I'm doing exactly the same thing, work starting this week.
Was extra spenny as each of the neighbouring houses have been split into flats so 4 x surveys, plus 2 x freeholders (no share-of freehold annoyingly) which pushed back work by 6 months.
I keep telling myself it's worth it for peace of mind.
It's jsut an annoying expense which I had £0 in my budget for.