Title 24 Energy Compliance in Orange County, CA

Title 24 Energy Compliance in Orange County, CA

Title 24 energy compliance is the set of California building standards that governs how much energy a new or altered structure may use. For any ADU, garage conversion, or room addition in Orange County, your project must pass Title 24 before the city will issue a final permit sign-off. Fielding ADU Orange County handles Title 24 documentation, modeling, and compliance checks as part of our ADU Design & Permitting in Orange County work, so the HERS rater visit, the energy model, and the permit paperwork all come together in one written plan. Call us at (424) 577-4306 if you’re mid-project and the building department just told you your addition needs Title 24 sign-off before we can move further.

Reed Calloway leads this work. He has spent years navigating the exact documentation that Orange County cities ask for, from Irvine to Anaheim to Huntington Beach, and he has been part of the Garrison Partners family since 2006. What that means in plain terms: the price for your Title 24 work goes in writing before we start, and every compliance measure we recommend is backed by The Garrison Code. Show up in the window, price in writing, by the book, leave it clean, stand behind it for a year. That applies to the energy compliance part of your project exactly as it applies to the framing and drywall.

When You Need Title 24 Energy Compliance

Not every addition triggers the same Title 24 requirements, but most do. Here are the concrete situations where we step in:

• Your building department flagged the permit. The city reviewer sent back your ADU or room addition plans with a note that says “Title 24 compliance required” or “HERS verification pending.” You need the energy model and the field verification done before the permit moves.
• You’re converting a garage into living space. Garage conversions in Orange County almost always trip Title 24 because the building envelope changes. Walls that were never insulated, ceilings that were never sealed, windows that were never part of conditioned space now all count. Your energy model has to account for every one of them.
• You’re adding a prefab or modular ADU. We work with Abodu, Cover, Dvele, and Mighty Buildings units. Those systems ship with their own compliance docs, but Orange County cities still want a local Title 24 filing that ties the unit to your specific lot. We bridge that gap.
• You changed the HVAC system, water heater, or windows. Any equipment or envelope change inside a permitted addition gets modeled. A heat pump in a Huntington Beach ADU performs differently than the same unit in a Yorba Linda hillside addition, and the model has to reflect that.
• Your old Title 24 documentation is out of date. The 2022 Energy Code took effect January 1, 2023, and the 2025 code followed. If your plans were drawn under an older standard, the city may now ask for a re-check. We re-run the model under the current code and tell you plainly what changed.
• You’re selling and the buyer’s inspector flagged the addition. Unpermitted or improperly permitted ADUs in Orange County routinely surface during escrow. If a Title 24 gap shows up, we close it so the transaction can move.

Our Title 24 Energy Compliance Process

Here is how we take a Title 24 requirement from a line item on a permit comment to a signed-off compliance document:

1. Plans review and gap check. We pull your approved or in-review plans and identify exactly which Title 24 sections apply. That includes the building envelope, lighting, mechanical, water heating, and any solar or battery storage requirement tied to your specific occupancy type. We do this before any field work so there are no surprises at the end.
2. Energy modeling. We build the compliance model using the same software the HERS raters and city reviewers use. Your wall assemblies, window specs, roof insulation, HVAC efficiency, and water heating are entered as they will actually be built, not as the architect hoped they would be. If the model fails, we adjust components one at a time and tell you the real dollar difference between the options.
3. Plan set documentation. We produce the compliance documentation in the format your city wants. Orange County is not one jurisdiction. Santa Ana reads things one way, Laguna Niguel another, and a Fullerton reviewer may ask for something neither one mentioned. We file with the language and format each one expects.
4. Field verification scheduling. For the measures that require on-site verification, we coordinate the HERS rater visit and make sure the installed work matches the model. If the insulation is not there yet, we reschedule before the rater arrives, because a failed HERS test costs you another visit fee.
5. Permit sign-off package. Once everything passes, we assemble the final compliance documents and deliver them to the building department with your sign-off request. You receive the same package in writing, so you have the record for resale, for your lender, and for any future title work.

Title 24 Energy Compliance Pricing in Orange County

What you pay depends mainly on the size of the conditioned space, the number of measures already built, and whether your plans need a full re-model or just a documentation package. Below are the ranges we see across Orange County for ADU and room addition work:

• Title 24 documentation only (no field verification): $800 – $1,400. This covers the energy model, compliance forms, and delivery of the sign-off package for a project that does not require a HERS field visit.
• Title 24 with one HERS rater field visit: $1,200 – $2,100. Most ADUs and garage conversions in Orange County fall here. The rater verifies insulation, windows, and in some cases lighting or ventilation measures that were specified in the model.
• Full compliance for a 2-bedroom ADU (model, documentation, two field visits): $1,800 – $3,200. This is common when the addition includes a mini-split system, a heat pump water heater, and insulation that needs a second look after the wall cavities are closed.
• Full compliance for a garage conversion with HVAC change-out: $1,600 – $2,800. The range moves with the size of the conversion and whether the existing HVAC was replaced or extended.
• Individual re-checks or partial re-models (failed first review, changed window spec): $350 – $700 per change. When a city reviewer kicks back an existing set, the fix is usually narrower than people fear. We tell you the flat cost of the re-check before we touch the model.

Three things push the price up in Orange County specifically. First, climate zone. Orange County sits in climate zones 6, 8, 10, and 16 depending on how inland you are, and the compliance requirements are different for a Santa Ana bungalow than they are for a coastal Dana Point cottage. Second, the existing envelope. A detached ADU with no shared walls carries a heavier wall insulation requirement than an attached room addition. Third, whether your city requires solar readiness or photovoltaic at the time of filing. Some do, some do not, and we will tell you which side of that line your project sits on before you pay anything.

Every Title 24 quote from us is a written price before any work starts. Not an estimate with a disclaimer underneath. A number on paper, exactly like the rest of the addition it belongs to. If the number changes, it will only change because you changed the scope, and we will write that down too. Call (424) 577-4306 for a free estimate on your Title 24 work.

FAQs – Title 24 Energy Compliance

How much does Title 24 energy compliance cost in Orange County?

Title 24 compliance for a standard ADU or garage conversion in Orange County typically runs between $1,200 and $3,200 depending on whether a HERS field visit is required, the size of the conditioned space, and how many compliance measures the city is asking to verify. Documentation-only work starts around $800. Call (424) 577-4306 with your project details and we will give you a written price, not a vague range.

Can you come today to fix my Title 24 compliance problem?

If the city has already flagged your permit and you are holding a correction letter, call us at (424) 577-4306 and we will tell you what can be done same day versus what needs a scheduled field visit. A documentation gap can often be corrected same day or next day. A failed HERS field test requires a re-scheduled visit, and we will book the earliest window the rater has available.

Is it cheaper to repair my Title 24 documentation or start over with a new energy model?

In most Orange County cases, repairing the existing documentation is cheaper, because the building envelope data does not change even when a city reviewer flags the paperwork. We pull the original model, correct the specific deficiency, and re-file for $350 – $700. Starting over from scratch only makes sense if the plans themselves changed substantially, like a different window package or a revised HVAC system.

Do you handle Title 24 for prefab ADUs from companies like Abodu or Cover?

Yes. We work with Abodu, Cover, Dvele, and Mighty Buildings units and file the local Title 24 documentation that ties each unit to its specific Orange County lot. The prefab manufacturer ships with a compliance package, but the city still requires a local filing that reflects your site. We handle that handoff so the permit moves without the manufacturer and the city talking past each other.

What happens if my ADU fails the final Title 24 check?

If a Title 24 check on a Fielding ADU Orange County project fails, we correct it and return at no charge under The Garrison Standard. Our work is covered in writing for 365 days from the date of completion. If something fails inside that year, we come back and make it right at no cost to you.

The cleanest path through Title 24 in Orange County is to fold it into the design and permitting work from the beginning. That way the energy compliance is part of the same written price, the same permit set, and the same schedule as every other piece of your addition. If you are holding a Title 24 correction from a city reviewer, or you are about to build and want the compliance handled by someone who does this every week, call (424) 577-4306. Reed will answer or a member of his team will. We answer around the clock, every day of the week.

Written by Reed Calloway, Owner at Fielding ADU Orange County, serving Orange County.