My Czech landlord raised the rent: do I have to agree?

A landlord writes that the rent will be higher next month. The first question is not whether the new amount feels fair. It is which legal route the landlord is using: an agreed inflation clause, a proposal to amend the lease, or the statutory rent-increase process. Each gives you a different decision and timeline.

Three different situations that look like one increase

• An inflation clause in the lease. Check which index, reference period, timing, and notification method the signed clause actually uses. The landlord cannot simply replace that formula with a number chosen later.
• A proposed agreement. The landlord may ask you to sign an amendment with a new rent. You can negotiate or decline; do not confuse the proposal with a completed unilateral increase.
• The statutory process. If the lease does not provide another mechanism, the landlord can make a written proposal under the Civil Code, subject to limits and deadlines.

The 20% rule is a ceiling, not an automatic entitlement

Under the statutory route, government guidance says the landlord may propose an increase no more than once in twelve months, up to comparable local rent. Together with previous increases, it must not exceed 20% over the preceding three years. The calculation concerns rent, not service or energy advances.

That still does not mean every proposal under 20% is correct. Ask what comparable rent the proposal relies on, verify which prior increases are included, and make sure the starting figure excludes services.

Three listing screenshots are not automatically proof

Government Regulation No. 453/2013 describes two ways to establish comparable local rent for a particular apartment: an expert opinion, or provable evidence of at least three comparable rents. The comparison must account for both the tenancy terms and the apartment’s residential value, including size, equipment, condition, building type, and location. Asking prices from unmatched advertisements are therefore a useful market signal, but not automatically the statutory comparison.

What happens after delivery?

• You agree: government guidance describes a two-month period for written consent. Paying the proposed amount can also be treated as agreement. The increased rent is then paid from the first day of the third calendar month after delivery.
• You do not agree: the rent does not automatically jump merely because the landlord sent a proposal. The landlord may, within the following three-month period, ask a court to determine the rent. The Supreme Court says the court-determined amount becomes payable only after the judgment is final, although the determination can take effect from the date the claim was filed.
• You want to negotiate: put the alternative amount, start date, or gradual increase in writing. Make clear whether it is a counterproposal rather than acceptance of the original amount.

Do not mix rent with service advances

A higher monthly payment may come from changed advances for water, heating, waste, or other services rather than a higher rent. Ask for the calculation and the reason for the new advance. Service reconciliation, rent increases, and direct energy contracts are different issues with different evidence. Use the focused service-advance notice and effective-date test.

A useful written response

• Identify the proposal and its delivery date.
• State whether you agree, disagree, or need supporting calculations.
• Request the comparable-rent evidence and a breakdown of rent versus services.
• Keep the tone factual and keep paying the existing undisputed amount on time.
• Save your reply and proof of delivery with the lease.

If the increase makes the home unaffordable

Run two tracks at once: protect your position on the proposal, and check the real replacement market. Compare total monthly cost, deposit, agency commission, moving costs, commute, and the availability of apartments matching your constraints. A cheaper headline rent can still cost more in the first three months.

If the conversation turns into pressure to leave, use the rental termination notice checklist. A disagreement over a proposal and a valid termination of the tenancy are not the same event.