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Yes. I realised I'd need to spend £25k on a cheap job (because of the plumbing, electrics, boiler issues, ripping up the floor, etc)... and really the +£30k difference is me thinking I am not moving from here for a significant period of time - a decade or two perhaps, so going for super high quality to make that a low cost of ownership with few to no surprises, at the cost of a high expenditure now.
For me, aside from all of the existing problems - that end of the house doesn't feel like a home to me. I want it to. I want it to be a space that emotionally entices me to be in there, I want to want to be in there. The colours, the materials, the quality, the light, the atmosphere in there... all of it contribute to being a space in which I want to be.
I assume you're planning on staying there for a long time? This kind of premium work doesn't tend to translate well to uplifted property values but if you're planning to be there a long time and it's important to you then go for it.