Warm, Wet, and Risky. The Threat of Massive Damage in Norway Is Growing

In a 2025 survey, over 50 percent of homeowners in Norway said that more violent, warmer, and wetter weather increases the risk of damage to residential buildings. Despite this, roughly the same number of people stated that they check their homes less than once a year, and some never do it at all.

Bjørg Agasøster, an architect and PhD candidate at the Oslo School of Architecture and Design (AHO), emphasizes the importance of regular inspection and maintenance. According to her, much of the damage can be limited if owners are aware of the effects of moisture and act early. Data from the Norwegian Climate Services Center show, among other things, an expected 15 percent increase in annual precipitation for Oslo and Akershus.

Agasøster points out that the situation varies by region. However, climate data indicate wetter and warmer conditions for buildings, as well as an increase in total rainfall and the number of rainy days. This changes the working conditions for structures. Buildings now have to withstand greater water loads than before.

Spring and the start of the wetter season are a good time to inspect your home. Winter may have left marks on the roof, facade, and wooden elements, and the damp season encourages the growth of rot-causing fungi. Inspection can be easier during rain, as leaks, water accumulation, and attic leaks are more visible.

It's best to start the inspection with the building's exterior shell. The outer wall should be able to dry, so vegetation should not block airflow near the facade. Moss and green algae on panels trap moisture. Soft wood under trims, cracks, bulges, and peeling paint may indicate a moisture problem.

On the roof, check the roofing felt, flashings, and tiles. Gutters and downspouts should direct water away from exterior walls and foundations, and leaves and debris from winter and spring should be removed. Pay special attention to areas around windows, doors, and vents, as these are more prone to moisture damage.

Inside the house, the basement is important. The characteristic basement smell may signal moisture problems, as can discoloration and changes in materials. The attic should also be checked. Roof and attic hatches must be tight, and new stains may indicate leaks or moisture intrusion.

Pipes and ducts from interior rooms should be routed above the roof. The chimney is a typical transition point where moisture damage can occur. Taking photos can help compare changes with previous inspections. Good ventilation and efficient exhausts ensure proper air exchange.

When inspecting your home, it's also worth checking pest protection. The first step is to look for openings through which rodents can enter. VIS Forsikring reminds that a mouse only needs a 6-millimeter gap to get into a building.