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I'm having to install a mister in my house so I can remove a wall and a fire door
We just didn't bother doing this. When we sell we'll put in back in if the buyer wants, but plan A will be persuading them that it's much better without (which it is).
There are plenty of exits so it doesn't worry us.
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Didn't see this post.
Around ours, it appears to be common for building control to sign off on spec of mist systems, rather than the actual install.
Worth having a chat with people around you that have had conversions done.
(I may haver spent a few weeks just knocking on doors and being shown around complete strangers' houses.)
Not that I am suggesting you do get sign off and forget about the install.
I'm having to install a mister in my house so I can remove a wall and a fire door