01Key facts / TL;DR
It depends whether the work is a repair, replacement, recover or a broader roof/ceiling alteration.
Yes, reroofing can trigger Energy Code requirements without a new dwelling or added floor area.
No, roofing work does not automatically mean a whole-house performance model is required.
It depends which slope, location, extent-of-work provisions and supported exceptions apply.
02A reroof decision needs more than the material name
A localized repair, a new roof covering and work that exposes or changes an assembly are different scopes. The CEC’s existing-building chapter treats reroofing and roof/ceiling alterations within the applicable energy framework. Calling a project “maintenance” or “just shingles” does not by itself establish its documentation requirements.
For a single-family reroof, start with the actual area and type of work, roof slopes, conditioned boundaries and supported location. The answer may be a focused alteration/documentation task rather than a full-house energy model. Conversely, no added floor area does not mean no applicable roof-product or assembly requirements.
This guide does not supply a local permit exemption, structural specification or universal cool-roof threshold. The AHJ and responsible roofing/design team should identify the applicable provisions and requested evidence before products are ordered. A sales description that a material is “energy efficient” is not a complete compliance basis.
03A roof scope and application-date checklist
Record these facts on a plan or written scope so the preparer can identify the actual question.
- +Building and boundary: single-family, multifamily or nonresidential; conditioned space below, attic/rafter configuration and any separate building. Do not copy requirements from another classification.
- +Extent: existing roof area, proposed affected area and what is repaired, removed, replaced, recovered or coated. Show different roof portions rather than providing one unsupported percentage.
- +Slope and assemblies: identify low-/steep-slope portions, retained/proposed coverings and whether sheathing, insulation, attic conditions or roof/ceiling access changes.
- +Location: exact property and supported climate-zone information from plans/AHJ or the CEC tool. A county-wide assumption is not sufficient for a parcel-specific requirement.
- +Permit basis and evidence: AHJ-recorded application date, product identification/ratings, supported existing conditions for any exception and the responsible designer/roofer.
04What “cool roof” describes—and what it does not
Cool-roof provisions concern the roofing product’s ability to reflect solar energy and emit heat. Solar reflectance, thermal emittance and solar reflectance index describe related but different characteristics. Applicable provisions can use aged reflectance information rather than only an attractive initial value in a brochure.
The CEC envelope and existing-building guidance distinguish requirements by scope, roof characteristics and location. Applicable exceptions or alternative treatments need supporting facts. Do not treat a product’s color, a “cool” marketing label or a neighbor’s accepted roof as evidence that this installation satisfies the selected path.
Ask for the actual rated product/configuration and documentation the applicable procedure needs. The preparer should be able to trace the proposed selection to its supported values and affected roof portion. A generic product-family sheet may contain multiple colors or variants and not identify the material being installed.
05Roof covering, insulation and attic work are separate scope questions
Changing the covering is not necessarily the same task as altering the roof/ceiling assembly. If work exposes framing or changes insulation and other attic conditions, identify that work explicitly. The CEC existing-building chapter discusses roof/ceiling and attic alterations as well as roof-product questions.
A claim that existing insulation or another condition supports an exception needs evidence and the correct applicable provision. Do not invent an insulation value from building age or assume an inaccessible assembly has a favorable rating. Tell the team what is known, unknown and proposed for investigation.
The roof contractor and responsible designers handle construction, structural and safety matters. Energy-document preparation does not establish safe attachment, moisture behavior, fire classification or repair suitability. An energy certificate is not a substitute for the other permit disciplines or a warranty for the roofing product.
06Which forms fit a roof-only request?
Where the single-family family applies, use current CEC alteration documentation appropriate to the actual scope and compliance method. CF1R is the design-compliance stage; applicable CF2R addresses installation. A cool-roof rating label supports inputs but is not itself the complete permit certificate.
Required ECC verification/CF3R applies to selected measures when required, not automatically to every roof-only job. ECC is current terminology, with HERS relevant to older-cycle records. The CEC catalog distinguishes registered and nonregistered pathways; do not assume every blank form is valid for the selected measures.
For a commercial roof or multifamily building, establish classification before borrowing house forms. Nonresidential roof requirements and document families should not be used as a shortcut to assign single-family limits. Likewise, a house’s certificate does not automatically document a commercial reroof.
CEC single-family form catalogResidential documentation serviceCommercial documentation service
07Worked decision: two slopes and an unsupported product claim
ILLUSTRATIVE ONLY: a homeowner proposes replacement covering over two roof portions with different slopes. The first quote says only “cool shingles.” The preparer requests the affected areas, slopes, supported climate-zone basis, actual product ratings and whether the work changes insulation or roof/ceiling conditions.
The team checks the applicable provisions separately for the affected portions and identifies the needed documentation. It does not invent one statewide reflectance number, assign a climate zone from the county name or assume a partial replacement qualifies for an exception. No passing result or local permit rule is supplied.
If solar equipment is removed/reinstalled or changed during the reroof, identify that separate work and its responsible participants. PV and roofing records answer different questions; an existing array is not a blanket exemption for every surrounding roofing product or building requirement.
08Confirm the edition and ask a focused question
The 2025 California Energy Code applies to permit applications on or after January 1, 2026. Confirm the AHJ-recorded date and its treatment of amendments or a new application. A leak, insurance claim or contractor quotation date does not establish the applicable edition.
Send the roof scope, area/slope information, proposed product evidence and supported existing conditions. Ask whether the actual submission needs a focused alteration record, additional assembly information or broader analysis. Do not order a complete house model solely because the word Title 24 appears in a roofing comment.
For reviewer corrections, attach the complete comments and reviewed package with the revised roofing selection. Keep the schedule, product evidence and applicable documents aligned. Preparation does not control contractor scheduling, agency staffing or permit approval, and testing/agency fees remain separate from report scope.
Roof alterations within remodel documentationPlan-check corrections
09Six roof decisions
Does roof work without new floor area avoid Part 6?
Not automatically. Reroofing and roof/ceiling alterations can have applicable requirements. Identify the actual work, building type, location and needed documentation rather than relying only on unchanged area.
Does every small roof repair need a whole-house energy model?
No universal model requirement is established here. Distinguish repair from replacement/recover and broader assembly work, then confirm the applicable submission evidence with the AHJ.
Is a light-colored product enough to show a cool roof?
No. Provide supported product identity and applicable reflectance/emittance or SRI evidence. A color description or marketing label is not a complete compliance record.
Can one roof value be applied across different slopes?
Do not assume so. Show the affected portions and slopes so the responsible team can check the applicable provisions. Supported exceptions and product data must match the actual work.
Does roof replacement always require an ECC-Rater visit?
Not automatically. Identify the actual measures and required verification. CF1R preparation, installer certification and applicable ECC field verification are separate responsibilities.
Can I use a commercial cool-roof summary for my house?
Do not assign requirements across classifications. Use the current single-family guidance for the applicable house scope and confirm the exact provisions; multifamily and nonresidential resources have their own context.
10Choose the next documentation step
Use the published residential/commercial square-footage menu to understand report pricing, then send a scoped request rather than assuming a full model is necessary. Field testing, acceptance testing, registry fees, CALGreen and AHJ permit fees are separate. Intake is not payment, production acceptance or permit approval. This is educational information, not legal advice; confirm the applicable requirements and documentation with the authority having jurisdiction (AHJ).
Start with the Title 24 decision hubDo I need Title 24 for remodel?Do I need Title 24 for solar?Do I need Title 24 for addition?Confirm the application’s code editionWhat to send for an energy reviewCF1R versus installation/verification recordsSee published PricingGet a Quote / upload plans
Sources
- CEC: 2025 Energy Code and January 1, 2026 effective date
- CEC: 2025 single-family manual, Chapter 9 — additions, alterations and repairs
- CEC 2025 single-family compliance manual, Chapter 3 — Building Envelope
- CEC: 2025 single-family CF1R, CF2R and CF3R forms
- CEC: climate zone tool, maps and location guidance
- CEC: Energy Code Compliance (ECC) Program and transition questions