Financially, the decisions you take ‘now’ will have huge impact ‘later’.
When someone has their own house, then I would warn that you DO have to ‘be prepared’ for the ENTIRE value of the house to ‘go’ in fees. That has to be accepted from the off, because, unless the house is worth a million (!), you just can’t ‘forecast’ how long someone will live, however frail they are, or whatever health complications.
So, if you DO want to ‘inherit’ then residential care is very risky. Yes, you MAY end up with something - or you may not!
The only alternative is to be prepared to sustain ‘care at home’ for an ‘indefinite period’. However, all too many family carers think they can do this, but find themselves in a lobster pot - they’ve started caring, they are ‘counting’ on inheriting their parents’ house/flat, but the caring ‘burden’ gets heavier and heavier and heavier. Only death, sadly, can break that - and ‘no one knows’ when that will happen…
It’s a tough choice in either case, but you MUST make it ‘up front’. The very worst situation to be in is to start with the intention of inheriting the house, and spend several years ‘coping’ with the care yourself…only to find you break under the strain, and the parent still has to go into residential care and then you may lose the house anyway…
As for costs, these can be quite variable, probably depending on location and ‘luxury level’. The two are probably linked - for example, near me, in the Home Counties, there are a lot of ‘luxury care homes’ because incomes round here are high. That’s the £50k plus per anum category! However, my MIL was in the West Country, and paid £100 a day, which is significantly less per year, so her funds didn’t quite run out before she died. The homes were very comfortable, but I wouldn’t call them ‘luxury’.
HOWEVER, it is NOT the 'luxury that counts. Of course you want something pleasant and comfortable, but ‘luxury’ is pretty irrelevant. What REALLY counts is the quality of the staff. That is what will make the difference - kind, dedicated, efficient carers and nurses ,and a friendly and supportive and cheerful atmosphere.