TLDR

• California’s updated Title 24 rules starting in 2026 apply to new commercial buildings, additions, and major retrofits, requiring more detailed HVAC design, controls, and documentation.
• Contractors and property managers must plan for new requirements like demand response controls, third-party testing, and updated equipment specs to stay compliant and avoid delays.
• Costs and timelines may increase due to added controls and permitting steps, but energy savings and incentives can help offset expenses; early planning and clear bids are essential.

California’s updated Title 24, Part 6 energy code takes effect in 2026, changing rules for commercial retrofits on nonresidential buildings, additions, and major alterations. These new requirements mean that even simple HVAC upgrades may now require more detailed design, controls, and documentation than before. Contractors and property managers must rethink equipment sizing, operating sequences, and permitting steps to stay compliant. The rule changes impact bids, timelines, and project planning for any retrofit that goes beyond minor repairs.

What the 2026 Title 24 Energy Code Requires

The 2026 Title 24 update applies to projects beyond minor repairs. This means many retrofits, additions, and major alterations must complete new compliance forms. They also require acceptance testing, which is a third-party check to confirm the system meets code. Demand response (DR) controls are now mandatory in some cases. These controls allow HVAC systems to adjust when utilities signal high demand, helping reduce energy use.



Equipment rules have changed too. Systems must be heat pump ready, support better ventilation, and include economizers that use cool outside air when possible. Fans need to meet higher efficiency standards. Refrigerant rules are stricter, limiting older units that use harmful gases.



Paperwork is more detailed. Updated compliance forms, commissioning plans (which outline testing and setup), and operation and maintenance (O&M) manuals are required. It’s important to work early with the authority having jurisdiction (AHJ), usually the local building department, to ensure smooth approvals and compliance.

Bid, Budget, and Timeline Impacts for Owners

Adding new controls, sensors, and commissioning steps will increase project costs. However, these expenses can be balanced by energy savings and utility rebates designed to encourage efficiency. Offering Good, Better, and Best options helps owners choose how much to invest based on their budget and goals. Timing is also a key challenge. Permit reviews, scheduling acceptance tests, and waiting for specialized equipment can delay projects. Locking in submissions early and phasing work carefully can reduce tenant disruptions and keep timelines on track. To protect bids from unexpected cost hikes, include price-escalation clauses and alternatives for supply shortages. Make sure your proposal clearly outlines the compliance process, so owners understand the steps needed to meet the updated rules. This approach reduces risk and builds confidence in your bid.

Design Moves That Keep Retrofits Compliant

Start by right-sizing your equipment using updated load calculations. This means carefully redoing the heating and cooling math to fit new demands. Avoid simple one-for-one swaps because the code now often requires extra ventilation or heat pump capacity. Next, upgrade your controls with demand response–ready thermostats or a building automation system (BAS). Include CO2-based demand-controlled ventilation, which adjusts fresh air based on occupancy, saving energy when spaces are empty. Also, add fault detection and diagnostics (FDD) features where required; these help spot problems early. For system choices, pick high-efficiency heat pumps or variable refrigerant flow (VRF) systems, along with fans that have a high fan energy index (FEI). Don’t forget economizers, which use cool outside air to reduce mechanical cooling needs. Finally, plan ahead for refrigerant changes and make sure you have enough space for service access. These design steps help ensure your retrofit meets the new Title 24 requirements without surprises.

Action Plan: 30/60/90 Days

Start by screening all projects planned for 2026 within 30 days. Flag any that involve additions or major alterations, since these will trigger the new Title 24 requirements. Meet with the Authority Having Jurisdiction (AHJ), usually the local building department, to confirm which projects need compliance forms and what documentation is required. By 60 days, update your project takeoffs and specification language to reflect the new code. Build a controls package that meets the demand response and efficiency standards. Also, pre-qualify installers and acceptance testers who understand the updated commissioning and testing needs. At 90 days, develop and publish Good, Better, and Best retrofit packages that align with Title 24. Include compliance checklists with your bids to make approval smoother. Finally, brief property owners and managers on the demand response enrollment process and schedule commissioning dates to keep projects on track and compliant.

Key Takeaways

• California’s 2026 Title 24 update applies to new nonresidential buildings, additions, and major alterations, meaning many commercial retrofits now face stricter HVAC design and compliance rules beyond simple equipment swaps.
• Contractors must revisit equipment sizing, control strategies, and permit workflows to meet new requirements like demand response controls, third-party acceptance testing, and updated refrigerant standards.
• Property managers and owners should expect higher upfront costs and longer timelines due to added controls, commissioning, and paperwork, but energy savings and utility incentives can help offset these expenses.
• To stay compliant and competitive, retrofit teams should prepare phased action plans that include early AHJ coordination, updated bid packages with Good/Better/Best options, and clear documentation for demand response enrollment and commissioning.

Frequently Asked Questions

What projects does the 2026 California Title 24 update apply to?

The update covers new nonresidential buildings, as well as additions and major alterations to existing commercial properties. It doesn’t just apply to new construction, so many retrofit projects must now meet these rules.

How will the new Title 24 rules affect HVAC design for commercial retrofits?

Design teams need to rethink equipment sizing, controls, and ventilation to meet stricter energy and emissions standards. Simple equipment swaps may require more detailed documentation, demand response controls, and acceptance testing.

What are the cost and scheduling impacts for property owners under the new code?

Costs may rise due to added controls, sensors, and commissioning requirements. Permitting and testing can also extend timelines, so early planning and phased work are important to avoid tenant disruption.

Why should contractors and property managers care about these new Title 24 requirements?

Contractors must adjust bids and specs to stay compliant and profitable, while property managers need to understand that even minor HVAC upgrades could trigger stricter design and documentation rules. Staying informed helps avoid costly delays and penalties.

Related Topics: Title 24 update, HVAC commercial retrofits, California energy code 2026, commercial HVAC regulations, HVAC equipment redesign, HVAC controls compliance, nonresidential HVAC permits, energy efficiency code, HVAC retrofit planning, commercial HVAC upgrades, HVAC project timeline, HVAC code compliance