This paper examined various stages and advantages of wooden additional floors from the perspective of Finnish housing and real estate companies through interviews with professionals involved in these projects. Main findings highlighted: (1) commercial conditions should be carefully analyzed for return on investment; (2) city plan change and the presence of a potential contractor and an expert were generally considered important issues; (3) considerations regarding city planning, parking spaces, load-carrying capacity, and new building codes were highlighted as critical factors for feasibility study; (4) existing building regulations and building rights regarding the subscription fee and tax issues should be considered during project planning; (5) city plan change and building rights with different tendering conditions were reported as important parameters in implementation planning; (6) an efficient flow of information between the parties involved was vital to the successful progress of the construction phase. Wooden additional floor construction, which requires commitment, investment, and cooperation between interested parties, has great potential regarding construction technology and contracting mechanisms. Additionally, this sustainable approach has many advantages concerning the environment, economy, energy efficiency, and aesthetics. In this sense, it is believed that this study will contribute to the diffusion of wooden additional floor construction in other countries besides Finland.

This chapter examined the various stages and benefits of wooden extra stories from the perspective of Finnish housing and real estate companies through interviews with professionals involved in these projects. Key findings highlighted are as follows: (1) in the feasibility study, project planning primarily focuses on property condition and potential improvement targets as well as other considerations, for example, compliance with current regulations and parking arrangements; (2) in the project planning, application of extra stories is thoroughly examined, and construction costs, profits, and the sale of building rights are discussed; (3) in implementation planning, issues related to building rights, city plan change, and conditions of the company that manages the property play an important role; and (4) during construction, frequent information updates are made to residents regarding the site arrangements and the construction program. Wooden extra floor construction, which requires commitment, investment, and cooperation among the interested parties, has great potential in construction technology, contracting mechanisms, and ecological engineering solutions. It is believed that this chapter will increase the dissemination of wooden extra stories, thus contributing to the greater use of more sustainable materials in renovation projects and the ecologically sensitive engineering approaches to meet the challenges arising from climate change.