 In 1820 Harrison designed Watergate House on a corner site in Watergate Street , Chester ; it is one of the largest private houses in the town . The entrance to the house is on the corner , leading to a circular lobby and a square entrance hall , which is top @-@ lit by a dome with a lantern . Harrison 's last commission for a country house in Cheshire was his design for Tilstone Lodge near the village of Tilstone Fearnall ; this has a porte @-@ cochère supported by four Doric columns . At about this time Harrison was also designing alterations to the east wing of Chirk Castle in North Wales . In late 1821 he was commissioned to work on Hardwick Grange near Hadnall in Shropshire for Rowland Hill , 1st Viscount Hill , which involved alterations to the front of the house , and the addition of a new dining @-@ room . At the request of the owner , this was in Gothic style ; the house has since been demolished . In 1822 – 23 Harrison built a house for himself , St Martin 's Lodge in Nicholas Street , Chester , which consists of a simple villa . His last work for a private client was again for Roland Hill , a building called the Citadel in Hawkstone Park , Shropshire . It was built as a dower house for his mother , and has the appearance of a small castle , with three circular battlemented towers . 
