Actually, one guy made a decent base line of prices, based off the cost of meals. The result is that a 'poor' house (dirt floor, thatch roof) costs 3gp per square foot (75gp per 5-foot tile), a 'common' house (wooden floor, tar+shingle roof, furniture) would be 9pg per square foot (225gp per 5-foot), and a 'good' house (stone floor, upper floor and/or basement) would be 15gp per square foot (375gp per 5-foot).
The formula there is meal cost (1sp, 3sp, and 5sp) x 30 = 1 square foot.
For 1,000gp, you could get 13x 5-foot tiles, probably a 3x4 house with the leftover 100gp going towards furnishings, for dirt floor and leaky roof.
A similar sized 'common' home would cost you 2,700 without furnishings, and a 'good' home would be 5,000.
Making rough guesses, if we base off a six player party, and give 3x3 room to everyone, that's 54 tiles of raw floor space, but that'd be lack of privacy, or putting in a hallway, a 2-wide hallway would be +16 tiles. Add a little storage closet on the end, for +2 or +4... 74 5-foot tiles would cost 5,550, 16,650, or 27,750 for a modest bunk-house, not including things like kitchens, fireplaces, bathrooms, or luxuries. Purely small 3x3 rooms for everyone.
I'll have to think more on it, but it'll likely be a bit cheaper than that.
NINJA: Naryar spending a few days to build a house is incredibly fast. And you can hire mooks for 1sp per day to come haul stone/lumber, or hire stonecrafters/carpenters for like 1gp per day to do basic labor. It would honestly be significantly cheaper to produce your own building, considering that lumber is historically a waste produce, from clearing land to live and farm on (gotta fell a LOT of trees for an acre of farmland) and stone is literally just lying a day's travel towards the mountain.