Ever stared at a permit submittal package and wondered why the city is asking for a form most people have never heard of? The Title 24 CF1R report explained in plain terms is simply California's official proof that a home meets state energy standards — and no residential permit moves forward without one. Yuna Drafting prepares these reports as part of its Title 24 energy calculation services, helping Bay Area homeowners and builders clear this hurdle before plan check even begins.

Title 24 CF1R report explained alongside Bay Area architectural permit drawings on a desk
Figure 1 — A completed CF1R certificate paired with a residential permit set ready for plan check.

The CF1R falls under California's Title 24 Part 6 energy standards, which the California Energy Commission updates on a regular cycle. It covers everything from wall insulation R-values to HVAC sizing to window solar heat gain. Essentially, the report captures every energy-related design decision in one document that a building department can check at a glance.

Contractors, HVAC installers, and inspectors all reference the CF1R at different stages of a project. When everyone works from the same numbers, inspections go faster and change orders shrink. When they don't, delays pile up fast. The sections below break down exactly what the CF1R is, who needs it, and how to keep it accurate from design through final inspection.

Contents

  1. Title 24 CF1R Report Explained: What the Document Actually Contains
    1. Key Sections of the Form
    2. CF1R vs. HERS Verification
  2. How a CF1R Report Gets Created, Step by Step
    1. Who Prepares It
    2. What Information Goes In
  3. When Contractors and Homeowners Actually Need It
    1. New Construction and ADUs
    2. Remodels and Additions
  4. Real-World Examples: CF1R on Bay Area Projects
    1. ADU Project Walk-Through
    2. Kitchen and Bath Addition Example
  5. The Software and Tools Behind the Calculation
    1. CEC-Approved Programs
    2. Key Inputs the Software Needs
  6. When the CF1R Causes Permit Delays — and How to Prevent Them
    1. Common Mistakes That Stall Permits
    2. Keeping the CF1R Accurate Through Design Changes
Bar chart showing Title 24 CF1R compliance categories including insulation windows HVAC and water heating
Figure 2 — Common CF1R compliance categories and the design decisions each one covers.

Title 24 CF1R Report Explained: What the Document Actually Contains

The CF1R — short for Certificate of Compliance: Residential — is the document that proves a home's design meets California's energy budget. It's generated by CEC-approved compliance software, signed by a qualified preparer, and submitted as part of the permit package. The building department reviews it at plan check to confirm the numbers add up before issuing a permit.

Key Sections of the Form

The CF1R is divided into logical groups. Each one covers a different building system:

  • Envelope — wall, ceiling, and floor insulation R-values; window U-factor (heat transfer rate) and SHGC (solar heat gain coefficient)
  • HVAC — heating and cooling equipment efficiency ratings, duct location, and insulation
  • Water Heating — tank or tankless specifications, efficiency factor, pipe insulation
  • Lighting and Ventilation — high-efficacy lighting requirements, exhaust fan efficiency
  • Mandatory Measures — a checklist of code minimums every project must meet regardless of the compliance path chosen

Each line on the form shows both the required minimum and the proposed design value. If the proposed value meets or beats the minimum, that line passes. If not, the design needs to change before the report can be finalized.

CF1R vs. HERS Verification

The CF1R lists what the design claims. HERS (Home Energy Rating System) verification confirms those claims in the field. Some CF1R measures — like duct leakage and refrigerant charge — require a HERS rater to physically test the installed system before the building department signs off. The CF1R triggers which field verifications are required, so contractors need to read it early, not after drywall goes up.

Pro tip: Pull the CF1R before ordering HVAC equipment. The efficiency ratings on the form must match the installed units exactly — swapping brands mid-project often means commissioning a revised report from scratch.

How a CF1R Report Gets Created, Step by Step

Creating a CF1R isn't something most contractors handle themselves. It requires CEC-approved compliance software and working knowledge of Title 24 Part 6. Here's how the process typically unfolds on a Bay Area project.

Who Prepares It

  • A licensed Title 24 energy consultant or drafting firm runs the compliance calculation using approved software
  • The preparer signs the CF1R and takes professional responsibility for its accuracy
  • The building department reviews it at plan check — discrepancies trigger a correction notice

Knowing how to read architectural drawings before permit submittal makes coordination between the design team and energy consultant much smoother. The CF1R pulls its data directly from those drawings.

What Information Goes In

The software doesn't estimate — every field traces back to a specific design decision. Here's what the energy consultant needs before the calculation can begin:

Data CategoryWhere It Comes FromWhy It Matters
Wall and ceiling assembly typesArchitectural drawings and specsSets insulation R-values
Window schedule (size, U-factor, SHGC)Window schedule on drawingsControls heat gain and loss
HVAC equipment model numbersMechanical schedule or contractor quoteSets efficiency ratings used in calculation
Water heater specificationsPlumbing scheduleDetermines hot water energy budget
Conditioned floor areaFloor planScales the overall energy budget
Climate zoneProject addressAdjusts baseline requirements for local conditions

Warning: Submitting a CF1R with estimated or placeholder equipment specs is a common mistake. If the installed equipment doesn't match the report, the final inspection will fail.

When Contractors and Homeowners Actually Need It

The CF1R is required any time a permit triggers California's energy code. That covers more situations than most people expect.

New Construction and ADUs

Every new home and ADU (accessory dwelling unit) in California requires a CF1R. The report is part of the permit set from day one. For ADU projects specifically, energy compliance often determines what HVAC system makes financial sense — a mini-split heat pump, for example, frequently performs better than a ducted gas system in a small footprint.

The ADU permit process in Santa Clara County includes energy compliance as a required submittal item at plan check. Getting the CF1R done early — before finalizing the mechanical design — prevents expensive revision cycles. The choice of structure type also affects the compliance path; the detached vs. attached ADU guide covers how each option changes the overall permit requirements, including energy code triggers.

Remodels and Additions

Additions over a certain square footage almost always trigger a full CF1R. Smaller additions may only need a simplified compliance check, but any HVAC replacement or new duct system in the altered area typically brings energy code into play. Kitchen and bath remodels that move walls or change insulation assemblies can also require a report. The general rule: if a permit is being pulled and the work touches the envelope or mechanical systems, a CF1R is likely needed.

Real-World Examples: CF1R on Bay Area Projects

ADU Project Walk-Through

Consider a 600-square-foot detached ADU in San Jose. The CF1R for this project had to account for several specific conditions:

  • Climate Zone 4 requirements reflecting the moderate Bay Area climate
  • All-electric design per Santa Clara County's local reach codes
  • Mini-split heat pump sized to the conditioned floor area
  • Heat pump water heater with proper clearance for operation

The CF1R flagged that the original window specifications were slightly over the SHGC limit. The designer swapped to a dual-pane low-e glass option, the report was rerun, and the permit sailed through without further comments. Total revision time: under two hours — because the CF1R and the drawings were already coordinated before submittal.

Kitchen and Bath Addition Example

A 400-square-foot addition in Mountain View triggered a CF1R because new HVAC ductwork was added to serve the expanded space. The energy consultant ran two compliance paths — prescriptive and performance. The performance path saved the owner roughly $1,800 in window upgrade costs by trading better wall insulation for standard glazing. That kind of trade-off only surfaces when someone actually reviews the CF1R output before ordering materials.

Pro insight: The performance compliance path often costs less than the prescriptive path for remodels. Running both options and comparing results before finalizing specs is always worth the extra step.

The Software and Tools Behind the Calculation

CEC-Approved Programs

California only accepts CF1R reports generated by CEC-approved compliance software. The two most widely used programs in residential work are:

  • EnergyPro — the industry standard for residential and light commercial Title 24 work across California
  • CBECC-Res — the CEC's free compliance tool, used frequently for straightforward single-family and ADU projects

Both produce the official CF1R PDF that gets stamped and submitted. The output format is standardized, so building departments across California read the same document structure regardless of which software generated it. Some energy consultants also use specialized tools for duct and HVAC sizing that feed directly into the compliance model.

Key Inputs the Software Needs

The software calculates a predicted energy use for the proposed design and compares it against a code-compliant baseline model built automatically from the project specs. If the proposed design uses less energy than the baseline, the project passes. If not, the design team has to adjust something — window specs, insulation levels, HVAC efficiency — until it does.

This is why energy compliance works best when it runs alongside design, not as an afterthought the week before permit submittal. Early coordination between the drafter, energy consultant, and mechanical contractor prevents the most common revision loops and keeps the CF1R accurate from the start.

Infographic showing the CF1R report workflow from design inputs through compliance software to permit approval
Figure 3 — The CF1R workflow: from design inputs to permit-ready compliance certificate.

When the CF1R Causes Permit Delays — and How to Prevent Them

Common Mistakes That Stall Permits

Most CF1R-related permit delays trace back to a handful of recurring errors:

  • Equipment mismatch — the CF1R lists a specific HVAC model but the contractor installs a different brand or efficiency tier
  • Missing HERS verification items — the report requires duct leakage testing but no HERS rater was scheduled before insulation closed the walls
  • Outdated code version — California updates Title 24 periodically; submitting under the wrong code cycle gets the report rejected at plan check
  • Incomplete window schedule — window specs on the CF1R don't match the architectural drawings, triggering a correction notice

All of these are fixable, but fixing them mid-project costs more than preventing them upfront. Getting comfortable with reading architectural drawings before submittal helps catch spec mismatches before the permit package goes in.

Keeping the CF1R Accurate Through Design Changes

Design changes happen on almost every project. When those changes affect energy-related assemblies or equipment, the CF1R needs an update before construction continues. A change order swapping window brands mid-project, for example, should prompt a quick check with the energy consultant to confirm the new specs still comply.

Small adjustments usually take less than a day to revise. Catching them late — at final inspection — costs far more in rescheduling and re-inspection fees. For projects moving through the Santa Clara County ADU permit process, keeping the CF1R in sync with any approved plan revisions is especially important because the county cross-checks the energy compliance package at final inspection against the installed systems.

Frequently Asked Questions

Not every renovation triggers a CF1R, but most permitted work that affects the building envelope, HVAC systems, or adds conditioned square footage does. Small cosmetic remodels with no structural or mechanical changes often don't require one. The local building department can confirm whether energy compliance is required for a specific scope of work before a permit application is submitted.

For a straightforward single-family or ADU project with complete drawings and equipment specs, a CF1R typically takes one to three business days. Projects with complex assemblies or performance-path trade-offs may take a bit longer. Rushing it the week before permit submittal is the most common cause of errors and missed information.

Technically, anyone can purchase CEC-approved software and generate a CF1R. In practice, most contractors rely on a licensed energy consultant or drafting firm because the software requires detailed knowledge of Title 24 compliance paths. Errors on a self-prepared report can cause permit rejections and revision costs that exceed the fee a professional would have charged.

Key Takeaways

  • The CF1R is California's required energy compliance certificate — no residential permit gets issued without one.
  • Contractors should review the CF1R before ordering HVAC equipment, since installed specs must match the report exactly or the final inspection will fail.
  • The performance compliance path often costs less than the prescriptive path for remodels — running both options before finalizing specs can reveal meaningful savings.
  • Design changes that affect energy systems need a CF1R revision before construction continues to avoid failed inspections and costly rescheduling.