Financing your ADU in Connecticut
There is more than one way to pay for an ADU, including options that leave your first mortgage in place. Which options fit depends on your circumstances and program requirements. Explore common financing approaches and use our calculators for planning estimates.
Plan for the whole project, not just the unit
Lenders we can introduce you to
We can introduce you to vetted third-party lenders that finance ADU projects, including local banks, credit unions and private lenders. Some programs consider a home's after-renovation value; lenders set eligibility and terms. Compare more than one offer.
Local banks
Credit unions
Private lenders
CT ADU isn't a lender and isn't paid by lenders. Introductions are optional.
Questions to ask about financing
Use these questions to understand the costs, requirements and repayment obligations of any financing you consider. Our guides and calculators can help you prepare.
How are funds released?
Ask about construction draws, required inspections and when payments begin.
What information is needed?
Ask what appraisal, project plans, income and property documents the program requires.
What will repayment involve?
Compare rates, fees, repayment terms, payment changes and the effect on your existing mortgage.
Loan amounts and eligibility depend on the lender, property, appraisal and borrower qualifications. Our resources are for planning; they do not determine loan eligibility or approval. If rent is part of your plan, review how lenders may assess ADU rental income. Compare the options in our financing guide.
Financing paths for a Connecticut ADU
There's no single "best" option — the right fit depends on your equity, mortgage rate, timeline, and how much you're building. Include ADU taxes and insurance when comparing ongoing costs.
HELOC
Borrow against available home equity through a line of credit. Compare draw periods, repayment terms, rates and fees in our guide to HELOCs and home equity loans.
Renovation line of credit
Some renovation financing uses a projected completed value. Our guide to renovation lines of credit explains appraisal, draw schedules and loan-limit questions to ask about the program you are considering.
Construction / renovation loan
Ask how project value, construction draws and inspections affect approval and funding.
Cash-out refinance
Replace your current mortgage with a larger one and take the difference in cash — a single lump sum and one monthly payment.
Reverse mortgage (HECM)
HECM reverse mortgages do not require monthly principal-and-interest payments, but taxes, insurance and upkeep remain your responsibility. Interest and fees increase the balance, and principal-residence requirements apply. Repayment events and eligible non-borrowing spouse protections depend on the rules and loan. Before changing which home you occupy or rent, confirm the arrangement with your HECM lender or servicer and a HUD-approved housing counselor.
Shared equity (HEA)
A home equity agreement provides an upfront payment in exchange for a later lump-sum repayment under the contract's formula. The amount can grow substantially and may be due when the term ends or you sell. Terms and restrictions vary.
Which path fits your situation?
A quick comparison of financing approaches and what to watch out for. None of these is a recommendation; the right fit depends on your equity, rate, and plans.
| Financing path | Considerations | Watch out |
|---|---|---|
| HELOC | Draw periods, repayment terms and available equity. | Rates are usually variable; payments can change, and the home secures the debt. |
| Home equity loan | A lump sum, usually with a fixed interest rate. | Compare fees and total repayment costs; the home secures the debt. |
| Renovation line of credit | Whether a program uses future value and leaves your existing mortgage in place. | Lender-specific rules; availability and terms vary. |
| Construction / renovation loan | Larger builds funded in draws tied to construction milestones. | Confirm documentation, inspection and draw requirements. |
| Cash-out refinance | Compare the new mortgage with your existing mortgage. | Compare the new rate, closing costs and total interest over the new term. |
| Reverse mortgage | Homeowners 62+ with substantial equity and a long-term plan. | Taxes, insurance, upkeep, occupancy requirements and a growing loan balance. |
| Home equity agreement (HEA) | An upfront payment with a later settlement based on the contract formula. | A potentially large future settlement, fees and contract restrictions; compare the full cost. |
What about ADU grants?
Do not assume grant funding will cover your ADU. Check current program availability, eligibility and eligible costs before including assistance in your budget. Our ADU grants guide explains questions to investigate.
HELOCs, renovation loans & second mortgages
The full breakdown, including how future-value lending works.
Will your ADU pay for itself?
Model rental cash flow and yield on project cost with the ROI calculator.
House hacking with an ADU
Use rental income to help offset the cost of ownership.
General information only, not financial or tax advice. CT ADU is not a lender or mortgage broker. Loan availability, rates, terms, loan-to-value limits, and after-renovation-value treatment vary by lender and borrower and are not guaranteed; confirm details with a licensed lender.
Background reading: CFPB guide to HECM reverse mortgages and CFPB overview of home equity contracts.