01Key facts / TL;DR
Yes, new conditioned multifamily construction typically requires Energy Code documentation.
It depends which components and areas change in an existing multifamily addition or alteration.
No, CF1R is not a universal certificate for every building containing dwellings.
It depends how dwelling areas, common systems and nonresidential uses are classified and documented.
02Start with classification, not a stack of house reports
A project with several dwellings needs a clear classification and scope before form selection. Detached buildings, attached units, common areas and mixed-use spaces are not automatically interchangeable documentation cases. Give the design team the whole building arrangement, not just a room schedule or the word “apartments.”
For a new conditioned multifamily building, expect applicable Part 6 design-compliance documentation. For additions or alterations, identify new conditioned areas and the systems/components actually changing. Existing residential occupancy does not mean no energy review, and a project’s ownership structure does not by itself choose its certificate family.
This decision guide does not invent low-rise/high-rise height thresholds or assign a category from a property listing. Establish the classification with the responsible designers and AHJ, then use the corresponding current CEC resources. A form that was accepted for a detached house is not proof that the same form fits a building with multiple units.
03Understand the form-family split before ordering CF1R
The CEC maintains a 2025 low-rise multifamily catalog containing LMCC design-compliance certificates, LMCI installation records and LMCV verification records. It separately links resources for nonresidential, hotel/motel and high-rise multifamily forms. These are real distinctions in the published resources, not a reason to guess a universal CF1R package.
Where the single-family family actually applies, CF1R, CF2R and CF3R remain useful design/installation/verification concepts. But do not paste those names over every multifamily obligation. Follow the applicable catalog, measure and registration instructions for the classified building and affected systems.
Registration and verification can depend on the measures and document family. ECC is current residential field-verification terminology; HERS may remain on older-cycle records. That terminology change does not automatically replace every multifamily form identifier, turn installation records into test results or rename nonresidential acceptance records.
CEC low-rise multifamily formsCEC nonresidential/high-rise form resources
04A multifamily scope matrix and decision checklist
Create a simple list with a line for each building, use and system.
- +Building/unit inventory: labels, classification, conditioned areas, dwelling count and existing/proposed boundaries. Do not supply only a combined development area.
- +Dwelling work: identify new units, additions and altered envelope or equipment inside existing units; distinguish repeated layouts from genuinely identical input assumptions.
- +Common systems: show central hot water, shared heating/cooling, ventilation and other common equipment, with supported schedules and served areas.
- +Common/nonresidential spaces: identify corridors, amenity areas, parking, retail or office uses and affected lighting/mechanical/envelope work; ask which documentation applies.
- +Application history: record reviewing agency, building-permit application date, current accepted reports and any phased submissions or correction comments.
05New building, existing alteration and mixed use need different questions
For a new building, the first decision is the applicable standards and coordinated design path for the full proposed scope. For a limited alteration, start with changed components and their served areas. Neither case is well described by “one report per address” or “one report per unit” without knowing the systems and form requirements.
For mixed use, identify both residential and nonresidential areas and the interfaces between them. A ground-floor tenant improvement can raise different lighting/HVAC documentation questions from the dwellings above. The project team should identify scope boundaries and keep shared systems visible rather than forcing everything into one familiar form.
For additions, document existing conditions needed by the applicable approach. Repeating a standard unit schedule does not establish concealed insulation or equipment in every retained space. Unsupported existing conditions should be resolved or clearly treated under the applicable procedure, not copied from a convenient neighboring unit.
06Worked decision: unit work plus a shared system
ILLUSTRATIVE ONLY: an existing multifamily project proposes changes inside several dwellings and replacement of common hot-water equipment. The applicant initially sends only one remodeled-unit plan. That is insufficient to identify the whole affected energy scope because the shared system serves areas outside that drawing.
The team adds a building/unit inventory, a system diagram and supported equipment information, then confirms classification and applicable records. It does not automatically produce a detached-house CF1R for each unit or claim the shared equipment is outside review. No numeric equipment threshold or passing result is supplied.
If a commercial area is also altered, that scope is identified separately for the appropriate documentation. The lesson is to map buildings, uses and systems before ordering certificates. The number of forms and model boundaries follow supported scope decisions, not a presumption about how many invoices or addresses exist.
07Dates, preliminary decisions and handoffs
The 2025 California Energy Code applies to building-permit applications on or after January 1, 2026. Confirm the AHJ-recorded date, including its treatment of phases, amendments and new applications. An earlier entitlement date or initial master plan does not automatically establish every later building’s edition.
Early review can identify classification and shared-system questions before final modeling. Keep preliminary assumptions visible until the responsible designers supply selected inputs. A compliance certificate should align with the actual named drawing revision, not a generic repeated-unit concept that later changed.
Design preparation, installation certification and required verification/acceptance are distinct responsibilities. Identify the responsible parties for the applicable families and preserve consistent records through construction. The energy preparer does not certify installation performed by others or guarantee the AHJ’s review outcome.
08Request a scoped review, not an assumed form count
Send the scope matrix, plans, schedules, application basis and any prior accepted documents. Include glazing data, assemblies, supported system information and changes to common areas. If the correct family remains unclear, state that question explicitly before requesting a final quote or permit-ready output.
New-construction and energy-modeling support can be discussed against the defined scope; nonresidential work has its own service and form guidance. Published pricing is not a promise that every multifamily arrangement has the same document count or is automatically one residential report. Clarify deliverables and exclusions through intake without inventing a fixed project fee.
New-construction scope reviewEnergy-modeling supportCommercial documentation service
09Six multifamily decisions
Is CF1R automatically the multifamily permit certificate?
No. The current CEC catalogs distinguish single-family and multifamily resources, including low-rise LMCC/LMCI/LMCV and separate nonresidential/high-rise resources. Confirm classification and scope before selecting documents.
Does each dwelling always need a separate model?
Do not assume a universal count. Building configuration, shared systems and the applicable method determine supported boundaries and records. Provide the whole project inventory for scoping.
Can repeated floor plans establish every unit’s existing conditions?
No. Similar layouts do not prove concealed assemblies, equipment or alteration scope. Supply supported conditions and identify differences rather than copying favorable assumptions.
How should a mixed-use tenant space be described?
Identify the nonresidential use, work and systems separately while showing shared interfaces. The team should determine applicable form families instead of treating all space in the building as residential.
Do common hot-water or HVAC changes matter if units stay unchanged?
They can. Identify affected shared equipment, served areas and supported design information so the applicable energy scope can be determined. Unchanged unit layouts do not establish a shared-system exemption.
Does this guide establish the low-rise/high-rise boundary?
No. It points to the current CEC resource families without inventing a classification threshold. The responsible design team and AHJ should confirm the actual building category and documentation.
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 new construction?Do I need Title 24 for commercial?Do I need Title 24 for sb9?Confirm the application’s code editionWhat to send for an energy reviewCF1R versus installation/verification recordsSee published PricingGet a Quote / upload plans