A player playing a Paladin in my current D&D campaign has asked how much it would cost to build or rent a building to house his followers from the Leadership feat. It would only be a small premises, enough to house a handful of followers, but it'd need to be able to be upgraded should the need arise.
I applaud the players thinking around this so I'm going to allow it – I just haven't a clue how much this should cost. How much should I charge the player for building a new premises for this purpose and how long should it take to build in-game? Also, if a building were rented, what would be an appropriate weekly charge?