I want to build something big.
Should* I build a complete house (interior and everything) with lego bricks?
.* By "should" I mean, will it be safe? How big can I go? How much do you think it will cost?
James May built a full-sized LEGO house for his TV show James May's Toy Stories on the BBC back in 2009 using around 3,500,000 bricks. Whether you'd actually want to do this yourself...
During the episode they spent some time with engineering students working out the most load bearing configurations of bricks especially for the upper floor, as well as working on the general structure.
To get around the insurance requirements, in the end they resorted to building the house around a wooden frame including floors - and although they did continue working on the beams, and James did stand (rather nervously) on the final designs, they don't appear to have been released.
With regards to the rest of the house (i.e. fixtures and fittings) there were some issues as I recall:
If you want to know how many bricks you'd need, there is some site to help you calculate it.