Building Zone, Density, Heritage Protection: What You Must Know Before Buying

Before you buy: check the building zone, density and protective measures.

Understanding the building zone

The building zone determines what may be built: residential zone (W2, W3), mixed-use zone, commercial zone, core zone. Depending on the zone, different regulations apply to the number of storeys, ridge height and setback distances.

Plot ratio / floor space index

The plot ratio (AZ) or floor space index (GFZ) determines how much floor area may be built. Example: AZ 0.5 on an 800m2 plot = max. 400m2 of floor area.

Heritage protection

Listed properties are subject to restrictions on conversion and renovation. Advantage: often tax relief for renovation costs. Disadvantage: every alteration must be approved.

Checklist before buying

1. Inspect the zoning plan at the building authority
2. Check the plot ratio (potential?)
3. Check the heritage protection register
4. Request the building permit history
5. Research neighbouring projects

As of April 2026. All information without obligation.