Gjengs leie
Gjengs leie (prevailing rent) is an average of the rent paid in ongoing tenancies for similar dwellings on similar terms in the same area. The term is central to Norwegian tenancy law because it is gjengs leie, not market rent, that a landlord can require the rent to be adjusted to once a tenancy has run for some time. The difference between the two matters: gjengs leie is usually lower than market rent, because it also captures older contracts that have not been adjusted to today's level.
Gjengs leie is regulated in husleieloven § 4-3, the Norwegian Tenancy Act. Once a tenancy has lasted at least two years and six months with no change other than ordinary index adjustment, either party can require the rent to be set to gjengs leie. The adjustment takes effect after a notice period, and the rent is set to what is prevailing for similar premises let on similar terms. The point of the arrangement is to provide a middle course: the landlord is not tied to a rent that has become too low over time, while the tenant is protected against a sudden jump up to full market rent.
The distinction from market rent is the most practical one to keep track of. Market rent is what a dwelling can achieve if let anew today, that is, the price for a completely new contract. Gjengs leie is the average of what is actually paid in existing tenancies, including contracts that are a few years old. In a rising rental market, gjengs leie will therefore lag behind market rent, while the two sit closer together in a flat market. When entering into a completely new tenancy agreement, the parties are free to agree market rent; gjengs leie only becomes the relevant figure when an ongoing tenancy is adjusted.
Setting gjengs leie in practice calls for judgement, because it must be based on an average of comparable tenancies. In disputes, the rent can be set by a rent assessment tribunal (takstnemnd), which reviews documentation of comparable tenancies in the area. For the landlord, gjengs leie is a tool for gradually moving a let dwelling towards a more accurate level without terminating the tenancy, while for the tenant it is protection against the rent suddenly being set at the top of the market. The rules apply to residential property; for commercial leases, the parties are far freer to agree adjustment mechanisms themselves.
In Placepoint you can look into rent levels and comparable properties in an area, which is useful both when assessing market rent for a new letting and when forming a picture of what is a reasonable prevailing level in an ongoing tenancy.
From Placepoint's dictionary: Gjengs leie
More information: Husleieloven § 4-3, Store norske leksikon: husleie
English: Prevailing rent (gjengs leie; the average rent in ongoing tenancies for comparable dwellings, a Norwegian-specific rent-adjustment concept distinct from market rent).



