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Knowledge Base
Historic Buildings Knowledge & Guidance
Caring for a historic building can be complex.
We share practical guidance to help owners make informed decisions.


Does internal plaster in a listed building need to be lime?
Owners of listed buildings often reach a point where internal plaster needs attention. Walls may have cracked, areas may sound hollow when tapped, or older plaster may simply have deteriorated with time. When repairs are planned, a very common question arises. Does internal plaster in a listed building have to be lime, or can modern plaster be used instead? In many cases the answer is that lime plaster is the most appropriate material . This is not simply a traditional prefer
Mar 46 min read


Does repointing need to use lime mortar?
Repointing is one of the most common repairs carried out on historic buildings. Brickwork and stonework inevitably weather over time, and the mortar between the masonry slowly erodes under the effects of rain, frost and wind. Eventually those joints need attention. When that moment comes, owners often ask a straightforward question: does repointing have to be done with lime mortar, or can modern cement mortar be used instead? For most heritage buildings the answer is clear. L
Mar 46 min read


Do heritage windows need to be repaired, or can they be replaced?
If you own a historic or listed building, the question of windows usually comes up sooner or later. Perhaps the paint is failing. Maybe a sash rattles in the wind. A pane has cracked, or a frame feels soft at the bottom where rain has worked its way in. At that point many owners wonder whether it would simply be easier to replace the windows altogether. In most heritage buildings the answer is straightforward: repair is normally expected, and replacement is usually the last r
Mar 46 min read


Repair vs Replace — What Conservation Officers Expect
Owning a historic building brings pride, responsibility and, at times, uncertainty. When repairs are needed, many owners wonder where the line sits between repairing what exists and replacing what has deteriorated. Understanding this distinction is central to working successfully with conservation officers — and to protecting the character and value of the building itself. Why repair is preferred Historic buildings are valued not simply for how they look, but for the material
Feb 273 min read
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