Fireplace renovation

Hello all,
I am toying with the idea of restoring a couple of old fireplaces in the period property that I own with a view to improving the resale value of the property and am wondering whether anyone has performed a cost benefit analysis of such a project. The reason for asking is that the agents I have has round are not convinced that the work I put in will translate into profit as obviously the cost of DIY restoration will be high. Currently the fireplaces are boarded up and plastered over and I only really want to perform the work if it will be worth my while?
Any thoughts/opinions about this would be appreciated.
Thanks in advance.
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How much an hour do you want to charge yourself? Essentially a labour of love I would have thought
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