HERS Rating
Field verification of energy-efficiency measures required by Title 24.
Home Energy Rating System (HERS) is a third-party field verification of specific Title 24 energy measures — duct leakage, refrigerant charge, building envelope air-tightness. A certified HERS rater visits the project after rough-in and again at final to perform the tests.
HERS is mandatory for almost every new ADU and most additions. Typical cost: $500–$1,200 per project. Failing a HERS test can require duct sealing or HVAC corrections before final inspection.
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FAQ — HERS Rating
What does "HERS Rating" mean in plain English?
Field verification of energy-efficiency measures required by Title 24. Browse the full construction glossary for related terms.
Why does HERS Rating matter for a California ADU or remodel?
HERS Rating comes up in the California building code side of nearly every Greater LA and Bay Area project we touch. Home Energy Rating System (HERS) is a third-party field verification of specific Title 24 energy measures — duct leakage, refrigerant charge, building envelope air-tightness. Getting it right at design saves rework later — getting it wrong is one of the most common reasons permits stall. See how it lands in our five-phase process and the relevant field guides.
Where will I see HERS Rating on my own project?
Most owners run into HERS Rating during the design or plan-check phase — specifically inside schematic design or permit submittal. Your project manager flags it on the schedule, walks you through what the city expects, and confirms documentation is in place before the inspection that depends on it.
Does HERS Rating cost extra?
Sometimes — depends on whether it adds scope (a report, a structural detail, a fee) or just a paperwork step. Anything cost-impacting is itemized in your contract or change order, never buried in the invoice. Sanity-check your number with the ADU cost calculator and the 2026 cost report.
Who at Alpha Dream handles HERS Rating?
The project architect owns design-level decisions; the permit runner owns city interactions — see the California permit directory; the project manager owns field execution. You always know who to ask. Start a conversation on the contact page.
When does HERS Rating typically come up in the project schedule?
Most often during permit submittal or early construction. The full sequence is on the process page.
Is HERS Rating handled differently in LA vs the Bay Area?
Yes — local interpretation varies. The LA studio and Bay Area studio note the regional shifts on each city hub.
What documents prove compliance with HERS Rating?
City-specific — the California permit directory lists the form set per jurisdiction. Field journal entries show what actually clears plan check.
Which trades or consultants own HERS Rating on a typical job?
Architect, structural engineer, or Title 24 consultant — depends on the term. The process page maps roles across the five phases.
How does HERS Rating affect the project budget?
Direct line item in the contract when it triggers a report, detail, or fee. Pricing bands are in the 2026 cost report.
Has HERS Rating changed recently under California law?
California ADU and remodel law has shifted every legislative session since 2017. Material changes land first on the field journal; definitions update quarterly here.
Where can I read the underlying statute for HERS Rating?
Each glossary entry cites the relevant Gov Code, building code section, or city bulletin. The permit directorylinks the source portals.
Which ADU type is HERS Rating most relevant to?
Cross-references live on the ADU types index. The term often appears in detached ADU and JADU contexts most.
Can I send HERS Rating questions to your team?
Yes — use the contact page. We add the most-asked questions to the site-wide FAQ monthly.
What's a related term I should also read after HERS Rating?
Each entry cross-links 3–5 related terms. Browse the full set on the glossary index.
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