Most Sacramento-region homeowners fund an ADU through some combination of a HELOC, a cash-out refinance, or a renovation/construction loan (Fannie Mae HomeStyle, Freddie Mac CHOICERenovation, or FHA 203(k)), because a code-compliant ADU generally isn't cheap enough to pay cash for outright. The mechanical difference that matters most: a HELOC or home equity loan lends against your equity today, while a renovation or construction-to-permanent loan can lend against the home's appraised value after the ADU is finished. That distinction decides whether a homeowner with modest current equity can still build. Two corrections worth making up front. First: the $40,000 CalHFA ADU Grant that still shows up in older articles has been closed to new applicants since December 28, 2023, with no reopening announced. Second, and more useful: since March 21, 2026, Fannie Mae's underwriting system will count projected ADU rental income toward qualifying on a purchase or limited cash-out refinance, capped at 30% of your qualifying income and 75% of the appraised rent, a real, dated, primary-sourced update most financing content hasn't caught up to yet. This is a construction cost question and a lending question, and they're different jobs. Call us at (530) 204-8294 for the build number; talk to a lender or mortgage broker for what you qualify to borrow.
Two Different Questions, Answered by Two Different People
A homeowner in Elk Grove or Woodland researching an ADU runs into the same wall almost immediately: half the articles online cover permits and square footage, the other half cover financing, and neither answers the question that actually decides whether the project happens: how do I pay for this, and what will a lender actually let me borrow?
We're a general contractor, not a lender. We can tell you, with real precision, what a garage conversion or a detached ADU costs to build in Sacramento, Davis, Woodland, West Sacramento, Elk Grove, Folsom, Roseville, or Dixon. We can't tell you what you personally qualify to borrow, your rate, or whether a bank will count your rental income toward your debt-to-income ratio. That's underwriting, and it belongs to a lender or licensed mortgage broker, not a construction company, a split we'll repeat throughout because it's the thing most ADU-financing content online blurs past.
What follows lays out the real financing landscape as it stands today, corrects a few things that are quietly wrong in older content, and points you toward the conversation you actually need to have next.
The Mechanical Distinction Almost Nobody Explains Clearly
One concept explains most of the confusion homeowners run into when they start calling lenders.
A HELOC, a home equity loan (HELOAN), and a cash-out refinance all size your borrowing power against your home's equity right now. The lender appraises the home as it currently sits, subtracts what you still owe, and lends against a slice of what's left. Limited equity today means limited borrowing power today, regardless of how much value the finished ADU would add.
A renovation loan (Fannie Mae HomeStyle Renovation, Freddie Mac CHOICERenovation) or a genuine construction-to-permanent loan works differently: the lender underwrites against the property's projected as-completed appraised value, what an appraiser believes the home will be worth once the ADU is finished, based on your plans, contractor bid, and comparables. That's the mechanical reason a homeowner with relatively little equity today can sometimes still finance a full ADU: the loan is sized to where the property is headed, not where it sits right now.
That's also why two homeowners with nearly identical home values can get very different answers from the same lender, one shopping equity-based products, the other qualifying for a completion-value product. If a lender says “you don't have enough equity” without mentioning renovation or construction-to-permanent options, ask directly whether they offer one, or find a broker who does.
None of what follows is financial advice specific to your situation. Rates, underwriting overlays, and program eligibility move constantly and vary by lender, so we're deliberately not quoting a number here that would be stale within weeks. Talk to a lender or mortgage broker about what you specifically qualify for.
HELOC and Home Equity Loan: Borrowing Against What You Have Today
A HELOC is a revolving credit line secured by your home's equity; you draw funds as needed and generally pay interest only on what you've drawn. A home equity loan (HELOAN) is the fixed-rate cousin: a lump sum, a fixed payment, a set term from day one.
For ADU construction, a HELOC's draw structure tends to fit how contractors actually bill: a deposit, then progress payments tied to completed phases (foundation, framing, rough-in, finishes), so you're not paying interest on the full loan before the slab is even poured. A fixed home equity loan trades that for payment certainty, useful once you have a firm, itemized bid and don't expect the number to move.
Both require meaningful existing equity and use your home as collateral. Whether you have enough to cover a detached ADU (routinely $175,000 to $340,000 all-in in this region) is a question your lender needs your specific numbers to answer, not something we can tell you from a construction estimate. We can give you the construction number; a lender tells you what it means for your equity position.
Want a real construction number to bring to that conversation? SafewayQuickQuote.com gives you a build-cost ballpark in about two minutes. It can't tell you what you'll qualify to borrow against it, only what the project itself is likely to cost.
Cash-Out Refinance: Rolling It Into Your First Mortgage
A cash-out refinance replaces your existing mortgage with a new, larger one and hands you the difference in cash. Because it replaces your primary mortgage rather than sitting behind it as a second lien, it typically carries different pricing than a HELOC or home equity loan, and it resets your mortgage term, if you're ten years into a thirty-year loan, you generally start the clock over.
If you financed years ago at a rate well below today's market, a cash-out refinance means giving up that rate on the entire balance, not just the ADU portion, often making it the more expensive option despite an appealing sticker rate. Without that gap, it can be the simplest single-loan option available. Whether the trade-off makes sense depends on your current rate, remaining term, and plans for staying in the home, a conversation for your lender, not a contractor's blog post.
Renovation and Construction-to-Permanent Loans: Building Against What the ADU Will Be Worth
This is the category most Sacramento-region homeowners haven't fully explored, and it's where the completion-value mechanic above actually does the work.
Fannie Mae HomeStyle Renovation and Freddie Mac CHOICERenovation are conventional products that finance a home purchase or refinance along with renovation or new construction, including an ADU, in a single loan. Funds for the ADU portion are typically escrowed and released to your contractor in draws as work is completed and verified, similar to a standalone construction loan. Because it's underwritten against the as-completed value, the amount you can borrow isn't strictly capped by your equity today.
FHA 203(k) is the government-backed version of the same idea, generally aimed at homeowners who might not qualify for a conventional program, with its own rules, contractor requirements, and inspection milestones.
A true construction-to-permanent loan works slightly differently: it funds the build in draws, often at a short-term rate, then converts automatically into a standard long-term mortgage once the ADU passes final inspection, so you're not applying for two separate loans.
All three require detailed plans, a licensed contractor's itemized bid, and a lender-ordered as-completed appraisal, so they generally take longer to close than a HELOC and involve draw inspections during construction. Ask any contractor you're considering whether they've worked construction-draw loans before, since not every contractor's invoicing style fits how these loans release funds.
Which of these three fits your credit profile, timeline, and local lender relationships is a mortgage broker's job to sort out. We can tell you what the ADU itself is going to cost to build, the number a lender needs before any of these programs can move forward.
What Actually Happened to the $40,000 CalHFA ADU Grant
If you've read anywhere that California homeowners can get a $40,000 grant toward ADU pre-development costs, here's the honest update: that program isn't currently available, and hasn't been since late 2023.
The CalHFA ADU Grant Program launched with roughly $100 million in funding, distributed first-come, first-served to reimburse pre-development soft costs like design, engineering, and permit fees, up to $40,000 per project. Demand outpaced the funding almost immediately. CalHFA's own program page states plainly that the latest round was fully allocated on December 28, 2023. No waitlist, no confirmed reopening date, no partial program in its place.
We're flagging this because it's the single most repeated piece of wrong information in ADU-financing content right now. Plenty of articles that rank for “ADU financing California” were written while the grant was active and never updated. CalHFA itself now warns that anyone offering to help “secure” this grant outside official channels may be running a scam, since there's currently nothing live to secure. If a future state budget cycle reopens it, we'll update this post. Until then, don't build a budget around it, and verify current status directly at calhfa.ca.gov.
Can Projected Rental Income Help You Qualify? The Update Most Sites Haven't Caught Up On
This is the most valuable update in this whole guide, and it comes with an exact date attached, so we're not going to blur it into the vague “rules recently changed” language most ADU-financing content uses.
Fannie Mae: effective March 21, 2026, with real limits attached
Fannie Mae updated its Desktop Underwriter (DU) automated underwriting system to version 12.1, effective the weekend of March 21, 2026. Sourced directly from Fannie Mae's own published guidance, the update allows projected ADU rental income to count toward a borrower's qualifying income, but only within a specific set of gates:
- Capped at 30% of the borrower's total qualifying income.
- Only 75% of the lesser of appraised fair-market rent or the actual lease amount counts, the rest is treated as a standing vacancy/expense discount.
- Applies to purchase transactions and limited cash-out refinances only, not standard cash-out refinances and not investment properties.
- Applies to a one-unit primary residence with an ADU; only one ADU's income counts even if a property has more than one accessory unit.
- Documentation requires a Form 1007 Single-Family Comparable Rent Schedule alongside the standard appraisal, or actual rental history from tax returns if the ADU is already built and rented.
That combination of gates is the real story, not the one-line headline “ADU rental income now counts.” Which 25% of the rent doesn't count, and which refinance types are excluded, decides whether this actually helps your application. DU version updates carry their own transition rules for loans already in process, so confirm current eligibility and documentation with your lender.
FHA 203(k): a different split for a new ADU vs. an existing one
Multiple industry sources, consistently but without a primary HUD document we could pull directly, describe FHA treating a new or proposed ADU differently from an existing, already-rented one. For an existing ADU with rental history, roughly 75% of the rent can typically count, similar to Fannie Mae's math. For a new or proposed ADU built through a Standard 203(k) loan, that figure commonly drops to around 50%, reflecting the added uncertainty of space that isn't built or leased yet. FHA also generally requires the borrower to occupy one of the units as a primary residence. Secondary-sourced; confirm the exact current percentages with your 203(k) lender.
Freddie Mac CHOICERenovation: a reported May 2026 tightening, unconfirmed at the primary source
One more update, with a heavier hedge attached. Multiple secondary sources report that Freddie Mac tightened CHOICERenovation guidelines for applications on or after May 4, 2026, so rental income from a unit created inside the same funded renovation can no longer count toward qualifying, while income from an existing, already-built ADU may still be usable. We couldn't confirm this against Freddie Mac's own primary guide text; its fact sheet wasn't accessible to us. Treat this cutoff as reported, not verified, and confirm the current rule with your lender.
This whole area is a meaningful shift from a few years ago, when almost no conventional lender would count ADU income before the unit was built and leased. Treat everything above as a starting point for a lender conversation, not a guarantee for your specific file. For the rent side of the equation in Davis specifically, our Davis ADU rental income guide covers realistic rent ranges by unit size and honest payback timelines.
AB 1033: Why “Selling Your ADU” Doesn't Change Financing Here Yet
One more piece worth understanding, because it changes the entire financing picture where it applies: AB 1033, in effect since January 1, 2024, lets a city or county adopt a local ordinance allowing a homeowner to sell an ADU separately from the primary home, essentially condo-izing it. Where that's live, it opens conventional purchase-money financing for a buyer of just the ADU, instead of requiring the buyer to purchase the entire property.
As of 2026, that's a genuinely narrow list: San Jose, Santa Monica, and unincorporated San Diego County have adopted local ordinances enabling separate ADU sales. No city or county in the Sacramento, Davis, Yolo, or Placer County region has adopted AB 1033 as of this writing. If you've read that this changes how you can finance or eventually cash out an ADU here, it doesn't, not yet, and we'd rather tell you that plainly than let the statewide headline mislead you about your specific city.
Worth watching: Sacramento's City Council placed AB 1033 adoption on its 2026 Planning and Zoning Work Program under Resolution 2026-0017, adopted January 27, 2026, with adoption hearings scheduled for Q3 2026. As of this writing, that's a scheduled hearing on the calendar, not an adopted ordinance, and hearings can be continued, amended, or voted down. Don't structure a financing plan around an anticipated future ability to sell your ADU separately until an ordinance actually passes. If it does, plan to see it announced through the city's planning department, and we'll update this post when it does.
Is There a Sacramento-Region-Specific ADU Financing Program?
We checked directly rather than assuming. The Sacramento Housing and Redevelopment Agency (SHRA) publishes financing and gap-funding programs, but those are structured for developers building or rehabilitating multifamily rental housing projects of 12 or more units, not individual homeowners adding a single ADU. We could not confirm an active, homeowner-facing ADU loan or grant program currently open through SHRA or another Sacramento-region public agency.
That's a deliberately unsatisfying answer, but publishing a dead or unconfirmed program as live is worse than saying plainly we didn't find one. If a city or county program launches, confirm it directly, SHRA's number is (916) 440-1390, before assuming it applies to your project.
Decision Framework: Which Product Fits Which Situation
None of this replaces underwriting, but it's a starting point for the conversation.
| Your situation | Products worth asking a lender about |
|---|---|
| Strong existing equity, want funds released as construction progresses | HELOC |
| Strong existing equity, want one fixed payment from day one | Home equity loan |
| Current mortgage rate is at or above today's market rate | Cash-out refinance worth exploring |
| Current mortgage rate is well below market, want to protect it | HELOC or home equity loan over cash-out refi |
| Limited current equity, but the ADU adds substantial projected value | Renovation loan (HomeStyle/CHOICERenovation) or construction-to-permanent loan |
| Credit profile may not clear conventional renovation-loan thresholds | Ask specifically about FHA 203(k) |
| Planning to use projected rental income to help qualify | Confirm current Fannie Mae ADU-income rules with your lender before assuming eligibility |
Every row in that table ends the same way: a conversation with a lender or mortgage broker who can run your actual numbers. We're happy to be part of that conversation from the construction side, at (530) 204-8294, but we're not the ones who can tell you which row you land in.
What This Actually Costs to Build
Financing decisions only make sense once you know the number you're financing. Using the region's established 2026 cost baseline:
| ADU Type | Construction Cost | All-In (permits, design, utility work) |
|---|---|---|
| JADU (shared bathroom, inside existing footprint) | — | $65,000-$95,000 |
| JADU (separate bathroom) | — | $100,000-$150,000 |
| Garage conversion | $60,000-$140,000 | $80,000-$160,000 |
| Attached ADU | — | $145,000-$260,000 |
| Detached ADU (standard) | — | $175,000-$340,000 (~$265-$380/sq ft) |
These are Sacramento-region planning ranges published consistently across our jurisdiction guides for Sacramento, Davis, Elk Grove, Folsom, Roseville, Woodland, West Sacramento, and Dixon, not a quote for your lot. Site conditions, utility distance, foundation type, and finish level all move the number.
Want a range built around your actual lot? Run the ADU cost calculator or get a free estimate at SafewayQuickQuote.com, about two minutes, no site visit required. That's the figure you bring to a lender; it isn't a substitute for what the lender tells you about what you can borrow.
For the full permit picture by city, see our Sacramento ADU guide and Davis ADU guide. Weighing a smaller unit? Our JADU vs. ADU comparison breaks down the cost and rule differences. Comparing pre-approved plan options to pin down a size, our pre-approved plans comparison covers Davis, Sacramento, Elk Grove, Dixon, Woodland, and West Sacramento side by side.
What We Deliberately Didn't Publish
We'd rather tell you what we don't know than print something that turns out wrong for your project.
- Specific interest rates for any product. They move week to week and vary by lender and credit profile; a published rate here would be stale before you finished reading.
- Whether you personally qualify for any specific loan program. That depends on your credit, income, existing mortgage, and debt-to-income ratio, outside our visibility or license to evaluate.
- A named lender recommendation. We're a general contractor; a lender relationship is one you should vet independently.
- A live Sacramento-region homeowner ADU grant or loan program. We looked and couldn't confirm one currently open. We'll update this post if that changes.
- Exact Fannie Mae/Freddie Mac guideline text. We described the current framework in plain language; the official Selling Guide is the authoritative source and updates periodically.
- Freddie Mac's May 4, 2026 CHOICERenovation cutoff as confirmed fact. Consistent across secondary sources, but Freddie's own primary fact sheet wasn't accessible to us. Presented as reported, not verified.
- 2026 FHA loan limit dollar figures. Reported consistently but not pulled directly from HUD.gov this pass, so we're leaving exact numbers out. Ask your 203(k) lender for your county's current limit.
Frequently Asked Questions
Is the $40,000 CalHFA ADU grant still available in 2026?
No. It's been closed to new applications since December 28, 2023, when the last funding round was fully allocated. CalHFA's own site still shows that notice, with no waitlist and no confirmed relaunch date.
What's the real difference between a HELOC and a renovation or construction loan for an ADU?
A HELOC or home equity loan lends against your equity today. A renovation loan or construction-to-permanent loan can lend against the home's projected value after the ADU is complete. That's why a homeowner with limited current equity can sometimes still finance a full build through the second category. Confirm eligibility with a lender, not a contractor.
Can I count my ADU's future rental income to help me qualify for financing?
Yes, under specific conditions, since Fannie Mae's Desktop Underwriter version 12.1 took effect March 21, 2026: capped at 30% of qualifying income, only 75% of the lesser of appraised or leased rent counts, purchase and limited cash-out refinance only, one ADU only, with a Form 1007 rent schedule required. FHA 203(k) uses a similar 75% figure for an existing ADU but around 50% for a new one. Confirm the current rule for your specific loan program with your lender.
Does AB 1033 change how I can finance an ADU in the Sacramento region?
Not yet. AB 1033 allows separate ADU sales only where a city or county has adopted a local ordinance, and as of 2026 that's limited to San Jose, Santa Monica, and unincorporated San Diego County. No Sacramento-region jurisdiction has adopted it, though Sacramento's City Council has adoption hearings scheduled for Q3 2026 (Resolution 2026-0017), not yet passed.
Is there a Sacramento-region-specific ADU loan or grant program for homeowners?
We could not confirm one currently active through SHRA or another regional public agency. SHRA's published financing programs target multifamily developers, not single-family ADU homeowners. Verify directly with SHRA at (916) 440-1390 before assuming a program applies to you.
Should I choose a HELOC or a fixed home equity loan for my ADU?
That's a lender question, but as a general pattern, a HELOC's draw structure tends to fit progress-based construction billing better than a lump-sum home equity loan. A fixed loan trades that flexibility for payment certainty. Ask a lender to model both against your specific project.
How much does an ADU cost to build in the Sacramento region in 2026?
A garage conversion runs $80,000-$160,000 all-in, an attached ADU runs $145,000-$260,000, and a standard detached ADU runs $175,000-$340,000, roughly $265-$380 per square foot. A JADU runs $65,000-$150,000 depending on bathroom configuration. Get a number for your lot at SafewayQuickQuote.com.
Who should I talk to before I pick an ADU financing option?
A lender or a licensed mortgage broker. We can give you an accurate construction cost range, which you need before shopping financing seriously. We can't tell you what you qualify to borrow, your rate, or whether a lender will count your rental income. That's underwriting, not construction.
Related Guides
- Sacramento ADU Guide: Permits, Costs and EZPermit (2026)
- Davis ADU Guide: Permits, Costs and the City's Free Pre-Approved Plans (2026)
- Davis ADU Rental Income 2026: Will It Actually Pay for Itself?
- JADU vs. ADU in Sacramento and Davis: The 2026 Owner-Occupancy Rules
- Sacramento-Region Pre-Approved ADU Plans Compared (2026)
Get the Build Number, Then Talk to a Lender
We're a licensed California general contractor (CA Lic. #1066117) with 20+ years of construction experience across California and a 5.0-star Google rating. We have a project manager on the ground in the Davis and Sacramento region, and we can tell you exactly what your ADU is likely to cost, itemized and specific to your lot. What we're not, and won't pretend to be, is a lender, that conversation belongs with a mortgage broker or bank loan officer who can pull your credit, income, and existing mortgage into an actual underwriting decision.
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