ADU Financing · 2026
Home Equity Loan vs HELOC: Which Is Better for an ADU?
A home equity loan pays one lump sum, usually at a fixed rate with set payments. A HELOC is a credit line you draw from as needed, usually at a variable rate. Both borrow against your home’s equity. For an ADU, a HELOC often fits a build paid in stages, while a home equity loan gives you one predictable payment.
Rates, fees and terms vary by lender and change often, so treat this as a plain-English map rather than a quote. Here is the side-by-side first, then the details that matter when the money is paying for a backyard home.
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Home equity loan vs HELOC at a glance
| Home equity loan | HELOC | |
|---|---|---|
| How you get the money | One lump sum when the loan closes | A credit line you draw from as needed, up to your limit |
| Rate type | Usually fixed | Usually variable, so payments can change |
| Interest is charged on | The full amount, from the start | Only what you have drawn |
| Payments | A set monthly payment for the life of the loan | Based on your balance during the draw period (some plans allow interest-only), then a repayment period |
| Can you borrow again? | No, you would need a new loan | Yes, paying down the balance during the draw period frees up credit again |
| Best for | One known cost and a payment that stays the same | Costs that come due in stages over several months |
Both are secured by your home. If you already have a mortgage, either one becomes a second mortgage that you pay in addition to your first, as the Consumer Financial Protection Bureau explains. And because your home is the collateral, falling behind could put it at risk, so borrow an amount you can comfortably repay.
How a home equity loan works
A home equity loan lets you borrow a set amount using the equity in your home as collateral. Equity is what your home is worth minus what you still owe on it. You receive the money as one lump sum, and the rate is usually fixed, so your payment stays the same from the first month to the last.
The tradeoff is timing. Interest starts on the whole balance the day the loan closes, even while part of the money waits in your account for the next stage of the project. The CFPB also notes that home equity loans may have upfront fees and costs, so compare the total cost of each offer, not just the monthly payment.
How a HELOC works
A HELOC, or home equity line of credit, is a revolving line secured by your home. During the draw period you can borrow up to your credit limit whenever you need to, and your payment is based on what you owe at that moment. Some plans set a minimum payment that includes principal, and others allow interest-only payments during the draw period, according to the CFPB’s HELOC booklet.
When the draw period ends, you can no longer borrow and you enter the repayment period. Many lenders set a schedule to pay off the balance, but some plans require the whole balance at once, which is called a balloon payment. Ask which kind you are signing up for.
Three more HELOC details matter for a construction project:
- The rate usually moves. A variable rate means your payment can change from month to month. Some HELOCs let you convert some or all of your balance to a fixed rate, which is usually higher than the variable rate but more predictable.
- Some plans set a minimum draw. You may have to borrow a minimum amount each time, keep a minimum balance, or take an initial amount when the line opens.
- The lender can freeze or reduce the line. HELOCs generally allow this if your home’s value falls or your finances change for the worse. If your build depends on future draws, ask how your lender handles it.
Which is better for an ADU?
Neither one wins for everyone. The better choice depends on when your project needs money and how you would feel about a payment that changes.
A HELOC often fits when costs come due in stages over several months. You draw what each payment needs, and interest builds only on what you have used so far. For homeowners who want to keep carrying costs low while the home is being built, that structure is often the more efficient one.
A home equity loan often fits when you already know your number and want a payment that stays the same. You borrow the amount once, lock the rate at closing, and plan around one fixed payment. The cost of that certainty is paying interest on the full balance sooner.
If you like the HELOC’s flexibility but the variable rate worries you, ask whether the lender offers a fixed-rate option on part of the line. If your equity is too thin for either, a construction loan that lends against the finished value may reach further. Our guide to HELOC vs construction loan for an ADU compares those two directly.
How each option lines up with an ADU payment schedule
An ADU is not paid for in one moment. Your purchase agreement lays out when each payment is due as the project moves from design and permits to the factory build, crane delivery and finish work. Ask our team for that schedule before you choose a loan and share it with your lender, so the money is ready when each payment comes due. The more of the cost that lands early, the smaller the difference between a lump sum and a credit line.
A few things make the planning easier:
- Start with a known price. Our 14 models run from $199,000 to $599,000 all-inclusive, with a permitting budget built in. Exact permit costs and any property-specific site work are confirmed in your feasibility study, so the amount you bring to a lender is grounded in your actual lot.
- Know the build window. Model timelines run about 4 to 9 months from the day your construction deposit lands to final inspection, with 4 months the best case for our smallest model. Local permitting timelines vary by jurisdiction. A longer project means more months of interest on whatever you have borrowed or drawn.
- Your deposit is protected if the loan falls through. The $1,000 signup deposit is refundable if your financing fails. The feasibility study ($497 standard, or $997 for an empty lot) is credited toward your build if you sign within 90 days, and it is refundable only if your property cannot host an ADU, as a full refund minus payment processing fees.
Can you get a home equity loan on a rental property?
Sometimes, but terms vary by lender. Many home equity loans and HELOCs are written for the home you live in, and some lenders also offer them on rental or investment properties. Lenders that do lend on a rental may set different equity, credit and rate requirements than they use for a primary home, so ask each lender directly and compare offers.
For ADU owners the question usually comes up in one of two ways:
- You live in your home and want the ADU to be a rental. This is the most common case. You would be borrowing against your primary residence, which is the situation most home equity products are built around.
- You own a rental and want to add an ADU to it. Here you would be borrowing against an investment property, so expect fewer lenders and different terms, and compare a home equity product with a cash-out refinance or a construction loan on that property. Our guide to adding an ADU to a rental property walks through that scenario.
Either way, the future rent can matter. Some loan programs let a lender count part of an ADU’s projected rent toward the income you use to qualify, and the rules vary by program. Our guide to using future rental income to qualify for an ADU loan walks through how that generally works.
HELOC vs home equity loan vs cash-out refinance vs construction loan
| Option | Borrows against | How you get the money | Usually a good fit when |
|---|---|---|---|
| Home equity loan | Equity you have today | One lump sum, usually at a fixed rate | You know your total and want one set payment |
| HELOC | Equity you have today | Draw as needed, usually at a variable rate | Costs come due in stages and you want flexibility |
| Cash-out refinance | Equity you have today, by replacing your whole mortgage | One lump sum at closing | Today’s rates are close to or below your current mortgage rate |
| Construction loan | The expected value of the finished property | Released in draws as the build reaches milestones | Your current equity is limited |
The first three all depend on equity you already have. A construction loan is different because the lender looks at what the property should be worth once the ADU is finished, which is why it can work when equity is thin, with more paperwork and inspections in exchange. For the full menu, including renovation loans and ADU-specific products, see how to finance an ADU in California or our ADU financing page.
Questions to ask a lender before you choose
The CFPB suggests comparing estimates from more than one lender. For an ADU, bring these questions:
- Is the rate fixed or variable? If variable, how often can it change, and is there a cap?
- What fees are due at closing, and does a HELOC carry annual fees even when you are not using it?
- How long is the draw period, what happens when it ends, and is there a balloon payment?
- Is there a minimum draw, or a required first draw when the line opens?
- Under what conditions could the line be frozen or reduced during my build?
- Do you lend on rental or investment properties, and do you count projected ADU rent?
Frequently asked questions
Is a home equity loan or HELOC better for an ADU?
For many homeowners a HELOC fits an ADU better, because you draw money as build payments come due and pay interest only on what you have used. A home equity loan is the better fit if you already know your total and want one fixed payment from the start. Rates and terms vary by lender, so compare real offers on the same day.
What is the difference between a home equity loan and a HELOC?
A home equity loan gives you a set amount as one lump sum, usually at a fixed rate, and you repay it on a set schedule. A HELOC is a line of credit you can draw from repeatedly up to a limit, usually at a variable rate, with a draw period followed by a repayment period. Both are secured by your home and borrow against your equity.
Can I get a home equity loan on a rental property?
Some lenders offer home equity loans or HELOCs on rental and investment properties, and many only lend against the home you live in. Where it is offered, the equity, credit and rate requirements may differ from a primary home, and terms vary by lender. If you plan to rent out an ADU, also ask whether the lender counts projected rent, which our rental income qualifying guide explains.
Which is easier to qualify for?
Neither is automatically easier. Both are secured by your home, so lenders look at the same core things: how much equity you have, your credit, your income and your existing debt. Requirements differ by lender and product, even at the same bank. Our guide on what credit score you need for an ADU loan covers why there is no single cutoff.
Can a HELOC cover the whole cost of an ADU?
It can if your approved credit limit covers your full project price. Your limit depends on your equity, your credit and the lender’s rules. Framework First models run $199,000 to $599,000 all-inclusive, with a permitting budget built in and exact permit costs confirmed in your feasibility study, so you know the number to ask for. If your equity falls short, a construction loan that lends against the finished value may close the gap.
Should I talk to a lender before or after the feasibility study?
An early lender conversation is fine for a rough sense of what you might qualify for, but most homeowners get more useful answers after the feasibility study ($497 standard, or $997 for an empty lot), because it confirms what your lot allows and the scope you are financing. Later, when you sign, the $1,000 signup deposit is refundable if your financing fails.
We don’t lend, but we can help you get ready
Framework First is a builder, not a lender, and we don’t set loan terms. When you know which model fits your lot, our team can introduce you to ADU-focused lending partners, and you are always free to use your own lender or bank. Nothing here is a loan offer, a rate quote or financial advice, so confirm rates, fees and terms directly with a lender before you sign.
Want a real number to bring to a lender? Price a model in The ADU Designer by Framework First, run the monthly math in the ADU cost calculator, or book a feasibility study to confirm what your lot allows.
