Ground Control said it would continue to develop its business in the commercial market, serving retailers and utility firms, and hoped the combined turnover would hit £35m.
Vale Contract Services will see the founders - managing director Andrew Spink and finance director Tania Spink - continue in their roles. There will no job loses, Andrew insisted.
The company holds contracts in the North West and the Midlands and has a landscape-construction division, also in the North West.
Andrew Spink said: "We will be able to share expertise and best practice and take advantage of the synergies that can be achieved by such a venture."
Ground Control managing director Simon Morrish added: "We've enjoyed strong growth over the past six years and have a 99.2 per cent annual client site retention rate."