Boot said profit for the year to December 31 2014 is expected to be “comfortably ahead” of expectations.
The firm said 2015 had also started well particularly in plant, construction and its jointly owned house builder businesses.
Boot will confirm full-year results on March 26.
T Clarke also confirmed it was trading in line with expectations despite a “challenging” year closing out contracts let on low margins during the recession.
The building services specialist has boosted its forward order book to £300m thanks to the London construction boom.