Rent increase in Denmark: When and how much can rent rise?

Updated October 2026. Have you received a letter saying your rent is going up? Or are you a landlord who wants to know what you can ask for? The answer depends on three things: what your lease says, where the home is, and when the building was constructed. An increase in line with the nettoprisindeks (net price index) only requires a written letter, as long as it has been agreed. Other rent increases must be given with 3 months’ notice, and as a tenant you often have only 6 weeks to object.

This guide covers private rental homes under lejeloven (the Danish Rent Act, in Danish). If you live in an almen bolig (non-profit housing run by a boligforening, a housing association), different rules apply.

Short answer: when can the rent go up?

A landlord can’t simply raise the rent because the market has gone up. Any increase needs a legal basis, meaning grounds in the law or in the lease. The most common ones are:

Basis for the increase	Where does it apply?	Notice	Can the tenant object?
Net price index adjustment by agreement	Tenancies where it is written into the lease	No fixed notice. Written notification is enough (§ 53(2) and § 54(3))	No special 6-week deadline, but disputes can be brought before Huslejenævnet
Cost-based rent (operating budget)	Larger, older buildings in regulated municipalities	Takes effect on the 1st of the month 3 months after the demand (§ 23(3))	Yes, within 6 weeks (§ 29 and § 30)
Det lejedes værdi (the rental value)	Mainly unregulated municipalities and small buildings	3 months (§ 44(1))	Yes, within 6 weeks (§ 44(3))
Higher property tax and public charges	All types, according to the rules	3 months (§ 46(3))	Yes, within 6 weeks (§ 46(5))
Fri leje (free rent setting)	E.g. buildings taken into use after 31 December 1991	As agreed, typically the net price index	The agreement can be reviewed under section 36 of aftaleloven (§ 55)

The section numbers refer to lejeloven. Below we go through each type so you can see which one fits your home. Huslejenævnet is the local rent tribunal that settles disputes between tenants and landlords.

Step 1: Find out which rules your home follows

Regulated and unregulated municipalities

A regulated municipality is one where the old rent control rules applied, or where the municipal council has decided that the municipality should be regulated. The council can also lift the regulation again, and the decision must be published in Statstidende, the official Danish gazette (lejeloven §§ 4 and 5). Most municipalities are regulated, including, according to common overviews, the big cities. There is no single official list, though, so the safest option is to ask the municipality or Huslejenævnet.

In a regulated municipality, chapter 3 on omkostningsbestemt leje (cost-based rent) applies to most tenancies. Here it is the building’s costs plus a return set by law that cap the rent, not the market (§ 6(1) and § 19).

In an unregulated municipality, the rent is generally adjusted according to det lejedes værdi (the rental value). The rent is compared with what similar homes in the area cost, based on location, type, size, quality, fittings and state of maintenance (§ 42(2)).

The exceptions that change the picture

Even in a regulated municipality, the strict rules don’t always apply:

• Small buildings. Buildings that had 6 or fewer residential flats on 1 January 1995 are not covered by the rules on cost-based rent. The same goes for newer buildings if they had no more than 6 flats when they were taken into use (§ 7). For these, the rules on the rental value apply, but the rent must not substantially exceed the rent for comparable cost-based tenancies (§ 32).
• Substantially improved tenancies. If a flat has been gennemgribende forbedret (substantially improved) under § 19(2), the rent may be set according to the rental value instead of the cost-based rules. A number of conditions apply, for example on improvement costs, inspection and energy rating.
• Free rent setting. Flats in buildings taken into use after 31 December 1991, certain former commercial premises, and newly converted attics and added storeys can have fri leje (§ 54). This is explained further in our article on fair rent.

Quick check of your home

1. When was the building taken into use? After 1991: probably fri leje.
2. How many flats are in the building? 6 or fewer: the rules for small buildings.
3. Is the home in a regulated municipality? Yes, and the building is older and larger: as a starting point, cost-based rent.
4. What does the lease say? Look especially at § 3 on the rent and § 11 on special terms. Does it mention the net price index, fri leje or § 19(2)?

Net price index adjustment: the most common increase

Many tenants receive a short letter every year saying the rent is going up by a few percent. This is typically a nettoprisindeksregulering (net price index adjustment). The net price index from Danmarks Statistik (Statistics Denmark) measures price changes excluding taxes and subsidies.

The rules

• It must be agreed in the lease. Without an agreement, the landlord can’t index the rent.
• The rent can be adjusted once a year (§ 53(2)).
• The landlord can introduce the increase simply by written notification to the tenant. No 3 months’ notice is required (§ 53(2), and for fri leje § 54(3)).
• Since 1 January 2024, net price index adjustment can once again be agreed in tenancies with cost-based rent and in substantially improved tenancies. This came about through an amendment that corrected an error from the 2022 consolidation of lejeloven (Act no. 1793 of 28 December 2023, in Danish). Special transitional rules apply to agreements made between 1 July 2022 and 31 December 2023.
• The 4 percent cap only applied to the adjustments for 2022 and 2023 (§ 53(3)). It does not apply to new adjustments.

Stepped rent is not allowed in newer leases

Trappeleje (stepped rent) means that the rent rises by fixed amounts or a fixed percentage on set dates, for example “3 percent every year on 1 April”. According to Københavns Kommune (Copenhagen Municipality, in Danish), it can only be agreed in leases signed before 1 July 2015. If the lease was signed later, adjustments must follow the net price index. If you have a newer lease with fixed annual increases, you should have it assessed.

Example: what does 3 percent mean in kroner?

The net price index rose 3.0 percent from September 2025 to September 2026 (Danmarks Statistik, in Danish). The typical advertised rent for a flat on Bolighub is DKK 8,995 a month (median, calculated on 19 October 2026 from listings on Bolighub, see the rental market).

If we take a rent of DKK 9,000 and a lease that adjusts according to the change from September to September, it looks like this:

• DKK 9,000 × 103.42 / 100.42 = approx. DKK 9,269
• Increase: approx. DKK 269 a month, or approx. DKK 3,200 a year.

Which months should be used depends on your lease. Note also that from 2026, Danmarks Statistik calculates the index with 2025 as the base year (2025 = 100). The landlord must use figures from the same table when calculating the change.

Rent increases in regulated municipalities: cost-based rent

If you live in an older building with more than 6 flats in a regulated municipality, the rent is cost-based as a starting point. Here the landlord can raise the rent in two ways.

1. Rent increase based on an operating budget (§ 23)

If the rent doesn’t cover the building’s necessary operating costs (e.g. taxes, insurance, cleaning, administration and provisions for maintenance) plus the permitted return, the landlord can demand that the rent be increased by the difference. However:

• The increase must not result in a rent higher than the rental value (§ 23(2)).
• It takes effect on the 1st of the month falling 3 months after the demand was made, unless otherwise agreed (§ 23(3)).
• The demand must be in writing and include the current and the new budget, the size of the increase and how it was calculated, the new rent, and information about the right to object. If any of this is missing, the demand is invalid (§ 29(1)).
• If the rent has risen by more than a certain amount per m² within the last 3 years (DKK 96 at 2021 level, adjusted annually), the landlord must at the same time inform the tenant of their right to be offered another suitable home (§ 23(4)).

2. The landlord chooses the net price index for 2-year periods (§ 26)

Instead of a new budget, the landlord can decide to adjust the rent according to the net price index for periods of 2 years, once a year. The adjustment only covers operating costs excluding taxes and charges. When the period ends, the rent must be calculated from a budget again, and if the current rent is higher, it must be reduced (§ 26(1)). Here too, the demand must be in writing with a calculation, and the increase takes effect 3 months later (§ 26(3)).

This scheme is not the same as a net price index clause in the lease under § 53(2). If you are unsure which scheme your landlord is using, ask in writing.

Objecting in regulated buildings

• Without beboerrepræsentation (an elected tenants’ committee): If at least a quarter of the affected tenants object in writing within 6 weeks, the landlord must bring the case before Huslejenævnet within a further 6 weeks if they maintain the demand (§ 29(2)).
• With beboerrepræsentation: The landlord must notify the tenant representatives at least 7 days before the demand is sent to the tenants. If the representatives can’t accept the increase, they must say so in writing within 6 weeks, and the landlord must then bring the case within a further 6 weeks (§ 30).
• Each individual tenant can, regardless of this, ask Huslejenævnet to decide whether the landlord is charging more rent than permitted (§ 38). If you have paid too much, you can claim the money back. After moving out, the claim must be brought before the tribunal within 1 year (§ 40(1)).

While a case about a budget increase is ongoing, the landlord can charge the increase as a provisional increase, but no more than DKK 15 per m² of gross floor area a year (§ 37(3)).

Rent increases based on the rental value

The rental value applies mainly in unregulated municipalities and in small buildings. Here the landlord can demand a reasonable increase if the rent is substantially lower than the rent for comparable homes in the area (§ 42(1)). Tenancies with fri leje and certain improved tenancies are not included in the comparison (§ 42(4)).

The rules are:

• The increase can take effect no earlier than 2 years after the tenancy began, or 2 years after a previous increase of the same kind took effect (§ 42(5)).
• It must be given with 3 months’ notice (§ 44(1)).
• The demand must be in writing and state the size of the increase, the reason for it and the tenant’s right to object. Otherwise it is invalid (§ 44(2)).
• The tenant must object in writing no later than 6 weeks after receiving the demand. If the landlord wants to maintain the demand, they must bring the case before Huslejenævnet no later than 6 weeks after the tenant’s deadline has expired (§ 44(3)).
• Until the tribunal has decided the case, the landlord can charge no more than DKK 15 per m² of gross floor area a year as a provisional increase (§ 44(4)).

The opposite also applies: if the rent is substantially higher than the rental value, the tenant can demand that it be reduced. The case must be brought before Huslejenævnet within 1 year of the rent first falling due (§ 45).

Increases due to taxes and charges

If property taxes rise, or new or higher public charges are introduced, for example for water, waste collection or chimney sweeping, the landlord can pass the increase on to the tenants (§§ 46 and 47). This applies even if the tenancy is non-terminable.

• Notice: 3 months. If the demand is made no later than 5 months after the tax was imposed, it can be charged with effect from that date (§ 46(3)).
• The demand must be in writing, show the calculation and give information about the right to object (§ 46(4)).
• Objection within 6 weeks, after which the landlord must bring the case within a further 6 weeks (§ 46(5)).
• If taxes or charges fall, the rent must be reduced accordingly (§ 48).

Fri leje: what can the landlord do?

Fri leje means the rent can be freely agreed when the tenancy begins. It does not mean the landlord can freely raise it afterwards. Increases must be based on the lease, typically a net price index clause (§ 54(3)). For newly converted attics and former commercial premises, the lease must state that the tenancy has fri leje (§ 54(2)).

Huslejenævnet can decide whether an agreement on fri leje is unreasonable under section 36 of aftaleloven, the Danish Contracts Act (§ 55). According to Københavns Kommune, it takes quite a lot before the tribunal reduces a validly agreed free rent.

How to object to a rent increase

1. Note the date the letter reached you. The 6-week deadline runs from then. The letter has “reached you” when it is in your letterbox or e-Boks (the Danish public digital mailbox), even if you haven’t read it.
2. Find the basis. Is it the net price index, a budget, the rental value or taxes? If this isn’t clear, that in itself is a sign the demand may be defective.
3. Check the formal requirements. Is the demand in writing? Does the letter state the size of the increase, the calculation and your right to object? If any of this is missing, the demand may be invalid.
4. Write your objection, and send it in a way you can document, for example by email that the landlord confirms, or by registered letter.
5. Keep paying the existing rent, plus anything the landlord is legally allowed to charge provisionally. Not paying can lead to a new and more serious case.
6. Wait for the landlord’s move. If the landlord maintains the demand, in most cases it is the landlord who must bring the case before Huslejenævnet within the deadline.

Example of an objection:

On 2 October 2026 I received your demand for a rent increase for the tenancy at [address]. I do not accept the demand and hereby object. I request documentation for [the calculation / the comparable tenancies / the budget]. Kind regards, [name]

You don’t need to give reasons for your objection for it to be valid, but it can help to say what you disagree with.

Three real-life examples

Maja in a 1930s building in Copenhagen with 24 flats. She receives a letter with a new operating budget and an increase of DKK 450 a month. The building is in a regulated municipality and covered by cost-based rent. The letter includes the budgets but doesn’t mention her right to object. Under § 29, the demand is therefore invalid. She writes to the landlord and objects within 6 weeks, and she talks to her neighbours, because objections from at least a quarter of the tenants are needed before the landlord has to bring the case.

Jonas in a newly built flat from 2019 in Aarhus. His lease has fri leje and a net price index clause. He is told the rent will rise by 3 percent from January. As a starting point this is lawful, provided the calculation follows the lease. He checks that the landlord has used the right months and that the rent is only adjusted once a year.

Sofie in a two-family house in an unregulated municipality. She has lived there for 18 months, and the landlord gives notice of an increase because the rent is “low compared to the market”. An increase based on the rental value can take effect no earlier than 2 years after the start of the tenancy. She objects in writing and asks for the comparable tenancies the landlord is relying on.

Common mistakes

Tenants:

• Letting the 6 weeks pass. If you don’t object in time, you generally can’t protest against the demand in the same way later.
• Stopping paying rent in protest.
• Believing that an index adjustment requires 3 months’ notice. It doesn’t, if it has been agreed.
• Comparing with advertised new builds. Advertised rents for new homes with fri leje are not the same as the rental value in an older building.
• Forgetting boligstøtte (housing benefit). If you rent privately and receive boligstøtte, you must notify Udbetaling Danmark (the public authority that pays out benefits) yourself when your rent changes (borger.dk, in Danish). Read more on our page about housing benefits.

Landlords:

• Indexing the rent without a clause in the lease, or using a stepped rent clause in a lease signed after 1 July 2015.
• Forgetting to inform the tenant of their right to object. This can make the demand invalid.
• Applying the non-cost-based rules to a larger, older building in a regulated municipality.
• Missing the 6-week deadline for bringing the case before Huslejenævnet after the tenant has objected.
• Adjusting more than once a year or using the wrong index figures.

Advice for tenants

• Read § 3 and § 11 of your lease now, so you know which adjustment you have agreed to. See also our guide to understanding a Danish rental lease agreement.
• Keep all letters about rent changes together.
• Always put things in writing. Agreements about rent made over the phone are hard to prove.
• Talk to your neighbours, especially in regulated buildings, where a quarter of the tenants must stand together.
• If in doubt, contact a lejerforening (tenants’ association) or a lawyer specialising in tenancy law before the deadline runs out.

Advice for landlords

• State the basis for adjustment clearly in the lease, for example which index months are used and when the adjustment takes place.
• Use a fixed template for notices that includes everything the law requires: amount, calculation, reason and information about the right to object.
• If you want to be able to demand an increase based on the rental value during a non-terminable period, you must have reserved that right in the lease (§ 44(5)). See also non-terminable lease agreement.
• Keep track of the deadlines after an objection, and get advice on large or uncertain increases.

Checklist: when you receive notice of a rent increase

• On what date did the letter reach you?
• What basis is the landlord using (index, budget, rental value, taxes)?
• If it is an index adjustment, is it written into the lease?
• Is the demand in writing with the amount, calculation and information about objecting?
• Is the notice long enough (3 months, where required)?
• Has it been more than a year since the last index adjustment?
• Has it been at least 2 years since the tenancy began or since the last increase based on the rental value?
• Have you sent an objection within 6 weeks, and can you document it?
• Have you notified Udbetaling Danmark if you receive boligstøtte?

When should you get help?

Contact a tenants’ association, a landlords’ association or a lawyer specialising in tenancy law if the increase is large, if you are unsure which rules the building follows, or if the tenancy is marked as substantially improved under § 19(2). The rules have many exceptions, and the outcome can depend on the specific building and lease. Huslejenævnet in your municipality can settle disputes, and the municipality can tell you whether it is regulated.

In short

• The rent can only go up if there is a basis for it in the lease or the law.
• Net price index adjustment requires an agreement in the lease, happens no more than once a year and is introduced with a written letter.
• Other increases generally require 3 months’ notice and must meet clear formal requirements, otherwise they are invalid.
• A regulated municipality and an older, larger building generally mean cost-based rent, where costs and not the market set the cap.
• As a tenant you typically have 6 weeks to object in writing. Do it in time, and keep paying.
• If you need to move because the rent is getting too high, you can find rental homes on Bolighub.

FAQ

How much can the rent go up each year?

There is no fixed percentage limit. With net price index adjustment, the increase follows the index, for example 3.0 percent from September 2025 to September 2026. Other increases depend on the building’s costs, the rental value or rising taxes. The 4 percent cap only applied to the adjustments for 2022 and 2023.

Does the landlord have to give 3 months’ notice of a net price index adjustment?

No. If the index adjustment is agreed in the lease, the landlord can introduce it with a written notification (lejeloven § 53(2)). Other increases, for example based on the rental value or higher taxes, require 3 months’ notice.

How do I know whether my municipality is regulated?

Most municipalities are regulated, but there is no single official list. Ask your municipality or Huslejenævnet. Remember that the building’s age and number of flats also determine which rules apply.

What happens if I don’t object within 6 weeks?

The increase can then generally take effect. You can still ask Huslejenævnet to assess whether the rent is higher than permitted, for example under the rules on cost-based rent or on reduction based on the rental value, but separate deadlines apply.

Can the landlord raise the rent during a non-terminable period?

Index adjustments and increases due to taxes and charges can generally be introduced. An increase based on the rental value requires the landlord to have reserved that right in the lease (§ 44(5)).

Is stepped rent legal?

Not in leases signed on or after 1 July 2015. In these, adjustments must follow the net price index. Older leases may contain a valid stepped rent clause.

Sources and further reading

• Retsinformation: Lejeloven, Act no. 341 of 22 March 2022 (in Danish), especially §§ 4-7, 19, 23, 26, 29-30, 37-38, 40, 42, 44-48 and 53-55
• Retsinformation: Act no. 1793 of 28 December 2023 amending lov om leje m.fl. (in Danish)
• Københavns Kommune: Lejemål med fri lejefastsættelse (tenancies with free rent setting, in Danish)
• Danmarks Statistik: Nettoprisindeks (net price index, in Danish)
• Borger.dk: Beboerklagenævn og huslejenævn (residents’ complaints boards and rent tribunals, in Danish)
• Borger.dk: Boligstøtte: Giv besked om ændringer (housing benefit: report changes, in Danish)
• Bolighub: rent figures from listings on Bolighub, calculated on 19 October 2026