How much does a square metre of sandwich panel cost and what are you really buying?

Also check the length adopted for invoicing, the method of rounding quantities and the minimum order value. The offer may relate to whole available pieces, even though the project requires shorter sections. A clear billing unit allows the price of the product itself to be separated from the effects of its format for a specific construction project.

Record this rule next to the price in the spreadsheet, so that a later change of supplier does not unnoticedly change the basis of the calculation.

Let us assume a panel with a billing module of 1.15 m and a length of 3.2 m. Its area is 3.68 m². At an agreed net price of €34.02/m², one piece costs €125.19. Twelve such elements give 44.16 m² and €1,502.28 net. This is an arithmetic example, not a current market quotation.

If you need a section 2.9 m long, do not automatically assume that you pay only for that length. The seller must confirm the possibility of cutting and the basis of billing. The remainder has value for the construction project only when there is a use for it that complies with the design. Keeping it in storage alone does not reduce the cost of the completed partition.

Put the core type, thickness, both facings, profiling, coating and colour into one table. Add the fixing method and documented parameters. Do not compare a wall panel with a roof panel solely by thickness. The lock arrangement and the shape of the outer steel sheet result from a different mode of action and water drainage.

The name of the core is not sufficient to assess load-bearing capacity or fire classification. The U-value for a given panel is not the lambda of its insulation material. If the cheaper item has a different specification, the designer should check whether it can be used. The saving exists only with a solution that meets the requirements of the building and its location.

Let us assume two possible cutting layouts for the same finished surface of 160 m². Variant A requires purchasing 180 m² at an agreed €32.17, that is €5,790.60. Variant B needs 168 m² at €34.95, that is €5,871.60. At the material stage alone, the difference is only €81.00, despite a clearly different unit price.

If the additional cutting and details cost the assumed €312.46 in A and €106.47 in B, the totals rise to €6,103.06 and €5,978.07. In this model, B is cheaper by €124.99. All amounts are net assumptions. Other identical costs have been omitted; in a real comparison, both the quantities and the full scope must be confirmed.

Flashings, fasteners, sealants, transport, unloading and installation may occur separately. Accessories are billed in various units: linear metres, pieces or packs. Their rates must not be added together as if each meant złoty per square metre. First calculate the required quantities and the value of each item.

In a small order, the organisation cost can be significant per metre. The building height, the length of the elements and access to the workplace, on the other hand, affect the equipment. Compare two separate totals: the purchase of the panels and the execution of the agreed cladding. This makes it clear what the choice of material changes and what results from the site conditions.

Give all bidders an identical list of dimensions, the number of pieces and the technical requirements. Ask them to state the unit, the net or gross price and any exclusions. If the batch has a reduced commercial grade, describe the permitted defects and the elements intended for rejection. A cheap metre of panel that is unusable in the project still burdens the budget.

The deadline and the validity of the quote should be unambiguous. If the colour, claddings or lengths change, update the calculation instead of carrying over the old rate. Base the final choice on the same finished area and specification, and keep the material price per metre alongside. Both indicators answer different investor questions.