Article 7:243 Dutch Civil Code, Book 7

Paragraph 1

If residential accommodation in a built immovable thing requires facilities as referred to in paragraph 2, the court may, on application by the tenant, determine that the landlord is obliged to make this improvement at its own expense, provided that the tenant has declared his or her willingness to pay a rent increase that is reasonably proportionate to these costs. No derogation may be made from this provision to the detriment of the tenant.

Paragraph 2

Facilities as referred to in paragraph 1 are:

1. the thermal insulation of the external partition structures;

2. the thermal insulation of the structure forming the partition with the crawl space;

3. the installation, for the heating system, of a boiler with a generation efficiency of at least 80%, if the existing boiler is at least ten years old.