Screed = concrete floor (handover of the apartment from the developer)
Screed - what is the standard?(handover of the apartment from the developer)
Concrete floors, known as screed, which is the "floor" we will find in our newly purchased apartment, are accepted according to the standard PN-B-10144:1962 - Concrete and cement mortar floors -- Requirements and technical tests upon handover.
Screed - how to measure the flatness of the concrete floor?

We check with a 2m long batten – for example, like the one in photo no. 1,

we place it at any location and direction on the substrate and...

we check the width of the gap between the batten and the concrete.

The maximum gap size according to the standard is 5mm. Anything exceeding this can confidently be noted as a defect that needs to be corrected.

A wedge gauge can be helpful; if we don't have one, we can also use a tape measure or even a ruler.
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Additional requirements for the concrete floor (screed)
Additionally, the floor:

should be clean

cracks and defects are unacceptable

should have perimeter expansion joints (separation, usually special foam – no. 3 in the photo, from the walls)

should have shrinkage joints (special cuts in the screed, distinguishable from cracks by being even – no. 4 in the photo)
Most common execution errors of the concrete floor (screed)

deviations from the plane

unevenness in the corners of the rooms

local defects

dirt

cracks

sagging of the floor
Most common errors when checking the concrete floor (screed)
We do not press the batten against one end to show a greater deviation – the batten should rest freely on the floor (it happens that even some inspectors checked the floor this way during the apartment handover...

)
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