I suppose you only get what you pay for? You obviously got a cheap cash in hand job last time, which wasn’t done properly and now needs the-doing.
The price of everything seems to have risen, especially labour as people struggle with living costs.
I’ve just had some exterior work done, at a cost of almost £10K - but 4, sometimes 6 men and scaffolding for 9 days, plus raw materials and VAT.
I hope you get the other quote to compare. Could you get some local recommendations from friends, even if it means going on a waiting list for the work?