How do you check the cost of a 40 mm wall panel quoted only per square metre?

The 40 mm dimension does not identify PIR, PUR or another core, or the thickness of either steel facing. Thin panels can differ in intended use and documentation. Identify the product and, where relevant, why it was downgraded before calculating the price.

If the offer is for a pack, ask whether it can be split. Having to take surplus pieces changes the total even when the rate stays the same.

For example, 18 panels each 3.2 m long with a cover width of 1 m give 57.6 m². At an illustrative rate of about €22.25/m² excluding VAT, the panels come to €1,281.34 excluding VAT, converted before rounding. This is an arithmetic example, not a market offer.

If another system covers 1.1 m per panel, redo the layout rather than keeping the piece count unchanged. The last strip may be wider or narrower. The pack price need not equal the net wall area multiplied by the rate. The piece schedule turns that estimate into an order.

In the same example, allow €190.01 excluding VAT for flashings and installation materials and €148.30 for delivery. The total becomes €1,619.65 excluding VAT, or €1,992.17 including an assumed 23% VAT. Labour and any unloading are still separate.

For 52 m² of finished wall, those three items cost about €31.15 per installed square metre excluding VAT, above the €22.25 material rate. This is not a pricing error. It reflects the purchased quantity and scope; compare complete baskets on the same assumptions.

Identify the wall requirements first. An internal partition, cladding for an unheated building and the outside wall of a heated workshop have different jobs. Assess capacity, fire and moisture as well as insulation. A low price proves none of those requirements are met.

Check the product U-value and planned joints. A thin panel does not by itself prevent condensation. Adding insulation later also requires assessment of the entire build-up. Include a planned change of use in the purchase decision.

Compare the confirmed properties with the requirements for both facing thicknesses, coating, colour, cover width and joint. Check available quantity. A low price for the last few pieces says nothing about the cost of completing the wall.

For second-grade stock, obtain the list of deviations; for custom production, confirm lead time and minimum batch. In both cases establish documentation and responsibility for delivery condition. A verified complete lot cannot be compared with an unspecified starting price.

Improve the cutting plan and ordering sequence first. Coordinate lengths, openings and reuse of short sections to reduce waste. Ask whether flashings and panels can travel together. Saving a trip may be easier than changing the wall specification.

Do not omit specified fasteners or seals or change a facing without assessing the effects. After revising the schedule, request a new total on the same unit and scope. Control the bill by matching the purchase to the design.