The Freemasons Hall

The Freemasons' Hall, located at 42 Castle Street, is a late 18th-century building that stands two stories tall. It is constructed of red brick resting on a chamfered plinth. The building features a brick dentil eaves cornice that encircles a pediment over three slightly projecting central bays. The roof is covered with old tiles.

On the first floor, there are five arched windows with radiating glazing, while the ground floor has five heavily barred windows and a six-panel flush door situated in the left-hand corner. This door is set within a recessed opening that is framed by narrow pilasters on tall moulded bases, with an entablature that breaks forward over the pilasters and a pediment above. There was formerly an early 19th-century lamp above the door.

The north-west front of the building features a fine round-headed entrance, which is now blocked. This entrance is flanked by brick pilasters with heavy stone impost blocks, and it has a round-headed arch made of rubbed brick above, with a triple keystone of stone. Above this, on the first floor, is a square blind panel.

The Freemasons' Hall is part of a group of listed buildings that includes Nos 1 to 9 (consecutive) Lowndes Buildings on the west side of Castle Street.