What does a sandwich-panel roof cost with accessories and installation?

Not always. A sloping roof is larger than its horizontal projection. Eaves and any overlaps add to the calculation. Dormers and numerous penetrations also affect cutting. Building dimensions alone do not establish the order quantity.

Assume a 10 × 10 m plan and a 30° pitch on both slopes. Excluding eaves, their combined area is 100/cos30°, approximately 115.47 m². This is a geometric calculation for the example. The order must then be scheduled as individual panels. Cover width and lengths must suit the system, not just the total area.

Assume two panel variants, 60 and 120 mm thick. The 30° angle is used only to calculate area. Check the permitted pitch in the particular panel’s instructions. The angle alone confirms neither structural capacity nor the finished roof’s thermal performance. Both require separate checks for the building.

Use PLN 200 net/m² for the 60 mm option and PLN 270 net/m² for 120 mm. These are comparison assumptions, not selling prices or market averages. Thickness alone does not determine cost. Replace these numbers with an actual quotation when available, and check that both options have suitable facings and coatings.

At 115.47 m², PLN 200 net/m² gives PLN 23,094 net, or PLN 28,405.62 gross with an assumed 23% VAT rate. At PLN 270 net/m², the result is PLN 31,176.90 net and PLN 38,347.59 gross. This multiplies the assumed area by the example rates. An actual offer may use different amounts and billing conditions.

Waste, accessories and labour are excluded. Rounding up to whole panels and specifying actual lengths may change the quantity. The supplier confirms the final offer separately. The calculation illustrates the method, not a ready-made price for your roof. Ordering requires the actual roof layout.

Measure the ridge, eaves and side edges. Add flashings around walls, chimneys and other penetrations, then list the system’s fasteners and seals. Price flashings separately with lengths, developed widths and piece counts. The panel price does not automatically cover them.

Do not price every roof with a single percentage added to material cost. Equal roof areas can have different edge lengths and penetration counts, changing flashing quantities and labour. Installation instructions explain the function of seals and fasteners; they are not merely decorative extras.

Building height, access and element lengths matter. A simple slope needs fewer operations than a roof with numerous openings. Lifting, working platforms and site protection add costs. Structural repairs may also be necessary.

Obtain a written scope from the installer. Does it include unloading, flashings, sealed penetrations and waste removal? Is stripping the old roof included? Without these details, rates per m² are difficult to compare. Panel prices do not determine labour charges; work, equipment and access conditions need separate pricing.

When existing supports do not meet the chosen panel’s requirements, or openings and equipment are added. The designer checks loads, spacing, bearing widths and fixings. A panel reaching from one roof edge to the other does not by itself establish structural suitability.

Two roof panels may need different purlins, flashings, bearing widths or fixing quantities. Compare systems across the entire roof. A lower panel price need not mean a cheaper structure. If substitution requires more supports, include that work in the same estimate.

Send every supplier the same drawing and specification. State model, thickness, facings, coating and required performance. Define transport and installation scopes. Request separate lines for panels, accessories, equipment and labour.

Finally, check price validity and acceptance conditions. If a substitute is offered, compare its properties and structural implications. Keep the agreed scope for checking completion. Only panels, accessories, transport and labour together reveal the finished roof’s cost; the first material line is not enough.

No. They cover panels only in an explicit example, before cutting allowances and additional costs.

No. Minimum pitch and joint requirements follow the specific system’s instructions. The 30° used in the calculation is not a recommendation for every roof.