What Is Title 24 Energy Code?

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If you’re building or remodeling a property in California, you’ve likely come across the term “Title 24 energy code.” But what is Title 24 energy code, and why is it so important?

California’s Title 24 is more than just a set of rules—it’s a comprehensive energy code designed to reduce energy consumption in homes and buildings across the state. For property owners, contractors, architects, and developers, understanding Title 24 is essential to securing permits, lowering utility costs, and contributing to a sustainable future.

In this guide, we break down what the Title 24 energy code is, what it covers, and how you can stay compliant by working with the experts at Alternative Energy Systems (AES).

What Is the Title 24 Energy Code?

Title 24 is a section of the California Code of Regulations that governs the energy efficiency standards for residential and non-residential buildings. First introduced in 1978 and updated every three years by the California Energy Commission (CEC), it ensures that all buildings are constructed or renovated to meet minimum energy-saving requirements.

The Title 24 energy code is officially known as Part 6: Building Energy Efficiency Standards. It addresses the performance of various building systems and components, including:

Heating, ventilation, and air conditioning (HVAC)
Lighting systems and controls
Building envelope (walls, insulation, windows, doors)
Water heating and piping systems
Solar photovoltaic systems (for certain new homes)

The goal is to reduce the overall energy consumption of buildings, support California’s climate initiatives, and provide long-term savings for property owners and occupants.

Who Must Comply with Title 24?

Almost everyone involved in construction in California is required to comply with the Title 24 energy code. This includes:

Homeowners building new homes or additions
Contractors performing renovations or system upgrades
Architects designing residential or commercial buildings
Developers planning subdivisions or commercial projects

Whether it’s a single-family home, apartment complex, or office building, if you’re working on a project that includes lighting, HVAC, insulation, windows, or other regulated components, Title 24 compliance is a must.

How Is Compliance Achieved?

To comply with Title 24, you must have a certified energy consultant prepare a Title 24 energy compliance report. This document proves your design meets or exceeds the minimum efficiency standards and is required before you can pull a building permit.

After construction begins, certified HERS (Home Energy Rating System) raters perform on-site verification and testing to ensure what’s installed matches the report. Once everything checks out, your project passes final inspection, and you’re ready to move forward.

Why Work with AES?

At Alternative Energy Systems (AES), we’ve been helping clients navigate the Title 24 energy code for over 30 years. We offer fast, accurate, and affordable energy reports that are accepted by building departments across California.

Our services include:

Residential and Commercial Title 24 Compliance Reports
HERS Field Testing and Verification
LEED and GreenPoint Rating Assistance
Solar and QII Documentation

We ensure your plans are compliant from the start—so you avoid delays, rework, and headaches down the road.

Ready to Get Started?

Let AES take care of your Title 24 compliance so you can focus on building with confidence. Call today or visit our website to get started.

FAQ – What Is Title 24 Energy Code?

What is Title 24 energy code?
It’s California’s official energy efficiency standard for residential and non-residential buildings.
When was Title 24 introduced?
It was first implemented in 1978 by the California Energy Commission.
Why was Title 24 created?
To reduce energy consumption, lower emissions, and improve building performance statewide.
Who enforces Title 24?
Local building departments, guided by the CEC.
Is compliance mandatory?
Yes. You cannot receive permits for most construction projects without Title 24 approval.
What systems does it cover?
Lighting, HVAC, windows, insulation, water heating, and more.
Does Title 24 apply to remodels?
Yes, especially if your project impacts regulated energy systems.
What is a Title 24 energy report?
A certified document that proves your project meets California’s energy efficiency standards.
Who prepares the report?
Certified energy consultants like AES.
What is HERS testing?
Home Energy Rating System testing verifies energy compliance in the field.
Is solar required?
Yes, for most new residential constructions in California.
What is QII?
Quality Insulation Installation—a measure that must be verified to maximize performance.
Are multifamily buildings covered?
Yes. Title 24 applies to all residential building types, including multifamily units.
Can Title 24 save money?
Yes. It reduces long-term utility costs by improving efficiency.
How often is the code updated?
Every three years by the California Energy Commission.
What happens if I skip compliance?
You may be denied permits, face fines, or have to redo construction work.
What software is used?
CEC-approved tools like CBECC-Res and CBECC-Com are used for modeling.
Does AES offer same-day service?
Yes. Many reports are turned around in 1–3 business days.
Can Title 24 reports be reused?
Only if the project details remain unchanged and are still code-compliant.
How do I start?
Call AES at (626) 365-1518 or visit title24energy.com to request your report.