The foundation stone for the new building was laid by Charles Packe in October 1854: it was designed by the Northampton-born architect William Slater in the Italianate style, built in ashlar stone and was completed in 1855. The design involved a symmetrical main frontage with nine bays facing onto the Market Place; the central section of three bays, which slightly projected forward, featured a round headed doorway with a fanlight flanked by two rounded headed sash windows separated by Doric order columns supporting an entablature and a balcony. On the first floor there were round headed sash windows separated by Ionic order columns supporting an entablature and a cornice and, at roof level, there was a two stage decorative bellcote.
The new building's foundation stone was laid in 1854 by Charles Packe, designed by William Slater, an architect from Northampton who created it in the Italianate style using ashlar stone and completed in 1855. The design involved a symmetrical facade with nine bays facing Market Place; the central section of three bays, which slightly projected forward, featured a round-headed doorway with a fanlight flanked by two rounded-headed sash windows separated by Doric order columns supporting an entablature and a balcony. On the first floor, there were round-headed sash windows separated by Ionic order columns supporting an entablature and a cornice, while at roof level, a two-stage decorative bellcote stood out.