When Is a Title 24 Report Not Required?

Call (626) 365-1518 | Alternative Energy Systems

When Is a Title 24 Report Not Required depends on what work is actually being performed. California’s Energy Code applies broadly to new construction, additions, and alterations involving regulated building components, but that does not mean every maintenance project, interior improvement, or permit requires a complete performance-modeled Title 24 report.

The first distinction is between the Energy Code applying to a project and the project requiring a full Title 24 energy report.

Some projects may fall outside the Energy Code because the work is genuinely a repair or does not alter a regulated energy feature. Other projects remain subject to Title 24 but may be able to use specific prescriptive compliance forms instead of a full building energy model.

Examples that may not require a full Title 24 report can include:

• True maintenance or repair work that does not constitute an Energy Code alteration
• Interior cosmetic work that does not change regulated energy systems or the building envelope
• Projects where no conditioned floor area is added and no regulated energy component is altered
• Certain limited alterations that can be documented using applicable prescriptive compliance forms
• Work specifically outside the scope of the Energy Code

The important word is may.

Replacing windows, roofing, HVAC equipment, water-heating equipment, insulation, hardwired lighting, or another regulated component can trigger Energy Code requirements even when the project owner considers the work a repair or replacement.

Alternative Energy Systems can review the proposed work and help determine whether your project needs a complete energy analysis, a limited compliance form, revised documentation, or no Title 24 report from AES.

Call (626) 365-1518 before ordering a report you may not need—or assuming that a project is exempt when energy documentation is actually required.

The Most Important Question: Does the Project Affect an Energy-Regulated Component?

A useful way to determine whether a Title 24 report may be required is to look at what the project changes.

California energy requirements can apply to areas such as:

• Conditioned floor area
• Exterior walls
• Roof and ceiling assemblies
• Insulation
• Windows and glazed doors
• Heating and cooling systems
• Duct systems
• Mechanical ventilation
• Water heating
• Hardwired lighting
• Commercial lighting controls
• Electrical power-distribution features where applicable

If the work does not affect any regulated building component and is truly outside the Energy Code’s scope, a Title 24 energy report may not be necessary.

If one or more of these systems changes, additional review is appropriate before deciding that no report or compliance documentation is required.

A Full Title 24 Report and Title 24 Compliance Are Not Always the Same Thing

One of the most common misunderstandings is that every project affected by Title 24 requires a complete computer-modeled energy report.

That is not always the case.

Depending on the project, compliance may involve:

• A project-specific performance analysis
• A prescriptive Certificate of Compliance
• An alteration-specific form
• An addition-specific form
• Equipment-related compliance documentation
• Installation documentation
• Field-verification documentation

A limited alteration may therefore need Title 24 documentation without requiring the same type of energy report used for a new home or complex commercial building.

This distinction matters when asking When Is a Title 24 Report Not Required.

The better question is often:

What Title 24 documentation does this particular project require?

True Repairs May Fall Outside the Energy Code

California distinguishes a repair from an alteration.

A repair generally involves reconstructing or renewing part of an existing building for maintenance purposes.

When work is genuinely a repair and does not become an alteration of an Energy Code-regulated component, the project may fall outside the Energy Code requirements that would otherwise trigger energy documentation.

However, the word “repair” should not be used simply because an existing component is being replaced.

For example, replacing a component or system for which the Energy Code establishes alteration requirements can be treated as an alteration rather than a repair.

That distinction can affect whether Title 24 documentation is required.

Maintenance Is Different From Replacing a Regulated System

Routine maintenance may not trigger the same requirements as replacing a regulated building system.

Examples of maintenance can include work intended to keep an existing component functioning without materially altering the regulated design.

By contrast, projects involving replacement of regulated components should be reviewed carefully.

Potential examples include:

• Roof replacement
• Window replacement
• HVAC replacement
• Duct replacement
• Water-heater replacement
• Insulation changes
• Hardwired lighting alterations

Do not assume that “like-for-like replacement” automatically means Title 24 does not apply.

The applicable alteration requirements depend on the component and project scope.

Cosmetic Interior Work May Not Require a Title 24 Report

Purely cosmetic work that does not alter regulated energy features may not require a Title 24 energy report.

Examples may include work limited to:

• Interior painting
• Decorative finishes
• Floor coverings
• Non-energy-related cabinetry
• Decorative trim
• Other finish work that does not affect the building envelope or regulated systems

However, the project should be evaluated according to its complete scope.

A kitchen remodel described as cosmetic may also include:

• New hardwired lighting
• New windows
• New exterior doors
• Changes to exterior walls
• New insulation
• New water heating
• Mechanical-system changes

Once those elements are included, energy requirements may become relevant.

Interior Remodeling Does Not Automatically Mean Exempt

The location of the work is not the deciding factor.

An interior remodel can still alter regulated building systems.

For example, an interior commercial renovation may involve:

• New lighting fixtures
• Lighting controls
• HVAC changes
• Ventilation changes
• Electrical power distribution
• Service water heating

A residential interior remodel may involve:

• New hardwired lighting
• Mechanical-system changes
• Water-heating changes
• Exterior envelope alterations

The fact that the footprint of the building is not expanding does not by itself determine whether Title 24 applies.

Does a Project Without Added Square Footage Need a Title 24 Report?

Possibly.

Adding conditioned floor area is one common reason energy documentation is required, but it is not the only reason.

A project can leave the building footprint unchanged while altering:

• Windows
• Exterior doors
• Insulation
• Roofing
• Heating and cooling
• Ducts
• Ventilation
• Water heating
• Commercial lighting

Those changes can still fall under alteration requirements.

Therefore:

No added square footage does not automatically mean no Title 24 documentation.

Does a Project Without a Building Permit Need a Title 24 Report?

Permit requirements and Energy Code requirements are related, but they should not be treated as exactly the same question.

A project owner should not assume:

• No building permit means no Energy Code issue
• A building permit automatically means a full energy model is required

The project scope determines which energy provisions apply, while the local building department determines its permit and submittal procedures.

When in doubt, describe the actual construction work rather than deciding based solely on whether someone believes a permit is required.

Do Minor Repairs Need a Title 24 Report?

True maintenance repairs generally do not require the same Energy Code compliance documentation as additions or alterations.

However, determine whether the proposed work is legally and technically a repair.

Ask:

• Is the work maintaining an existing component?
• Is a regulated component being replaced?
• Is the building envelope changing?
• Is conditioned space changing?
• Is HVAC equipment changing?
• Are ducts being replaced or altered?
• Is water heating changing?
• Is hardwired lighting changing?

If the answer involves a regulated alteration, some form of Title 24 compliance may be required even though the owner considers the project a repair.

Does Replacing Windows Require a Title 24 Report?

Window replacement can be subject to Energy Code alteration requirements.

That does not necessarily mean every window replacement requires a complete whole-building performance report.

Depending on the project, compliance may involve window-performance requirements and applicable alteration documentation.

Relevant window information may include:

• U-factor
• Solar heat gain coefficient
• Window area
• Window type
• Glazed exterior doors

If window work is part of a larger remodel, addition, or performance-based analysis, broader calculations may be necessary.

Do not assume replacement windows are automatically exempt.

Does Reroofing Require a Title 24 Report?

Roof replacement can be treated as an alteration rather than a simple repair when Energy Code requirements apply to the roofing component.

The project may need to address applicable roof requirements without necessarily requiring the same full performance report used for new construction.

The scope may depend on factors such as:

• Building type
• Roof assembly
• Roofing material
• Insulation changes
• Conditioned versus unconditioned space
• Whether other parts of the building are being altered

A roofing contractor, designer, or property owner should verify the applicable compliance requirements before assuming reroofing is exempt.

Does HVAC Replacement Require a Title 24 Report?

HVAC replacement is a common example of work that may trigger Energy Code requirements even though no floor area is added.

Depending on the project, requirements can involve:

• Equipment efficiency
• Duct sealing
• Duct insulation
• Airflow
• Refrigerant-charge verification
• Other field-verification measures

A complete building performance model may not always be necessary for a limited HVAC alteration, but applicable compliance forms and verification requirements may still apply.

Do not interpret “no full Title 24 report” as “no Title 24 requirements.”

Does Water-Heater Replacement Require a Full Title 24 Report?

Water-heating equipment is regulated by the Energy Code.

A limited replacement may not require the same comprehensive report as a new building, but the project may still need to comply with applicable alteration or installation requirements.

Relevant information can include:

• Equipment type
• Energy source
• Efficiency
• Heat-pump water heating
• Storage or tankless configuration
• Distribution characteristics when applicable

Review the project scope before deciding that no energy documentation is necessary.

Does Replacing a Plug-In Appliance Require a Title 24 Report?

Ordinary portable or plug-in residential appliances are generally different from regulated building systems such as space conditioning, water heating, building-envelope components, and permanently installed lighting.

Replacing an ordinary plug-in appliance by itself would not normally be treated the same way as altering the building envelope or HVAC system.

However, appliances connected to regulated building systems should be evaluated according to the applicable requirements.

When the project involves electrical, mechanical, water-heating, or building alterations in addition to appliance replacement, consider the complete scope.

Does Hardwired Lighting Trigger Title 24 Requirements?

It can.

Hardwired lighting is part of the building and may be regulated by the Energy Code.

Residential and commercial lighting projects can have different requirements.

Commercial work may involve:

• Lighting power
• Fixture wattage
• Occupancy controls
• Automatic shutoff
• Daylighting controls
• Exterior lighting

A lighting-only alteration may not require the same comprehensive energy model as a new commercial building, but that does not necessarily make it exempt from Title 24 documentation.

Do Unconditioned Buildings Always Need a Title 24 Report?

Not necessarily.

Whether an unconditioned building requires energy documentation depends on the building and systems involved.

Some building-envelope and space-conditioning requirements may not apply in the same way to unconditioned space.

However, an unconditioned building should not automatically be treated as completely exempt from every Energy Code requirement.

Other regulated features may still need review depending on the project.

Examples can include:

• Lighting
• Electrical systems
• Future tenant improvements
• Other regulated building components

Also, converting an existing unconditioned space into conditioned space is a major distinction.

Once previously unconditioned space becomes conditioned, the work may be treated as an addition for Energy Code purposes.

Does Converting a Garage Into Living Space Require Title 24?

A garage conversion should not be assumed exempt simply because no new exterior square footage is being constructed.

Converting unconditioned space to conditioned living space can trigger requirements associated with newly conditioned space.

The project may involve:

• New insulation
• New windows
• New exterior doors
• Heating and cooling
• Ventilation
• Water heating
• Lighting

Garage conversions and ADUs commonly benefit from professional review before permit submission.

Visit the ADU Title 24 page for related information.

Are ADUs Ever Exempt From a Title 24 Report?

Do not assume an ADU is exempt simply because it is small.

The applicable requirements depend on whether the project is:

• A new detached ADU
• An attached ADU
• A garage conversion
• A conversion of existing conditioned space
• A conversion of existing unconditioned space

Different ADU configurations can be treated differently under the Energy Code.

The project should be reviewed according to its actual construction scope.

Does a Small Addition Always Need a Full Performance Report?

Not necessarily.

California provides prescriptive compliance paths for certain additions.

A smaller addition may be able to demonstrate compliance through applicable prescriptive forms rather than a full performance model, depending on the design and compliance path.

This is another reason the phrase “Title 24 report” can create confusion.

The project may still require a Certificate of Compliance even when a comprehensive modeled report is unnecessary.

AES can review the plans and help determine which approach is appropriate.

When Might a Residential Project Not Need a Full Title 24 Report?

A residential project may not need a full energy-modeling report when the work is outside the Energy Code or when the applicable requirements can be documented through a more limited compliance method.

Potential situations can include:

• True maintenance repairs
• Cosmetic work with no regulated energy changes
• Limited alterations addressed by the applicable prescriptive forms
• Work that does not affect conditioned space, building envelope, HVAC, water heating, or regulated lighting

However, residential projects involving any of the following should be reviewed carefully:

• New conditioned floor area
• Garage conversions
• ADUs
• New or replacement windows
• Exterior wall changes
• Roofing or insulation work
• HVAC replacement
• Duct alterations
• Water-heating changes

The project may need some level of energy-compliance documentation even if a full performance report is unnecessary.

When Might a Commercial Project Not Need a Full Title 24 Report?

Commercial projects can also vary considerably.

Purely cosmetic work that does not alter regulated energy components may not require a complete Title 24 analysis.

However, commercial tenant improvements frequently affect:

• Interior lighting
• Lighting controls
• HVAC equipment
• Ventilation
• Building-envelope components
• Service water heating
• Electrical power distribution

These changes can trigger Energy Code requirements even when the building exterior and conditioned floor area remain unchanged.

For commercial projects, review Title 24 compliance services and Title 24 energy analysis.

Does a Tenant Improvement Always Require an Energy Report?

Not every tenant improvement requires the same type of energy analysis.

The answer depends on what is changing.

A limited interior finish project may have very different requirements from a tenant improvement involving:

• New lighting
• Lighting controls
• New HVAC equipment
• Ventilation
• Exterior storefront glazing
• Water heating

Describe the complete scope before determining that Title 24 documentation is unnecessary.

What if Only One Energy-Related Component Is Being Changed?

A limited alteration may require only the compliance documentation applicable to that component.

For example, the project may involve only:

• HVAC
• Lighting
• Windows
• Roofing
• Water heating

That does not automatically require a complete whole-building performance analysis.

It also does not automatically mean no Title 24 documentation is required.

The applicable form and compliance path should be identified first.

Prescriptive Compliance May Avoid a Full Performance Model

California allows prescriptive compliance for many projects.

Under a prescriptive approach, the project follows specified efficiency requirements for applicable components rather than relying on whole-building performance tradeoffs.

Depending on the project, this can mean a full computer energy model is unnecessary.

However, applicable Certificates of Compliance and other forms may still be required.

For technical background, review the Title 24 energy calculations page.

When Is a Performance-Based Title 24 Report More Likely to Be Needed?

Performance analysis may be useful or required when the project cannot or does not follow the applicable prescriptive path.

Examples may involve:

• Complex new construction
• Custom residential design
• Large additions
• Extensive glazing
• Unusual building-envelope conditions
• Multiple mechanical systems
• Projects using efficiency tradeoffs
• Commercial designs requiring broader energy modeling

AES can review the plans and determine whether a prescriptive or performance-based approach is appropriate for the requested service.

Do HERS or Field-Verification Requirements Mean a Full Report Is Required?

Field verification is a separate issue from whether a project needs a full performance-modeled report.

Some residential additions and alterations may require field verification and diagnostic testing depending on the systems involved.

Requirements can relate to:

• Duct systems
• Airflow
• Mechanical equipment
• Other performance-sensitive features

Other projects may use compliance forms that do not require field verification.

The important point is that:

No field verification does not necessarily mean no Title 24 documentation.

Likewise:

Field verification does not necessarily mean the project requires the same comprehensive report as a new building.

Can the Building Department Require Energy Documentation Even if I Think the Project Is Exempt?

The local building department is responsible for enforcing California’s building requirements within its jurisdiction.

A plan reviewer may request clarification when:

• The project scope is unclear
• The plans alter an energy-regulated component
• The required compliance form is missing
• The plans do not identify applicable energy measures
• The project appears to have been classified incorrectly as a repair

If the building department requests Title 24 documentation, send AES:

• The complete correction notice
• The current plans
• The project description
• Any existing energy forms
• Relevant specifications

AES can review the actual scope and determine what energy-related response may be necessary.

How Do I Know Whether My Project Is Really a Repair or an Alteration?

Look beyond the name used on the contractor’s proposal.

Ask what physical work is occurring.

A project is more likely to require additional Energy Code review when it:

• Replaces a regulated building component
• Changes the building envelope
• Changes heating or cooling equipment
• Changes ductwork
• Changes water heating
• Changes permanently installed lighting
• Creates conditioned space

A true repair for maintenance purposes is treated differently.

When the distinction is unclear, submit the scope and plans for review before assuming an exemption.

Questions to Ask Before Deciding You Do Not Need a Title 24 Report

Ask:

• Is new conditioned floor area being created?
• Is unconditioned space becoming conditioned?
• Are windows or exterior doors changing?
• Are exterior walls being altered?
• Is roof or ceiling insulation changing?
• Is roofing being replaced?
• Is HVAC equipment being replaced or modified?
• Are ducts being replaced or extended?
• Is ventilation changing?
• Is the water-heating system changing?
• Is hardwired lighting being altered?
• Is commercial lighting or control equipment changing?
• Has the building department requested an energy form?

If all work is limited to non-energy-related maintenance or cosmetic finishes, a report may not be necessary.

If one or more regulated features are involved, determine the applicable compliance requirements first.

Do Not Order a Full Report Until the Scope Is Reviewed

Ordering unnecessary work wastes time and money.

At the same time, assuming that a project is exempt can lead to:

• Plan-check corrections
• Permit delays
• Revised drawings
• Last-minute calculations
• Additional consultant coordination

The practical solution is to have the scope reviewed before deciding what type of Title 24 service is required.

Alternative Energy Systems can evaluate what you are changing and explain whether the project appears to require:

• A complete Title 24 energy report
• Limited calculations
• Prescriptive compliance forms
• A revision to an existing report
• A response to building-department corrections
• No Title 24 report from AES based on the described scope

What Should You Send AES for a Requirement Review?

Provide:

• Project address
• Description of the proposed work
• Current floor plans
• Exterior elevations when applicable
• Building sections when applicable
• Window information
• Insulation information
• Roof information
• HVAC specifications
• Water-heating information
• Commercial lighting information when applicable
• Any building-department comments

Not every item will apply to every project.

AES can review the available information and explain what else is needed.

Before sending plans, review what AES will need from you.

Why Choose Alternative Energy Systems?

Alternative Energy Systems provides professional Title 24 energy-compliance support throughout California.

AES brings more than 30 years of experience to:

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

AES can review the actual project rather than assuming that every permit requires the same report.

The goal is to identify the appropriate level of energy documentation for the work being proposed.

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

Find Out Whether Your Project Needs a Title 24 Report

Call (626) 365-1518 | Alternative Energy Systems

Understanding When Is a Title 24 Report Not Required begins with separating true repairs and non-energy-related work from additions and alterations affecting regulated building components.

Some projects may not need Title 24 documentation. Others may need a limited prescriptive form rather than a full performance report. Projects involving conditioned floor area, windows, insulation, roofing, HVAC equipment, ducts, water heating, lighting, or other regulated systems should be reviewed before an exemption is assumed.

Alternative Energy Systems can review your project scope and help determine the appropriate next step.

Call (626) 365-1518 to:

• Describe the proposed work
• Ask whether a full Title 24 report appears necessary
• Determine whether limited compliance documentation may apply
• Submit plans for review
• Request a project-specific quote when calculations are needed
• Request help with existing plan-check comments

You may also begin through the contact page.

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

For current statewide requirements, review the California Energy Commission 2025 Building Energy Efficiency Standards.

Frequently Asked Questions: When Is a Title 24 Report Not Required?

When Is a Title 24 Report Not Required?

A full Title 24 report may not be required when the work is a true repair outside the Energy Code’s scope, involves only non-energy-related cosmetic work, or can be addressed through a more limited applicable compliance method. The actual project scope should be reviewed before assuming an exemption.

Does every California building permit require a Title 24 report?

No. The required energy documentation depends on the scope of work. Some projects require extensive calculations, while others may require limited forms or no Title 24 report.

Do cosmetic remodels require a Title 24 report?

Purely cosmetic work that does not change regulated energy components may not require an energy report. If windows, insulation, HVAC, water heating, lighting, or other regulated systems are changed, Title 24 requirements may apply.

Do repairs require a Title 24 report?

True repairs performed for maintenance purposes can fall outside the Energy Code. Replacing a regulated component or system may instead be considered an alteration.

Does like-for-like replacement automatically avoid Title 24?

No. Replacement of a regulated component can still be treated as an alteration even when the replacement is similar to the existing component.

Does window replacement require Title 24?

Window replacement can trigger alteration requirements. A complete whole-building model may not always be required, but applicable window-performance and compliance requirements should be reviewed.

Does reroofing require a Title 24 report?

Reroofing can be subject to Energy Code alteration requirements. Whether a full report is necessary depends on the building and project scope.

Does HVAC replacement require a Title 24 report?

HVAC replacement can trigger Energy Code compliance and field-verification requirements. A limited HVAC alteration may use specific compliance documentation rather than a full building model.

Does replacing a water heater require a full Title 24 report?

Not necessarily, but water-heating alterations can still be regulated. Determine which compliance or installation requirements apply.

Do interior renovations require Title 24?

They can when the renovation affects hardwired lighting, mechanical systems, water heating, exterior-envelope components, or other regulated features.

Does a project have to add square footage before Title 24 applies?

No. Alterations to existing buildings can trigger Energy Code requirements even when no new floor area is added.

Does converting a garage require a Title 24 report?

Garage conversions can create newly conditioned space and commonly require energy-compliance review.

Do ADUs require Title 24?

Many ADU projects require energy documentation. Requirements depend on whether the ADU is new construction, attached, detached, or a conversion.

Does every addition require a full energy model?

Not necessarily. Some additions may use an applicable prescriptive compliance path rather than a full performance model.

Can a project require Title 24 forms without needing a full report?

Yes. Certain additions and alterations may use specific Certificates of Compliance and related forms.

Do unconditioned buildings require a Title 24 report?

Requirements can be more limited for unconditioned buildings, but unconditioned status does not automatically exempt every system or project from the Energy Code.

Does replacing a plug-in appliance require a Title 24 report?

Ordinary portable appliances are different from regulated building systems. Replacing a plug-in appliance alone generally should not be confused with altering HVAC, water heating, the building envelope, or permanently installed lighting.

Can the building department still ask for Title 24 documents?

Yes. The building department may request applicable compliance documentation or clarification based on the project scope.

What if I am unsure whether my project needs a report?

Send AES a description of the proposed work and the current plans. The scope can be reviewed before you order a full report.

How do I request a requirement review?

Call Alternative Energy Systems at (626) 365-1518 and describe the project, or use the contact page to provide the available plans and project information.