Does a patio add value?

[BareGrylls]

Back garden is flat and enclosed by fence, relatively private. It has grass but no patio or obvious seating area and no shed. Owner plans to stay no more than 5 years and never uses the garden.
Is it worth putting in a shed and patio, would the cost be recouped?
It would cost around £4k and the house, a 3 bed semi, is currently worth around 150K

Probably not, though I’m no expert. A well kept, non-neglected garden would add some value or appeal. If you wanted to demonstrate “hey you can sit out here in the summer” they could just put a small nice cheap table and chair set out on the grass when it came time to sell.