California Title 24 and Your Remodel: What It Means and What It Costs
California's Title 24 energy code quietly affects most kitchen and bathroom remodels. Here is what triggers it, what it costs, and how to plan around it.
California Title 24 is the state's building energy efficiency code, and it quietly affects most kitchen and bathroom remodels. It sets minimum standards for things like lighting, windows, insulation, and HVAC. For a typical remodel, Title 24 compliance adds roughly $300 to $4,000 depending on the work, and it is triggered by common upgrades like new lighting, replacement windows, or HVAC changes.
Here is what Title 24 actually requires, what it costs, and how to plan for it so it does not surprise you mid project. We handle compliance as part of our process, so you do not have to become an expert.
What is California Title 24?
Title 24 is the section of California's building code that governs energy use in buildings. Part 6 is the energy code most homeowners run into during a remodel, and it covers lighting efficiency, window performance, insulation, water heating, and heating and cooling systems. The goal is to lower energy use, and the rules apply to renovations, not just new construction.
The code updates on a cycle, with the 2025 edition taking effect January 1, 2026. The Bay Area sits in milder climate zones than inland or Southern California, which affects some requirements.
What kitchen and bathroom work triggers Title 24?
Title 24 compliance kicks in when your remodel touches energy using systems. Common triggers include:
- New or moved lighting, which must meet efficiency rules, typically high efficacy LED fixtures and controls.
- Replacement windows, which must meet a maximum U factor for energy performance.
- HVAC changes, like a new furnace, AC, or ductwork, which can trigger duct leakage and HERS verification testing.
- Building envelope changes, like new exterior walls during an addition.
- Additions and ADUs, which must comply fully.
Because kitchen and bathroom remodels almost always involve new lighting and ventilation, most projects touch Title 24 in some way.
How much does Title 24 compliance cost?
For most remodels the added cost is modest relative to the whole project. Rough ranges:
| Scope | Typical added cost |
|---|---|
| Kitchen, lighting only, no HVAC | $500 to $1,500 |
| Kitchen with HVAC changes | $1,500 to $4,000 |
| Bathroom | $300 to $1,000 |
These cover compliance documentation, higher efficiency fixtures and equipment, and any required HERS verification testing. They are separate from city permit fees.
How do you plan around Title 24?
The simplest approach is to design with the code in mind from the start. Specify high efficacy LED lighting and compliant fixtures during the design phase, choose energy efficient windows if you are replacing any, and budget for HERS testing if you are touching HVAC or ductwork. Doing this up front avoids redesigns and keeps the project on schedule.
We fold Title 24 into the design and quote so the requirements are priced in, not discovered later. That fits how we quote everything, as covered in our kitchen cost guide.
Frequently asked questions
Does every remodel have to comply with Title 24? Compliance is tied to the specific work. If you add or move lighting, change windows, or touch HVAC, those elements must comply. A cosmetic refresh that does not touch energy systems may not trigger it.
What is a HERS test? HERS stands for Home Energy Rating System. A third party rater verifies things like duct leakage and equipment performance when you change HVAC, and the test is required for code sign off.
Will Title 24 limit my design choices? Mostly it shapes fixture and equipment selection, like requiring efficient LED lighting. It rarely limits the look you want, since efficient options exist across styles.
Who handles the Title 24 paperwork? We do, as part of design and permitting. We prepare the compliance documentation and coordinate any required testing.
Plan a code compliant remodel
We design to Title 24 from day one so compliance is built into your quote, not a surprise. Book a free consultation, or start with our kitchen and bathroom cost guides.
