Sanitary Installation – Projects and Qualified Teams

Sanitary installation covers drinking-water supply, drainage, and the installation of all sanitary fixtures – the water-connected interior of every building. The trade ranges from the service connection through risers, pre-wall systems, and drinking-water distribution to the final installation of WCs, basins, baths, shower systems, and taps. Hygienic requirements, proper sound insulation, and stagnation avoidance are key quality factors. Example Germany: drinking water per DIN 1988-200/-300 and Trinkwasserverordnung (TrinkwV); domestic hot water additionally per DVGW W 551 for Legionella prevention.

FAQ

How much does sanitary installation cost per bathroom as subcontracted work?

What is a pre-wall system and when does it make sense?

Which drinking-water connections are standard?

Which drain sizes are mandatory?

Which sanitary fixtures are currently popular?

How long does a complete standard bathroom take?

How much does sanitary installation cost per bathroom as subcontracted work?: Example Germany: standard 6 m² bathroom with WC, basin, shower, bath, and pre-wall systems: 2,500–4,000 € installation only (excl. fixtures). With drinking-water and drainage rough-in: 4,500–6,500 €. In Poland costs are typically 30–40 % below German levels.
What is a pre-wall system and when does it make sense?: Pre-wall element (Geberit, TECE, Viega) hides the cistern, connections, and sound insulation behind drywall or masonry. Benefits: fast install, easy service, quiet flushing. Mandatory in modern bathrooms with wall-hung WCs. Depth from 12 cm.
Which drinking-water connections are standard?: Example Germany: manifold system (series or ring) with DVGW-certified components. Fresh-water stations recommended due to Legionella risk. No stagnant water in dead legs: DIN 1988-200 limits 'dead zones' to a maximum 0.5 l water volume.
Which drain sizes are mandatory?: Example Germany: WC DN 100, shower and bath DN 50, basin DN 40, sink DN 50. Fall 1–2 % to the stack. Main stack DN 100–150 depending on dwelling units. Venting via air-admittance valve or roof vent stack mandatory.
Which sanitary fixtures are currently popular?: Wall-hung WC with rimless ceramic, walk-in shower with tiled floor and linear drain, vessel basin on a console, concealed taps without visible connections, freestanding bath only in large bathrooms. Trend: matte-black or brass fittings.
How long does a complete standard bathroom take?: Rough-in (water, drainage, pre-wall) 2–3 days. Screed and tiling 4–6 days (separate trade). Final sanitary fit 2–3 days. Total shell-to-handover: 2–3 weeks per bathroom. Pressure test and hygienic flushing mandatory before handover.

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