The scheme was granted planning approval by Swindon Borough Council last night and the Enquirer understands Bowmer & Kirkland, McLaren Construction and VolkerFitzpatrick are on the shortlist.
One contractor who missed out said: “The bidders are down to three and a winner should be chosen within the next few weeks.
“All three of the firms have worked with Gazeley before so they have good track records on jobs like this.”
At 800,000 sq ft, the building will be the size of around 20 football pitches and is the biggest building judged by footprint to go up in the area.
Gazeley project chief, Nigel Godfrey said: “We are delighted with Swindon Borough Council’s decision to approve the planning application.
“We look forward to starting on site in the autumn and will complete the facility by next summer.
“As well as reducing the environmental impact of the development, Gazeley has sought to ensure that the building will deliver significant annual operating cost savings for B&Q through reduced energy consumption.”
The new centre will be up and running in just over a year and will be fully operational by January 2012.
It is the first building deal to go-ahead for the developer at the G Park site on the outskirts of Swindon.
VolkerFitzpatrick’s most recent job for Gazeley was fitting out a Morrisons warehouse in Kent while McLaren built Gazeley’s Blue Planet centre near Stoke and Bowmer & Kirkland is on site in Daventry building the firm’s £38m distribution centre for Butcher’s Pet Care.