Owning your own home

You could easily spend £100k on the first two items tbh. There could need to be a lot of steel and will depend on if more work would need to be done to the foundations.

Could be worth posting in the how to do a bathroom/kitchen/extension thread. As a few others have done similar work done. If I were doing it I’d be looking to work with an architect as layout probably needs some thought.
It’s a lovely house - do you know that part of Wanstead/Aldersbrook?

Knockdown existing kitchen and conservatory and build a new single-storey extension off the back for kitchen diner, and open out the two rooms that face the back of the house to make that open-plan

Leaving the existing rear wall in place would help massively on budget and there is a question of really how big any one room needs to be. If you build across the whole back including where the WC is you’d have a (?) 25 sqm room which I think is more than big enough.

Doable with some change from £100k depending on how fancy you get with cabinets, appliances and glass roof / bifold / crittal.

I don't live a million miles from that house and whilst it very nice, 100k probably won't touch the sides if you are doing a proper job on it. I'd say its more like 150 to 200k.

It's probably a tricky house to value as it needs a shit load of money spending on it but it's bare bones are still at present, pretty nice. But the refurb costs would need to be priced as if it were a wreck.

If you are able to you'd be probably better off buying one that's been pretty much done for 1.1.