Hi Londoner62,
I expect they probably would, providing the diameter was wide enough. I have only built square tunnels onto the hedgehog houses, but some of them have got to be approaching half a metre. If you could make it a square tunnel rather than a pipe that would provide them with more room. I think the diameter of a circular pipe would have to be a little bigger than the normal 12.5 or 13cm used to make hedgehog highways. But considering the entrances made to the hedgehog houses are designed to be small, to stop predators getting in, maybe an access point wouldn’t matter if it was a bit bigger, as long as it’s not big enough to provide access for foxes etc.
It sounds lovely having the planters forming part of the fence, and I think it shows excellent foresight to build in an access point. How are they currently accessing your garden? I assume there is a gap or gaps in the fence that needs replacing?
