How much does a bathroom with 120 × 280 cm slabs cost?

1. Material — what do the slabs themselves cost?

The lowest-priced large formats start at around PLN 400/m², usually on promotion. Realistic prices for 120 × 280 cm porcelain or sintered-stone slabs are: large-format porcelain from PLN 400/m², mid-range sintered stone from PLN 450/m², and premium sintered stone with precise pattern matching from PLN 550/m².

Waste is calculated differently for a 120 × 280 cm format than for standard tiles. You cannot buy half a slab. Cuts and the risk of damage during transport or installation mean that a carefully planned allowance is necessary — often an additional full slab.

2. Labour — installation rates for large format

Large-format work in a bathroom begins at 120 × 120 cm. With 120 × 280 cm slabs and sintered stone, rates are substantially higher. Installation labour starts at PLN 450/m²: from PLN 450/m² for straightforward walls, from PLN 480/m² for walls, floor and a walk-in shower, and from PLN 520/m² for precise pattern matching. Mitred 45° corners start from PLN 200 per linear metre, while openings for sockets, mixers and drains start from PLN 100 each.

At this format, work is carried out by at least two people. Vacuum lifters, levelling systems and suitable logistics are required. One-person installation creates too much risk of material damage and geometry errors.

3. Additional costs that make up a realistic quote

Tile installation is only part of the total. Substrate levelling starts from PLN 50/m², self-levelling screed from PLN 55/m² and professional under-tile waterproofing in wet zones from PLN 60/m².

Decoupling mats cost about PLN 90/m² for the material and from PLN 150/m² installed. They are especially important with underfloor heating and large formats, where they help reduce the risk of cracks after the first heating season.

Allow from PLN 35/m² for a suitably flexible adhesive, from PLN 30/m² for epoxy or highly flexible grout and from PLN 20/m² for the levelling system. Screws, sealants, silicones, mortars, tapes, profiles and waterproofing collars also add a real cost — from hundreds to several thousand zlotys depending on the scope and standard.

Logistics cover slab transport, protective crates, carrying the slabs upstairs and sometimes a lift or additional equipment. For 120 × 280 cm slabs this can cost from several hundred to several thousand zlotys, depending on access and location.

4. Example real costs for a bathroom

For 120 × 280 cm slabs, standard price lists starting at PLN 200–300/m² are not realistic for a bathroom project. For a typical 5–7 m² bathroom, measured as walls plus floor, with a walk-in shower and 120 × 280 cm slabs, a realistic budget for the finishes alone starts at about PLN 30,000–38,000. That includes material, labour, substrate preparation, waterproofing, mats, adhesive materials and minor supplies.

The final figure increases with the material selected, number of cuts, access conditions, complex geometry, number of openings, pattern matching and mitred corners.

5. What determines the final price?

The decisive factors are the actual substrate condition, underfloor heating, the number of corners, recesses and openings, access by lift, stairs or hoist, mitred rather than profiled corners, the team’s experience with 120 × 280 cm slabs, adhesive class and the quantity of small sealing materials.

The cheapest quote is rarely the least expensive at completion. With large formats, mistakes are costly — both in material and in later remedial work.

Summary

Slabs of 120 × 280 cm create an effect that smaller formats cannot achieve. They also demand precision, the right equipment, experience and a complete allowance for system costs such as waterproofing, decoupling mats, suitable adhesives and numerous minor materials.

In Kraków in 2026, labour from PLN 450/m² for 120 × 280 cm sintered stone and material from PLN 400/m² are realistic starting points. Contact us for an individual quote for your project.