What Is Title 24 in California?

Title 24 California is the part of the California building code that many property owners hear about as soon as a project heads toward permits. In plain English, it is the state’s energy code framework for buildings. It shapes how certain projects are designed, what may need to be shown on plans, and how a city or county plan reviewer may evaluate the proposed work.

If you are planning a remodel, addition, ADU, tenant improvement, or other permitted work, Title 24 may touch your project even if you are not changing the entire building. The practical question is usually not “What is the whole code?” but “How does this affect my plans?” That is where accurate existing-condition drawings become useful. FastAsBuilt provides field-measured as-built drawings and measured floor plans across California so design teams and owners can start from reliable information.

What Title 24 means in California

When people say “Title 24,” they are usually referring to the California rules that govern building energy performance. It is part of the broader California building code system, but in everyday use the phrase often points specifically to energy requirements for residential and nonresidential projects.

The important takeaway is that Title 24 is not just a technical document for engineers. It affects ordinary project decisions such as window changes, lighting layouts, insulation upgrades, mechanical equipment selections, and the way a scope of work is described on permit plans. Depending on the project, it can also influence forms, calculations, and plan notes prepared by your design or energy consultant.

For owners, the easiest way to understand Title 24 California is this: if your project needs a permit, there is a good chance the proposed work will be reviewed in light of applicable energy code requirements. The exact path depends on the building type, the scope, and the local jurisdiction’s process.

Why Title 24 matters for permit plans

Title 24 matters because permit review is based on what is documented. Even when your architect, designer, contractor, or energy consultant handles the technical compliance side, the plans still need to reflect the real building and the actual scope of work. If the starting plans are incomplete or inaccurate, the review process often becomes slower and more confusing.

That is why existing-condition documentation is so valuable before design begins. A field-measured plan gives the team a dependable baseline for dimensions, room layout, wall locations, openings, and other visible conditions. If you are new to the process, it helps to understand what as-built drawings are and why they are often the first step for remodeling and permit work.

For many California projects, the plan set needs to tell a clear story:

• What exists now
• What is being removed, altered, or added
• What new components are proposed
• How the scope fits into code review, including energy code review where applicable

Measured as-built drawings do not replace architectural design or energy calculations, but they help the rest of the permit package line up with reality. That can make it easier for your team to prepare permit-ready documents and reduce avoidable back-and-forth.

Which kinds of projects Title 24 can affect

Title 24 California can come into play on a wide range of projects. Some owners assume it applies only to new construction, but energy code issues often appear in alterations and additions too. The level of impact depends on the scope.

• Home remodels involving windows, doors, lighting, or mechanical systems
• Additions that expand conditioned space
• ADUs and conversions
• Kitchen and bath remodels tied to permitted electrical or mechanical work
• Tenant improvements in commercial spaces
• Larger reconfigurations where multiple systems are affected

If you are planning an ADU, existing plans are often one of the first things needed before design starts. Our guide to as-built plans for ADUs in California explains why measured drawings are commonly used to document the existing home or garage before a new unit is designed.

Similarly, if you are trying to understand the broader permit set, it helps to review what drawings you need for a building permit in California. Title 24 is one part of the larger approval picture, not the whole picture by itself.

In practice, the more your project changes the building’s envelope, lighting, or systems, the more likely energy code documentation becomes an active part of review. That does not mean every project becomes highly complex, but it does mean the plans should be prepared with care.

How Title 24 connects to as-built drawings

Title 24 compliance work usually happens after the existing building is documented. That sequence matters. Your designer or consultant needs reliable existing dimensions and layout information before preparing revised plans, energy-related details, and supporting documentation.

FastAsBuilt’s role is to capture the building as it exists today. We send local crews across Southern California, the Bay Area, and San Diego to perform on-site laser measurement. Then senior drafters produce permit-ready CAD files in PDF and DWG format. That gives your architect, designer, engineer, or contractor a clean base to work from.

Accurate as-builts are especially helpful when:

• You do not have original floor plans
• The house or tenant space has been altered over time
• Recorded plans do not match existing conditions
• You want to avoid designing from rough hand measurements
• Your permit package needs a clear existing layout

If you are starting without any usable plans, see do you need existing plans to pull a permit. Many owners discover that documenting existing conditions is the practical first move before the design team can sort out code compliance issues, including Title 24.

What Title 24 usually means for homeowners

For homeowners, Title 24 often feels abstract until a contractor or designer says a permit set needs energy documentation. The easiest way to think about it is that California wants certain building work to meet current efficiency standards when that work is performed. The exact requirements are project-specific, but the process usually becomes much smoother when your team starts with accurate plans and a clearly defined scope.

Homeowners commonly run into Title 24 questions during:

• Window and exterior door replacement tied to permitted work
• Room additions
• Garage conversions and ADUs
• Major remodels that change lighting or equipment
• Projects that alter conditioned areas of the home

If you recently bought a property and are not sure whether the current layout matches old paperwork, measured existing-condition drawings can help establish a dependable baseline. That is often the first step before your design team decides what needs to be updated for permit review.

FastAsBuilt offers 2D As-Built Plans starting at $900 for up to 1,500 square feet, then $0.50 per square foot, with one revision and typical 48–72 hour delivery. We also offer 3D As-Built Plans starting at $1,500, then $1.00 per square foot, including a 3D model plus 2D floor plans, elevations, and sections, with two revisions and typical 3–5 business day delivery. If you want to get started, you can place an order at /order.

Turnaround times are estimates and may vary based on project complexity and scheduling.

What Title 24 does not do

It helps to clear up a common misunderstanding: Title 24 is not the same thing as a full permit package, and it is not a synonym for every code requirement in California. A project can involve structural, life safety, zoning, accessibility, planning, and local review issues in addition to energy code matters.

That distinction is important because owners sometimes ask for “Title 24 plans” when what they actually need is a full set of existing and proposed drawings, possibly along with separate energy documentation prepared by the appropriate consultant. In other words, Title 24 may affect the plans, but it is not the entire plan set.

It is also important to understand that as-built drawings document existing conditions. They are not themselves a design for new work. Instead, they provide the accurate baseline that allows the rest of the team to produce proposed permit drawings and coordinate code-related requirements more effectively.

How to prepare before your design team tackles Title 24

If you expect your project to go through permit review, a little preparation upfront can save time later. The goal is to give your designer or contractor a reliable picture of the building as it stands now and a clear understanding of what you want to change.

Helpful first steps

• Gather any old plans, permit records, or real estate marketing floor plans you already have
• List the rooms or areas that will change
• Note any known unpermitted or undocumented alterations
• Decide whether you need simple 2D plans or more detailed 3D documentation
• Get measured as-built drawings if your existing plans are missing or unreliable

If your next question is how the documentation process works, our article on how to get permit-ready as-built drawings walks through the basics. The short version is that good permit documents usually start with a good survey of existing conditions.

For custom projects such as commercial work, ADUs, SB9 projects, and tenant improvements, FastAsBuilt provides individual quotes. That is often the best route when the project scope is more complex and the existing building needs more than a basic floor plan.

How FastAsBuilt supports California projects

FastAsBuilt focuses on one essential part of the process: documenting what is already there. We provide field-measured as-built drawings and measured floor plans across California, with local crews serving Los Angeles, Orange County, the Inland Empire, the Bay Area, and San Diego.

Our method is straightforward. We measure on site with laser tools, then senior drafters turn that field data into permit-ready CAD files. Clients receive PDF and DWG formats, which makes the drawings easier to hand off to architects, designers, engineers, and contractors.

This service is useful for homeowners, buyers, architects, and commercial tenants who need dependable base drawings before moving into design and code review. Whether your next step is a remodel, ADU, tenant improvement, or general permit planning, accurate documentation helps the rest of the workflow start on solid ground.

That value becomes even clearer when Title 24 California enters the conversation. Energy code review is easier to navigate when your team is not guessing about room sizes, wall placement, openings, and existing layout. Precise existing-condition plans do not solve every code question, but they remove a common source of preventable mistakes.

Frequently asked questions

Is Title 24 the same as the California building code?

Not exactly. In everyday conversation, people often use “Title 24” to mean California’s energy code requirements for buildings. But a permit review may also involve other building code, planning, zoning, structural, or local requirements. Title 24 is important, but it is only one part of the broader compliance process.

Do you need as-built drawings for Title 24 compliance?

Not in every case, but accurate as-built drawings are often the practical starting point when existing plans are missing, outdated, or unreliable. Your designer or consultant needs a correct picture of the current building before preparing proposed drawings and energy-related documentation.

Can FastAsBuilt prepare Title 24 energy calculations?

FastAsBuilt provides field-measured as-built drawings and measured floor plans. We document existing conditions and deliver permit-ready CAD files in PDF and DWG format. Energy calculations and other compliance documents are typically handled by the appropriate design or energy professional for the project.

How fast can you get measured plans for a California project?

Our 2D As-Built Plans typically deliver in 48–72 hours and include one revision. Our 3D As-Built Plans typically deliver in 3–5 business days and include two revisions. Timing for custom commercial, ADU, SB9, and tenant improvement projects is quoted individually based on scope.

Turnaround times are estimates and may vary based on project complexity and scheduling.

Bottom line

Title 24 California is the state’s energy code framework, and it can affect many permitted projects even when you are not building from scratch. The clearest way to stay organized is to start with accurate existing-condition drawings, then let your design team build the permit and compliance package from a reliable base. FastAsBuilt helps California owners and project teams do exactly that with field-measured as-built drawings and measured floor plans delivered in permit-ready CAD formats.