Garthmyl Hall is a Grade II listed house in Berriew, in the historic county of Montgomeryshire, now Powys.

Garthmyl Hall is to the south of Berriew, overlooking the Severn valley and set back from the A 483 Welshpool to Newtown Road.

Many sources say that an earlier house was re-modelled for their occupation[5] but there does not appear to be any surviving evidence for this and the present Garthmyl Hall must represent a completely new building.

[8] The hall was bought in October 2015 by the Pugh family, renovated extensively, and opened in April 2016 as a wedding venue.

He also built the Castellated Gothic Ashwicke Hall in Gloucestershire for the Liverpool attorney John Orred 1857–60[11] Colling was given a free hand by the wealthy John Naylor when building Garthmyl Hall, as seen by the use of lavish gilding and plasterwork for ceiling decoration, and for the ornamental terracotta on the exterior.

[12] The centre bay projects slightly, emphasised on the ground floor with a four-column Tuscan porch, and above by a pediment that is set with a terracotta coat of arms of the Gold and Naylor families with the motto Trust in God.

[14] The brick Stable block, which has an entrance range with a central pediment over a lunette and surmounted by a cupola, is likely to be earlier than the main house.