But basement extensions do add to the house’s value. The new owner gets the space without the time, risk and aggro of getting the work done themselves, and if they don’t like the decor they can renovate it…
In the linked article a specialist basement archiitect says:
Maybe the [main] property’s worth £2,000 per square foot, and the basement maybe £1,500 or even £1,000 per square foot. But because I can build that for £500 per square foot, there’s a simple commercial decision there.
