Permit and Report Problems

Most people meet Title 24 at the permit counter: a plan checker asks for a report, a correction notice arrives, or the design changes after the report is done. Start with the situation closest to yours. Each page answers one question and points to the code behind the answer.

In this section

• Do I need Title 24 for this? (24)
• Unpermitted work, older homes and older permits (12)
• Plan check and design changes (18)

Do I need Title 24 for this?

Whether a specific kind of project triggers the Energy Code, from room additions and window swaps to pool houses, prefab homes and fire rebuilds.

1. Do I Need a Title 24 Report for My Project?
2. Does a Remodel Need Title 24?
3. When Is Title 24 Required for a Home?
4. What Is Exempt From Title 24?
5. What Happens If You Have No Title 24 Report?
6. Do Tiny Homes Need Title 24?
7. Does Title 24 Apply to Manufactured Homes?
8. Do Shipping Container Homes Need Title 24?
9. Rebuilding After a Wildfire: What Title 24 Asks
10. Does a Patio Cover, Pergola or Carport Need Title 24?
11. What Is Unconditioned Space Under Title 24?
12. Do You Need a Permit to Replace an HVAC System or Water Heater in California?
13. Do I Need Title 24 for a Room Addition?
14. Do I Need Title 24 for a Garage Conversion?
15. Do I Need Title 24 for a Window Replacement Permit?
16. Do I Need Title 24 for an HVAC Replacement Permit?
17. Do I Need Title 24 for a Water Heater Permit?
18. Do I Need Title 24 for a Roof Replacement?
19. Do I Need Title 24 for a Pool House?
20. Do I Need Title 24 for a Guest House?
21. Do I Need Title 24 for a Detached Office or Studio?
22. Do I Need Title 24 for a Tiny Home in California?
23. Do I Need Title 24 for a Prefab Home?
24. Do I Need Title 24 for a Fire Rebuild?

Unpermitted work, older homes and older permits

What changes when the work is already built, the home is old or undocumented, or the permit began under an earlier edition of the code.

1. Title 24 for Unpermitted Work and As-Built Permits
2. Expired Permit: Which Title 24 Code Applies?
3. Does My Project Fall Under the 2022 or the 2025 Energy Code?
4. Can You Reuse a Title 24 Report?
5. Do You Need a Title 24 Report to Sell a House?
6. How Long Is a Title 24 Report Valid?
7. Title 24 for Legalizing Unpermitted Construction
8. Title 24 for As-Built Permits in California
9. Title 24 for a Project With No Existing Plans
10. Title 24 for an Older Home With Unknown Insulation
11. Title 24 for a Remodel With Existing Single-Pane Windows
12. Title 24 for a Permit That Was Started Under the 2022 Code

Plan check and design changes

Why a plan checker says the report does not match, what to do when the architect or contractor changes something, and a checklist before you submit.

1. Which Title 24 Documents Does the Inspector Want at Final Inspection?
2. What Must the Plan Set Show for Title 24?
3. What Is a Title 24 Compliance Letter?
4. How Long Does Title 24 Plan Check Take?
5. Title 24 Checklist: What to Have Ready Before You Order
6. 15 Title 24 Mistakes That Trigger Plan Check Corrections
7. 12 Things to Know Before Ordering a Title 24 Report
8. Why Does a Title 24 Design Not Comply?
9. What If Plan Check Returns Title 24 Corrections on a House?
10. What If Plan Check Returns Title 24 Corrections on an ADU?
11. Can I Do My Own Title 24 Report?
12. Title 24 for a Permit Revision After Plan Check
13. Can Title 24 Be Done Before Final HVAC Equipment Is Selected?
14. Can Title 24 Be Done From Preliminary Plans?
15. What Happens If the Architect Changes the Plans After Title 24?
16. What Happens If the Contractor Installs Different Equipment Than the CF1R?
17. Why Does the Plan Checker Say Title 24 Does Not Match the Plans?
18. Title 24 Checklist Before Building Permit Submittal

For the bigger picture, see everything you need to know about Title 24, the requirements overview and all Title 24 questions.