The USDA Rural Housing Service provides loans to very-low-income homeowners to repair, improve, or modernize their homes or provides grants to elderly (62 or older) very-low-income homeowners to remove health and safety hazards.

• Eligibility requirements, loan and grant amounts, etc.
• Single Family Housing Repair Loan and Grants fact sheet
• Single Family Housing Programs
• Eligible dwelling size: 440 minimum to 2,000 maximum square feet. These may be waived on rare occasions, so people with smaller or larger dwellings may apply. Source: Handbook HB-1-3550, Chapter 5, page 12 (pdf page 245).
• All USDA Rural Development projects

Web pages from above with visible url links

• Single Family Housing eligibility requirements, loan and grant amounts, etc - https://www.rd.usda.gov/programs-services/single-family-housing-repair-loans-grants/ca
• Single Family Housing Programs - https://www.rd.usda.gov/programs-services/single-family-housing-programs
• Single Family Housing Repair Loan and Grants fact sheet …