Figures show the firm boosted underlying pre-tax profits to £3.2m in the year to December 31 2015 from £2.1m last time as revenue rose to £115m from £97m.
Gross margins were also up to 9.3% from 8.4% last time.
Contracts won during 2015 included the £17.7m refurbishment of Westminster House for Aviva Investors and a £15m a year deal with the TSB to refit its branches over a five year period.
Chief executive Tony Lenehan said: “The group has built on a strong prior year performance and delivered double digit growth in both revenue and profit during 2015 as well as an improvement in gross margin. This is a further positive endorsement of a clearly defined strategy promoting diversification and a selective approach to new business opportunities.
“The successful refinancing transaction carried out in June 2015, combined with improved trading performance, has significantly strengthened the group’s balance sheet. Our order book remains robust and provides the board with confidence in the group’s ability to deliver double digit growth in the forthcoming year, in line with management expectations.”
The company said: “A shortage of new office space and a need for operational efficiency continues to drive refurbishment and fit-out opportunities in the UK.”