You set up the roof as an asset of the business.
Since you already know that the home office is 9% of the overall house then take that amount of the cost of the roof for the depreciation.
Step 2: Describe this asset, choices:
1. Computers...
2. Tools, machinery, equipment, furniture
3. Real estate property
4. Intangibles, other property.
You should pick #3 Real Estate Property
When you get to the question about if it is used 100% for business the answer is yes.
More information about Home Office Deduction
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