A six-metre-high tower and low courtyard walls preserve the stone successor to Bridge of Weir’s earlier timber castle.
Quick facts
- Date
- Probably fifteenth century with later additions
- Architect / designer
- Built for the Knox family and later occupants
- Type
- Ruined medieval tower house, courtyard and ancillary ranges
- Designation
- Scheduled monument (SM4428)
- OS grid reference
- NS 38334 65177
Architecture, archaeology and continuing use
The square keep measures about seven metres externally, with thick rubble walls, dressed quoins, a slit window and a tall altered doorway. Low foundations reveal a later east wing, courtyard wall and parallel ranges that may have held stores or accommodation.
Its story
The Knox family acquired Ranfurly lands around 1440 and probably built the stone tower soon afterwards. The residence expanded around a courtyard, may later have served a working farm, and passed from the family in 1665.
Why it is included
Scheduling protects nationally important evidence for medieval defended residence, estate management and the transition from a nearby timber motte to stone castle.
What to notice
- The square keep surviving to about six metres.
- Foundations of the later east wing.
- Low ranges and courtyard boundaries around the tower.
Reading the surroundings
Do not cross an active golf course or private land without explicit permission. Keep away from play, never climb or lean on masonry, and do not dig, detect, move stones or remove material.
Timeline
- Around 1440 The Knox family acquired Ranfurly lands and probably established the stone tower.
- 15th–17th centuries Later wings and courtyard buildings enlarged the defended residence.
- 1665 The barony passed from the Knox family to the Earl of Dundonald.
- 2011 Rescheduling enlarged the protected area around the visible ruins.
What we know — and what remains uncertain
The functions of the low southern ranges and the exact date of each addition remain archaeological interpretations rather than documented certainties.
Sources & further reading
- Historic Environment Scotland: Ranfurly Castle, SM4428 — Current designation status, mapped location, date, fabric and architectural or archaeological interest.
- Trove designation: SM4428 — Parallel national record identity and archival context.
Location
OS grid reference NS 38334 65177 · Location confidence: High: the current national designation supplies an exact mapped National Grid Reference; public text separately states access and current-use uncertainty. · Select the marker to open its satellite view in Google Maps. On desktop, drag Pegman (the yellow figure) onto a blue road. On mobile, turn on the Street View layer and tap a blue road. Other photo markers may be user-contributed.
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