Director Jerome Losson said the firm saw this group as the ideal first users of the portal as they were likely to make use of the whole range of services on offer.
The set-up aims to sell materials as well as offering procurement and project management tools online – its investors include materials giants RMC, Aggregate Industries, BPB, Pilkington as well as contractor Alfred McAlpine.
Mercadium claims that it can sell materials 5-10% below their usual price. It was launched in May and expects to go live next year.