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.
A more selective approach to new business is paying off and CEO Tony Lenehan said the firm is confident it will “deliver double digit growth in the forthcoming year.”
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.”