Title 24 and the Future of Energy Efficiency: What California Builders Need to Know

ByGilleran Energy Management

In California, energy efficiency isn’t just a best practice—it’s the law. With growing climate demands and tightening building regulations, Title 24 of the California Code of Regulations has become a foundational requirement for construction professionals. These standards shape how buildings are designed, built, and operated, influencing every phase of development from early planning to final inspection.

Title 24 applies to nearly every structure in the state. If you’re building a commercial facility, developing a multi-family community, or constructing a high-end custom residence, Title 24 compliance must be part of your workflow from day one. The upcoming 2025 updates (effective January 1st, 2026) introduce even more rigorous energy standards, and teams that fall behind risk costly rework, permitting delays, and missed sustainability targets.

At Gilleran Energy Management, Inc. (GEM), we provide strategic, code-driven consulting to ensure your project meets these evolving standards with clarity, accuracy, and cost-efficiency. Our role is to simplify the complex, delivering energy compliance solutions that preserve your design intent while meeting all state and local code requirements.

What Is Title 24?

Title 24 is California’s comprehensive building code that regulates the design and construction of energy-efficient buildings. Specifically, Part 6—known as the Energy Code—governs the performance of residential and nonresidential structures. The goal is to reduce energy usage, lower greenhouse gas emissions, and support California’s long-term climate action strategy.

The Energy Code applies to new construction as well as alterations and additions that affect lighting, mechanical systems, insulation, or the building envelope. It mandates performance thresholds for HVAC systems, fenestration, water heating, ducting, and ventilation, among other elements.

Every three years, the California Energy Commission updates Title 24 to reflect advancements in technology, energy modeling, and policy. These changes are not optional. Builders, developers, and designers must adapt to remain compliant and competitive in the state’s high-performance construction environment.

Why Compliance Should Start Early

Energy compliance is enforced at the permitting stage. Before plans are approved, documentation must demonstrate that the proposed building meets Title 24 requirements. This is typically achieved through one of two approaches:

  • Prescriptive Compliance: This method uses a fixed checklist of efficiency measures. It’s straightforward but often inflexible, requiring conservative design choices that may increase construction costs or limit creative solutions.
  • Performance Compliance: This pathway uses energy modeling software to analyze how a building will perform as a whole. It allows for component trade-offs and typically leads to smarter, more cost-effective design decisions.

At GEM, we prioritize performance-based compliance because it offers greater flexibility, reduces unnecessary expenses, and supports custom, complex, and high-end designs. Our consultants use certified software to generate permit-ready documentation and help teams avoid missteps from the start.

What to Expect in the 2025 Energy Code Update

California’s building codes are becoming more demanding, and the 2025 Energy Code is no exception. The next cycle includes substantial changes that will impact both the design and execution of projects across all sectors.

Key changes include:

  • Higher insulation thresholds for walls, roofs, and slab edges to improve thermal performance
  • Electrification readiness for appliances, space heating, and vehicle charging infrastructure
  • Stricter HVAC efficiency and ventilation standards to enhance indoor air quality and reduce energy consumption
  • More aggressive air sealing and leakage testing for ducts and building envelopes
  • Additional solar photovoltaic (PV) and battery storage requirements for certain occupancy types and building categories

These revisions demand early coordination between project teams, energy consultants, and permitting authorities. GEM is fully prepared for this next chapter and already helping clients plan accordingly.

Why Gilleran Energy Management Is the Right Partner

GEM is a leading energy consulting firm with deep technical knowledge, field-tested insight, and an unmatched level of client service. We specialize in sustainable, code-compliant solutions for California’s most forward-thinking developers, architects, and builders.

Here’s how we support your project:

  • We collaborate with your design team to align energy goals with aesthetic and functional objectives
  • We handle all modeling and compliance documentation required for building departments statewide
  • We stay ahead of code changes to prevent costly rework or delays during permitting
  • We recommend value-driven compliance strategies that support long-term energy savings without compromising performance
  • We offer responsive, educated guidance tailored to the unique needs of your project type

We’re not just documentation providers—we are problem-solvers, advocates, and reliable partners invested in your success.

Our Experience Across Sectors

Gilleran Energy Management has worked on thousands of projects across California. Our experience includes:

  • Affordable housing developments with tight financing timelines
  • High-end custom residences with complex performance requirements
  • Commercial office and mixed-use buildings balancing aesthetics and sustainability
  • Educational facilities, wineries, and cannabis operations with specialized infrastructure
  • LEED-certified buildings seeking alignment between Title 24 and USGBC guidelines

We’re especially adept at working within fast-moving, high-expectation environments, offering complete transparency and real-world solutions from pre-design to final inspection.

Build Smarter, Plan Earlier: Why Energy Strategy Starts Now

Energy code compliance is no longer a task to check off at the end of a project. It’s a critical consideration that should shape how buildings are planned, designed, and built, especially in California, where the Title 24 Energy Code continues to raise the bar.

By partnering with a proven energy consultant like Gilleran Energy Management, Inc., you get more than code compliance. You gain a strategic advisor who understands the full construction lifecycle, speaks the language of your team, and delivers high-quality, jurisdiction-ready results.

Let’s get your project moving in the right direction: on time, on budget, and up to code. Contact GEM today to learn how we can simplify your next project and maximize its long-term value.

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