Yes, you can include the costs of the roof.
If you made energy saving improvements to more than one home that you used as a residence during 2017, enter the total of those costs on the applicable line(s) of Form 5695.
You may be able to take a credit of 30% of your costs of qualified solar electric property and solar water heating property. Include any labor costs properly allocable to the onsite preparation, assembly, or original installation of the residential energy efficient property and for piping or wiring to interconnect such property to the home.
Per the IRS Instructions for Form 5695:
- Qualified solar electric property costs - Qualified solar electric property costs are costs for property that uses solar energy to generate electricity for use in your home located in the United States. No costs relating to a solar panel or other property installed as a roof (or portion thereof) will fail to qualify solely because the property constitutes a structural component of the structure on which it is installed. The home doesn't have to be your main home.
For further information, please see the instructions for IRS Form 5695 at the following link: https://www.irs.gov/instructions/i5695
