There are 2 types of expenses that you can deduct related to your home office/business: Direct Expenses and Indirect Expenses.
Direct expenses are those expenses that are paid only for the business part of your home. For example, if you pay for painting or repairs only in the area used for business, this would be a direct expense.
Indirect Expenses are those expenses that are paid for keeping up and running your entire home. Examples of indirect expenses generally include insurance, utilities, and general home repairs. Since these are expenses you would pay for the entire home, these are considered indirect expenses.