Am I daft, or is it ridiculous for a buyer to expect to do works to a house they intend to buy from you before they actually purchase it?
We've had no end of issues with this buyer and they are complete CFs. Their new issue is that they want to do some work on the roof (not necessary works, just something they want done) before they will complete and are expecting us to continue to wait for them (paying for mortgage, bills etc for a house we don't live in plus increasing storage costs as they were supposed to complete before lockdown) until they have the house just as they want it.
As I see it, they should complete on the house and if they decide they can't move in until this work is done, they should stay in their rental property until they see fit to move. There is no reason to delay in my mind.
Surely there are issues around insurance as we haven't agreed these works and if the contractor causes damage, we could be left to pay for it. Someone would need to be there for up to a week while the work is being done, we are working full time and the buyer can't be there as they don't own the property (plus we don't want them there due to previous CF problems such as trying to force entry to the house because 'it's theirs' 
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The estate agent seems to think it's common practice to let folks do work on houses they don't own whereas we really don't think it is. It seems too risky and in theory we could let them pay for the work and then pull out of the sale so why would they want to risk it either?