here is what the IRS states:
If you built all or part of your house yourself, its basis is
the total amount it cost you to complete it. Don’t include in
the cost of the house:
• The value of your own labor, or
• The value of any other labor for which you didn’t pay.
What about costs for electricity and heating oil during construction? cost basis
Local property taxes? no. Schedule A only.
Debris and waste disposal fees? cost basis
Cleaning supplies in preparation for selling? selling costs
Tools needed for construction? debateable. are these tools your rented solely for the purpose of building. then cost basis. but if you bought tools that are still in your posession post construction, then I'd suggest, no.
Gravel, topsoil, and landscaping material like plants and grass seed? cost basis.
