In our last house we had a massive extension which doubled the footprint of the house. It was horrendous, we spent most of the budget on groundwork because there was some suggestion of movement, so we had to go and beg for more.
Then the builder disappeared, and we learned he’d gone bankrupt.
We had to hurriedly employ more builders, and although they were nice enough, they were useless, practically everything they did we had to have done again.
We got there eventually, but the cost had spiralled.
One thing we were sure of, was that we would never build another extension, fast forward, see this house, love it but it’s too small, so off we go again, but a lot of lessons had been learned.
We are having another single story extension in the spring, dreading it, but hopefully it will all be worth while.