Blog
Expert insights, regulatory updates, and practical guides for your ADU project.
California's 16-foot ADU height ceiling fits a tight 2-story stacked build but stalls most over-garage projects. 2026 rules across 4 cities.
HCD's January 2026 letter flagged six violations in Sacramento's ADU ordinance. Here's what's wrong and how to spot it in your city's code.
Building an ADU doesn't change your school zone. What actually determines enrollment in California — and what the $5.38/sqft school fee buys.
SB 1117, SB 1196, AB 1738, AB 2601 are still moving in California's 2026 session. Here's how to decide whether your ADU should break ground now or wait.
Washington's HB 1345 lets GMA counties allow one rural ADU per parcel, capped at 1,296 sq ft within 150 feet. Effective June 11, 2026.
AB 253 lets you hire a private plan checker when your ADU permit stalls past 30 business days. How it works, what it costs, and why nobody has used it yet.
San Francisco forces ~90% of new ADU owners to sign away their Costa-Hawkins protection through Planning Code waivers. The result: a 1.6% annual rent cap that erodes real cash flow within a decade. Here's what the numbers look like compared to San Diego.
SB 1164's ADU property tax exclusion died in 2024 and has not been reintroduced. Here is what Prop 13 actually gives California ADU owners today — and what to ask your county assessor before you build.
Building an ADU on a pre-1978 home in LA, SF, or Oakland can trigger rent control on your primary house. Plus, every California ADU loses its AB 1482 new-construction exemption after 15 years. Here are the two rent control traps ADU owners need to understand.
San Jose led California's ADU revolution with the first AB 1033 condo sale, but 40,000 parcels in new SB 79 transit zones, a 62,200-unit RHNA gap, and lending bottlenecks could reshape what homeowners build next. Here are five policy shifts to watch through 2028.
San Jose allows detached ADUs with 4-foot setbacks, two-bedroom layouts up to 1,200 sq ft, and completed California's first AB 1033 condo sale in August 2025. Here is what the 2026 rules actually say, what an ADU costs to build, and how the condo option changes the investment math.
Oregon's rural ADU law requires 2 acres minimum. If your coastal lot is smaller, here's what the law actually says and what alternatives exist.
NJ's ADU bill passed the Senate 35-1 and died in the Assembly. Only 8 towns allow ADUs locally. What homeowners can do now.
AB 1154 removed JADU owner-occupancy requirements for units with independent bathrooms. Here is what 'sanitation facilities' actually means, the 30-day rental floor, and why your existing JADU may already qualify.
NYC legalized ADUs in 2024, but 88% of lots are excluded. Our interactive map shows which neighborhoods qualify under Local Law 127.
California coastal ADU guidance under SB 1077: what the April 2026 draft covers, why 76 coastal jurisdictions still need LCP updates, and how to comment by May.
VHFHSZ adds $13,000–$50,000 to build costs and up to $6,800/year in FAIR Plan insurance. Whether a California fire zone ADU still pencils out in 2026.
A Stanford/MIT study found 78% of San Jose's new ADUs are unpermitted. AB 2533 creates a statewide amnesty for pre-2020 units — no fines, no impact fees, inspections focused on safety not full code. Here is who qualifies, what it costs, and why your lender cares.
Prefab ADU base prices look cheap until you add foundation, crane, utilities, and permits. Here is a line-by-line cost comparison, real manufacturer prices, and a 5-question checklist to decide which build method fits your property.
SB 1211 raised the detached ADU cap on existing multifamily lots from 2 to 8 and eliminated replacement-parking requirements for uncovered spaces. Here is how the math works, what stacks with it, and what apartment owners should do next.
Most California ADU owners skip address assignment. Here is why that creates problems for 911 dispatch, mail delivery, insurance claims, and future condo conversion, plus a city-by-city guide to getting your ADU its own address.
San Diego adopted 25 ADU amendments for 2026, expanding its density bonus program while restricting ADUs on dead-end streets in fire zones. Covers Zone 0, VHFHSZ costs, sprinkler rules, and the SD vs LA policy split.
California's SB 543 15-day completeness clock and SB 9's compliance hammer end city stalling on ADU permits. Learn your enforceable rights and what to do if your city misses the deadline.
California law prohibits cities from requiring replacement parking when you convert a garage to an ADU. Here is exactly what the law says, the one exception that still exists, and the LA driveway gray area nobody talks about.
Every ADU financing option in California compared: HELOC, ARV HELOC, cash-out refi, construction loans, FHA 203(k), HomeStyle Renovation, and government programs. Includes 2026 Fannie Mae ADU income rules, real monthly payment math, and the appraisal gap nobody warns you about.
A complete legal guide for California homeowners facing HOA resistance to ADU construction. Covers Civil Code §4751, the planned development vs condominium distinction, Eng v. Opperman, AB 3182 rental protections, and a step-by-step action plan when your HOA says no.
Can a 400 sq ft garage become a 1-bedroom ADU? Code minimums, three floor plans, the wet wall rule, costs, and 5 mistakes to avoid.
JADU vs Attached ADU at 500 sq ft in California: side-by-side comparison of 2026 regulations, construction costs, impact fees, property taxes, rental income, and ROI. Includes the 499 sq ft rule and 1+1+1 stacking strategy.
California ADU laws in 2026: SB 543 permit timelines, impact fee exemptions, coastal rules, JADU changes, and what homeowners must know.
Everything California homeowners need to know about ADU impact fees in 2026. Two size thresholds, six city comparisons, and the legal strategies that save thousands.
NYC passed City of Yes to allow ADUs, but the state-level Multiple Dwelling Law remains untouched. We verified 40+ sources to answer the question every brownstone owner is asking: does the new law make 2-to-3-family conversion any easier?
A .38-acre Fontana lot can hold up to 3 rental units under current ADU rules. With construction costs 15-30% below coastal California and a 7% cap rate (9% with CalHFA grant), the investment math works — but only if you account for financing costs, sewer fees, and the short-term rental ban that most guides skip.
California's SB 543 (effective Jan 1, 2026) makes ADU rules more enforceable, unlocks clearer multi-ADU pathways, and pairs with SB 9 in powerful ways. This guide also maps the rise of machine-readable zoning systems that are changing feasibility workflows.
The most valuable information about ADU construction isn't what builders tell you — it's what they don't. These 13 counterintuitive truths represent the gap between marketing promises and construction reality in California.
Your $200K+ ADU may only have $25K in coverage. Learn how California insurers classify ADUs, which policy types actually protect you, and what to say when you call.
Full 2026 briefing on how AB 1033's condo-conversion opt-in works for architects, investors, and homeowners across California.
AB 462 cuts coastal ADU permit timelines from months to 60 days, eliminates Coastal Commission appeals, and creates post-disaster occupancy rules. Complete breakdown for California homeowners and architects.
SB 543 reshapes California ADU permits in 2026: 60-day approval timelines, impact fee exemptions for units under 750 sq ft, and new JADU rules. What homeowners and architects must know.
What California architects need to know about the 2025 Title 24 code cycle for ADU fire, structural, energy, CALGreen, and permitting compliance.
洛杉矶某single family house山坡住宅的ADU法规约束、风险评估与建设方案对比。
ADU de casa unifamiliar en ladera de Los Ángeles - Regulaciones legales, evaluación de riesgos y comparación de opciones de construcción.
Análisis integral de viabilidad para la construcción de ADU en una casa unifamiliar de San José, incluyendo requisitos de zonificación, condiciones del sitio, opciones de diseño y estimaciones de costos.
Comprehensive feasibility analysis for ADU construction at a San Jose single-family home, including zoning requirements, site conditions, design options, and cost estimates.
圣荷西某独栋住宅的ADU建设可行性分析，包含法规要求、场地条件、设计方案及成本预算。
Complete expert guide for California homeowners considering an ADU. Learn about regulations, costs, financing, approval processes, and local requirements with verified sources.
