Question 1

What permits are required to build an ADU in California?

Accepted Answer

Every Accessory Dwelling Unit in California requires a building permit — there is no size or type exemption, even for a small studio or a JADU carved out of an existing bedroom. The building permit is the master approval that triggers plan review and bundles together the structural, electrical, plumbing, mechanical, and energy-compliance scopes. Around that core permit sit several other approvals you should understand before you submit.The permits and approvals in a typical ADU packageBuilding permit — the primary permit covering the ADU structure and all building systems. This is what plan check reviews and what your inspector references at each construction stage.Planning / zoning approval — ADUs are approved ministerially in California, meaning no public hearing and no discretionary design review as long as the project meets objective zoning standards (setbacks, height, lot coverage). Staff-level zoning review usually runs concurrently with the building permit.Electrical, plumbing, and mechanical permits — depending on the city, these are either separate trade permits pulled by your licensed electrician (C-10), plumber (C-36), and HVAC contractor (C-20), or they are reviewed as scopes folded into the single building permit.Title 24 energy documentation — a registered CF1R is submitted with the building permit application; without it the application is incomplete. See Title 24 Reports.Utility service applications — separate from the building permit. Water, sewer, gas, and electric service requests are filed with your utility (PG&E, SCE, SDG&E, LADWP, or your local water/sewer district) and run on their own timelines.Why the distinction matters for your scheduleThe 60-day statutory review clock under California law applies to the building permit once a complete application is on file. Utility coordination is a completely separate track and is frequently the longest item on the project schedule — a panel upgrade or new service connection can take weeks to months depending on the provider. The single most common scheduling mistake we see is starting utility coordination only when construction is nearly finished. Start it the same week you submit for permit.What does not require a separate permitUnder recent state reforms, cities must process certain related work as part of the ADU permit rather than as standalone permits. For example, removing a garage door and closing the opening for a garage conversion is handled within the ADU building permit, not a separate demolition permit. Requirements and local ordinances vary by jurisdiction, and ADU law changes frequently — confirm the exact permit bundle with your local building department before you file.A practical pre-submittal checklistConfirm your lot is zoned for an ADU and identify setback, height, and size limits.Have architectural, structural, and MEP plans prepared and coordinated.Obtain a registered Title 24 CF1R for your climate zone.Open utility service requests early.Submit a complete package so you pass the completeness review and start the 60-day clock immediately.If you want the engineering portion handled correctly from the start, our Full MEP Package delivers permit-ready mechanical, electrical, and plumbing sheets coordinated with your architectural set. See the California ADU permit guide for the full process.

Question 2

What documents must be included in a California ADU permit application?

Accepted Answer

A complete California ADU building permit application is essentially a coordinated package of drawings, calculations, and forms that lets the plan checker verify the project meets the building, energy, and zoning codes. Submitting a complete package matters more than almost anything else, because completeness is what starts the statutory review clock and keeps your project out of the incomplete-notice loop.Core documents nearly every city requiresSite plan — the property boundary, all existing structures, the proposed ADU location, setbacks to property lines, and the routing of water, sewer, gas, and electric service.Architectural plans — floor plan with dimensions, exterior elevations, and building sections.Structural plans — foundation and framing details, with engineer-stamped calculations where the scope requires them.MEP plans — separate mechanical, electrical, and plumbing sheets, including load calculations, equipment schedules, and DWV layout.Title 24 CF1R — the energy compliance certificate, registered with an Energy Code Compliance (ECC) Provider, not just a PDF. See Title 24 Reports.Permit application form — the city's intake form, fully completed.Owner authorization — required when a contractor, designer, or agent submits on the owner's behalf.City-specific extras to budget forBeyond the core set, many jurisdictions ask for additional items depending on site conditions:A soils / geotechnical report in hillside areas or where expansive soils are present.A landscape or stormwater plan, sometimes tied to lot coverage or drainage requirements.A green building / CALGreen compliance form.City-specific ADU disclosure or acknowledgment forms.A sewer capacity or will-serve letter from the water/sewer district in some areas.Why completeness is the whole gameUnder California law, once you submit, the city has a short window to review the application for completeness and tell you exactly what is missing. A package that passes that completeness check enters plan check immediately and starts the 60-day decision clock. A package missing the Title 24 CF1R, a load calculation, or a coordinated MEP set triggers an incomplete notice — and you restart the intake cycle, losing weeks.The fastest permits we see are not the ones rushed out the door; they are the ones submitted complete the first time, with MEP and Title 24 already reconciled to each other.Document checklist before you submitSite plan with setbacks and utility routingArchitectural plans (floor plan, elevations, sections)Structural plans and calculationsMechanical, electrical, and plumbing sheets with calculations and schedulesRegistered Title 24 CF1R for the correct climate zoneCompleted application form and owner authorizationAny city-specific reports or disclosure formsRequirements and local ordinances vary by jurisdiction — confirm your city's exact submittal checklist before filing. To get the MEP and Title 24 pieces delivered together and pre-coordinated, see our Full MEP Package or place an order.

Question 3

What is the 60-day rule and how does it protect ADU applicants?

Accepted Answer

The "60-day rule" is a statutory protection in California's ADU law requiring a permitting agency to approve or deny a complete ADU application within 60 calendar days of receiving it. It exists because, before statewide ADU reform, applicants could wait many months — sometimes more than a year — for a decision. The Legislature put a hard deadline in the Government Code (provisions including sections 66317 and 66320) to stop that.How the clock actually startsThe 60 days run from receipt of a complete application — not from the day you first walk in the door with a partial set. This is why completeness is so important. A package missing the Title 24 CF1R, a load calculation, or coordinated MEP sheets gets an incomplete notice, and the clock does not start until you cure the deficiency. Submitting a clean, complete package is the single best way to make the 60-day protection work for you.The newer 15-day completeness clockEffective January 1, 2026, SB 543 adds a 15-business-day completeness review: the city must review your submittal and notify you of any missing items within 15 business days. If the city fails to act within that window, the application is treated as complete by operation of law. This closes a loophole where agencies could slow-walk projects by never formally accepting them as complete. Pre-approved plan programs can shorten the decision timeline further — some to roughly 30 days.What "deemed approved" meansIf the agency does not act on a complete application within 60 days, the application is deemed approved by operation of law. This is a genuine legal protection, not a courtesy guideline. In practice, you rarely want to rely on automatic approval — it can create title and inspection complications — but its existence gives you real leverage.The 60-day rule is most powerful as a negotiating tool: a polite, written reminder that the statutory deadline is approaching usually moves a stalled file far faster than an automatic-approval claim ever would.How to use the protection effectivelySubmit complete. A complete package starts the clock and avoids the incomplete-notice reset.Document your submittal date and keep the intake confirmation.Respond to corrections promptly. Correction rounds can pause or affect the timeline, so a fast, complete response keeps momentum.Send a written reminder as the 60-day mark approaches if no decision has issued, citing the statutory timeline.Escalate in writing to a supervisor or the ADU ombudsperson if the deadline passes without action.An important caveatThe 60-day rule governs the city's building permit decision. It does not control utility timelines — a panel upgrade or new service connection runs on the utility's schedule and can take far longer. The rule also assumes objective, ministerial review; it is not a way to override legitimate health-and-safety code requirements. Requirements and local ordinances vary by jurisdiction, and these timelines were tightened by recent legislation — confirm the current rules with your local building department. To avoid the corrections that eat into your 60 days, start with permit-ready, coordinated plans via our Full MEP Package or read the permit guide.

Question 4

How does the ADU permit process work in Los Angeles specifically?

Accepted Answer

Los Angeles processes the highest volume of ADU permits in California, and the Los Angeles Department of Building and Safety (LADBS) has built dedicated programs and an electronic plan-review system to handle that demand. If you are building in the City of Los Angeles, knowing how those programs work — and where projects get stuck — can save weeks.The ADU Standard Plan ProgramLADBS maintains a library of pre-approved ADU standard plans that property owners may use, often at no cost for the architectural design itself. Using a pre-approved plan removes the architectural and structural review from the critical path because those elements were already vetted. What you still need, however, is a project-specific MEP set and a registered Title 24 CF1R tied to your exact parcel and climate zone — the standard plan does not include site-specific mechanical, electrical, and plumbing engineering or your energy compliance documents.ePlanLA — electronic plan reviewLos Angeles runs plan check through ePlanLA, its electronic submittal and review portal. Plans are uploaded as PDFs formatted for 24" x 36" sheets, reviewers mark up the set digitally, and corrections come back through the same system. This eliminates physical plan printing and courier trips, but it also means your PDFs must be properly formatted and your sheets clearly labeled (M-1, E-1, P-1, and so on) so the digital reviewer can navigate them. Our plans are delivered ready for ePlanLA and other California e-review portals.A realistic timelineFor a custom ADU in Los Angeles that is not using a pre-approved plan, expect roughly 4 to 8 weeks for initial plan review in the 2025-2026 environment, plus additional time for each correction round and resubmittal. Pre-approved-plan projects move faster. The statutory decision deadlines still apply, but high application volume means well-prepared, correction-free submittals clear noticeably faster than the average.Where LA projects commonly stallElectrical service capacity — LADWP service coordination is separate from the LADBS permit and can be a long pole, especially when a panel upgrade or new service is needed.All-electric requirements — Los Angeles has adopted reach-code provisions affecting gas in new construction; your mechanical and plumbing designs must reflect that.MEP corrections — missing load calculations, absent GFCI/AFCI notation, or DWV venting not shown are frequent correction items.Title 24 mismatches — the CF1R and the MEP equipment must agree, or the set comes back.Practical advice for an LA ADUDecide early whether a pre-approved standard plan fits your lot.Open your LADWP service request as soon as you start the permit, not at the end.Submit a complete ePlanLA package with coordinated MEP and a registered CF1R.Respond to every ePlanLA correction comment specifically and completely to avoid extra rounds.Los Angeles requirements and ordinances change frequently — confirm current LADBS and LADWP procedures before you file. Because we prepare California-specific, ePlanLA-ready drawings and include city corrections at no additional charge, ordering our Full MEP Package removes a major source of LA correction cycles. See how it works to get started.

Question 5

What is an owner-builder permit and when can it be used for an ADU?

Accepted Answer

An owner-builder permit lets a California property owner act as their own general contractor — pulling permits, hiring and coordinating licensed subcontractors, and taking legal responsibility for code compliance — without holding a contractor's license. For ADU owners willing to manage their own project, it can save the general contractor's markup. It also carries real obligations, so it is worth understanding precisely what it does and does not allow.What owner-builder status lets you doPull the building permit in your own name as the responsible party.Hire licensed trade subcontractors and coordinate the schedule yourself.Perform certain work yourself where local rules permit, subject to inspection.Key limitations to understand before you filePrimary residence requirement. Owner-builder permits are intended for the owner's own property and generally not for units built to immediately sell. Confirm how your jurisdiction treats an ADU on owner-occupied property.Licensed trades still required. Even as owner-builder, electrical work is performed by a licensed electrician (C-10), plumbing by a licensed plumber (C-36), and HVAC by a licensed mechanical contractor (C-20). Owner-builder status does not let you ignore trade licensing for the systems that protect life safety.Full code compliance and inspections. Every stage — rough-in and final for each trade — must pass inspection exactly as a contractor-built project would.Liability and labor responsibility. As owner-builder you assume responsibility for safety, and if you hire workers directly you may take on employer obligations such as workers' compensation. Many owners hire only licensed subs precisely to limit this.When owner-builder makes sense for an ADUIt tends to work well when the owner is organized, has time to manage a project, and is building on a property they occupy. A detached new ADU or a garage conversion are both common owner-builder projects. It tends to not make sense when the owner cannot be on site to coordinate, when the project is an investment build intended for quick sale, or when the complexity (hillside foundation, major utility upgrades) really warrants a seasoned general contractor.Owner-builder is a project-management role, not a license to self-perform the regulated trades. The owners who succeed treat it as coordinating licensed professionals, not replacing them.Where MEP plans fit inAn owner-builder still needs the same permit-ready documents as any other applicant — including coordinated mechanical, electrical, and plumbing sheets with load calculations and a registered Title 24 CF1R. Good plans are arguably more valuable to an owner-builder, because they are the blueprint your licensed subs install from and the reference the inspector checks at each stage. Many owner-builders order our Full MEP Package so the engineering is handled correctly and city corrections are included.Owner-builder rules and licensing thresholds vary by jurisdiction and change over time — confirm the current requirements with your local building department and the Contractors State License Board before filing.

Question 6

What impact fees are charged and what is waived for ADUs?

Accepted Answer

Fees are one of the most misunderstood parts of ADU budgeting, partly because California law waives some of them and partly because the fees that aren't waived — utility connection charges in particular — can be surprisingly large. It helps to separate the categories clearly.Impact fees and the small-ADU waiverUnder California ADU law, ADUs below a defined size threshold are exempt from local impact fees — the development fees cities charge to fund parks, roads, and other infrastructure tied to new units. Larger ADUs above the threshold may be charged impact fees, and those fees are generally required to be proportional to the unit's size relative to the primary dwelling rather than charged at the full single-family rate. The exact threshold, exemption criteria, and proportionality rules vary by jurisdiction — verify current requirements with your building department.The fees that are not waivedFee typeTypically waived for small ADUs?NotesLocal impact feesOften yes, below the size thresholdLarger ADUs may pay proportional feesUtility connection fees (water/sewer)NoCharged by the district regardless of size; can be very largeSchool impact feesSometimes, depends on size/districtCharged by the school district above certain thresholdsPermit / plan-check feesNoThe city's cost to review and issue the permitUtility connection fees — the big variableWater and sewer connection (capacity) fees are explicitly outside the impact-fee waiver and are set by your water/sewer district, not the city. These can range from a few hundred dollars to well over $15,000 depending on the district and whether a new service or larger meter is required. This is the line item most likely to blow up an ADU budget, so confirm it with your district early — before you finalize your plumbing design and before you commit financially.School and permit feesSchool fees — many districts charge a per-square-foot fee on new residential area above a threshold; amounts and thresholds vary widely and change over time. Verify with your specific district.Permit and plan-check fees — the city's own charge for reviewing and issuing the permit. These are separate from impact fees and are not waived; they commonly run anywhere from roughly $1,500 to $15,000 depending on the city and project scope.A budgeting checklistAsk your city for its current ADU impact-fee schedule and the size threshold for the waiver.Ask your water and sewer districts for connection/capacity fees in writing.Confirm whether school fees apply at your ADU's square footage.Get the city's permit and plan-check fee estimate.Add all four categories to your construction and design budget.Many homeowners assume "ADU fees are waived" and are blindsided by a five-figure water connection charge. The waiver is real, but it is narrow — connection and permit fees usually are not covered.Fee rules and thresholds change frequently and vary by jurisdiction — confirm everything with your local building department and utility districts before committing. For a clear picture of the design-side costs you can control, see our cost of ADU MEP plans page and our flat pricing.

Question 7

Can I build two ADUs on my California property?

Accepted Answer

In most cases, yes — California's statewide ADU law is intentionally generous about allowing additional units, and on many properties you can add more than one. The exact combination depends on whether your lot is single-family or multifamily and on any additional allowances your local jurisdiction provides.Single-family lots: one ADU plus one JADUOn a typical single-family lot, state law allows one ADU and one JADU (Junior ADU, up to 500 SF created within the existing home). That means a homeowner can often have the main house, a detached or attached ADU, and a junior unit converted from a bedroom or attached space — three independent living arrangements on one lot. Some cities go further under their local ordinances and permit additional ADUs, so it is worth checking your specific jurisdiction.Multifamily lots: substantially moreOn lots with existing multifamily buildings, the allowances expand significantly. Under SB 1211 (enacted in 2025), eligible multifamily properties may add up to eight detached ADUs, subject to conditions such as not exceeding the number of existing units and meeting setback and height standards. Multifamily lots also have separate provisions for converting non-livable interior space (storage rooms, attached garages) into ADUs. The precise count and conditions vary — confirm current applicability with your local jurisdiction.What multiple units mean for MEP designEach ADU is its own complete, independent dwelling and therefore requires its own building permit and its own MEP plan set — you cannot reuse one unit's plans for another, because each references a specific floor plan, location, climate zone, and utility configuration. Building multiple units on one property also raises capacity questions the design team must resolve:Electrical — can the existing service feed multiple new subpanels, or is a service upgrade or separate metering required? A load calculation for the whole property answers this.Plumbing — does the existing sewer lateral and water service have capacity for multiple added units, or are new connections needed?Gas / all-electric — local reach codes may push multiple units toward all-electric, affecting both mechanical and plumbing design.The constraint on multiple ADUs is rarely the zoning allowance — it is usually utility capacity. Plan the electrical service and sewer/water connections for all units together, up front, rather than discovering a shortfall on the second build.A practical approachConfirm your lot type (single-family vs. multifamily) and the unit count your jurisdiction allows.Have your design team evaluate total electrical, water, and sewer capacity for all proposed units.Budget a separate MEP set and permit for each unit.Open utility service requests early, since multiple units are more likely to trigger upgrades.ADU unit-count rules changed materially with recent legislation and vary by jurisdiction — verify current requirements with your local building department. When you are ready to engineer each unit, our Full MEP Package covers all three disciplines per unit, and our pricing is flat by square footage. See the California ADU requirements page for more.

Question 8

What is the ADU amnesty law and how does it affect MEP plans?

Accepted Answer

The ADU "amnesty" law refers to California's legalization pathway for unpermitted ADUs. AB 2533 (effective in late 2025) makes it substantially easier to bring an existing, previously unpermitted accessory unit into legal status, and it has direct implications for how MEP plans are prepared for these projects.What the amnesty law doesFor unpermitted ADUs built before January 1, 2020, AB 2533 limits a city's ability to deny legalization. Cities cannot deny a permit based on building-standard violations alone — they must allow the unit to be legalized as long as it does not present an imminent health-and-safety hazard. In other words, the goal is to fix and document non-compliant systems, not to force demolition of otherwise sound units. This brings many "shadow" units out of the unpermitted gray market and into a path where they are inspected, corrected, and recognized.Why MEP is central to legalizationUnpermitted ADUs were, by definition, never inspected — so the active systems are where the violations concentrate. Plumbing tends to be the worst offender: in assessments of unpermitted units, a large majority showed plumbing deficiencies. Common problems include:Improper or missing drain venting (DWV not built to code).Undersized water supply lines.Missing backflow prevention.Improperly installed or unvented water heaters.Fixture connections that don't meet the California Plumbing Code.Electrical violations are similarly common — non-GFCI outlets in wet locations, missing AFCI protection, panels without proper working clearance, double-tapped breakers, and reversed polarity. Mechanical issues center on non-residential or absent ventilation and heaters not rated for habitable space.How amnesty MEP plans differ from a new buildThe deliverable and process are similar to a standard ADU permit, but the starting point is reversed. Instead of designing systems from a blank slate, the MEP engineer must:Document existing conditions — what is actually installed in the unit today.Identify deficiencies — where the existing systems fall short of current code.Design the corrective upgrades — the work needed to bring the unit to a compliant, safe standard.The resulting plan set shows both existing and proposed conditions, so the plan checker and inspector can see what is changing and verify the unit reaches code. See our plumbing and electrical pages for what code-compliant systems must include.Legalization is not a paperwork exercise — it is an engineering retrofit. The plans must prove the existing systems were brought up to code, which usually means a field assessment before drawings begin.Practical guidanceHave the existing systems assessed before assuming a unit is "close" to compliant — plumbing venting and electrical safety items are frequently hidden.Expect corrective construction, not just drawings.Confirm the unit's construction date and your city's amnesty intake process, since eligibility hinges on it.Amnesty rules are new and vary by jurisdiction — confirm current eligibility and procedures with your local building department. If you are legalizing a unit, our team prepares MEP plans documenting existing conditions and required upgrades; start with the Full MEP Package or read the complete ADU MEP guide.

Question 9

What are the most common reasons ADU permit applications are delayed?

Accepted Answer

Most ADU permit delays are not caused by the city being slow — they are caused by avoidable problems in the submittal that trigger correction rounds or restart the review clock. Understanding the usual culprits lets you design them out before you file.The most common delay driversIncomplete submittal. A missing Title 24 CF1R, missing MEP sheets, or architectural plans that don't meet the city's format requirements trigger an incomplete notice — which means the review clock doesn't start (or resets). This is the single biggest avoidable delay.MEP plans missing required elements. No electrical load calculation, absent equipment schedules, missing GFCI/AFCI notation, or a plumbing DWV/venting layout not fully shown. Each of these comes back as a correction and adds weeks per round.Wrong Title 24 code cycle. Submitting energy documentation prepared under the prior code cycle for a permit filed on or after the new code's effective date. The CF1R bounces and must be redone under the current cycle.Utility coordination started too late. Discovering near completion that an electrical panel upgrade or new service connection requires weeks-to-months of utility processing — a delay that lands entirely outside the building permit timeline.Sewer lateral problems found during construction. Not inspecting the existing sewer lateral before work begins, then finding mid-project that it needs replacement — costly and schedule-wrecking.Uncoordinated plan sets. Architectural, structural, and MEP plans that contradict each other (outlets in walls that don't exist, equipment that doesn't fit the layout). Reviewers flag coordination conflicts, and resolving them means revising multiple disciplines.Why MEP is so often the bottleneckMEP corrections are disproportionately common because the documents are technical and easy to under-prepare. A set that omits a load calculation or doesn't show vent stacks looks complete to a non-engineer but is instantly flagged by a plan checker. Because plan check tends to be sequential — the city reviews, you correct, the city re-reviews — each MEP miss can add a multi-week loop.The least expensive week in an ADU project is the one you spend getting the submittal complete before you file. Every correction round after submittal costs far more time than it would have to prevent.How to prevent delaysSubmit a genuinely complete package: site, architectural, structural, MEP, and a registered CF1R.Make sure MEP sheets include load calculations, equipment schedules, GFCI/AFCI notation, and full DWV/venting.Confirm your Title 24 documents are prepared under the current code cycle for your submittal date.Open utility service requests the same week you submit for permit.Camera-inspect the sewer lateral before construction.Coordinate architectural, structural, and MEP plans so they agree.Where we helpBecause we prepare California-specific, permit-ready MEP sheets — with load calculations, schedules, and notation included — and we handle city corrections at no extra charge, ordering coordinated plans removes several of the items on this list at once. See how it works, our Full MEP Package, and the FAQ. Requirements and timelines vary by jurisdiction and change frequently — confirm your city's current submittal standards before filing.

Question 10

What changes in ADU law should I know about for 2025-2026?

Accepted Answer

California's ADU laws are revised almost every legislative session, and the 2025-2026 window brought several meaningful changes affecting timelines, occupancy, legalization, unit counts, and the energy code. Here is what matters most for a homeowner, contractor, or designer planning a project in this period.Key statutory changesAB 1332 (enacted 2025) — pre-approved plans. Every California city must maintain a library of pre-approved ADU plans. Applications using a pre-approved plan must be approved or denied within 30 days, versus 60 days for a custom design. This is a fast track for homeowners willing to build from a standard design.AB 976 (permanent, effective 2024) — no owner-occupancy for ADUs. The owner-occupancy requirement for standard ADUs is permanently eliminated, so you can rent out both the main house and the ADU without living on the property. Note that JADUs still require owner occupancy.AB 2533 (2025) — amnesty / legalization. Creates a pathway to legalize unpermitted ADUs built before 2020. Cities cannot deny these permits based on building-standard violations alone unless a severe safety hazard exists.SB 1211 (enacted 2025) — more units on multifamily lots. Allows up to eight detached ADUs on qualifying multifamily lots, subject to conditions. Verify applicability with your jurisdiction.SB 543 (effective January 1, 2026) — 15-day completeness clock. The city must notify you of any missing application items within 15 business days; miss that window and the application is deemed complete by operation of law.The 2025 Energy Code (Title 24, Part 6)The 2025 California Energy Code applies to ADU permit applications submitted on or after January 1, 2026, and it reshapes mechanical and electrical design:Heat pumps become the prescriptive baseline for space conditioning and water heating, making all-electric designs the path of least resistance.Expanded HERS verification — refrigerant charge verification across all 16 climate zones and tighter duct leakage limits.Battery / energy-storage readiness (ESS-ready) provisions for new detached ADUs.Higher insulation and envelope minimums across most climate zones.This means a CF1R prepared under the prior code cycle will be rejected for a permit filed on or after the effective date — your Title 24 report must be on the current cycle.What this means for your projectChangePractical impactAB 1332Consider a pre-approved plan for a 30-day decisionAB 976Rent both units; no need to live on site (ADUs)AB 2533Legalize an old unpermitted unit instead of demolishingSB 1211Potentially many units on a multifamily lotSB 543Faster certainty on completeness2025 Energy CodeDesign all-electric; use current-cycle Title 24The through-line of these reforms is clear: faster approvals, fewer occupancy strings, and a strong push toward all-electric, heat-pump-based design.ADU law changes every session and details vary by jurisdiction — confirm the current rules and effective dates with your local building department before relying on any single provision. To make sure your MEP and energy documents reflect the current code, see our Full MEP Package with the Title 24 add-on, or read the California ADU requirements page.

California ADU Permit Guide

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