The current shift towards a more productive construction industry and the growing significance of digital engineering has led to increased interest in additive manufacturing (AM) from both practicing engineers and researchers. However, it is unclear if the existing design codes are suitable for designing AM members, hence hindering their potential to be used in construction. The focus of most studies aiming to assess the structural performance of AM members lies predominantly in AM steel and AM stainless steel, with AM of aluminium receiving less attention, despite aluminium’s high corrosion resistance, aesthetics, and favourable strength to weight ratio. It is vital to comprehend the structural performance of aluminium produced through additive manufacturing and evaluate if the code for structural aluminium, the EN 1999-1-1, can be used for designing AM aluminium cross-sections. To address this gap in knowledge, this paper reports experimental tests on square and rectangular hollow sections (SHS/RHS) made from AlSi10Mg alloy and manufactured using selective laser melting (SLM), a sub technology within the family of powder bed fusion (PBF) manufacturing processes. Material coupon testing of samples manufactured at three specific orientations namely 0°, 45°, and 90° and geometric imperfection measurements are also reported. The tested AlSi10Mg cross-sections cover a wide range of cross-sectional slenderness thus allowing the effectiveness of the local buckling design guidelines provided in EN 1999-1-1 for additive manufactured AlSi10Mg sections to be evaluated.