Tenants: Who Pays for Insulation & Windows in Austria

Maintenance & repair duties (MRG §3) 2 min read · published September 10, 2025

Many tenants in Austria wonder during renovations: who bears the costs for insulation or replacing windows, and what obligations does the landlord have? This text explains in plain language which legal foundations apply, how repair and maintenance duties are distinguished, and when tenants must consent. You will receive practical tips on which documents are important, how to check quotes, and when a rent adjustment may be legally possible. The goal is for tenants to know their rights, avoid conflicts, and develop clear steps in case of dispute. Concrete references to relevant laws and official bodies help prepare conversations or a formal complaint. If necessary, you will find advice on meeting deadlines and securing evidence.

Who pays for insulation and window replacement?

Whether the landlord or tenant pays depends on whether the work is a necessary repair, maintenance, or an upgrade. Repairs to maintain habitability are generally the landlord's responsibility; major modernizations that increase property value may be treated differently. Relevant rules can be found in the Mietrechtsgesetz (MRG) and general provisions on maintenance obligations.[1]

  • The landlord usually pays for necessary repairs and restoring the rental property.
  • For energy-related modernizations, the landlord may advance costs; rules on allocation or rent adjustment often apply.
  • Minor repairs can be assigned to the tenant under the lease if reasonable limits are set.
  • If windows must be replaced due to defects, the landlord is often responsible; voluntary tenant replacements need consent.
Document defects and costs in writing.

Rights and obligations explained

The landlord must keep the apartment in the contractual condition. Clauses on minor repairs are valid if they include reasonable caps and do not impose disproportionate costs on tenants. Modernization work that increases usability may entitle the landlord to adjust rent under certain conditions; notice periods and information duties apply.

What tenants should do in practice

  • Send photos and written defect reports to the landlord and obtain proof of receipt.
  • Obtain written cost estimates before work begins.
  • Observe deadlines: review and respond to notices promptly.
  • Contact official bodies or seek legal advice if unsure.
Respond to formal letters within deadlines to avoid losing rights.

Frequently Asked Questions

Who bears the costs for energy-efficient insulation?
Energy-related modernizations are usually considered upgrades; the landlord may invest, but partial cost allocation or rent increases may apply.[1]
Can the landlord replace windows without consent?
For necessary repair work the landlord may act; for measures beyond maintenance, tenant consent or a notice with deadlines is often required.
Where to turn in case of dispute?
Try to resolve issues amicably first and keep all documents. For legal disputes district courts have jurisdiction and formal complaints or actions are possible.[2]

How-To

  1. Step 1: Document the defect: photos, date, and written notification to the landlord.
  2. Step 2: Get and compare cost estimates.
  3. Step 3: Contact the landlord, set deadlines and request written confirmation.
  4. Step 4: If no agreement: consider legal steps and consult the district court or advisory services.

Help & Support


  1. [1] RIS: Mietrechtsgesetz (MRG §3)
  2. [2] JustizOnline: e‑Forms and Services
Bob Jones
Bob Jones

Editor & Researcher, Tenant Rights Austria

Bob writes and reviews tenant law content for various regions. They’re passionate about housing justice and simplifying legal protections for tenants everywhere.