How Do You Read a Title 24 Report?

Call (626) 365-1518 | Alternative Energy Systems

A Title 24 report can look complicated when you first open it. It may contain project information, energy calculations, compliance forms, insulation values, window performance data, mechanical-system information, water-heating specifications, lighting requirements, and possible verification measures.

How Do You Read a Title 24 Report becomes much easier when you stop treating it as one large technical document and instead review it in a logical order.

A practical reading sequence is:

Confirm the project information
Identify the project scope
Review the building-envelope requirements
Review windows and exterior doors
Review HVAC, ducts, and ventilation
Review water heating
Review lighting and controls when applicable
Identify verification or field-testing requirements
Compare the report with the construction plans
Confirm that the report still matches the current design

The report should not be read separately from the construction drawings. It is most useful when the energy calculations, compliance forms, plan notes, schedules, and equipment specifications all describe the same project.

Alternative Energy Systems brings more than 30 years of California energy-compliance experience to residential, multifamily, mixed-use, and commercial projects.

Call (626) 365-1518 if you have an existing report that you do not understand, need help comparing it with the plans, or need the documentation reviewed after a design change.

The Fastest Way to Read a Title 24 Report

Start with the parts that affect actual construction.

Instead of trying to understand every calculation immediately, first answer these questions:

Is this the correct property?
Does the report describe the correct project?
What insulation is required?
What window performance is listed?
What HVAC equipment is represented?
Where are the ducts located?
What ventilation system is represented?
What water-heating system is listed?
What lighting or control measures apply?
Are any measures identified for field verification?

These items provide a practical overview of what the energy report expects the building to include.

After that, compare those requirements with the plans and specifications.

Step 1: Confirm the Project Information

Before analyzing technical values, make sure you are reading the correct report.

Check:

Project address
Owner or project identification
Residential or commercial project type
New construction, addition, alteration, conversion, or other scope
Conditioned floor area when applicable
Plan or report version

This step may seem basic, but it is important.

A technically complete report prepared for:

A different address
An earlier floor plan
A smaller addition
A previous HVAC system
An older window schedule

may no longer represent the project being submitted.

Step 2: Identify What Part of the Project the Report Covers

Determine what was actually analyzed.

The report may apply to:

An entire new home
A detached ADU
An attached ADU
A garage conversion
A room addition
A residential remodel
A multifamily improvement
A commercial tenant improvement
A mechanical alteration
A commercial lighting project

Do not assume that every item shown elsewhere in the construction plans was included in the energy analysis.

The report must be interpreted according to the scope for which it was prepared.

Step 3: Look for the Compliance Measures

The report translates the proposed design into energy-related requirements.

These measures are among the most important parts of the document because they describe the building characteristics represented in the calculations.

Depending on the project, they may include:

Wall insulation
Roof insulation
Ceiling insulation
Floor insulation
Window performance
Glazed-door performance
Roofing information
HVAC equipment efficiency
Duct locations
Ventilation requirements
Water-heating equipment
Residential lighting measures
Commercial lighting requirements
Lighting controls
Applicable verification measures

Think of these as the energy assumptions upon which the report was prepared.

If the building is constructed differently, the report may no longer correspond to the actual project.

Step 4: Read the Building-Envelope Information

The building envelope separates conditioned space from exterior or unconditioned areas.

Review information involving:

Exterior walls
Roofs
Ceilings
Floors
Attics
Floors over garages
Other surfaces surrounding conditioned space

Look for insulation values and the location where each assembly applies.

The construction plans should show corresponding information.

For example, if the energy report represents a particular exterior-wall insulation value, the architectural wall section should not show a conflicting assembly.

Do Not Read Insulation Values Without Checking the Plans

A number on the report is useful only when you know which building assembly it belongs to.

Check whether the value applies to:

Walls
Attic ceiling
Roof deck
Vaulted ceiling
Raised floor
Floor over unconditioned space

Different parts of the project may use different assemblies.

Step 5: Read the Window and Exterior-Door Information

Windows are one of the easiest places to compare the report with the plans.

Review:

Window area
Window orientation
Window performance
U-factor
Solar heat gain coefficient
Glazed exterior doors

Then compare that information with:

The floor plans
Exterior elevations
Window schedule
Product specifications

What Does U-Factor Tell You?

The U-factor is one of the performance characteristics associated with the window or glazed assembly.

When reviewing the report, the important practical step is to make sure the product ultimately selected for the project is consistent with the performance represented in the energy documentation.

What Does Solar Heat Gain Coefficient Tell You?

Solar heat gain coefficient is another window-performance characteristic commonly used in the energy analysis.

Again, the key construction issue is coordination.

The window product, schedule, plans, and energy documentation should not contradict one another.

Step 6: Read the HVAC Information

Look for the heating and cooling systems represented in the report.

Depending on the project, information may include:

System type
Heating equipment
Cooling equipment
Equipment efficiency
Heat-pump information
Number of systems
Areas served
Equipment location

Then compare the report with:

Mechanical plans
Equipment schedules
Manufacturer specifications
Architectural notes where applicable

If the contractor later installs different equipment, the report should be reviewed to determine whether the change affects the calculations or forms.

Step 7: Read the Duct Information

Duct information can affect both the energy analysis and possible field-verification requirements.

Look for:

Ducted or ductless system
Duct location
Duct insulation
Other applicable duct-related measures

Pay particular attention to where ducts are represented as being located.

Ducts located within conditioned space can be treated differently in the analysis from ducts located in an attic, crawlspace, garage, or other unconditioned area.

The mechanical plans should remain consistent with the report.

Step 8: Read the Ventilation Information

Ventilation is separate from ordinary heating and cooling.

The report may identify requirements involving:

Whole-building ventilation
Local exhaust
Outdoor-air systems
Other project-specific ventilation measures

Compare the energy documentation with the mechanical plans and equipment specifications.

If the ventilation strategy changes, notify the energy consultant.

Step 9: Read the Water-Heating Information

Review the water-heating system represented in the report.

Information may involve:

Equipment type
Energy source
Efficiency
Storage configuration
Tankless equipment
Heat-pump water heating
Equipment location
Central or individual systems

Then compare that information with the plumbing, mechanical, architectural, or equipment schedules used for the project.

A report showing one type of water-heating system should not be submitted with plans showing a different system without review.

Step 10: Read Commercial Lighting and Control Information

For commercial and nonresidential projects, the report may include information involving lighting power and controls.

Review:

Lighting fixture information
Fixture wattage
Fixture quantities
Room or space use
Interior lighting power
Exterior lighting
Occupancy controls
Automatic shutoff controls
Daylighting controls

Compare the report with:

Electrical plans
Lighting fixture schedules
Lighting-control plans
Architectural room information

Commercial lighting changes made after the energy analysis can require updated documentation.

For related services, review Title 24 compliance services and Title 24 energy analysis.

Step 11: Look for Verification Requirements

Some projects may identify measures requiring separate field testing or verification.

The energy report can identify these measures, but the report itself does not perform the field test.

Possible verification requirements can be associated with:

Duct systems
Airflow
Mechanical equipment
Other performance-sensitive features

When you see a verification requirement, determine:

What needs to be verified
Who must perform the verification
When the verification occurs
What documentation will be required

Do not wait until the end of construction to discover that a required measure needed separate field verification.

What Does a Verification Requirement Mean for the Contractor?

It means the specified feature should be installed in a way that can satisfy the applicable verification process.

The contractor should understand which measures shown in the energy documentation affect field installation.

That can help avoid situations where completed work must be revisited because the installed system does not correspond to the approved compliance documentation.

Step 12: Compare the Report With the Architectural Plans

This is one of the most important steps.

The construction plans show what is intended to be built.

The Title 24 report evaluates the energy-related characteristics of that design.

Compare the documents for consistency involving:

Conditioned floor area
Wall assemblies
Roof assemblies
Insulation
Window quantities
Window sizes
Window performance
Exterior doors
Mechanical equipment
Duct conditions
Ventilation
Water heating
Lighting
Lighting controls

A correct energy calculation based on an obsolete plan set can still create a permitting problem.

How Do You Know if the Report and Plans Do Not Match?

Look for obvious conflicts.

Examples include:

The report shows 2,000 square feet while the plans show a different conditioned area
The report lists windows that do not appear on the elevations
The report uses different window performance from the schedule
The report shows one HVAC system while the mechanical plans show another
The report lists one insulation level while the sections show another
The report shows a different water-heating system
The commercial lighting schedule changed after the report was prepared

These conflicts should be resolved before permit submission or construction whenever possible.

Step 13: Identify What the Report Requires the Plans to Show

A Title 24 report is not simply a calculation stored separately from the permit set.

Certain energy measures may need to remain visible in the construction documents.

These can involve:

Insulation requirements
Window performance
Mechanical equipment
Ventilation
Water heating
Lighting
Controls
Applicable verification measures

The architect, designer, contractor, or responsible project professional should make sure the drawings communicate the energy requirements represented in the report.

Step 14: Determine Whether You Are Reading the Current Report

Title 24 reports can become outdated when the project changes.

Before relying on the document, ask whether the plans changed after the report was prepared.

Changes may include:

Floor area
Room configuration
Windows
Exterior doors
Insulation
Roof assemblies
HVAC equipment
Duct locations
Ventilation
Water heating
Commercial lighting
Lighting controls

If any of these changed, the report may need to be reviewed or revised.

How Do You Read a Residential Title 24 Report?

For a residential project, concentrate first on the building envelope and mechanical systems.

Review:

Conditioned floor area
Wall insulation
Roof and ceiling insulation
Floor insulation where applicable
Window performance
Heating and cooling equipment
Duct location
Ventilation
Water heating
Applicable residential lighting measures
Verification requirements

Then compare those items with the plans and equipment schedules.

The purpose is not simply to determine whether the report says the project complies.

You also need to understand what features the project relies on for compliance.

How Do You Read an ADU Title 24 Report?

For an ADU, begin by confirming whether the report represents:

A detached ADU
An attached ADU
A garage conversion
A conversion of another existing space

Then review:

Conditioned floor area
Windows
Insulation
Roof conditions
HVAC equipment
Ventilation
Water heating

For conversions, pay close attention to how the report distinguishes existing construction from the newly conditioned space.

Visit the ADU Title 24 page for additional information.

How Do You Read an Addition or Remodel Report?

Additions and remodels often require careful separation between existing and proposed construction.

Look for:

Existing conditioned floor area
New conditioned floor area
New exterior walls
New or replacement windows
New insulation
Roof and ceiling changes
HVAC changes
Duct extensions
Ventilation changes
Water-heating changes

Make sure the report did not evaluate a different project scope from the one eventually shown on the permit plans.

How Do You Read a Commercial Title 24 Report?

For commercial projects, read the report by system.

Review:

Building Envelope

Look at walls, roofing, insulation, windows, glazing, and other envelope information.

Mechanical Systems

Compare the report with mechanical plans and equipment schedules.

Ventilation

Review the ventilation information associated with the spaces and mechanical systems.

Service Water Heating

Compare the represented system with the project specifications.

Lighting

Review fixture information, lighting power, and applicable lighting measures.

Controls

Look for occupancy, automatic shutoff, daylighting, or other control requirements where applicable.

Commercial projects often involve several design disciplines, so document coordination is especially important.

What Parts of a Title 24 Report Should a Contractor Read?

A contractor should focus on the requirements that affect construction and product selection.

Important items include:

Insulation values
Window performance
Roof requirements
HVAC equipment
Duct requirements
Ventilation
Water-heating equipment
Lighting requirements
Controls
Verification measures

The contractor should also compare the energy requirements with the approved construction plans rather than relying on one isolated page of the report.

What Parts Should a Homeowner Read?

A homeowner does not need to interpret every technical calculation.

Focus on:

Whether the project information is correct
What windows are represented
What insulation is required
What HVAC system is represented
What water-heating system is represented
Whether separate verification is identified
Whether the report matches the plans and products being purchased

If you are about to order windows, HVAC equipment, or another major component, compare the proposed product with the energy documentation first.

What Parts Should an Architect or Designer Read?

Architects and designers should focus strongly on plan coordination.

Review whether the drawings communicate:

Conditioned floor area
Envelope assemblies
Window performance
Roof characteristics
Mechanical information
Ventilation
Water heating
Commercial lighting and controls
Applicable energy notes

The report should not contain important requirements that are contradicted by the permit drawings.

What Should You Not Assume When Reading a Title 24 Report?

Do not assume:

The report replaces the construction plans
The report guarantees permit approval
The report guarantees correct construction
Every product can be substituted freely
An old report automatically applies to revised plans
Every project has the same verification requirements
Field testing has already been completed because it appears in the report

The report documents the energy-related characteristics of the proposed design.

The project must still move through plan review, construction, applicable verification, and inspection.

What if You Find a Mistake in the Report?

Do not edit technical values yourself and assume the result remains valid.

Instead, identify the issue and compare it with the current plans.

Potential problems include:

Incorrect address
Incorrect floor area
Wrong windows
Wrong insulation
Wrong HVAC equipment
Wrong water heater
Outdated lighting design

Send AES:

The existing report
The latest plan set
Updated specifications
A description of the suspected conflict

AES can determine whether the report needs correction or revision.

What if the Building Department Has Questions About the Report?

Send the complete correction notice rather than one isolated comment.

Also provide:

The latest architectural plans
Current mechanical plans
Current electrical or lighting plans when applicable
The previously submitted report
Updated product specifications
A summary of design changes

AES can review the correction and determine whether the calculations, forms, specifications, or plan notes need to be updated.

How Do You Know Whether the Report Passed?

Do not reduce the report to one number without understanding the project-specific compliance measures.

The report is prepared to document how the proposed design addresses the applicable energy requirements.

The important practical questions are:

Does the report represent the actual design?
Are the required compliance measures identified?
Do the plans contain those measures?
Are the applicable forms complete?
Are any required verification measures understood?

A report that demonstrates compliance but does not match the actual construction documents can still create problems.

How to Read a Title 24 Report Before Buying Materials

Before purchasing major energy-related components, compare the proposed materials with the report.

Pay particular attention before ordering:

Windows
Exterior glazed doors
Insulation
Roofing materials
HVAC equipment
Water-heating equipment
Commercial lighting fixtures
Control equipment

Changing a major component after the report is complete can affect compliance.

When in doubt, send the proposed specification to AES before the product is purchased or installed.

A Simple Title 24 Report Reading Checklist

Before considering your review complete, confirm:

The address is correct
The project scope is correct
The floor area is correct
The report applies to the latest plans
Insulation matches the drawings
Windows match the schedule
HVAC equipment matches the mechanical plans
Duct locations are consistent
Ventilation is coordinated
Water heating matches the specifications
Commercial lighting matches the electrical plans
Required controls are understood
Verification measures are identified
The contractor understands the applicable construction requirements

If several of these items do not match, the report should be reviewed before permit resubmittal or construction continues.

Why Choose Alternative Energy Systems?

Alternative Energy Systems provides professional Title 24 report preparation, energy calculations, revisions, and plan-check support throughout California.

AES brings more than 30 years of California energy-compliance experience to:

New residential construction
New commercial construction
ADUs and garage conversions
Additions and remodels
Multifamily projects
Commercial tenant improvements
HVAC projects
Commercial lighting projects
Plan-check corrections
Revisions to existing calculations and reports

AES can review an existing Title 24 report, explain the energy-related requirements, compare the documentation with the current plans, and identify information that may need revision.

Learn more through the About Us page or review the company’s background on the clients page.

Need Help Reading a Title 24 Report?

Call (626) 365-1518 | Alternative Energy Systems

Understanding How Do You Read a Title 24 Report comes down to identifying the energy measures and comparing them with the actual project plans.

Start with the project information. Then review the building envelope, windows, HVAC equipment, ducts, ventilation, water heating, lighting, controls, and any verification measures.

Most importantly, confirm that the report reflects the current design.

Alternative Energy Systems can help if:

You do not understand an existing report
The report does not appear to match the plans
The project design has changed
You are selecting windows or equipment
The contractor has questions about energy requirements
The building department issued correction comments
You need revised calculations or forms

Call (626) 365-1518 or begin through the contact page.

When service and payment have already been arranged, payment can be completed through the AES payment page.

Frequently Asked Questions: How Do You Read a Title 24 Report?

How Do You Read a Title 24 Report?

Start by confirming the project information, then review the building envelope, windows, HVAC systems, ducts, ventilation, water heating, lighting, controls, and applicable verification measures. Compare those items with the current construction plans.

What is the most important part of a Title 24 report?

The most important practical information is the set of energy-related building features and systems represented in the calculations and compliance forms.

How do I know whether I have the correct report?

Check the project address, project scope, floor area, plan version, and major building systems against the current drawings.

What window information should I read?

Review window area, orientation, U-factor, solar heat gain coefficient, and applicable glazed-door information.

What insulation information should I read?

Review the insulation values and determine which wall, roof, ceiling, floor, or attic assemblies they apply to.

What HVAC information should I read?

Look for the system type, efficiency, equipment, location, number of systems, and related duct information.

What does duct location mean?

It identifies where ductwork is represented in the energy analysis, such as conditioned or unconditioned areas. It should match the mechanical design.

What ventilation information should I check?

Review the ventilation measures shown in the report and compare them with the mechanical plans and equipment specifications.

What water-heating information should I check?

Review the equipment type, energy source, efficiency, configuration, and location represented in the documentation.

How do I read a commercial Title 24 report?

Review the document by system: building envelope, mechanical systems, ventilation, service water heating, lighting power, and lighting controls.

What do verification requirements mean?

They identify project measures that may require separate field testing or verification. The report itself does not perform that testing.

Does the report replace the construction plans?

No. The report documents the energy-related characteristics of the design and must remain coordinated with the plans.

What if the report and plans do not match?

The documents should be reviewed before permit submission or construction. AES can determine whether the report, plans, or both require revision.

Can I change the windows after the report is completed?

A window change may affect the energy analysis. Send the new specifications to AES before assuming the existing report remains applicable.

Can I change the HVAC equipment?

Mechanical-system changes may affect calculations, forms, or verification requirements and should be reviewed.

How do I know whether the report is outdated?

Compare the report with the current plan set and determine whether floor area, windows, insulation, HVAC, water heating, lighting, or other analyzed features changed.

What should a contractor look for?

Contractors should focus on insulation, windows, roofing, HVAC systems, ducts, ventilation, water heating, lighting, controls, and verification requirements.

What should a homeowner look for?

Homeowners should confirm the project information and major product or system requirements, especially before purchasing windows, HVAC equipment, or water-heating equipment.

What if the building department has questions about the report?

Send AES the complete correction notice, latest plans, previously submitted report, and updated specifications.

Can AES review an existing report that someone else prepared?

AES can review available project documents and determine what assistance may be needed based on the report, plans, and current project scope.

How do I get help understanding my report?

Call Alternative Energy Systems at (626) 365-1518 and provide the report and current construction plans for review.