Depends: we had the mortgage survey done - which was mandatory, and seemed chiefly to establish that there was indeed a house at the given address that the bank could seize if I failed to stump up the payments - but chose not to bother with a buyer's survey as the house was relatively new and unmodified and in a geologically boring area, plus the survey excluded so much and had so many caveats that it didn't feel worth the asking price. We had a good look over everything ourselves, and nearly eight years on nothing's gone wrong with the place that we didn't anticipate and budget for.
But my brother's currently buying a flat in London that's been converted from a Victorian terrace with an extension, and I'm advising him to get it properly looked over structurally, as there's a lot of scope for bodging and woe there.
My son fell foul of that in his house in London - someone had bodged the drainage inasmuch as there were no underground drains, the downcomers just soaked into the ground and the water has excavated huge cavities that are having to be filled with concrete and proper drainage installed.
Brilliant when he is trying to sell the house.