New construction law leaves Finnish municipalities confused over permit requirements

A 2025 reform to Finland’s building regulations has created uncertainty, with local authorities interpreting rules differently on whether small outbuildings and attached structures require permits, Yle reports.

The law exempts structures under 30 m² (such as saunas and sheds) and canopies under 50 m² from permits. However, municipalities now disagree on whether covered terraces attached to buildings should count toward the total area. Some require permits for combined structures exceeding limits, while others do not.

Paula Mäenpää, development manager at the Association of Finnish Municipalities, said the ambiguity has led to inconsistent rulings. “In many municipalities, a 29 m² building with a 49 m² canopy has been deemed permit-free,” she noted, adding that legal clarity may take years as cases reach administrative courts.

The Ministry of the Environment, which oversees construction regulations, acknowledged the lack of precise guidelines. Official Mikko Koskela confirmed no strict rules exist for how physical connections between buildings and canopies affect permit assessments.

A complaint to the Parliamentary Ombudsman over a 24 m² sauna with a 12 m² terrace—ruled as a 36 m² permit-requiring structure—failed to resolve the issue. The Deputy Ombudsman stated that without established case law, municipalities must make independent judgments, subject to appeal.

The confusion affects thousands of annual projects. In 2021, nearly 18,000 permits were issued for saunas and outbuildings alone.