What are the key features and benefits of an attefallshus?

An attefallshus is a small secondary house that can be built on a property in Sweden without a building permit. Key features include its small size, typically around 25 square meters, and its versatility as a guest house, home office, or rental property. Benefits include the ability to increase living space without a lengthy permit process, cost savings compared to traditional construction, and the potential for rental income.