Some time ago I bought a couple of these Rohan houses from Games Workshop...

They parts are very versatile and you can combine kits in a number of ways to produce not just a hovel, but a farm, smith, stables and even a longhouse. Unfortunately, at €34 per kit they are not exactly cheap; building a settlement will put you back with a pretty penny. On top of that, GW currently doesn't seem to not be able to keep up with demand
I got really hooked on building the sets I bought (which will end up a royal stud farm). By incredible good fortune got in contact with a chap who had given up on is expansive LotR plans and was selling his Laketown (3 buildings) and a Rohan Stronghold kits (six building kits, 2 wall and tower kits released as a bundle but no longer in the catalogue) with a considerable rebate.

This is going to be fun...