The Hadwen House is a Greek Revival mansion built in 1845 by whaling merchant and silver retailer William Hadwen.

Hadwen purchased the property on the corner of Pleasant and Main in 1844, and commissioned local builder Frederick Brown Coleman, "an artisan who specialized in intricate carvings and designs for pillars," to construct the two-and-a-half storied clapboard house with a five-bayed façade, colossal pilasters, and a pedimented ionic portico.