Rent reduction during renovation in an Austrian apartment building: affected units, evidence and income risk

Renovation in an apartment building can affect individual flats, commercial premises and shared facilities in different ways. Owners and buyers therefore need more than a building-wide assumption. They need the affected unit, actual use, period, evidence and a reliable place in the income model.

Section 1096 ABGB links the rent consequence to the duration and extent of unusability. Section 3 MRG classifies maintenance duties and work, but it does not replace a review of the actual restriction. This article connects the works file, rent roll, tenant correspondence and purchase contract.

Rent reduction in an apartment building starts with the affected unit

The first question in an apartment-building renovation is not how many units the building contains. It is which unit actually experiences which intervention. Noise in the stairwell, a closed laundry room, scaffolding in front of a window and an unusable kitchen are different restrictions. The same construction phase may affect a ground-floor flat differently from a unit directly below the roof.

The property file should therefore list each unit, lease, affected room, start of works and expected end. For commercial premises, opening hours, customer access and the agreed business use also matter. The topic on old buildings, renovation and maintenance provides the wider framework, but it does not replace a unit-by-unit review.

Section 1096 ABGB measures duration and extent of the restriction

Section 1096(1) ABGB requires a landlord to maintain the leased property in a usable condition and not interfere with the agreed use. If the property becomes unusable for its agreed purpose during the lease without fault by the tenant, rent is not payable for the duration and to the extent of the unusability. The provision does not create a fixed table of percentages for renovation projects.

The practical assessment therefore looks at actual use, intensity and duration. A complete closure of an essential room is different from short, intermittent disruption. The seriousness cannot be derived from construction cost or project size alone. The article on maintenance works in an apartment building helps separate the landlord’s maintenance duty from the economic planning of the project.

Section 3 MRG classifies maintenance work, not the reduction percentage

Section 3 MRG requires the landlord, within its applicable scope, to maintain the building, the rented units and jointly used facilities in the local standard and to remove serious health hazards. It covers, among other matters, work on common parts, necessary work in rented units, operation of existing shared facilities and publicly required introductions or alterations.

The classification under section 3 MRG does not by itself determine whether the rent for a specific tenancy is reduced or by how much. The maintenance duty and the restriction of use must be documented side by side. For lifts, fire safety and accessibility, the concrete finding must be linked to actual access and use. The article on lifts, fire safety and accessibility illustrates this distinction for common facilities.

Document renovation works and the actual restriction of use

A reliable file begins before the first intervention. Photographs, condition records, the construction schedule, work orders, notices and tenant reports should be stored by date and unit. For recurring noise or changing access restrictions, short contemporaneous records are usually more informative than a general summary prepared later.

Each report should identify what could not be used, when the restriction began, when it ended and what alternative was offered. “The building was a construction site” does not show which unit was affected. Conversely, one noisy workday does not automatically prove continuing unusability. Evidence should describe actual use rather than a label.

Communication is part of the file. Notices, postponements, access arrangements and information about temporary routes may explain the actual period of restriction. Promises made by the property manager to individual tenants must not disappear from the purchase review.

Record period and extent in the rent roll

The rent roll should contain a separate risk field for every affected unit or link to a detailed works table. Record start, end, affected rooms or facilities, type of restriction, tenant reports and communication status. The table should distinguish full use, restricted use and temporary vacancy.

For the income model, the contractual rent structure should be kept separate from the reduction question. The current demand is not automatically the amount that will be lost. A forecast loss is also not a fixed receivable while cause, period and extent remain unresolved. A scenario model is more reliable than a general percentage assumption.

The article on major rent increases under section 18 MRG addresses financing of major maintenance separately. Financing a maintenance project does not automatically establish the use situation of each tenancy and does not replace evidence of a concrete restriction.

Review lifts, fire safety and accessibility separately

Work on shared facilities may affect many units, but not always in the same way. A lift outage affects upper floors and people with reduced mobility differently from a ground-floor flat. A fire-safety closure can change access without making the living rooms unusable. Scaffolding, protective roofs and façade work may affect light, ventilation or outdoor areas for selected units.

Fire-safety work should distinguish a short inspection, a phased closure and an actual restriction of the agreed use. For accessibility, record which route or facility is affected. Keep the legal reason for the work, such as maintenance or a public-law requirement, separate from the actual effect on use.

For a purchase agreement, prepare a list of open works with affected units, phase, evidence status and expected effect. The parties can then link the allocation to concrete events instead of transferring an undefined “renovation burden”.

Secure income risk in the model and purchase contract

An apartment-building acquisition should connect two levels: normal contractual income and the risk of temporary restriction. No general reduction percentage is needed. A unit matrix can instead record base rent, affected use, period, evidence quality and the economic scenario that remains open.

The purchase agreement should describe known works, reported restrictions and open communications. Depending on the facts, disclosure, guarantee, indemnity, retention or a post-completion process may be appropriate. The key questions are who provides information, who communicates with tenants and who processes an economic adjustment after the cut-off date.

The due diligence and data-room topic provides the document structure. The apartment-building purchase topic places the risk in the wider acquisition review. A tool may help organise timing, but it cannot replace review of the individual tenancies.

Common errors in rent reduction during renovation

The first error is a building-wide percentage. An apartment building is not one tenancy, and the actual restriction must be assessed for each unit and use.

The second error is treating construction cost as proof of a rent reduction. High cost may explain a maintenance project, but it says nothing by itself about the use of a particular unit.

The third error is omitting the timeline. Without start, end, interruptions and reinstatement, it is unclear for which period a risk exists.

The fourth error is a general percentage assumption. Section 1096 ABGB refers to duration and extent of unusability, not to one rate for all renovation projects.

The fifth error is confusing the issue with rent review proceedings. Those proceedings concern the permissible rent level. A concrete restriction during works is a different question and should not be used as a measure for the temporary restriction.

Special cases involving vacancy, commercial premises and transfer

For a unit already vacant, first establish whether the works affect a current tenant’s use or only delay planned reletting. Vacancy and rent reduction should not be mixed in the income model without factual support.

Commercial premises require closer attention to the agreed business purpose, opening hours, customer traffic, deliveries and technical installations. Works may substantially affect business use even if the rooms remain physically accessible. The lease and actual operation must be read together.

If ownership or management changes during the works, transfer the full evidence file. Open reports, promises, records and tenant arrangements should be linked to the economic cut-off date. The apartment-building purchase topic explains how open matters fit into the transaction review.

Key points for the apartment-building income model

Rent reduction during renovation is not derived from construction volume or a building-wide rate. The relevant factors are the unit, actual restriction, duration and extent. Section 1096 ABGB is the central starting point.

Section 3 MRG explains which maintenance work the landlord must organise within the applicable scope. Maintenance duty and reduction risk must nevertheless be recorded separately. Buyers and owners need a unit matrix with evidence, timeline and economic allocation.

Connecting that matrix with the rent roll, data room, communication and purchase contract makes open income risk negotiable on facts. General reduction percentages and undocumented assumptions do not belong in a reliable apartment-building model.

Subscribe to legal updates

Receive new articles and legal updates through BRANDaktuellen Rechtsnews.

How we support owners and buyers

We organise renovation records, tenant correspondence and the rent roll by unit. We separate the maintenance duty, the actual restriction of use and its economic effect. For the purchase contract and income model, open periods, evidence and responsibilities are described so that the agreement reflects the documented property.