House belonged to an old lass.
Jobs to do, move wall to make kitchen bigger & lounge smaller.
New kitchen,
Paint walls.
Upstairs, remove tank & install combi boiler, remove tank cupboard & put in a new bath, shower etc.
Remove bath from other bathroom & make it back into a bedroom making the house three bed instead of two.
Remove stairlift.
In the garden, trim trees to open view of the fields,
That’s about it, maximum spend, Bev thinks twelve grand I think twenty grand.
My tuppence worth.........
Assuming it's a stud wall I would estimate somewhere between your two estimates, significantly over the higher estimate unless you do a lot - a LOT - of it yourself. Assuming budget kitchen appliances and bathroom. Removal of stud wall may require the services of an electrician unless you are confident about moving/isolating switches/sockets etc yourself.
Dare I mention having a survey?
Consider making kitchen and lounge open plan, it's all the rage you know
.maybe Install a serving hatch
.
Depending on confidence levels you can do a lot of the donkey work on replacing boiler yourself - no need to pay a qualified plumber to physically hang it. in my experience plumbers are usually more than happy to do the connections and commissioning after the spade work has been done. And you can almost certainly get a boiler yourself significantly cheaper than a tradesperson will charge.
Find out what trades charge per day - I know what they are down here, you need to establish for your area. Unless you already have a working relationship,expect long lead in times so planning is essential,as every day you have the property it is costing you money.
Don't forget to include all the costs like additional stamp duty, council tax, etc and rubbish removal (not cheap!). Establish ceiling price for sale,- absolutely essential from the outset.
And a general piece of advice - anything unexpected tends to 'be a thousand pounds' to rectify. It's the law.
Good luck