Turnover for the six months to June 30 was steady at £1.42bn while pre-tax profits rose to £35.5m from £29.9m last time.
Margins at the Construction & Infrastructure division improved again to 2% from 1.7% as the company continued to be selective about projects it goes for.
Morgan Sindall also enjoyed an end of period net cash balance of £114m.
Chief Executive John Morgan said: “We have had a strong first half of the year and these results underline the significant operational and strategic progress being made across the Group.
“Our strong balance sheet including our net cash position is a significant differentiator for us, allowing us to make the right long-term decisions for the business, which best positions us in our markets for continued sustainable growth.
“There is much positive momentum across the Group and with our high quality, growing order book, we are excited by the opportunities ahead.”
The company added: “The current operational performance of Construction and the quality of its order book provides confidence that further progress towards its medium-term operating margin target of 2.5% will be made in the second half of the year and beyond. “