First translate your housing wish
Note what the building should provide: for example two separately usable flats, a ground-level entrance, space for bicycles or a study with visitor traffic. Add wishes that would change the building massing, such as an additional storey or a large garage. A rough sketch may look unprofessional. It must make clear which use and which scale should be examined.
Our editorial recommendation: separate indispensable requirements from negotiable wishes. “Sleeping room reachable without steps” is more precise than “barrier-free dream home” (barrierefreies Traumhaus). If the municipality asks for dimensions, wishful images alone will not suffice. Therefore have a suitable planning professional think along early on, without already commissioning a finished submission plan.
Which plans answer which question?
Official guidance distinguishes between land-use zoning (Flächenwidmung) and development/building regulations (Bebauungsbestimmungen). The relevant plans can be inspected at the municipality; in Vienna the federal information names MA 21. This source also recommends asking about planned changes before purchase. [Q1]
Ask for the plan version applicable to the specific plot including legend and supplementary provisions. Don’t only ask “Is building allowed there?”, but for example: What framework conditions apply to our proposed building mass? Are there special stipulations or ongoing procedures? Which authority assesses the actual submission? Spatial planning and building law are regionally specific; information from another federal state will not answer your local question.
The plot must also function practically
Technical pre-checks include location, terrain, accessibility and connections. The official page on plot characteristics points in particular to the importance of hillside location, access road provision (Aufschließungsstraße) and soil composition as well as to expert clarification if there are doubts. [Q2]
Create your own list of questions for this: Will a construction crane fit on the plot? Where will excavation and materials be stored? What impact would a basement have on the planning? Where might services run? These are tasks for checking, not already established problems. Adjacent development can provide clues, but does not replace planning or an investigation of your plot.
Example: A level house on a narrow sloping plot
A couple want sleeping, bath and kitchen on one level. The inspected plot appears large enough, but is narrow and falls away towards the road. The decisive question is therefore not only whether the desired living area fits numerically. It must be clarified whether the suitable building area and the access are compatible under local requirements. Our recommendation: first a simple feasibility study with position and heights, then clarify the open points together with the responsible authority. Only after that can the purchase decision be sensibly developed further.
How to turn the appointment into a reliable working basis
Take the plot number, site plan, your usage description and the rough sketch with you. After the meeting note which statements were only general orientation and which documents are still missing. Assign a responsible person to each open question. An unanswered question remains explicitly open; it is not automatically resolved with “it will probably be fine”.
Also keep the respective plan version and the date of the information. If the draft is later changed, the assumptions affected must be re-examined. An additional storey or a different access is not a mere editorial change to your file.
Limits and next step
This preparation does not replace a building permit, soil investigation or contract review. No zoning alone constitutes a guarantee for a specific project. Have unresolved risks professionally and legally assessed before a binding purchase offer. The sensible next result is a short feasibility decision with comprehensible assumptions, not a hastily perfected house image.