woodsmith
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It's not really possible to give you much of an idea on pricing I'm afraid as I can only give you a best guess, but if this is an old wall I would think there is a good chance it would have originally been pointed in lime rather than cement.
First you need to find out if the current pointing is cement or lime (lime tends to be softer with larger particles, cement mortar is hard and sandy if it will break up at all)
Then dig out some of the pointing and see if the mortar is cement or lime based (again, lime mortar is coarse grained and may have small lumps of white lime in it).
Cement pointing lime mortar is a bad idea but some builders still do it and some think adding lime to cement mortar makes it lime mortar, but it doesn't, lime mortar is made by mixing NHL lime (or alternatively lime putty) with sharp sand with absolutely no cement added to the mix.
Repointing stone is a time consuming task and as a very rough guide it will probably cost you upwards of £50 per square metre.
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