Avon House is a Grade II listed building in the Bath and North East Somerset local planning authority area, England. First listed on 23 December 1974. House, offices.

Avon House

WRENN ID
salt-spandrel-dew
Grade
II
Local Planning Authority
Bath and North East Somerset
Constituency
North East Somerset and Hanham MP: Dan Norris (Ind)
Country
England
Date first listed
23 December 1974
Type
House, offices
Address
Avon House, Avon Mill Lane, Keynsham
OS grid reference
ST 658 687
Coordinates
51.41718, -2.4925
Source
Historic England listing

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

Description

Avon House is a house that has been converted into offices. It was built in the late 18th century, with some early 19th-century additions, and was restored in 1985. The building features squared and coursed rubble in the basement, with a rendered exterior and ashlar dressings, including an ashlar east bay. The roof is hipped and covered with slate, and there are mid-roof ashlar stacks, along with a wrought-iron gate.

The house is two stories tall with a basement and has five window ranges. The north facade facing the road has an irregular arrangement of windows, including two 2-storey, 3-light canted bays with plate-glass sashes. The central bay has wooden frames, while the eastern bay has plain ashlar reveals with sills. There is a single-light plate-glass sash on the first floor between the bays, and additional plate-glass sashes under segmental heads on each floor to the east. The outer bay is set back and features a ground-floor sash.

A tall, narrow, arched basement doorway with a wrought-iron gate is located between the bays, along with segmental-headed openings in the north outer bay at the basement level, which include a plank door and another opening to the east of the east bay. Steps lead up to the doorway, which has an ashlar surround and a segmental head on the east return. Above the 18th-century range, there is a cupola on a square rendered base, supported by wooden Doric corner columns with a coved top and topped with a weathervane. The eastern, set-back range includes garage openings at the basement level and segmental-headed windows with plate-glass sashes on the floor above.

Inside, there are no remaining features from the original room layout or any notable architectural details. Although the building has been significantly altered from its 18th-century state, it is part of a group with the industrial complex of the Old Brass Mill and Brass Mill Cottages located across the road to the north.

Local climate

Avon House receives an average of 860 mm of rain a year. This makes it wetter than 61% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 66% of listed buildings.

It experiences an average of 34 freeze-thaw cycles a year, more than 52% of listed buildings. Of these, 15 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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Nearby listed buildings

  1. Avon Mill Lane Bridge (MLN111350) Grade II 36 m
  2. Brass Mill Cottages Grade II 50 m
  3. Old Brass Mill Grade II 68 m
  4. River Chew Bridge (MNL111354) Grade II 127 m
  5. Ile D'Avon Club Grade II 212 m
  6. Causeway and Lockbridge North East of Ile D'Avon Grade II 216 m
  7. Keynsham Abbey Pier Base in the Garden of Number 3 (Number 3 Not Included) Grade I 249 m
  8. Archway on Street at the Entrance to Park House (Park House Not Included) Grade II* 348 m
  9. 20 and 22, Avon Road Grade II 362 m
  10. Precinct wall to Keynsham Abbey Grade II 396 m