A countryside property on the outskirts of Leeds has come to market boasting a self-contained annexe and substantial gardens, a listing that on the surface reads as routine estate agent fare but which, on closer inspection, illustrates one of the more durable structural shifts in the UK housing market: the rising premium attached to multigenerational living space. Properties offering separate annexe accommodation are no longer a niche curiosity for large rural estates. They have become a mainstream buyer requirement, and increasingly a distinct asset class that commands its own pricing logic, separate from the broader square-footage calculations that have traditionally governed valuations.