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Auctioning a co-ownership share: what bidders check on share, use and partition

How a bid on an ideal co-ownership share differs from a partition auction under section 352a EO and which use and administration questions belong to the review.

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BRANDAUER Rechtsanwälte

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We review the court file and property documents, explain the likely legal and financial consequences, and agree the next step with you.

1 August 2026, Mag. Bernhard Brandauer, Rechtsanwalt

When only an ideal co-ownership share is auctioned, the buyer does not acquire any physical part of the property. The buyer joins an existing community and takes over a legal position shaped by the other co-owners, the current administration and the actual use of the property. For a bidder this changes the valuation of the object fundamentally.

Equally important is the sharp line between an auction of an individual share and a partition auction. The share auction under sections 133 et seq EO serves to satisfy a specific creditor from the assets of a specific co-owner. The partition auction under sections 352 and 352a EO serves the dissolution of the community and follows its own scheme, in particular for the minimum bid.

Co-ownership share check

Which steps are still open before bidding for an ideal share?

Answer for the specific community. The result separates acquisition type, use and partition perspective.

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01 Question 1

What type of auction is this?

All paths at a glance

Overview of all outcomes.

01

Partition auction with its own minimum

A partition auction places the entire property into liquidation. Section 352a EO uses the appraised value as the starting point for the minimum bid, subject to a deviating agreement under the statutory mechanism. Co-owners are paid pro rata from the proceeds.

Review the edict and conditions →
02

Match the edict against the type of proceeding

Check the label of the share, the identification of the community and the reference to the underlying enforcement title. Without a clean categorisation, valuation, use and partition perspective cannot be separated.

Request classification of the proceeding →
03

Assess binding effect of the use arrangement separately

Under section 828(2) ABGB a use arrangement binds successors only where it is annotated in the land register. Without such annotation the binding effect on the buyer needs to be examined case by case; mere factual practice is generally not sufficient.

Check land register and annotation →
04

Clarify the use situation before the hearing

Without a documented use arrangement the economic value of the share is uncertain. Use, cost sharing and possible tenancy positions should be documented before bidding.

Review viewing and use conditions →
05

Frame the partition strategy carefully

Section 830 ABGB provides the objections of untimely partition and of detriment to the other co-owners; immediate enforceability is therefore not guaranteed. Section 843 ABGB triggers the judicial sale where physical division is not feasible or would cause a substantial loss.

Include partition scenarios in the budget →
06

Bid with a clear co-ownership goal

Anyone intending to remain in the community should know the ordinary administration by majority by shares under section 833 ABGB and the role of sections 834 and 835 ABGB for important changes. For valuation, share size, use arrangement and building condition are all relevant.

Buyer checklist for the share →

What an ideal share actually represents

Section 825 ABGB defines co-ownership as divided ownership in the same object. Legally the co-owners do not hold any physical part of the property but an ideal fraction. Only the actual use and any arrangements assign specific spaces to specific co-owners.

Section 828 ABGB covers dispositions over the ideal share and the binding effect of use arrangements. Each co-owner can freely dispose of the ideal share; this makes the share an independent asset that is also subject to enforcement. Section 828(2) ABGB requires an annotation in the land register for a use arrangement to bind successors.

For a bidder this means that no specific apartment and no specific room is acquired but a fraction of the legal whole. What that fraction is worth in economic terms depends heavily on the use arrangement and on the willingness of the other co-owners to cooperate.

Two different enforcement paths

The enforcement auction against a co-ownership share serves to satisfy a specific creditor out of the assets of one co-owner. Only that share is auctioned; the other co-owners remain in place with their fractions. The proceeding follows sections 133 et seq EO with the corresponding rules on the minimum bid.

The partition auction is ordered on the basis of section 843 ABGB where physical division cannot occur or would cause a substantial loss. Section 352 EO governs the enforcement to dissolve the community; section 352a EO sets the appraised value as the starting point for the minimum bid, subject to a deviating agreement under the statutory mechanism.

For bidders, creditors and co-owners the label of the edict is therefore the first review point. Without a clean categorisation the economic and legal framework of the bidding cannot be understood.

Two routes

Share auction and partition auction compared

The overview shows the key differences from the bidder and co-owner perspective.

Comparison of the acquisition position
Review point Share auction Partition auction
Object of sale Ideal share of one co-owner The whole property
Basis of the proceeding Enforcement title against a single co-owner under sections 133 et seq EO Partition claim under section 830 ABGB combined with section 352 EO
Minimum bid Rules of the share auction under sections 133 et seq EO Appraised value as starting point under section 352a EO, subject to agreement
Buyer outcome Joins the existing community Sole ownership after the award
Other co-owners Stay in place with their shares Paid pro rata from the proceeds
Valuation focus Share size, use arrangement, blocking risks Total value of the property from the court valuation

A bid without clarity on the type of proceeding meets different rules on ranking, assumption of encumbrances and minimum bid.

Use arrangement: written, factual or annotated

A use arrangement assigns specific rooms or spaces to specific co-owners. For binding effect on successors under section 828(2) ABGB the annotation in the land register is decisive. A mere written or factual arrangement does not simply bind the buyer.

Without annotation, whether and to what extent the buyer is bound must be examined case by case. Factual practice and long-standing tolerance do not create the land register protection; they may nevertheless generate expectations that need to be sorted out legally in the ongoing operation.

For valuation of a share, bidders should therefore ask for the annotation status, the written arrangements and the practice of recent years. Without annotation the value of the use arrangement is less predictable for the buyer.

Administration: ordinary and important matters

Section 833 ABGB assigns ordinary administration to the majority of the co-owners by shares. For the buyer this means that they can be outvoted with their share in the ordinary operation of the community but also participate in decisions.

Section 834 ABGB governs important changes. They generally require the consent of all and under narrow conditions open the path to a judicial substitute decision. Section 835 ABGB governs extraordinary security for substantial changes.

The share size relative to the other co-owners is therefore central to the valuation of the acquisition. A minority position without structural leverage is economically different from a majority or blocking share.

The partition claim under section 830 ABGB

Section 830 ABGB grants every co-owner the claim to dissolve the community. The claim is not unlimited, however; the other co-owners can raise the objections of untimely partition and of detriment.

Where physical partition under section 843 ABGB is not feasible or would cause a substantial loss, the judicial sale is ordered. Procedurally the partition is executed as enforcement to dissolve the community under section 352 EO; section 352a EO contains the separate rule on the minimum bid.

A buyer who plans to dissolve the community should assess this perspective before bidding. Timing, costs, procedural risks and the possible reactions of the other co-owners have a direct impact on the economic value of the share.

Review steps

From bidding interest to a considered share acquisition

The sequence separates legal position, use and partition outlook.

  1. 01
    Object

    Identify share and community

    Land register entry, share size and other co-owners are allocated.

  2. 02
    Use

    Review arrangement and annotation status

    Written arrangements, actual use and land register annotation are documented.

  3. 03
    Administration

    Record contributions and decisions

    Cost allocation, outstanding contributions and the role of sections 833 to 835 ABGB are known.

  4. 04
    Outlook

    Decide on partition or stay

    Partition in kind, partition auction under section 352a EO and long-term co-ownership are assessed.

  5. 05
    Bid

    Price in share-specific factors

    Blocking risks, administration costs and partition costs are calculated.

  6. 06
    Award

    Open communication with co-owners

    The buyer introduces themselves in the community and orders first decisions.

Important: Acquiring an ideal share does not bring a specific apartment. Only a use arrangement annotated in the land register under section 828(2) ABGB binds the buyer without further examination. Section 352a EO sets a separate minimum bid rule for partition auctions.
FAQ

Common questions on the co-ownership share

Do I get a specific apartment with the award? +
No. You acquire an ideal share of the property, not a physical part. Whether an existing use arrangement binds the buyer depends in particular on section 828(2) ABGB and an annotation in the land register.
Can the other co-owners block me? +
Ordinary administration is decided by majority by shares under section 833 ABGB. Important changes run through sections 834 and 835 ABGB and generally require consent. Blocking risks can only be assessed for the specific community.
Can I demand partition after the acquisition? +
In principle yes, since section 830 ABGB grants the claim to every co-owner. It is not always immediately enforceable; the objections of untimely partition and of detriment must be considered. Where physical partition under section 843 ABGB is not feasible, sale follows under sections 352 and 352a EO.
How does my situation differ from a partition auction? +
In a share auction only the share of one co-owner is sold; the community survives. In a partition auction the community is dissolved; section 352a EO uses the appraised value as the starting point for the minimum bid.
What determines contributions after the award? +
Typically the ideal share. Contributions from the period before the award are a matter for the previous owner and the community under the general rules.
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Topics
Judicial auctionCo-ownershipIdeal shareUse arrangementPartitionABGBEO

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