Probably Chapel, since it cost not only a ton to get the level for the alter, but the alter itself cost a fair bit.

My house is CRAP! i have a guilded alter so my chapel so far.

 

 

 

After i get 99 construction ill make about 20m and make it look nicer.

 

 

 

See my siggy for my blog.

probably my quest hall, it has glory trophy and my top to the line 48 con house cost a lot, but has cheap rooms

Portal Room. Not much of a construction fan. My house is layed out like this:

 

 

 

First room to the west = Altar.

 

First room to east of portal = Canifis Portal.

 

 

 

Absolutely perfect for barrowing! \ I use my house for nothing other than barrows, all other rooms are junk haha.