ADUs
How do people actually pay for an ADU?
The most common reason a good ADU project dies is not the price. It is that the money was arranged in the wrong order.
There are four common routes: cash, a HELOC or cash-out refinance against the equity you have today, an unsecured renovation loan for smaller scopes, and renovation lending underwritten on your home's after-renovation value. The last one is the route that most often makes an ADU possible, because an ADU adds substantial value and today's equity is usually the binding constraint. Line the money up before the design phase, not after the permit.
Why the ordinary routes run out on an ADU specifically
A good-quality ADU in our area runs $300K–$360K for a good-quality build. That is a large number to reach with a home equity line sized against what your house is worth today, particularly for someone who bought recently and has not accumulated much equity.
Which produces the frustrating shape of this problem: the project that would add the most value is the one the homeowner is least able to borrow against, because the value does not exist yet.
The four routes
| Route | Best when | The catch |
|---|---|---|
| Cash | You have it and the opportunity cost is acceptable | Rare at this project size, and it ties up reserves during a build, which is exactly when you want reserves |
| HELOC or cash-out refinance | You have held the house a long time and carry real equity | Sized against today's value. A cash-out refinance also re-prices your whole mortgage, which matters a great deal if your existing rate is low |
| Unsecured renovation loan | Smaller scopes — a bathroom, a kitchen, a conversion | Generally does not reach ADU-sized numbers |
| After-renovation-value renovation lending | An ADU or addition, where the finished value is much higher than today's | More documentation up front. The plans and the scope have to be real before the lender can underwrite them |
Lending underwritten on your home's after-renovation value is sized against what the property will be worth with the work finished rather than what it is worth this morning. That is the difference that makes an ADU pencil for someone who has owned for three years instead of thirteen. We introduce clients to a senior loan officer at our partner RenoFi for exactly this. How that works →
One thing we will say plainly: Elusive receives no referral fee, commission or other compensation for introducing you to a lender. The loan, the terms and the approval come from the lender, not from us. We make an introduction because a project that stalls at the money is a project nobody gets to build.
Get the order right
Establish feasibility before you borrow anything
Walk the lot. Usable rear-yard space after setbacks, access for equipment and concrete, utility runs, and whether the existing electrical service can carry another dwelling. Borrowing against a project the site will not take is the expensive version of this mistake.
Get a real scope and a real number
After-renovation-value lending needs the project to be defined before it can be underwritten. A rough idea is not enough to lend against, and a lender's appraiser cannot value a plan that does not exist yet.
Line up the financing before design, not after permit
This is the step people invert. Paying for plans, engineering and plan check out of pocket and then discovering the build cannot be funded is the most common way an ADU dies, and it dies after the owner has already spent real money.
Budget the soft costs separately
Roughly $13,500–$18,500 of soft costs land before construction starts — plans, survey and certification, soils work. They are fixed regardless of unit size and they are often the first money out of your pocket, sometimes before a construction loan has funded.
Ask the city about pre-approved plans in the same week
Under AB 1332 every California city must run a pre-approved ADU plan programme. Where one exists it can take most of the plan cost out of the project entirely, which changes how much you need to borrow before you borrow it.
Three things worth knowing before you sign anything
- The lever is usually the term, not the rate. What decides whether a payment works is generally how long it is spread over. Rate shopping alone tends to be the less useful conversation.
- Rental income is not automatically counted. Whether projected ADU rent helps you qualify depends on the lender and the product. Ask before you build a plan around it.
- Watch the deposit rule. A construction draw schedule and a lender's disbursement schedule have to line up with a contract whose down payment is capped at $1,000 in California. A builder demanding a large up-front payment is a problem before it is a financing problem.
We are builders, not lenders or financial advisers, and nothing here is advice about your finances. What we can tell you accurately is what the project costs, when the money is needed, and in what order — and that is usually the part missing when someone is trying to work out whether this is possible.
Common questions
How do most people pay for an ADU in California?
What is after-renovation-value lending?
Does Elusive Construction get paid for referring me to a lender?
When should I arrange financing for an ADU?
Do I need to fund the soft costs separately?
Where to go next
Written by the team at Elusive Construction, a licensed California general contractor (B #1112902) building in Santa Clara and San Mateo counties. General information about how residential construction works — not legal advice. For your specific contract, talk to an attorney.
Also Worth Reading
The rest of what we publish
Cost guides
What an ADU, an addition, a kitchen or a whole house actually costs here, and what moves each number.
Our own projects
Two jobs written up start to finish, including what we found once the walls were open.
Paying for it
Renovation lenders we work with. We take no referral fee, and we never quote you a rate.
Where we build
Sixteen cities across two counties, and what genuinely changes at each city line.
Have a project you want priced honestly?
Book a Project Discovery Call and we'll tell you what's realistic — scope, budget and timeline — whether or not we're the right builder for it.