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Keep the contract, deposit proof, inventory, photos, messages and payment records together.
For EUR 1 million in rent, repairs or risk of losing the deposit, small missing evidence can matter.
Separate what the agreement says from what actually happened.
Use Caira to draft a landlord, tenant or tribunal-ready document checklist.
Munich's Mietspiegel workflow is easiest to use when you treat it as a form exercise, not a quick estimate. The official city materials for the 2025 Mietspiegel include the information page, the service page for checking rent increases, and the Wohnungsbeschreibungsbogen. This article focuses on completing the calculator or worksheet carefully: what to gather, what to avoid, and how to preserve the result if you later need to question a Mieterhoehung.
Make a worksheet first
Before entering anything, create a simple worksheet with these headings: field, value entered, source document, and uncertainty. Your source documents may include the lease, rent increase letter, floor plan, handover protocol, energy certificate, utility bill, photos, and landlord messages. If a field is uncertain, mark it as uncertain. Guessing may give you a neat final number, but it weakens the calculation if the landlord challenges your assumptions.
Rent and payment fields
Separate the cold rent from other payments. Munich tenants may pay one monthly amount that includes cold rent, operating-cost advances, heating advances, parking, furniture, or side agreements. The Mietspiegel comparison should not be built from the wrong total. If your rent increase letter does not show the current cold rent and proposed cold rent clearly, ask the landlord to break it down before you rely on the calculator result.
Wohnflaeche
The living-area field can change the outcome, so use the best supported number. Start with the lease, but compare it with a floor plan, measurement, utility allocation, or any correction previously acknowledged by the landlord. Do not round up because it seems easier. If you rent only a room or have an unusual shared arrangement, be careful about whether the Mietspiegel input should describe the whole dwelling or your arrangement; that may need local advice.
Building and location details
Use the building's construction period, not the move-in year or the last renovation year. For location-related fields, follow the Munich tool and official materials rather than your own view of whether the neighbourhood feels central or quiet. If a rent increase letter uses a different construction period or location assumption from the one you entered, save both versions and note the difference.
Where the form asks about modernisation, do not treat every repair as an upgrade. Replacing a broken item, renovating before your tenancy, or improving the building may have different significance. Record the date, scope, and proof you actually have.
Working through the Wohnungsbeschreibungsbogen
The Wohnungsbeschreibungsbogen is helpful because it asks about apartment characteristics in a structured way. Read each description closely. A feature should not be counted just because it sounds similar in ordinary speech. For example, a modernisation detail may require a specific type or timing of work; a kitchen or bathroom feature may depend on what is actually provided by the landlord; and a defect may affect how you describe the dwelling. Take photos of important features and defects before you send any response.
Common form mistakes
Do not enter warm rent. Do not use an old Mietspiegel without noticing the year. Do not accept the landlord's Wohnflaeche or equipment list without checking your documents. Do not ignore the difference between a feature that exists and a feature that works. Do not delete inconvenient facts from your own worksheet. And do not treat the final number as a complete legal answer; it is one part of reviewing the rent increase.
Ask for the landlord's inputs
A concise German request can keep the conversation factual:
Betreff: Angaben zum Wohnungsbeschreibungsbogen und zur Mietspiegel-Berechnung
Sehr geehrte/r [Name], bitte teilen Sie mir mit, welche Angaben Sie fuer die Berechnung nach dem Mietspiegel fuer Muenchen verwendet haben. Insbesondere bitte ich um Angaben zu Wohnflaeche, Baujahr, Ausstattungsmerkmalen, Modernisierung, Nettokaltmiete und dem errechneten Vergleichswert. Mit freundlichen Gruessen, [Name]
Save the evidence trail
Keep the completed worksheet, calculator output, screenshots, rent letter, lease, photos, and any reply from the landlord. If you later contact a tenant association, Caira, or city advice service, this pack makes the issue much easier to assess.
Where Unwildered fits
Upload the Munich worksheet, Wohnungsbeschreibungsbogen, calculator output, rent increase letter, lease, photos, and source documents. Unwildered can help compare the fields with the landlord's assumptions and prepare a short clarification request.
Official context to check
For German rent pages, the data that matters is usually local, not national. An official city Mietspiegel can be more useful than a broad rent statistic because it ties the comparison to location, size, age, condition and equipment.
Sources
Gesetze im Internet: BGB tenancy provisions
Federal Ministry of Justice tenancy guidance
city Mietspiegel source
This article is general information, not legal, financial, medical or tax advice.
