Wydaje mi się, że to po prostu slangowe określenie na skrót wzz (warunki zabudowy i zagospodarowania).

Ewentualnie pominąć z tłumaczenia.

In areas not covered by the local plan, its function is taken over by planning decisions (literally, “decisions on development conditions”)
The planning decision document (abbreviated as “WZ” and commonly referred to as “wuzetka”) is an administrative act (taking the form of an administrative decision), which formulates principles regarding the manner of construction and land development. The planning decision in its initial assumption was to perform an auxiliary function, and it was meant to support the planning and investment process. However, in fact it has become the basic instrument of local planning, applied by local government units.

- https://gll.urk.edu.pl/zasoby/74/GLL-4-4-2018.pdf = pages 1 and 2

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An outline planning decision (the “WZ decision”) is a key element of any construction project carried out in an area which is not covered by a local spatial development plan.

- https://www.millercanfield.com/resources-POLAND-Outline-Plan...

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♦ issuing decisions on land development (“WZ Decision“) is to be limited;
♦ validity period of the WZ Decisions is to be introduced;
♦ the possibility to apply Housing Investments Special Act also to certain non-residential (e.g. to industrial) investments to be introduced;
♦ rules of developing the investments based on the Housing Investments Special Act are to be substantially amended, in particular by introducing the so-called integrated investment plans, that are to be a type of local zoning plans (“LZP“). An integrated investment plan will have to be preceded by the conclusion of a so-called urban planning agreement between the investor and the municipality.

Issuing of WZ Decisions to be limited
One of the key changes that the Draft includes is the replacement of the Studies with new planning acts, namely with general plans. General plans, as opposed to Studies, will constitute a local law act and so will be binding within issuing the WZ Decisions. Such approach will significantly limit the possibilities of developing the areas that not covered by LZP. Under current legislation, the provisions of the Studies are not binding for the authorities issuing the WZ Decisions, and therefore their unfavourable provisions are not a legal obstacle to issuing favorable WZ Decisions.

- https://skslegal.pl/en/legal-alert-spatial-planning-the-gove...