They will be claimed in the Home Office expense section for your Schedule C.
As you go through the home office section, there will be a question about whether you had expenses that apply only to the home office. When you answer 'yes' to this question, each category of expense will have an area to enter two numbers -- one that pertains to the whole house and one that pertains only to the home office.
More extensive work, such as remodeling or adding a new roof, should be added in the Assets section as a home improvement and depreciated (written off over several years).
Repairs that benefit only part of your home, but not your home office, such as painting your kitchen, should not be counted as a home office expense (the expenses must either benefit your entire home, or specifically your home office).
If part of the renovations were only pertaining to the home office, then you would enter those expenses in that section.