Financing is often the biggest obstacle for ADU projects, even for homeowners with space and need. Few lenders specialize in ADU loans because they don't fit traditional models—falling between new construction and second mortgages.
The best type of loan for building an Accessory Dwelling Unit (ADU) depends on your financial situation, home equity, and long-term plans. Here are six options:
Best for flexibility. Borrow as needed during construction. Pay interest only on what you use. Ideal with significant home equity.
Best for a fixed budget. Lump sum funding with fixed monthly payments. Good for homeowners who know the full cost of the ADU upfront. Fixed interest rates provide predictable payments.
Best for a fixed budget. You pay off your old mortgage and replace it with a new one. Lump sum funding with fixed monthly payments. Fixed interest rates provide predictable payments.
Best for including ADU costs in a mortgage. Options like FHA 203(k) loan or Fannie Mae Homestyle Loan allow financing ADU construction as part of a home purchase or refinance. Great for adding an ADU to a newly purchased home.
Best for fast funding & investors. Faster approval than traditional loans. Higher interest rates. Easier qualifications.
Best for ground-up Home & ADU builds. Good for building a new house and a detached ADU from ground up. Short-term loan that converts into a mortgage after construction. Strict guidelines.
Below is a list of lenders experienced in ADU financing. They understand both the local market and the unique challenges of ADU projects. Before reaching out, ensure you understand their loan offerings.
MyADUEXPERT is not a lender; information provided is for reference only. Contact lenders directly via our form for details on actual loans.
Risk Factors: All secured loans use your home as collateral. HELOC rates can change, private lending has higher costs, and construction loans have strict guidelines.