Finance · 11 min read · May 30, 2026 · 443 words
ADU construction financing in 2026: HELOC, renovation loan, and the new construction-to-perm landscape
How LA and Bay Area homeowners are actually funding ADU builds in 2026 — HELOCs at 8.25–9.5%, renovation loans, construction-to-permanent products, and the new Freddie Mac CHOICERenovation guidance that opened up ADU financing.
Key takeaways
- HELOC vs renovation loan: [financing comparison](/guides/adu-financing-heloc-vs-renovation-loan)
- Run the financing math: [financing calculator](/financing-calculator)
- Run the rental math: [ROI calculator](/roi-calculator)
Answered in this guide
Jump straight to the question you came in with — every answer is on this page, with links onward to the deeper guide.
- What kind of return on investment can I expect?
- Are there grants or rebates available?
- What does an ADU cost in LA?
- What's included in your turnkey number?
- Will building an ADU raise my property taxes?
- Can I rent my ADU on Airbnb?
More across the studio · the full FAQ map · the reference desk
ADU financing in 2026 looks dramatically different than in 2022. Rates are off the post-Fed peak but still above the cheap-money era, and lenders have built specialized ADU products. This guide walks the four real options homeowners are using in 2026 — HELOC, cash-out refi, renovation loan, and construction-to-perm — and the math on each. Pair it with the HELOC vs renovation loan deep dive and the ROI calculator.
1. HELOC: still the workhorse
HELOCs remain the most common ADU funding source in 2026. Rates run 8.25–9.5% APR on Prime + 0.25–1.0%, with 10-year draw and 20-year repayment. The pitch: variable rate, interest-only during the draw, and most lenders can fund a $200K–$300K line in 3–5 weeks. The trap: rate risk if Fed cuts stall, and HELOCs are second-lien — primary-mortgage refinances later get more complicated.
2. Cash-out refi: only if your primary rate is bad
If your primary mortgage is at 6.5%+ from a 2023–2024 purchase, a cash-out refi may pencil. If you locked at 2.75% in 2020–2021, do not refinance — use a HELOC or renovation loan instead. The opportunity cost of giving up a sub-3% first lien is roughly $1,200–$1,800/mo per $300K of mortgage at today's rates.
3. Renovation loan (FHA 203(k), Fannie HomeStyle, Freddie CHOICERenovation)
Renovation loans bundle the construction cost into a new first mortgage based on as-completed value. They're cheaper than a HELOC long-term (~7.5–8.25% in 2026), but underwriting takes 8–12 weeks and requires a HUD consultant on FHA 203(k). Freddie Mac's 2024 CHOICERenovation update explicitly named ADUs as eligible improvements — major unlock for Bay Area projects where ADU value can exceed loan limits without it. See the HELOC vs renovation comparison.
4. Construction-to-permanent
A handful of California lenders (Patelco, Provident, Tri Counties Bank) now offer construction-to-perm products specifically marketed for ADUs. The structure: interest-only during the 9–14 month construction phase, then converts to a 30-year fixed mortgage on as-completed value. Rates run 8.0–8.75% in 2026. The advantage: one closing, one set of fees. The disadvantage: tighter draw schedule and more lender oversight during construction.
Pairing the financing with the build
Most homeowners we work with use HELOCs for builds under $250K and renovation loans for builds above $300K — the breakpoint is roughly where origination cost amortizes against the rate savings. Run your scenario on the financing calculator and the ROI calculator. The property tax reassessment guide covers the carrying-cost side that financing alone does not.
Anchor links
- HELOC vs renovation loan: financing comparison
- Run the financing math: financing calculator
- Run the rental math: ROI calculator
- Cost stack: cost breakdown · LA cost anatomy
Sources
- Freddie Mac CHOICERenovation · Freddie Mac
- Fannie Mae HomeStyle Renovation · Fannie Mae
Next chapter · 01 of 02
Finance · 9 min read
HELOC, cash-out, renovation loan: the ADU money decision
Once you see the 2026 product landscape, the HELOC vs renovation deep dive is where to land your specific financing choice.
A practical comparison of the four ways LA homeowners actually pay for an ADU — including the one product (renovation loan) that lets you borrow against the finished value.
FAQ · Finance
Common questions on finance
The questions readers send us most after this guide.
What kind of return on investment can I expect?
Across 120+ completed LA projects, our owners see 10–16% annual return on construction cost in long-term rental. The math: a $280K detached ADU renting at $2,800/month grosses $33,600/year — roughly a 12% gross yield before expenses. Property value uplift is typically 1.4–1.7× the build cost on appraisal.Are there grants or rebates available?
The CalHFA ADU Grant Program ($40K toward soft costs) was paused in 2023 but a successor is in late-stage legislative drafting. LADWP offers rebates for high-efficiency HVAC and induction cooktops. We track every active program and apply on your behalf.What does an ADU cost in LA?
Pricing depends on size, finish level, and site conditions. For 2026, our detached ADUs start around $250K for a 480 sq ft studio and run up to about $480K for a 1,200 sq ft custom build. Garage conversions begin around $145K. JADUs typically run $95K–$140K.What's included in your turnkey number?
Architectural and structural design, Title 24 energy compliance, full permit fees and plan check, soils report when required, foundation, framing, MEP rough-in, insulation, drywall, doors, windows, kitchen, bathroom, flooring, paint, fixtures, and final cleaning. Excluded: landscaping beyond grading, solar (offered separately), and LADWP service upgrades when the existing panel can't carry the load.Will building an ADU raise my property taxes?
Only the ADU portion is reassessed at its construction cost — the existing main house keeps its Prop 13 basis. On a typical $280K ADU, expect a property tax increase of roughly $2,800/year at LA's 1% rate plus local assessments.Can I rent my ADU on Airbnb?
Short-term rentals (under 30 days) are restricted in the City of Los Angeles to your primary residence and require Home-Sharing Ordinance registration. ADUs built after 2017 are generally ineligible for STR registration. Long-term rentals (30+ days) are permitted in nearly all jurisdictions without restriction.
Reference desk · Finance
More answers from the California reference desk
City-specific questions pulled from our 5,000-answer FAQ corpus — every link opens a deeper desk page.
What financing options work best for a ADU in Beverly Hills?
Four paths cover almost every Beverly Hills ADU: (1) HELOC if you have 30%+ equity and want flexibility, rates 8.0–9.5%; (2) cash-out refinance if your existing rate is above 6.75%; (3) renovation loan (Fannie HomeStyle / FHA 203k) that funds against future appraised value — useful when current equity is thin; (4) construction-to-perm if the scope is over $200K. CalHFA ADU grants of up to $40K are exhausted but the program may renew — check before assuming.What ROI should I expect from a ADU in Beverly Hills?
A rented ADU in Beverly Hills typically produces 9–12% cash-on-cash return after operating costs — driven by $3,400/mo for a one-bedroom and $4,800/mo for a two-bedroom at current Beverly Hills rents. Run the math on $165K as a baseline and your specific size and finish on top.How much cash do I need upfront for a ADU in Beverly Hills?
Most homeowners in Beverly Hills fund 15–25% in cash and finance the rest. On a project starting at $165K, that's roughly $25K–$45K of liquid funds for design, permits, deposits, and the first draw before the construction loan starts cycling. Reserve an additional 8–12% contingency you don't touch unless triggered.Will a ADU appraise for what I spent in Beverly Hills?
In Beverly Hills, ADU appraisals typically recognize 70–95% of construction cost in added value, with the rest captured through rental income on the income-approach side. The comp pool matters more than the spec — three similar nearby transactions in the last 6 months drive the appraisal more than any single material choice.Is a ADU in Beverly Hills tax-deductible?
Construction on your primary residence is not directly deductible on federal taxes. Three indirect paths matter: (1) HELOC or refi interest on funds spent improving the home is deductible up to the $750K mortgage cap; (2) capital improvements add to your cost basis and reduce capital gains at sale; (3) energy-efficiency upgrades (heat pump, insulation, solar) qualify for federal IRA tax credits through 2032. Consult a CPA on your specific Beverly Hills property tax exposure.What financing options work best for a garage conversion in Beverly Hills?
Four paths cover almost every Beverly Hills garage conversion: (1) HELOC if you have 30%+ equity and want flexibility, rates 8.0–9.5%; (2) cash-out refinance if your existing rate is above 6.75%; (3) renovation loan (Fannie HomeStyle / FHA 203k) that funds against future appraised value — useful when current equity is thin; (4) construction-to-perm if the scope is over $200K. CalHFA ADU grants of up to $40K are exhausted but the program may renew — check before assuming.What ROI should I expect from a garage conversion in Beverly Hills?
A rented garage conversion in Beverly Hills typically produces 9–12% cash-on-cash return after operating costs — driven by $3,400/mo for a one-bedroom and $4,800/mo for a two-bedroom at current Beverly Hills rents. Run the math on $165K as a baseline and your specific size and finish on top.How much cash do I need upfront for a garage conversion in Beverly Hills?
Most homeowners in Beverly Hills fund 15–25% in cash and finance the rest. On a project starting at $165K, that's roughly $25K–$45K of liquid funds for design, permits, deposits, and the first draw before the construction loan starts cycling. Reserve an additional 8–12% contingency you don't touch unless triggered.Will a garage conversion appraise for what I spent in Beverly Hills?
In Beverly Hills, ADU appraisals typically recognize 70–95% of construction cost in added value, with the rest captured through rental income on the income-approach side. The comp pool matters more than the spec — three similar nearby transactions in the last 6 months drive the appraisal more than any single material choice.Is a garage conversion in Beverly Hills tax-deductible?
Construction on your primary residence is not directly deductible on federal taxes. Three indirect paths matter: (1) HELOC or refi interest on funds spent improving the home is deductible up to the $750K mortgage cap; (2) capital improvements add to your cost basis and reduce capital gains at sale; (3) energy-efficiency upgrades (heat pump, insulation, solar) qualify for federal IRA tax credits through 2032. Consult a CPA on your specific Beverly Hills property tax exposure.What financing options work best for a JADU in Beverly Hills?
Four paths cover almost every Beverly Hills JADU: (1) HELOC if you have 30%+ equity and want flexibility, rates 8.0–9.5%; (2) cash-out refinance if your existing rate is above 6.75%; (3) renovation loan (Fannie HomeStyle / FHA 203k) that funds against future appraised value — useful when current equity is thin; (4) construction-to-perm if the scope is over $200K. CalHFA ADU grants of up to $40K are exhausted but the program may renew — check before assuming.What ROI should I expect from a JADU in Beverly Hills?
A rented JADU in Beverly Hills typically produces 9–12% cash-on-cash return after operating costs — driven by $3,400/mo for a one-bedroom and $4,800/mo for a two-bedroom at current Beverly Hills rents. Run the math on $165K as a baseline and your specific size and finish on top.
Sources & further reading
- California Government Code §65852.2 — statewide ADU framework (ministerial review, 60-day clock).
- LADBS — Accessory Dwelling Unit information bulletins and current permit fee schedule.
- HCD — California Department of Housing & Community Development, ADU handbook (2024 update).
- Internal data: 120++ ADU projects delivered across Los Angeles County, 2018–2025.
Continue your read · the editorial path
We chained these chapters in the order LA homeowners actually need them. Each one picks up where the last one left a question open.
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