Building handbook
The Izoprofil.eu handbook covers roofing, wall cladding and insulation, from reading specifications to preparing an order. Find guidance on sandwich panels, PIR boards, trapezoidal sheets and metal roof tiles. Understand overall sheet width and effective cover width, compare insulation options and plan installation details. The articles also cover renovation, material storage and costs that are easy to overlook. Worked examples explain the calculation method. Check the design and product documentation before making the final selection. Once you have identified the material, prepare the dimensions, quantity and delivery location for a quote.
Unauthorised construction in Poland: what happens and how can it be put right?
Unauthorised construction can result in works being halted and proceedings before the building supervision authority, and not every irregularity follows the same removal procedure. Before taking any steps, compare the actual structure with the documentation you hold: check the permit, notification, design and subsequent changes. Establish the scope of the breach and the date the works were completed, as these determine the correct procedure. Remember that the absence of a document from your home file does not prove it was never issued – the records may be held at the office. This determination can matter more than preparing a new cost estimate. This guide describes Polish law as at 1 November 2026.
What changed in Polish building law in 2026?
In 2026 the scope of building simplifications and supervision procedures changed, but this does not mean freedom to build without a design. Investors should first check whether the planned works qualify for a specific exemption and what conditions must be met. It is essential to identify the correct provision and its commencement date, because some changes from the act adopted at the end of 2025 have applied since 7 January 2026, while other regulations have separate dates, including 20 September 2026. Decisions should not be based on the headline 'new building law' alone. This guide describes Polish law as at 1 November 2026.
Polish VAT on roofing materials and roof renovation work
In Poland, if you buy roof sheets or insulation as materials, the seller will generally charge 23% VAT. A roof renovation may be treated differently when the contractor takes responsibility for both the materials and the work. To establish whether the 8% rate applies, check the type of building, its usable floor area and exactly what the contractor has agreed to deliver. Compare the final VAT-inclusive totals and the work included in each quotation. The Polish rules discussed here were checked on 1 November 2026.
How to draw up a roof budget that covers the whole job
The cost of a roof is best calculated in separate parts rather than by multiplying the covering price by the floor area of the house. To obtain a reliable estimate, you should prepare a plan of the roof slopes with dimensions and pitch angles, and for a renovation take into account the actual shape of the structure. In the material cost estimate, it is worth separating the covering area from the area of purchased sheet metal, because waste depends on the layout of the slopes and the length of the sheets. The final result is also shaped by flashings, insulation, access to the building and the scope of work. When comparing quotes, check whether they cover the same scope and unit of measurement.
T35 trapezoidal steel sheets: where they work well and what affects the price
T35 is a family of trapezoidal sheets with a high profile, intended for appropriately designed roofs and claddings. Rather than relying on the name alone, check the cross-section drawing, steel thickness, geometry and support spacing, because load-bearing capacity depends on these parameters, not on profile height alone. Also establish whether you are choosing a roof or wall version, and compare the effective width and the method of calculating area. Price depends on thickness, coating and order configuration, so the choice should follow the building's requirements, not merely a comparison with a lower trapezoidal sheet.
What affects the price of T18 and T35 trapezoidal steel sheets?
The price of T18 and T35 trapezoidal sheet depends mainly on thickness, coating and the unit of settlement, so offers should be compared at the same specification. Before choosing, check whether the price refers to the usable or total metre, as well as the sheet width and type of protection. The profile designation alone does not describe the whole product. Add flashings, fixings, delivery and installation to the budget. Record the parameters of both proposals in one table to assess the actual quantity of material and the price difference.