The business, which generates annual turnover of £47m, appointed administrators from Leonard Curtis on December 22, bringing an end to its 55-year trading history.
Leonard Curtis had been advising the group since last month as it sought a buyer following a difficult period for the company.
The agreed sale to manufacturing conglomerate GCH Corporation Ltd will safeguard 200 jobs
Cassie Hutchings, CEO of GCH Corporation, said: “Thurston is a respected UK manufacturer of modular buildings with a strong heritage and deep sector expertise.
“As a long-term, privately owned industrial group, GCH is committed to stabilising and investing in the business. We are excited to welcome Thurston into the GCH family and look forward to supporting its next phase of growth.”
Administrator Hilary Pascoe added: “We are delighted to have completed a sale and wish the new owners every success.”