§ 129
For work that results in energy savings for tenants in the property, the landlord may demand a rent increase based on the total expenses reasonably incurred, but not exceeding the savings the work provides to the tenants.
Stk. 2.If the landlord has carried out work under the rule in § 146, the landlord may demand a rent increase that provides an appropriate return on the expenses reasonably incurred and covers depreciation and usual expenses for maintenance, administration, insurance, and similar.
Stk. 3.If the landlord has undertaken measures under the previously applicable law on private urban renewal, cf. Act No. 49 of February 1, 1996 with subsequent amendments, or under Chapter 5 of the previously applicable law on urban renewal, cf. Act No. 260 of April 7, 2003, the landlord may, instead of a rent increase for improvements under § 128, demand a rent increase calculated and implemented according to the rules in the previously applicable law on private urban renewal or in Chapter 5 of the previously applicable law on urban renewal.
Stk. 4.If a property has central heating or hot water installation, and the landlord connects this to a collective heat supply system, the landlord may demand that the tenant reimburse the landlord for the property's conversion expenses over 10 years, deducting the savings.
Stk. 5.The Minister of the Interior and Housing lays down detailed rules for subsection 1 on requirements for documentation, conditions for demanding a rent increase, and the calculation of the increase.