Braintree’s Integrated Builders, a construction management, design-build and general contracting firm, has been awarded a 22,000-square-foot interior fit-up contract at 300 Apollo Drive in Chelmsford.

The renovated space will be occupied by MRV Communications Inc., which provides packet switching, packet optical (P-OTS), physical layer and out-of-band networking equipment, services and optical components for high-speed carrier and enterprise networks and specialized aerospace, defense and other communications networks.

Integrated Builders, which was hired by the landlord, Chelmsford Associates LLC, will provide a full tenant fit-up services in the existing building including drywall, ACT, flooring, millwork, glazing, sprinkler system and HVAC. Integrated Builders will also install supplemental cooling, lighting and power feeds.

"We’re very excited to have been selected again by owner for their fit-up project at 300 Apollo Drive," said Jay Dacey, president of Integrated Builders. "We’re looking forward to a timely and successful completion of the project on a site we are intimately familiar with."

Integrated Builders will work in collaboration with Boston-based architectural design firm Spagnolo Gisness & Assoc.