Rent increase in Norway - when can a landlord introduce one and by how much?

Has your landlord informed you that your rent will increase by several hundred or several thousand NOK from next month? Before accepting the new rate, check the basis for the increase, how it was calculated, and when the notice was given.

In this article, we explain when a landlord in Norway can increase rent, how CPI indexation works, and how it differs from an adjustment to the average rent. We set out the rules in force as of October 14, 2026.

Which rent increases are legal?

During the term of the agreement, the landlord cannot freely change the rent amount. The Norwegian Tenancy Act generally provides for two methods:

1. indexation based on the CPI, meaning the Consumer Price Index,
2. adjustment to gjengs leie (the average rent in comparable, ongoing tenancy agreements).

The last rent determination may be the start of the agreement, an earlier CPI indexation, or an earlier adjustment to gjengs leie.

A contractual provision cannot deprive you of statutory protection. A clause allowing the landlord to increase rent more frequently, without the required notice, or above the permitted limit should not be applied. We describe the parties' other rights in the article What are the obligations of a landlord and tenant in Norway?

Rent indexation based on the CPI

The CPI is the general indicator of price changes for goods and services purchased by households. It is published monthly by Statistics Norway, SSB. For rent indexation, the general index is used, not a separate housing cost index.

The landlord may apply indexation if all of the following conditions are met:

• at least 12 months have passed since the most recently determined rent took effect,
• the increase does not exceed the CPI increase since the last rent determination,
• you receive written notice at least 1 month in advance.

The increase does not happen automatically. The landlord must send you a request and state the new rate. If the agreement took effect on January 1, 2026, the notice may be sent no later than December 1, 2026, and the new rent may apply no earlier than January 1, 2027.

How do you calculate a CPI-based increase?

There is no single statutory percentage limit or maximum amount in NOK. The permitted increase depends on the CPI change between the relevant months.

New rent = current rent x current CPI / CPI in the month of the last rent determination

As of October 14, 2026, the most recently published data concerns September 2026:

• CPI in September 2025: 100.6,
• CPI in September 2026: 104.0,
• year-on-year increase: 3.4%.

Example for rent determined in September 2025:

15,000 NOK x 104.0 / 100.6 = approximately 15,507 NOK

The landlord may therefore increase the monthly rent by approximately 507 NOK, to approximately 15,507 NOK.

Indexation skipped for several years

If the landlord has not indexed the rent for several years, they may take into account the total CPI change since the last actual determination of the rate. The limit does not then have to correspond only to inflation over the last 12 months.

However, the landlord cannot demand back payments for previous months. The new rate applies only after proper written notice has been given and at least one month has passed.

If the CPI falls, you may also request a corresponding rent reduction in writing.

Adjusting rent to gjengs leie

Gjengs leie means a representative, average rent in ongoing agreements for similar properties and comparable tenancy terms. It is not automatically the rate shown in new listings, because listings mainly show prices for newly concluded agreements.

The landlord may request such an adjustment if:

• the tenancy has lasted at least 2 years and 6 months,
• during that period, the rent was changed only in line with the CPI,
• the request was submitted in writing,
• at least 6 months will pass from the notice to the new rate taking effect,
• at least 1 year will pass since the previous rent change.

In practice, the first adjustment to gjengs leie can take effect no earlier than after 3 years of tenancy.

There is no fixed percentage limit under this method. The comparison should take into account, among other things:

• the locality and part of the city,
• floor area and number of rooms,
• the standard and equipment,
• the type of building,
• whether the property is furnished or unfurnished,
• the notice period and other contractual terms,
• additional services included in the rent.

If improvements to the property were carried out or financed by you, the value resulting from your work and expenses should not be included when determining gjengs leie.

Under the same rules, you may request a rent reduction if the rate you are paying is higher than the average rent for comparable properties.

Notice, prohibited charges, and objections

What should the notice include?

The law requires written form and compliance with the relevant deadline. For evidentiary purposes, the notice should include:

• the property address and the parties' details,
• the current rent amount,
• the basis for the increase,
• how the new amount was calculated,
• the new monthly rate,
• the exact date when the increase takes effect,
• the CPI months and values, or data on comparable properties.

It is worth keeping the email, a message from the tenancy management system, or the letter together with proof of delivery.

Costs that do not justify an arbitrary increase

An increase in the landlord's loan interest, renovation costs, insurance, property tax, waste collection, or administrative fees does not allow the rent to be raised above the limits set by law. The landlord also cannot circumvent these rules by introducing new charges for keys, renovations, insurance, or ordinary property maintenance.

Only the following, if agreed in the contract, may be charged separately:

• electricity and heating fuel,
• water and sewage, if the charge depends on metered consumption.

These charges are not indexed according to the CPI. They may be adjusted to actual and necessary costs.

How can you challenge an increase?

The disputed difference can be deposited in accordance with the statutory procedure. You must inform the landlord of the basis of the dispute and give them 14 days to cooperate in opening a deposit account. Properly depositing the disputed amount protects you against termination or cancellation of the agreement due to non-payment.

A complaint to Husleietvistutvalget must be written in Norwegian. In 2026, the fee for a tenant is 269 NOK, and the waiting time stated in October for a new case to begin being considered is approximately 11 months. Attach the agreement, notice, calculations, payment confirmations, and correspondence to the complaint.

If you have paid rent higher than permitted, you may claim a refund of the difference together with interest from the date of payment. Monetary claims generally become time-barred after 3 years, although the start and interruption of this period depend on the circumstances of the case.

FAQ - frequently asked questions

Summary

• During the tenancy, the landlord may apply CPI indexation or adjustment to the average rent for comparable properties.
• Indexation requires at least 12 months since the last rent determination and written notice at least 1 month in advance.
• An adjustment to gjengs leie can usually take effect no earlier than after 3 years of tenancy and requires at least 6 months' notice.
• An increase exceeding the statutory limit, introduced retroactively, or made without following the procedure may be challenged.

If you need help with official matters in Norway, call us: +47 21 38 38 21.

Article author: Marcin - marcin@efirma.no