Financing your ADU in Connecticut
You don't need to drain your savings — or give up a low first mortgage — to build an ADU. We'll help you compare the options and connect you with Connecticut lenders who actually understand accessory dwelling units.
Not every lender gets ADUs — the right one changes what you can build
Lenders CT ADU can connect you with
CT ADU isn't a lender — but over years of Connecticut builds, our team has built relationships with financing sources that actually understand ADUs, renovation and modular, so you're not starting from a cold call.
Local banks
Relationship lending from institutions that know Connecticut property and the towns we build in.
Credit unions
Often competitive on home-equity products for members, with a community focus.
Private lenders
Flexible underwriting for cases that don't fit a conventional box — including some that lend on after-renovation value.
Two things homeowners are often surprised by: some of these lenders underwrite to your home's after-renovation value (ARV), and some of the second-mortgage lenders we work with allow a combined loan-to-value as high as 100% (most large banks cap around 80%) of your home's value for well-qualified borrowers. These programs are case-by-case and depend on the lender, the property, and your qualification, so we help you find the right fit rather than promise a number. Compare the structures in our HELOC vs home equity vs renovation loan guide.
Six 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.
HELOC
Borrow against the equity you already have and draw only what you need as the build progresses. Often the simplest starting point.
Renovation line of credit
Structured around your home’s projected value once the ADU is complete — unlocking more borrowing power than a standard HELOC.
Construction / renovation loan
A structured loan sized to the completed project and released in draws tied to construction milestones.
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
Convert home equity into funds with no required monthly payments, so you can add a unit and stay in your home.
Shared equity (HEA)
Partner with an investor who funds part of the project in exchange for a share of the home’s future value.
Which path fits your situation?
A quick read on what each option is best for — and what to watch out for. None of these is a recommendation; the right fit depends on your equity, rate, and plans.
| Financing path | Best for | Watch out |
|---|---|---|
| HELOC | Flexible draws and strong current equity — a common starting point. | Usually a variable rate, and limited to your home’s current value. |
| Home equity loan | A fixed payment and a known budget from day one. | Less flexible than a line of credit during a staged build. |
| Renovation line of credit | Keeping a low first mortgage while borrowing on future value. | Lender-specific rules; availability and terms vary. |
| Construction / renovation loan | Larger builds funded in draws tied to construction milestones. | More documentation, inspections, and process than a HELOC. |
| Cash-out refinance | When replacing your first mortgage genuinely makes sense. | Unattractive if your current mortgage rate is low. |
| Reverse mortgage | Homeowners 62+ with substantial equity and a long-term plan. | Estate, tax, insurance, and occupancy implications to review. |
| Home equity agreement (HEA) | Avoiding monthly payments by sharing future value. | You give up a share of the home’s future appreciation. |
What about ADU grants?
Connecticut doesn't offer a dedicated statewide ADU grant for most homeowners — but energy incentives and certain programs may help with pieces of a project. We break down what actually exists in 2026.
HELOCs, renovation loans & second mortgages
The full breakdown, including how future-value lending works.
Will your ADU pay for itself?
Model cash flow, cap rate, and DSCR with a live 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 and makes informal introductions to third-party lenders. 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.