When to use it
Use it when a rent increase should be prepared as a check protocol without claiming legal review.
Budget and monthly load
Rent increase check
Read current rent, new rent, comparable rent, timing and cap as a cautious check signal.
Your check signal
Result logic
- Monthly loadread recurring cost or ratio first
- Reservekeep buffer and follow-up cost visible
- Assumptionsmark estimates before committing
More context
When you want to check deeper.
Read the inputs correctly
Current base rent, proposed base rent, comparable rent, months, cap and modernization note create a cautious signal.
Avoid this mistake
The calculator has no local rent-index database. You must take the comparable value from source or reasoning.
Next action
Open the matching rent-index city page or sources list and document the value in the apartment dossier.
Rent burden ratioData and documents
- increase letter
- rent-index value
- current base rent
- timing
Directly useful templates
Common questions
Does the signal decide admissibility?
No. It sorts suspicious points and source needs but does not replace case-specific review.
Which assumption should stay visible?
Check signal based on visible inputs. No rent-index lookup, no contract review and no case-specific legal opinion.
What is the next useful step?
Open the matching rent-index city page or sources list and document the value in the apartment dossier.
Decision help
What Rent increase check really clarifies.
Use it when a rent increase should be prepared as a check protocol without claiming legal review. The important part is not to treat the output as one winning number. It is a plausibility value for viewing, acceptance, moving or household planning.
Current base rent, proposed base rent, comparable rent, months, cap and modernization note create a cautious signal. If an input is estimated, keep it visible. That way you later know which figure came from a contract, offer, measuring tape or bill and which was only a provisional assumption.
Check before deciding
- Current base rent
- New base rent
- Local comparable rent
- Months unchanged
- Cap %
Keep these documents ready
- increase letter
- rent-index value
- current base rent
- timing
Do not misread it
The calculator has no local rent-index database. You must take the comparable value from source or reasoning.
Open the matching rent-index city page or sources list and document the value in the apartment dossier. The next useful cross-check is Rent burden ratio, because it tests the same housing decision from a second angle.
Calculation path
Do not read the output in isolation.
Calculation path
Increase = new base rent − current base rent; rate = increase / current base rent × 100
Assumptions
Check signal based on visible inputs. No rent-index lookup, no contract review and no case-specific legal opinion.
Common misreadings
Looking only at the new amount is not enough; reasoning, timing, comparable rent and cap belong in separate checks.