Title 24 Energy Compliance in San Diego, CA
Title 24 energy compliance in San Diego means your ADU, garage conversion, or home addition meets California’s mandatory building energy efficiency standards before the city issues a permit. For most attached or detached ADUs in San Diego County, that involves a compliance report prepared with approved software, documentation of insulation levels, window ratings, HVAC efficiency, and lighting plans, and a set of forms submitted with your permit package. Lodgewick ADU San Diego handles this as a standard part of ADU Design & Permitting in San Diego, so you’re not chasing paperwork after the plans are already drawn. Call (619) 376-2760 if you’re sitting on a permit correction notice or want to know whether your project will clear Title 24 before you spend money on plans.
We’re the ADU company of the Kingswell family, building accessory dwelling units, garage conversions, and home additions under The Kingswell Guarantee since 2010. That guarantee means a written price before work starts, a real arrival window, a clean job site, and a written guarantee on every project. Title 24 compliance is not a gray area in San Diego. It’s a set of calculations and documentation requirements your project either passes or doesn’t, and getting it wrong means a stalled permit or a failed inspection. We make sure it’s right the first time, and if it isn’t, the 365-Day Done Right Promise means we come back and make it right.
What Title 24 Energy Compliance Actually Covers
Title 24 is shorthand for Title 24, Part 6 of the California Code of Regulations: the California Energy Code. It sets minimum efficiency requirements for new construction and additions, and it applies to every permitted ADU and garage conversion in San Diego, whether you’re building with a prefab manufacturer like Boxabl or Plant Prefab, or stick-building on site with James Hardie siding. The code does not tell you how to build your ADU. It tells you how well the finished structure has to perform, and you prove that performance with calculations, not guesswork.
A Title 24 compliance report covers the building envelope (insulation in walls, floors, and ceilings), fenestration (window and skylight U-factor and solar heat gain coefficient), space conditioning (heating and cooling equipment efficiency), water heating (tankless vs. storage, heat pump water heaters), and lighting (high-efficacy fixtures and controls). San Diego’s mild coastal climate means the heating and cooling loads are different from inland projects in El Cajon or Escondido, and the compliance calculations reflect that. A project that pencils out in Pacific Beach may need different window specifications in Rancho Bernardo, and the report has to account for the specific climate zone.
Here’s the part most homeowners miss: Title 24 compliance is not a one-time checkbox. The documents get reviewed by the city when you submit for your permit, and the same documents get referenced again at final inspection. If the installed insulation does not match what the compliance report specified, the inspector can flag it. That’s why we match the compliance report to the actual build, not to a generic template that looks good on paper and fails in the field.
When You Need Title 24 Energy Compliance
If any of these situations sounds familiar, your project has a Title 24 requirement attached to it:
- You’re submitting plans for a new detached ADU. Every new accessory dwelling unit in San Diego, whether site-built or delivered as a prefab unit, requires a Title 24 compliance report as part of the permit submittal.
- You’re converting an existing garage into living space. A garage conversion changes an unconditioned space into conditioned space, which triggers the full energy code for the new envelope, insulation, and mechanical systems.
- You received a permit correction notice from the City of San Diego or the County. Corrections related to Title 24 are common when plans were drawn by someone who doesn’t work in San Diego’s climate zones regularly. We fix the report and resubmit.
- You’re adding square footage to an existing home with an attached ADU or JADU. Additions bring the new conditioned space under current code, and the compliance report needs to cover the added area, not the original house.
- You’re working with a prefab or panelized manufacturer. Brands like Boxabl and Plant Prefab ship units with specific envelope ratings, and the Title 24 report must reflect those exact specifications, not assumed values.
- Your final inspection is scheduled and you’re not sure the energy documents are in order. We review existing compliance paperwork, verify the installed systems match, and correct discrepancies before the inspector finds them.
Why Title 24 Trips Up So Many San Diego ADU Projects
Most Title 24 delays we see come from one of three places. The first is a compliance report generated for the wrong climate zone. San Diego County spans several California climate zones, and a report written for a coastal ZIP code will not hold up for a project in Lakeside or Alpine. The second is a mismatch between the compliance report and the actual construction documents. The architect calls for R-19 wall insulation, the compliance report was modeled with R-13, and the city reviewer catches the discrepancy. The third is equipment changes made after the report was filed. A homeowner swaps the specified water heater for a different model, and the final inspection fails because the installed equipment does not match the documented efficiency rating.
None of these are complicated to fix when caught before submittal. They’re expensive to fix when caught after the permit is issued. That’s why we produce the Title 24 report alongside the construction drawings, not as an afterthought, and why we check every equipment schedule against the compliance model before anything goes to the city.
Our Title 24 Energy Compliance Process
We don’t treat Title 24 as a separate service you have to coordinate on your own. It’s built into how we handle ADU Design & Permitting for San Diego projects. Here’s the sequence:
- Project intake and climate zone confirmation. We confirm the project address, verify the correct California climate zone, and review the scope: new ADU, JADU, garage conversion, or addition. This determines which energy code requirements apply.
- Envelope and equipment review. We collect the architectural plans or the manufacturer’s spec sheets if you’re using a prefab unit, plus the mechanical, plumbing, and lighting schedules. For projects using Plant Prefab or Boxabl, we work directly with the manufacturer’s data.
- Compliance modeling. Using approved Title 24 compliance software, we model the building envelope, windows, HVAC, water heating, and lighting. This produces the performance calculations the city requires for permit submittal.
- Documentation package assembly. We assemble the compliance forms (including the CF1R certificate of compliance), required for your permit package, and review them against the construction drawings for any mismatches.
- Submittal and corrections support. If the city reviewer returns comments, we address them directly and resubmit. We also prepare the CF2R installation certificates and CF3R field verification forms used at final inspection.
- Inspection readiness check. Before your final inspection, we verify the installed insulation, windows, HVAC, water heating, and lighting match the compliance model, and we correct any discrepancies so the inspection passes.
Title 24 Energy Compliance Pricing in San Diego
Title 24 compliance for a typical detached ADU in San Diego runs from $450 to $900 when handled as part of a full design and permitting package. If you need a compliance report corrected or redone for an existing project, expect to pay $350 to $650 depending on scope and what documentation already exists. A garage conversion that includes envelope upgrades and mechanical work typically falls in the $500 to $850 range for the compliance report alone.
What actually moves the number:
- Project size and complexity. A 400-square-foot studio ADU models faster than a 1,200-square-foot two-bedroom unit with multiple HVAC zones.
- Climate zone. Coastal San Diego projects model differently than inland projects, and the compliance strategy shifts accordingly.
- Prefab vs. site-built. Prefab units from Boxabl or Plant Prefab come with manufacturer specs that speed up the modeling, but only if those specs match what’s actually delivered.
- Whether corrections are needed. If the city already returned comments on a report someone else prepared, there’s additional rework involved.
- Documentation quality. Complete, current architectural drawings and equipment schedules mean fewer assumptions and a faster report.
The Kingswell Guarantee applies here the same way it applies to every Lodgewick project: you get a written price before any work begins, no price changes at the door, and a written guarantee on the compliance work. If something fails during the 365-day guarantee period because our report was wrong, we return and fix it at no charge. Call (619) 376-2760 for a free estimate on your project. A live person answers, 24 hours a day, seven days a week.
How Title 24 Works With San Diego’s Local Permitting
The City of San Diego and San Diego County both require Title 24 documentation as part of a complete permit submittal, but the review culture is different depending on where you’re building. City reviewers in San Diego tend to focus heavily on prescriptive compliance for windows and insulation in coastal zones. County reviewers, handling projects in unincorporated areas like Spring Valley or Bonita, often spend more time on mechanical system efficiency and water heating for inland climate zones. We’ve been submitting Title 24 documents in both jurisdictions for over a decade, and we know what each review desk looks for.
One detail that catches people off guard: San Diego’s local amendments to the energy code, including requirements for solar-ready provisions on new ADUs in certain jurisdictions. The state energy code requires new residential construction to be solar-ready in most cases, and the compliance report has to reflect that. If your plans don’t include the solar-ready zone or the correct electrical panel notation, the city will kick the report back. We include these local requirements in the compliance model from the start, so the report clears review the first time.
Title 24 and Prefab ADU Brands: Boxabl, Plant Prefab, and What the Specs Mean
Prefab and panelized ADUs have become a serious option for San Diego homeowners, and we work with several manufacturers directly. Boxabl units ship as a single folding module with specific insulation values, window ratings, and HVAC equipment built in. Plant Prefab builds panelized units with customizable envelope packages. The Title 24 compliance work for these projects is different from site-built because the manufacturer’s data sheet is the foundation of the energy model. If someone runs the compliance report using generic assumptions instead of the actual factory specs, the report is worthless.
We request the manufacturer’s energy documentation directly, verify it against what’s actually being delivered, and model the compliance report around those real numbers. When a project uses James Hardie siding or other materials that affect the envelope assembly, those details go into the model too. The goal is a compliance report that matches the building that actually gets delivered and installed, not an idealized version of it.
Title 24 Compliance vs. HERS Testing: What You Actually Need
Homeowners sometimes get told they need a HERS rater separately from the Title 24 compliance report, and that’s only half true. The HERS (Home Energy Rating System) is a field verification process required for certain measures in the compliance model, including duct leakage testing, airflow verification, and refrigerant charge confirmation. If your compliance report includes HERS-required measures, you’ll need a certified HERS rater to complete field verification before final inspection. We coordinate that so the paperwork chains together: the CF1R comes from the compliance model, the CF2R comes from the installer, and the CF3R comes from the HERS rater or field technician. If any one of those forms is missing at final inspection, the inspector can withhold sign-off. We make sure all three are in place before the inspector arrives.
Common Title 24 Mistakes We Fix
Roughly a third of the Title 24 work we take on involves fixing a report someone else prepared poorly. The most common issues we see in San Diego:
- Wrong climate zone in the model. A report modeled for Climate Zone 7 (coastal) gets used for a project in Climate Zone 10 (inland), and the whole calculation is invalid.
- Window ratings that don’t match the plans. The compliance model specifies windows with a U-factor of 0.30, the plans call for 0.32, and the city reviewer flags the mismatch.
- Missing solar-ready documentation. New ADUs in most San Diego jurisdictions require solar-ready provisions, and the compliance report must show them.
- Equipment substitutions after submittal. The water heater on site doesn’t match the one in the compliance model, and the final inspection fails on the discrepancy.
- Incomplete CF2R forms. Installers don’t sign off on insulation, windows, or duct sealing, leaving the compliance chain broken at final inspection.
If your permit is held up on any of these, call (619) 376-2760. We review what was submitted, identify what’s wrong, and correct it. Pricing for correction work starts around $350 depending on what needs to be redone.
Why Lodgewick ADU San Diego Handles Title 24 Differently
We don’t send Title 24 work to a third-party service and hope it comes back right. The compliance report is part of the same design and permitting process we manage from the first site visit to the final inspection. That matters because Title 24 is not a standalone document; it’s a set of calculations that has to match the architectural drawings, the structural plans, the mechanical schedule, and the actual building that gets constructed. When one team handles all of it, the report matches the plans matches the build.
That’s The Kingswell Way: say the price before the work, show up in the window we gave you, leave the property cleaner than we found it, put the guarantee in writing, and come back if it fails. For Title 24 work specifically, the guarantee means if our compliance report is rejected by the city because we made an error, we fix it at no charge and resubmit until it clears. Period.
Key Takeaways: Title 24 Energy Compliance in San Diego
- Every permitted ADU, JADU, garage conversion, and addition in San Diego requires Title 24 documentation. There is no workaround, and the report must match the actual construction.
- Typical Title 24 compliance for a San Diego ADU costs $450 to $900 as part of a full design and permitting package, with correction work starting around $350.
- The compliance report covers insulation, windows, HVAC, water heating, and lighting. San Diego’s local climate zones and solar-ready requirements affect the calculation.
- Prefab ADUs from Boxabl and Plant Prefab require compliance reports based on actual manufacturer specs. Generic assumptions produce reports that fail review.
- A written price and written guarantee apply to compliance work. The Kingswell Guarantee means no price changes at the door and a free return visit if the work fails within 365 days.
FAQs – Title 24 Energy Compliance
How much does Title 24 energy compliance cost in San Diego?
Title 24 compliance for a typical detached ADU in San Diego costs between $450 and $900 when handled as part of a full design and permitting package, while a correction or re-submittal for an existing project typically runs $350 to $650 depending on scope. The main cost drivers are project size, climate zone, whether the ADU is site-built or prefab, and the quality of the existing documentation. Call (619) 376-2760 for an exact quote, estimates are free and the written price is the price.
Can you fix a Title 24 report that the City of San Diego already rejected?
Yes, we correct Title 24 reports that received city or county review comments, and correction work in San Diego typically starts around $350 depending on what needs to be redone. We review the original compliance model, identify the specific errors that triggered the corrections, rebuild the report correctly, and resubmit it with the rest of your permit package. If our corrected report fails review because we made an error, the 365-Day Done Right Promise covers a free return visit to make it right.
Does a Title 24 report cover what gets checked at final inspection?
A Title 24 compliance report creates the documentation trail that inspectors verify at final inspection, including the CF1R certificate of compliance from the model, CF2R installation certificates from the installers, and CF3R field verification forms from a HERS rater when the project requires one. If any of those forms are missing or the installed equipment does not match the compliance model, the inspector can withhold sign-off. We prepare and coordinate all three form types so the inspection passes.
Do prefab ADUs from Boxabl or Plant Prefab still need Title 24 compliance in San Diego?
Yes, every prefab ADU in San Diego requires Title 24 compliance documentation, and the report must be modeled using the manufacturer’s actual energy specifications, not generic assumptions. We work directly with manufacturers like Boxabl and Plant Prefab to obtain the correct envelope, window, HVAC, and water heating data, then build the compliance model around those real numbers. A generic report using assumed values will not survive city review, which means a stalled permit and additional fees.
Can you come today if my permit is held up on Title 24?
We answer calls with a live person 24 hours a day, seven days a week, and we can typically schedule a Title 24 review within one to two business days depending on project volume. Call (619) 376-2760 and we’ll tell you over the phone what documentation to gather and what the next step is. You’ll get a written price before any work starts.
Call Lodgewick ADU San Diego for Title 24 Energy Compliance
If you need a Title 24 compliance report for a new ADU, a garage conversion, or an addition in San Diego, or if you’re stuck with a permit correction and want it fixed without guesswork, call (619) 376-2760. We’ll give you a straight answer on what’s required, a written price before any work starts, and a written guarantee on the work. A live person answers, 24/7. No voicemail loops, no chatbots.
Lodgewick ADU San Diego is the ADU company of the Kingswell family, building accessory dwelling units, garage conversions, and home additions since 2010. Every project, including Title 24 compliance work, operates under The Kingswell Guarantee: written price first, real arrival window, clean job site, written guarantee on every job. If it’s not done right, we make it right. That’s a promise we put in writing on every single project, before a single document is filed.
Written by Russ Delmar, Owner at Lodgewick ADU San Diego, serving San Diego.
