Turnover was up 7% to £241m. The company credited the rise to a restructuring programme, which was overseen by chief executive Philip Cleaver, who took over in October.
The company said this had focused efforts on the development of its national partnering programme and on social housing and commercial fit-out operations.
Cleaver said: "This diversity of workload should protect us from any slowdown that may emerge in the sector."
He also said Mansell's forward order book stands at a record £900m, of which £700m comes from the firm's partnering scheme.
The company has established relationships with organisations such as BT and Orange, where business remains brisk, despite recent industry concerns over the roll-out of mobile internet networks.