North Midland Construction made a loss of £6.2m from its building and civils arm in 2014 because of cost over-runs on two of its major projects.
The losses contributed to the firm making an overall loss for the second year in succession.
However, North Midland’s overall operating loss of £2.8m was an improvement on last year’s figure of £5.9m.
Turnover at the firm grew by 9%, from £177.6m in 2013 to £193.2m.
In a statement, North Midland said it would divide its civils and building divisions into two separate entities, with the latter to be managed by a newly recruited team.
It said: “The underlying performance of both the civils and building elements were profitable and the new strategy adopted has been successful, with a high level of repeat business being secured with existing blue-chip clients and a major student accommodation scheme in Leicester recently being awarded to the building division.”
North Midland has a secured order book of around £155m for the current year, which it said represented a “significant proportion” of its 2015 budget.