For tenants

Your Kaution, protected.

Move in or move out: scan the apartment with the app to document its condition – photos and meter readings – and go into the deposit conversation with proof. Free German tenancy-law guides and calculators alongside, any time.

Coming soon Free guides & calculators
Protects your Kaution Guides & calculators free Data stored in Germany
Übergabeprotokoll · €10

A next-generation Übergabeprotokoll.

You scan the flat with the app – the AI detects any defect and marks it right on the photo. At the end you have a clean, timestamped protocol as a PDF that protects your Kaution. Move-in or move-out.

  • Scan the rooms. The guided camera walks you across walls, floor and ceiling – so nothing gets missed.
  • The AI detects any defect. Cracks, mould, water stains, damage and scratches – each marked right on the photo. You confirm with a tap.
  • Meters & keys. Photograph the meter – the AI reads the digits. Count the keys, done.
  • PDF for both sides. A timestamped protocol, emailed instantly to both.
  • Photos backed up for a year. Stored securely in Germany – and you can delete them anytime.
€10per protocol · no subscription, no account
Coming soon Guide: Wohnungsübergabe at move-out →
ÜbergabeprotokollMove-out
Kitchen
4 photos · meter 4102 kWh
Captured
Living room
Scratch was already there
Noted
Keys
handed over
Free calculators

Paying too much? Find out in minutes.

Upload your Nebenkostenabrechnung – HausMaus goes through every item with you and the AI spots typical errors: the wrong Verteilerschlüssel, non-chargeable costs, missed deadlines. At the end you know whether your statement adds up and what you can do about it.

  • Upload or photograph your statement
  • Go through every item with the AI
  • Clear result: it's fine – or you're paying too much
Check your statement Guide: check your Nebenkostenabrechnung →
2025 statementCheck
Heating & hot water
Verteilerschlüssel correct
OK
Admin costs
not chargeable
Error
Possible refund
check complete
≈ €90
Guides & knowledge · free

Know your rights – without the legalese.

From the deposit through rent increases to mould: our guides explain what German tenancy law really says and how you apply it. Every guide is based on the letter of the law, with each paragraph cited and linked – free to read, no account.

  • Pick a topic – deposit, rent, defects, Übergabe
  • A clear explanation with the legal source
  • The right tool to check it on the spot, right there
Open the guides Popular: reclaim your deposit →
Guides for tenantsfree to read
Check the Mietpreisbremse
Am I paying too much rent?
§556d
Rent reduction for defects
Mould, heating, noise
Rights
Reclaim your deposit
When do I get it back?
Money
Built on German tenancy law

Every check, every guide is aligned with German tenancy law.

From the Nebenkostenabrechnung (§556 BGB, Betriebskostenverordnung) through the deposit to the Übergabe, HausMaus keeps the rules in view. So you understand what you're entitled to – clear and fair.

Data stored in Germany GDPR-compliant Checked against German tenancy law Free for tenants, no invitation needed

HausMaus provides general information, calculators and templates – not legal advice. When in doubt: a tenants' association or a lawyer.

Frequently asked

Good to know

Yes. The tools and the app are permanently free for tenants: check your Nebenkostenabrechnung, read the guides, use the calculators and – if your landlord uses HausMaus – the full app. Only the Übergabeprotokoll is a service you can book on its own for €10 per protocol.
Yes. You can check your Nebenkostenabrechnung, use the guides and calculators and create an Übergabeprotokoll – with no invitation or account from your landlord.
You upload your statement and HausMaus goes through every item with you – in line with §556 BGB and the Betriebskostenverordnung. The AI spots typical errors and shows you clearly what was allocated and how. Free, no account. There's a walkthrough in the guide on checking your Nebenkostenabrechnung.
€10 per protocol. You document your move-out with photos and meter readings and get a PDF – usable without an account. A clean protocol protects your deposit.
HausMaus helps you do it: a clean Übergabeprotokoll at move-out documents the condition of the flat, and the guides explain when and how you reclaim your deposit. More in the guide on reclaiming your Kaution. Note: HausMaus does not provide legal advice.
Yes. Your data is stored in Germany and processed in line with the GDPR.
No. HausMaus provides general information, calculators and templates, but not legal advice. When in doubt, contact a tenants' association or a lawyer.

Start with a single step.

Check your Nebenkosten, read a guide or record your move-out – you decide what you need today.

Check Nebenkosten Open the guides