creates a misleading difference. Conversion requires both dimensions for the exact sheet variant.

Read the column heading first, then check whether the price is net or gross. Only then compare products. Do not switch between total and effective rates for the same model according to whichever gives the lower figure. The whole estimate needs a consistent basis.

Illustrative prices per effective square metre

The following four rates are assumptions for a worked calculation. They compare sheets with a 25 µm polyester coating and cover material only, excluding installation. The gross column assumes 23% VAT. This demonstrates the calculation method; it is neither a sales offer nor a claim to the market’s lowest price.

Example variants for comparing costs

Model	Thickness	Net/m² cover	Gross/m² cover
T18	0.50 mm	PLN 36.34	PLN 44.70
T18	0.60 mm	PLN 46.72	PLN 57.47
T18	0.70 mm	PLN 57.10	PLN 70.23
T35	0.50 mm	PLN 39.73	PLN 48.87

This is not a ranking of the cheapest shops. It excludes discounts, availability and transport costs, and does not establish which model suits the building. Similar prices do not imply equal load capacity or cover width. Check those characteristics in the documentation.

Nor is the 0.70 mm option automatically better. Structural requirements may call for it, but the selection should follow a calculation. Extra thickness cannot correct faulty fastening or an unsuitable roof pitch.

Coatings and extras change the specification

Changing the coating changes the quotation. For 0.50 mm T18, assume PLN 41.53 net/m² of cover with 35 µm matt polyester and PLN 57.10 with 55 µm polyurethane. Assume PLN 43.60 for 25 µm polyester with anti-condensation fleece. These different packages cannot be reduced to one “T18 price”.

Include coating type and thickness in the comparison. Also specify the decorative side, protective film and any fleece. A surcharge may be charged per square metre or linear metre. Cover width is needed to compare it with another offer. Check that the base price does not already include the extra.

For a small number of sheets, check minimum delivery quantities too. A unit-price table may not show every delivery condition. Find out whether collection changes the cost and how the sheets will be packed. Damage during your own transport is not a saving.

Why a finished roof costs more per square metre

Sheets must fit the roof slopes. Valleys and angled edges produce offcuts, while end joints require overlaps. Flashings, screws, seals and transport add further costs. A square metre of sheet listed in a catalogue does not include these items.

Delivery can substantially raise the cost per metre on a small order. For a large order, unloading and safe storage become important. Obtain a final price for the actual sheet schedule. It is a sounder basis for a decision than a screenshot of one price-list cell.

If two offers have identical specifications, compare the final order values. Minor rounding of unit prices may produce slightly different results when multiplied. The binding calculation should be clear in the confirmed quotation.

A lower price must concern comparable material

Check manufacturer, model, thickness and coating, and confirm whether the sheet is for roofing or cladding. Second-grade stock needs a description of the batch and its deviations. The price of a new product meeting its specification is not directly comparable with a damaged or unidentified sheet.

Support calculations use data for the specific profile. Load tables distinguish structural arrangements and capacity criteria. Do not substitute material after receiving a cheaper offer without checking the design. A few złoty saved may be illusory if additional supporting members are needed.

Obtain a dated quotation with clear conditions

Record price validity, intended delivery and the unloading scope. Material rates can change; final conditions follow the confirmed order. If several weeks pass before purchase, check that the quotation remains valid. Even a small unit-price change affects a large roof budget.

Finally, check the installation instructions and complete accessory list. The right sheet still needs correct fastening. A purchase is not fully planned if the estimate includes only the sheeting. A complete quotation makes the roof cost calculable without guessing at missing parts.