Mortimer House is a Grade II listed building in the Brecon Beacons National Park local planning authority area, Wales. First listed on 1 February 1988. A Late Georgian House. 1 related planning application.
Mortimer House
- WRENN ID
- dim-joist-rook
- Grade
- II
- Local Planning Authority
- Brecon Beacons National Park
- Constituency
- Brecon, Radnor and Cwm Tawe MP: David Chadwick (LD)
- Country
- Wales
- Date first listed
- 1 February 1988
- Type
- House
- Address
- Mortimer House, 19 Castle Street, Hay, Powys, HR3 5DF
- OS grid reference
- SO 228 422
- Coordinates
- 52.0735, -3.12746
- Source
- Cadw listing
Description
Mortimer House is a late Georgian style building that stands three stories tall and features four bays. The front is made of coursed rubble with a rubble plinth. It has a slate roof with wide boarded eaves and a central blue brick chimney stack. The windows are small pane sash windows, with nine panes on the second floor and twelve panes below, all featuring voussoir lintels and weathered keystones. To the left, there is a boarded cellar opening, while the right side is corrugated. There are steps leading up to entrances at either end, each adorned with broad bracket hoods and reeded architraves, as well as panelled reveals and six-panel part glazed doors. The side elevations are also made of rubble, and there are small pane sash windows at the rear. Inside, the interior is plain and includes six-panel doors.
Local climate
Mortimer House receives an average of 900 mm of rain a year. This makes it wetter than 67% of listed buildings in the UK. Its exposure to wind-driven rain is lower than that of 54% of listed buildings.
It experiences an average of 52 freeze-thaw cycles a year, more than 93% of listed buildings. Of these, 29 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
Sign in or create a free account to unlock:
- Full EPC report — heating system, energy costs, size, glazing, construction etc.
- No sale records on file
- Related listed building consents — 1 application
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
Matched applications, energy data and sale records are assembled automatically and may contain errors. Flag incorrect data.
Similar buildings
The closest matches to this building from all 493,000 UK listed buildings, by architecture, period and materials.
this building 1 similar nearby listed buildings