Maynard-based JM Coull has begun cleanroom construction and façade improvements for ASML’s office in Wilton, Conn.

ASML is a Dutch company that provides lithography systems for the semiconductor industry.

JM Coull is working with Connecticut-based H&R Design to build a 4,500-square-foot EUV test cleanroom, an addition to the south side of ASML’s facility, as well as replace the building’s façade. The construction will take place over a 10-month period. The office will operate as normal throughout the construction.