||Second homes (SH) are a major form of domestic tourism in many countries, especially the Nordic countries. Nearly 50% of Norways population have access to at least one SH. Over the last 20-30 years, the average SH size has increased significantly (62.2 m2 in 1983 to 96.2 m2 in 2019) and a typical SH now holds very high material standard. Moreover, four times as many SHs were built in 2019 compared to 1983 (6455 versus 1600). In this period, the majority of the second home growth in Norway has taken place in the rural mountain areas (Skjeggedal et al. 2016), placing these areas under a multitude of interrelated pressures; Buildings and activities place local nature and biodiversity under pressure, but in addition the modern SHD trend also places pressure on the host-visitor relationships and land management systems, as well as altering local economies.Compared to other forms of recreation and tourism, Second home developments (SHD) poses particular challenges. SH owners are tourists, and exert similar impact on hosting communities, however, the dwelling use (Paris, 2014) of SHs, characterized by extended and repeated visits, sometimes spanning generations, implies different social, economic and ecological impacts than from other forms of tourism. Covering 39% of the total Norwegian area and 70% of Norways protected land, mountain municipalities are facing negative population trends, decreasing economic opportunities in the traditional industries and low accessibility to important public services. Since the 1990s rural areas have increasingly been portrayed as arenas for post-productivist amenity and leisure production for a growing urban population (Perkins 2006; Overvåg 2010; Rønningen & Flemsæter 2016). With widespread second home developments, intensive tourism developments, and other recreational use, new actors are claiming a stake in the outfields and in local governance (Overvåg et al. 2016). Existing research tends not to have dealt holistically with SH pressures. Despite a growing literature on the challenges mountain communities face (e.g. Arnesen et al. 2010) and the commodifications of rural resources (Perkins 2006, Rønningen & Flemsæter 2016), descriptions and analyses of local inhabitants and SH owners land use practices, experiences and meanings are still scarce. Without a better understanding of the increasing and transforming SH developments and its competing interests, values and practices, the pressures related to SH is likely to intensify, leading to conflicts and hampering ecological as well as economic and social sustainability.As the SH transforms to year-round use and even as a primary residence, the changed and increased recreational practices have put pressure on ecosystems (e.g. wild reindeer habitats), sheep and reindeer herding practices and local nature practices such as hunting and berry picking (e.g. Arnesen et al. 2019). Thus, recent SHD has increased tensions between nature users and nature conservationists and between hosts carrying out traditional local practices and visitors challenging these. While an array of branding and visitation strategies, initiated by national government, are being developed in protected areas throughout Norway, there is a lack of national policies and institutional support for SH management in local communities surrounding protected areas. While protected areas area managed by the State, SH planning lies within the realm of local government. Local authorities are thus in a strong position to guide development, however, asHall and Müller (2004) points out, it can also result in a lack of regional and national consistency in planning guidelines. The double challenge local councils face; few formal tools for visitation regulations outside protected areas, and the distinctive impacts from dwelling SH users, highlights the need for transgressing the current focus on building regulation, to a wider comprehensive planning for social sustainability in addition to economical and ecological sustainability. We therefore look at how SH are incorporated into the strategic planning process at local and regional levels, in ensuring sustainable development of SH in a broad sense. To better understand the degree and implications of these tensions and pressures, there is need to take a bottom-up perspective, looking at the SHD phenomenon by investigating different groups of peoples nature-based practices, their values and expressed attitudes and meanings, to further develop insights of relevance to local as well as national decision-making processes enabling a more sustainable second home development.