Purpose: This study aims to identify three different types of house foundation. These house foundations are so called full basement foundation, crawlspace foundation and concrete slab foundation. When beginning a new construction, no matter if the house is small or large, there are many decisions that must be made. Including which foundation method is most suitable for the existing area. The house foundation must be able to stand firm for many years to come without suffering problems such as cracks and frost heave. It is important to choose at an early stage the foundation method that is most cost-effective and the ability to minimize the risks of frost heave. Method: The work is built up of two different methods; a literature study and a case study which contains several interviews with construction officials in Västerås region. Results: shows that concrete slab foundation is the primary construction that is chosen when choosing a house foundation for a new project aiming to build multiple single-family houses in Barkarö in Västerås city. All representatives decided that this construction has many advantages compared to the other house foundation methods, such as basement foundation and crawl space. It is the most proven basic method for this new construction of single-family houses. Conclusion: The conclusion of the thesis is that many of the representatives which works in the construction area choose concrete slab over other house foundations when there is no requirement for a specific house foundation from the customer.