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KI-Symbolbild: Ein großer, leerer Altbauraum mit Fischgrätparkett, Stuckdecke, hohen Fenstern und einer weit geöffneten Flügeltür.
Practical article Buying Austria

A large flat that is legally two units: Check the purchase of combined rooms as a single transaction

What must I clarify before purchase if the Austrian flat I viewed consists of two legally separate units.

Automatically translated – the German version is legally binding. Show original (German)

Published
19 Oct 2026
Research as of
17 Oct 2026
Applies to
Austria
For whom
Searchers & tenants
Article ID
WX26-P04-0013

You are viewing a spacious flat with a shared entrance. Two units appear in the documents. The visible floorplan and the legal scope of acquisition must therefore be checked together. A single everyday use does not automatically make several legal positions into one clarified purchase unit.

Determine the total scope offered

Our editorial recommendation: Have both unit designations, shares and the actual spatial relationship clearly assigned. Do they all belong to the same selling person? Which areas and ancillary rooms are attributed to which unit? Which components are actually intended to be included in the purchase?

The answers come from the relevant deeds and the legal review, not from your own interpretation of the doorbells. The number of kitchens or front doors alone does not determine the legal composition of the units.

Check the conversion carried out separately

§16 Absatz 4 WEG includes changes in the fabric of immediately adjoining condominium units within the amendment framework described there. [AENDERUNG] A wall opening between units is therefore not merely a question of whether the new layout is pleasing. Which consents and other legal or technical bases are decisive in the specific case must be clarified by experts.

Request any available documents concerning the executed connection and the current use. Also have it assessed whether the allocation and, where applicable, the usable area bases (Nutzwertgrundlagen) fit the actual condition. This article does not recalculate new shares and does not imply any automatic obligation to fully merge.

Hypothetical case: One part is missing in the purchase preparation

A couple receives a brochure for a large flat. However, the financing documents name only one of the two original units. The couple initially thinks the other designation is just an old number.

Before the commitment, the discrepancy is clarified with contract advice and the bank. Both should consider the same complete scope of acquisition. If in fact only one part is offered or financed, that is a different decision to the acquisition of the viewed total area. The article does not assume that a particular number in the brochure must be wrong; it requires a comprehensible link between the presentation and the planned purchase.

Do not count on a later separation as a reserve without checking

Perhaps you want to recreate two flats later or sell a part. Name this wish early as a separate project. A still existing second entrance door or an older plan does not constitute professionally verified reversibility and does not amount to a promise of later separate disposal.

For the purchase calculation you must therefore distinguish between the clarified current condition and a future design idea. An expected proceeds from a later partial disposal remain an assumption until the conditions and financing are clarified. Do not budget it as already available equity.

Create a joint final version

Before committing, check whether the contract, bank documents and your own usage planning cover the same units. Have any existing rights, encumbrances and outstanding proofs explained for both parts. A completed check of one unit should not be adopted as the completed status of the other.

The result can be a sensible overall purchase. What matters is that you recognise which legal positions you need for the visible residential combination and which questions remain open. The pleasant viewing walk is the starting point, not proof of a fully clarified overall transaction.

Sources and context

Created with the help of AI and editorially reviewed. General guidance only; not individual legal, tax or financial advice. Errors and later changes are possible.