Denbigh received its first borough charter in 1290, while the town was still confined within its medieval walls, and its civic and commercial life has been anchored around the High Street and Crown Lane ever since.
In 1572 Robert Dudley, Earl of Leicester, built a new Shire Hall in the town, combining an open, colonnaded market hall at ground level with a council chamber and justice room above — a building that housed both trade and the administration of law under one roof. It was remodelled in the 1780s with a new roof and elegant Venetian windows, and its ground-floor colonnades were later enclosed. The building survives today, now serving as Denbigh's public library.
As the town's market outgrew the old Shire Hall, a purpose-built Market Hall designed by Thomas Fulljames — the same architect responsible for the North Wales Hospital — opened in 1848. That building was itself later replaced following an open architectural competition in 1910, won by a design from C. E. Elcock, although opposition from ratepayers meant the winning scheme was never fully carried out. Historically, market stalls ran the full length of the town centre, from Henllan Street through Bridge Street and High Street down to the bottom of Vale Street — a route that still forms the commercial heart of Denbigh today.
The Earl of Leicester's 1572 Shire Hall on Hall Square was built to serve as market hall, town hall and courthouse in one, reflecting the concentration of civic life in a single building typical of Tudor market towns. It stood at the heart of Denbigh's commercial and administrative life for more than two and a half centuries before Victorian rebuilding replaced it with a succession of market halls better suited to a growing 19th-century economy.
The final Victorian market hall building on the site was later converted for use as Denbigh's public library, a role it still performs today, meaning the location has served the town's civic and public life in one form or another for well over 400 years — a rare continuity for any building in Wales.