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