> You can absolutely most definitely do it for nothing but material cost.

> $60k for a house

Where did you build the house? Presuming it's on land you own, how did you come to own the land? If you purchased it, the purchase amount should be included in the cost. If you did not purchase it, consider how lucky you are.

Edit to reply to the dead reply:

I do see the context of this being on already-owned land so my point is moot. Apologies for that. (For what it's worth, I'm not really convinced by the fact that you can get free land where nobody wants to live but that's another matter.)