As much as I like the MDF buildings that come with the Epic sets, they are scaled to 15mm and i game on a smaller table, so my preference is to use terrain that is one scale lower than the figures, which for me makes 10mm terrain a good working solution.
Battlescale do some lovely buildings and bridges etc in a good quality resin (solid pieces without air bubbles) and these are currently being sold by Pendraken.
I have bought 7 buildings done in the Tudor style of wood frame, plus a large stone English church and a couple of bridges - unfortunately the buildings themselves are still unpainted, but a good fit never-the-less.