A plot on the edge of a forest or a house to rebuild in a green neighbourhood is often the beginning of the most rewarding projects. Before you sign, however, one thing needs to be established: what may be built on the property, and on what scale. The answer is given by the local development plan or - where there is none - by a zoning decision.

Local development plan or zoning decision

Where a local development plan (miejscowy plan zagospodarowania przestrzennego) is in force, it determines the purpose of the plot and the building parameters. The plan is a local law - you can consult it at the municipal office and usually on the municipality’s website.

Where there is no plan, the building conditions are set by a zoning decision (decyzja o warunkach zabudowy, known in Polish as “WZ”). It is issued on application by the head of the municipality, the mayor or the city president - and importantly, anyone can apply, not only the owner of the plot. This means a buyer can check the building potential before the purchase - provided the municipality can issue such a decision at present (see below).

What the decision sets out

The decision specifies, among other things, the type of development (for example a single-family house), the building line, the permitted built-up area, the width of the front façade, the height of the building and the shape and pitch of the roof. These parameters follow from an analysis of the surroundings - new buildings are meant to match the existing ones.

The good-neighbour rule

A decision can only be obtained when the statutory conditions are met. Above all, at least one neighbouring plot accessible from the same public road must be built up in a way the new building can follow. The land must also have access to a public road and sufficient utilities, existing or planned. That is why obtaining a decision for a plot in open fields, far from other buildings, can be difficult or impossible.

The planning reform

A reform adopted in 2023 introduced general municipal plans and changed the rules significantly. Since 1 September 2026, a zoning decision on a new application can only be obtained in a municipality where a general plan is already in force - and only for land the plan designates for infill development. In municipalities that have not yet adopted a general plan, only applications filed before that date are processed. Decisions that became final before 2026 remain valid indefinitely, while newer ones generally expire after five years.

What else to check

  • Heritage protection - whether the plot or building is listed in the register or the municipal record of historic monuments, or lies within a protection zone.
  • Nature protection and special zones - landscape parks, Natura 2000 areas and, in Konstancin-Jeziorna, spa protection zones.
  • Trees - felling may require a permit, and mature trees affect where the house can stand.
  • Access and utilities - whether the plot has direct access to a public road or relies on an easement, and the terms for connecting electricity, water, sewage and gas.
  • Land and mortgage register - the owner, encumbrances, easements and any claims.
  • An existing decision - if a zoning decision has already been issued for the plot, it can be transferred to the buyer with the consent of the person it was issued to.
  • Ground conditions - if in doubt, a geotechnical survey will show how to found the building safely.

Buying on condition

If there is no zoning decision yet but the plot meets all your other expectations, you can sign a preliminary agreement that makes the sale conditional on obtaining a decision with specified parameters. In a municipality without a general plan, such a condition cannot be met at present - the basis should then be a local development plan or an existing, valid decision. This protects both sides: the buyer does not risk buying a plot on which the planned house cannot be built, and the seller knows the transaction has a real basis.

A well-informed decision

With houses and plots in Konstancin, Wilanów or on the outskirts of Mokotów, the legal details matter a great deal. We help you check them before you decide. See our houses for sale or get in touch.

This article is for information only and does not replace legal advice or consultation with an architect.