Planning and costs
Metal and other roof coverings: how to compare complete quotations
In brief
Compare the cost of a roof as a complete system, not the price of the covering per metre. Before you set offers side by side, establish a common roof standard: the same plan, pitches, dimensions and list of openings, plus the scope of insulation, drainage and accessories. Check whether the quotes cover the same layers and works – if one includes only the covering while the other also covers removal and the substructure, their totals are not comparable. Pay attention to the unit of measurement and how waste is calculated, because a lower price per metre does not always mean cheaper covering.
What must be the same in both quotes?
For comparison, provide the same plan view, pitches, dimensions and list of openings. Specify the scope of insulation, drainage and accessories. If one quote covers only the covering while another also includes removal and the substructure, their totals are not comparable. It is worth marking the missing items first.
Also check the standard of detail execution. How the roof valley, chimney and edges are resolved affects working time and the amount of material. Do not assume that a general note of “flashings included” means the same scope. Information is needed on which locations are covered by the quote and how any changes will be settled.
How to read the price of the steel sheet?
In the catalogue example dated 28 October 2026, a roof sheet with an 18 mm trapezoidal profile, 0.50 mm steel and a 25 µm polyester coating costs €8.41 excluding VAT or €10.34 including VAT per m² of effective cover. For the same sheet, the price per m² of overall sheet area is €8.10 excluding VAT or €9.96 including VAT. These figures cover the material alone.
The example shows the importance of the unit. Overlaps reduce the effective area, so a lower amount per full metre does not necessarily mean cheaper covering. With other profiles the difference may be different. For a specific quote, current product data must be obtained and then the actual quantity of sheets required calculated.
How to compare steel sheet with mineral tiles?
It is not enough to compare one sheet with the price of one tile. Consumption per metre, edge elements, ridge tiles and other accessories are needed. Materials also have different weights. For a renovation, check whether the existing structure suits the planned variant and what work is necessary before covering.
The low weight of steel sheet may facilitate some work, but it does not guarantee that no roof truss repairs are needed. Mineral tiles also require proper matching to pitch and structure. A full quote should include all layers and labour for both variants. A general statement that one material is always cheaper ignores these differences.
Why does an insulated panel require a separate calculation?
A sandwich roof panel consists of steel facings and an insulating core. The price of the trapezoidal sheet alone does not cover this scope. If the building is to be heated, the single-sheet variant must be supplemented with a suitable insulation and finishing build-up. The comparison is of a complete building component with specified thermal, fire and acoustic requirements.
The panel still requires supports, fasteners, seals and flashings. A long panel may require different unloading than a short metal tile-effect sheet module. The price per square metre of panel should not be treated as the price of a completed installation. The detailing of openings and junctions with the existing building is also important.
How much does roof geometry change?
A simple roof slope simplifies cutting. Roof valleys, dormers and corners increase the number of cuts and flashings. The waste percentage is not a fixed characteristic of the material itself. It depends on its format and layout on the roof. When comparing, ask for a statement of the ordered area and the effectively covered area.
Sometimes a shorter format allows better use of offcuts. In another project, long sheets will be more advantageous. The result must be confirmed by a layout plan. Similarly, the length of ridges and edges can significantly increase the cost of accessories. Two roofs with the same square metreage can therefore have different total prices.
Which costs are easily overlooked?
Check transport, unloading, scaffolding and lifting of materials. In a renovation, protection of the building, waste and repairs to the exposed structure are added. It is worth establishing how unforeseen works will be settled. A low initial price may increase if many necessary activities have been left out of the quote.
Pay attention to net and gross amounts and the applicable tax rate. The sale of material and a specific service do not have to be settled in the same way. One reduced rate must not be assumed for every roof. The quote should clearly indicate the basis of settlement and the scope to which the stated amount refers.
How can you assess a quote before ordering?
Arrange the items in order: preparation, structure, layers, covering, flashings, drainage and completion of works. Check whether each variant covers the same needs. Then compare the material parameters and warranty conditions. The length of the declared period alone does not describe the full scope of protection.
Also consider access for later inspections and the possibility of repair. It is not necessary to predict every future price in order to assess whether the detail is easy to service. A well-prepared quote allows you to decide consciously what you are paying extra for. Saving makes sense when it leaves a complete roof with the required properties.
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