The patent slipway at Underfall Yard in Bristol Harbour can lift out vessels up to 32m (105 ft) long and 8m (25ft) wide, and up to 180 tonnes dead weight. Boats can be taken out for a quick inspection or anti-fouling or for longer periods for major repair or alteration. Multihulls can be lifted out fully rigged. Narrow Boats can be accommodated either singly or in pairs.

There has been a slipway at the yard since the 1850s and the current design was installed by Docks Engineer John Ward Girdlestone in the late 1880’s. It was subject to extensive restoration in early 2022.