Harris, who will report to the managing director Mark Devlin, will oversee the field teams which include the overall responsibility for the operational efficiency of the surveying workforce.
As a qualified chartered surveyor Harris has 32 years experience with 22 years experience at Lloyds Banking Group.
Cumber will take responsibility for all commercial aspects of Colleys and joins the business with more than 15 years experience also with a LBG background.
His most recent position was regional manager for Halifax Intermediaries.
Devlin said: “Matthew and Les bring a wealth of experience to these new roles and will be using their expertise to strengthen our business.
"I'm keen to ensure that we continue to build on the fantastic progress we've made in recent years to explore new ventures and opportunities and Matthew and Les will play an important role as we drive the business forward."
