Rent increase versus tenant retention for a small multifamily in Berlin?

reviewTheKite

Homeowner
I’m reviewing one tenancy in a small multifamily in Berlin. Comparable asking rent appears to be around €1,404, while the tenant currently pays about €1,249. They pay reliably and look after the home.

Would you make a modest adjustment or prioritise retention? I’m concerned that pushing too far could mean turnover, vacancy and refurbishment costs. I also want any review to follow the applicable local notice and rent rules without damaging a good relationship.
 
I would not treat €1,404 as an automatic target. Asking rent for a new listing may not establish what can lawfully be charged under an existing Berlin tenancy. First confirm the permitted basis and procedure for an increase. If there is room, a smaller rise that recognises the tenant’s reliability could be more valuable than chasing the full €155 monthly gap.
 
Also, what does the €1,404 comparison actually cover: the same area, size, condition and rental components? And when was the current rent last changed? Those details affect both whether the comparison is meaningful and what process may apply.
 
We have already established that the €1,404 asking figure cannot simply be applied to this tenancy. What remains unclear is whether a lawful, well-supported adjustment from €1,249 is available and whether it would materially help fund the unit over time.

Doing nothing for now is reversible; losing a reliable tenant after pressing for the full €155 gap is not. Still, keeping one unit substantially out of line forever can also make maintenance harder to cover. I would verify the permitted basis first, then compare a moderate increase with the actual vacancy and reletting costs rather than treating retention as an automatic reason for no change.
 
That said, maintenance history matters. If repairs have been delayed or the tenant has repeatedly dealt with disruption, this may be a poor moment to ask for more. Complete outstanding work first, then explain the reasoning in writing rather than presenting the asking-rent figure as a take-it-or-leave-it demand.
 
The full gap is €155 per month, or €1,860 over a year before considering any vacancy, refurbishment, advertising or administration. Even a short empty period could absorb much of that. I’d estimate those costs for this particular unit, then compare them with the additional rent from a smaller lawful adjustment over the expected retention period.
 
Do not overlook the end-of-tenancy workload either. Condition disputes and deposit handling can consume time even where the tenant has generally been careful. A reliable payer who reports issues and maintains the flat has an economic value that does not appear in the headline rent comparison. Keep the deposit separate from the rent discussion and follow the applicable German rules if the tenancy eventually ends.
 
A sensible sequence would be: verify that the €1,404 figure is genuinely comparable, obtain Berlin-specific guidance on the permitted amount and notice process, list any outstanding maintenance, and calculate a realistic turnover budget. Then communicate one moderate, properly supported proposal. If the lawful increase is small or the comparison is weak, retaining this tenant at €1,249 may be the stronger outcome.
 
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