In territory of Latvia the origins of the regional architecture formation are related to wooden houses built by the Baltic tribes and the architectonic space arrangements on castle hills, as well as spatial solutions in the rural environment – in farmsteads where in the natural environment context, following peculiarities of the topography, near water basins the building-forms of residential and household buildings were arranged and the proportions of their separate constructive parts were looked for. Due to the environmental interaction created by nature and people, every region of Latvia – Kurzeme, Zemgale, Vidzeme and Latgale – over the centuries has acquired its own language of architecture forms typical for the particular region: their qualitative features are the scale and relations of spatial forms. Searches of the space and shape mutual impact and arrangement are also topical nowadays. Architects, following old traditions and preserving the human scale in environment, have created modern buildings in Latvia regions – complexes of residential and public buildings – and culture environment for daily activities. The interpretation of the building-forms formation and their separate parts, usage of natural building materials, also the searches of proportional relations of separate parts and details of buildings improve the language of architecture forms, awarding it new features. The goal of the research is to find out the significance of the qualitative features of architecture – relations of the scale and spatial forms – for the emotional artistic expression achievement in the modern regional architecture of Latvia.