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Not sure that's fair. It sounds like your mum got a decent price, but you've phrased it as though it's a big job, when in fact there's no serious structural stuff, likely minimal excavation, no plumbing, minor electrical, limited materials for finishing, etc.
I'd say the main thing this place is guilty of is expensive tastes. The sort of inspiration people post tends to be top end.
A builder mate always used to moan about people asking for quotes for things - like say a bathroom hoping it'd be £5k. While sharing a mood board full of >£20k bathrooms.
Dont forget this is the London £40k Kitchen and Single Speed Forum.
Easily doable for under £5k if you are OK not having top of the line everything.