We lived in. Oct 2019 - Sept 2020 for a full replumb and rewire, structural alterations on both levels, new kitchens, bathrooms, flooring, full redecoration. Two kids, aged 3&5 (at the start).
It honestly wasn’t so bad, but it’s a fairly large house. We spent the first year living in roughly half of it (not always the same half) and moving stuff around. It wasn’t easy but there are pros and cons.
Biggest pros are being around to see what’s going on, including stopping some bonkers decisions from happening. Save £££
Biggest cons are the mess and disruption to the living space.
There was one period where I considered moving out/going on holiday because it was really messy, but it was ok.
Messiest parts were: chasing for the rewire, knocking down walls, knocking out a chimney breast, bringing ceilings down, plastering.
Surprisingly ok part was the plumbing - we have a great plumber and we did that in stages. Heating first, which wasn’t too bad and took a week (for 18 new rads), and the rest of the pipework was changed as we went, including a new mains supply.