While travelling on the Åland islands, I noticed that a lot of houses have ladders reaching from under the windows to a meter or 2 from the ground. I had seen similar ladders on the sides of houses in the rest of Sweden, but they stretched until the roof to make it easier to de-snow during the winter ; the ones on Åland are shorter. The only explanation that I can think of is that the ladders would make it easier to evacuate in case of a fire, but then why are they only on the houses of Åland?
The premise of your question is mistaken. Åland islands are a part of Finland, not Sweden so therefore the Finnish fire regulations are in effect. According to the Finnish fire regulations (link in Finnish) if the window is more than 3.5 meters from the ground the ladders are needed. You can see these ladders all over Finland.