This paper presents the results of new tests conducted on built-up cold-formed steel section battened columns. The pin-ended columns were axially loaded and consisted of two cold-formed steel channels placed back-to-back at different center-to-center distances. The built-up columns had different geometries and different slenderness ratios. The column strengths, load-axial shortening, deformed shapes at failure, failure modes, load-lateral displacement and load-axial strain relationships were measured and observed in the tests. In overall, the experimental investigation aimed to provide sufficient test data for finite element models to be developed and to compensate the lack of test data on this form of construction. The test results have shown that the built-up cold-formed steel section battened columns offer a considerable increase in strength compared with single section columns provided that correct slenderness ratios were considered. It was also shown that the column slenderness and geometries have a considerable effect on the failure modes and load-displacement relationships. The columns strengths measured in the tests were compared with design strengths calculated using current codes of practice, with detailed discussions and conclusions.