Lower Garth (also known as Garth Isaf) is a Grade II* listed building in the Powys local planning authority area, Wales. First listed on 25 April 1950. A Georgian House.

Lower Garth (also known as Garth Isaf)

WRENN ID
grey-copper-merlin
Grade
II*
Local Planning Authority
Powys
Constituency
Montgomeryshire and Glyndwr MP: Steve Witherden (Lab)
Country
Wales
Date first listed
25 April 1950
Type
House
Period
Georgian
Address
Lower Garth (also known as Garth Isaf), Guilsfield
OS grid reference
SJ 217 101
Coordinates
52.68343, -3.15875
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

Lower Garth, also known as Garth Isaf, is a Grade II* listed building that features a timber frame and a random slate roof from Llangynog. It stands two storeys high with attics and likely originated as a four-bay structure with a Type C lobby entry plan. The fourth bay is a narrow framed cross wing at the southern end, which may have originally served as a porch. A two-room cross wing was added to the northern end in the mid-18th century, probably by the Tudor family, and the building was widened to create a circulation corridor.

The exterior showcases small square panel framing, with some plaster infilling and a decorated margin surviving at the rear, while the southern wing features close studding with a middle rail. The building has three gables: one at the northern end, one over the central porch, and one over the southern bay, with the northern addition providing a half-hipped element. At the rear, there is a central gabled wing and a large 19th-century lean-to at the southern end. The northern wing has 12-paned sash windows with heavy glazing bars.

Inside, the main living room at the southern end boasts 17th and 18th-century panelling, highlighted by a fine Jacobean overmantle above the fireplace located in the corner of the rear wall. The fireplace at the opposite end of the same room is adorned with 18th-century English delft tiles. An early 18th-century staircase made of mahogany or walnut features a deep wreathed handrail and moulded stick balusters set diagonally. The roof consists of four bays with collars and a double tier of purlins. The Georgian wing includes corner fireplaces and reeded ceiling beams, also featuring a double purlin roof.

At the time of inspection in November 1994, the building was undergoing restoration.

Local climate

Lower Garth (also known as Garth Isaf) receives an average of 870 mm of rain a year. This makes it wetter than 64% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 50% of listed buildings.

It experiences an average of 40 freeze-thaw cycles a year, more than 77% of listed buildings. Of these, 20 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

More on this building

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  2. Brook House Farmhouse Grade II 360 m
  3. Brooklands Hall (School and Golf Academy) Grade II 449 m
  4. Walled Garden at Garth Farm and Heylin Farm Grade II 714 m
  5. Farm Buildings at Garth Farm and Heylin Farm Grade II 982 m
  6. Lower Trelydan Farmhouse Grade II 998 m
  7. Gates and Gate Piers at the former E entrance to Garth Grade II 1.1 km
  8. The Porches Grade II 1.4 km
  9. Glebe House Grade II 1.4 km
  10. Porches Grade II 1.4 km