Abstract This paper describes the present state of the project SNOW-SIM at Narvik Institute of Technology. The project is aimed at finding methods for simulations of wind and snowdrift around building construction. The purpose of this project is to develop an integrated planning environment suitable for determining wind loads and snow deposition in planning construction in the cold climate areas. Such problems are now mostly solved by using wind tunnel experiments, rough assumptions or by experience. Calculations in two and three dimensions are performed on commercial fluid dynamic software based on Navier-Stokes equations. This paper deals with wind loads on buildings, ventilation of the attic of a small house, and flow patterns around groups of buildings. The velocity is shown as a vector plot around the structures, and the wind pressure is given as characteristics pressure values on surfaces. Flow patterns around buildings are visualized by streamlines. Simulations of snow accumulations are done with a generalized drift-flux model which is described in the paper. Drifts around snow fences are simulated in two dimensions and compared with full-scale measurements. Three-dimensional snow deposition is calculated around a group of houses with snow deposition expressed as surfaces.