Each additive manufactured (AM) component acquires specific topographical, microstructural and mechanical surface properties depending on the variation of several simultaneous AM processing parameters. Most of studies focus on a specific, narrow range and set of AM parameter variations, thus the surface and subsurface characteristics are typically understood in that limited conditions. However, there is still a lack of understanding of combined effect of several AM parameters on the functional properties of surfaces and their subsurface region. This affects the (in)ability to optimize these properties for the functional optimization of AM parts and the energy consumption through the AM process modification. This work is thus focused on the systematic variation of two key AM parameters in their full range by using a well-established commercial AM device. The laser scanning speed (500-1700 mm/s) and laser power (250–370 W) were used. We analyze and discuss how these two parameters affect surface topography, roughness, porosity, microstructure and hardness, as well as their anisotropy for top and side surfaces in selective laser melting (SLM) using a single AM machine and printing strategy. The aluminum alloy AlSi10Mg was used in this work, which is one of the most commonly used materials in die casting and has a huge potential to take advantage of additive manufacturing (AM) technology since these parts need to be lightweight and have good mechanical properties with specific complex shapes.