Penhow Castle is an 11th Century Grade II* listed building in South Wales. We surveyed this wonderful old building back in the early 2000’s. It had previously been repaired and restored in the 1970’s long before the lime revival. Unfortunately modern materials had been used throughout; this prevented the building from breathing as originally intended and there were many defects as a direct result. Whilst the previous repairs were carried out with the best of intentions, the building was in need of extensive masonry and render repairs using lime.