Sorry, but unless there are some luxury materials we don't know about involved, these quotes strike me as absolutely mad, especially those around redecoration and cosmetic work. This one was my particular favourite:
£3.5k new lights in lounge, remove back boiler, new flooring, new lights, remove french doors
'New lights in lounge' - You're supplying your own light fixtures, surely? Any moving the locations or adding new lights should be included in the rewire quote.
'Remove back boiler' - you've already paid for that elsewhere
'New flooring' - already paid for that elsewhere
'New lights' - again?
'Remove french doors' - so 3.5k to remove French doors?
Re wanting to know what others have paid: I have paid one guy £100 and someone else £125 per day to strip wallpaper. It took them 4 days to do the downstairs (everywhere except kitchen), the stairs (which is the difficult bit), and the upstairs hallway. So in total came out at £475 for about half of a 3-bedroom house. In London, this year. A Victorian house, so quite a bit narrower than a 30s one, but on the other hand it was overpainted woodchip wallpaper so comes off very slowly in two separate layers.
As for carpet, by the time you have got someone to quote to pull it up, you could have done it. My council charges £20 to take 5 large bags away, or you can drive it to the dump. I believe carpet fitters will usually take up the old one and dispose of it for a small amount extra.
As for skimming - how do you know it needs it? You haven't seen the plaster yet! I was expecting the worst in our horribly looked-after fixer upper. Our plaster is like glass.
Six months also seems completely ridiculous.
I think you need to decide what kind of renovator you are. Do you want to get one person to quote for everything, hand over the keys, go and live in a rented house and come back at the end to a finished house? If so, then, yes, you will pay a big mark up (not sure if it should be quite this big though!! But I don't know). Or do you want to organise and pay for each job individually and troubleshoot as you go? If so, then you need to find an electrician to do the electrics, a plasterer for the plastering, a builder for the steels, and so on. What you absolutely don't want to be doing is paying a builder builder's rates to strip wallpaper for you.
Meant completely nicely, but it sounds like you don't understand much of what is involved in some of these jobs? I think you should get on youtube and find out. Even if you don't want to DIY any (and lots of them are easy jobs and prime DIY pickings), understanding will help you specify what you want and get a sense of how much you expect them to cost. And obviously you need to be getting more than one quote before you hand over these kind of sums of money.
And also widening/adjusting the doorways slightly so the doors close better? Would that help to explain the price? - do you mean knocking out bricks to widen the opening and then making it all good again? Or do you mean planing/sanding back the door frame a bit to ease a sticking door? If the latter, absolutely not.