Dallas Energy Code Multifamily: 2021 IECC, Compliance Path Forms, and When to Study First

If you are building multifamily inside the City of Dallas, a statewide Texas summary, a Houston package, or an Austin package is the wrong filing target. Dallas adopted the 2021 International Energy Conservation Code with Dallas amendments as City Code Chapter 59, the Dallas Energy Conservation Code, effective May 12, 2023. Dallas also runs its own paperwork: a compliance path form signed by a City-registered third-party energy provider goes in with the permit application, and a compliance certificate has to be on file before the building final. Teams get caught when they model to the 2015 state floor, assume the green building checklist covers energy, or find out about the path form at intake.

This page is the Dallas Energy Code door for multifamily developers. For the statewide Texas commercial code path (the 2015 IECC floor, ASHRAE pairings, and why mid-rise is not HERS-first), see ASHRAE COMcheck Texas multifamily. For the Texas study door, see energy code feasibility study Texas. Other Texas city doors already live: Houston Energy Code multifamily and Austin Energy Code multifamily. City-code door in another ECC priority market: NYC Energy Code multifamily. Program, testing, and modeling context: ENERGY STAR Multifamily New Construction, blower door testing for multifamily buildings, and multifamily energy modeling.

What Code Applies in Dallas Right Now

Per the City of Dallas Current City Code page, Ordinance No. 32425 (the Chapter 59 ordinance adopting the 2021 IECC), and the City's 2021 commercial energy code process page (primary sources; confirm with the City before you file):

• Chapter 59, the Dallas Energy Conservation Code, adopts the 2021 International Energy Conservation Code with Dallas amendments.
• The City lists its 2021 International Code Council codes as effective May 12, 2023. Ordinance No. 32425 was passed by City Council on April 12, 2023 and takes effect May 12, 2023.
• Chapter 61, the Dallas Green Construction Code, is the 2015 International Green Construction Code with Dallas amendments. It is a separate program from the energy code (more on that below).
• Dallas's commercial compliance path form for the 2021 IECC lists ASHRAE 90.1-2019 as the ASHRAE option, not ASHRAE 90.1-2022.

Houston also enforces the 2021 IECC and ASHRAE 90.1-2019, with its own Houston amendments and its own COMcheck intake rules. Austin moved to the 2024 IECC and ASHRAE 90.1-2022 on July 10, 2025. Statewide Texas still sits on a 2015 IECC floor for many jurisdictions. Same state, three different city stacks and three different submittal processes. Use the City of Dallas Development Services pages as the source of truth for your filing date, not a blog summary.

Residential vs Commercial Split for Multifamily

Dallas's Chapter 59 amendments add definitions but do not rewrite the 2021 IECC residential building definition. Under the 2021 IECC, Group R-2, R-3, and R-4 buildings three stories or less above grade plane use the residential provisions. Taller apartment buildings use the commercial provisions.

Two Dallas details matter for small and mid-size multifamily:

• Consolidated dwellings. Ordinance No. 33099 (passed April 28, 2025, effective May 23, 2025) renamed Chapter 57 the Dallas One- to Eight-Family Dwelling Code and added a "consolidated dwelling" category for residential-only buildings with three to eight dwelling units, not more than three stories. Its energy section sends those buildings back to Section C101.5 of the Dallas Energy Conservation Code. A building permitted under the dwelling code still answers to Chapter 59 for energy.
• Podium and mixed-use projects. Retail, amenity, lobby, corridor, parking, and other non-dwelling areas follow commercial documentation even when the team thinks of the job as "apartments."

That split decides whether you are looking at residential envelope tables and an ERI path, or a commercial package with COMcheck-style reports and performance modeling. Confirm it with Dallas plan review before anyone models.

The Dallas Commercial Compliance Path Form

For commercial new construction, additions, and first-time tenant finish-outs filed on or after May 12, 2023, Dallas requires the Dallas Commercial Energy Compliance Path form with the building permit application, signed by a City-registered third-party energy provider. The form makes you pick one path:

1. Option 1A, ASHRAE 90.1-2019 prescriptive. Sections 5 through 10 (envelope, HVAC, service water heating, power, lighting, other equipment). COMcheck may be used to show compliance.
2. Option 1B, ASHRAE 90.1-2019 Section 11 Energy Cost Budget Method. Design energy cost below the energy cost budget, with the Section 4.2.5 verification, testing, and commissioning requirements.
3. Option 2, IECC prescriptive. C402 through C405, plus 10 credits of additional efficiency under C406. COMcheck may be used to show compliance.
4. Option 3, Total Building Performance. Section C407, with building energy cost at or below 85 percent of the standard reference design.

The form also flags C408 system commissioning documentation for mechanical cooling systems over 480,000 Btu/h, combined service water heating and space heating systems over 600,000 Btu/h, and automatic lighting controls. The signer certifies the construction documents were reviewed for insulation R-values, fenestration U-factors and SHGC, mechanical and water heating equipment efficiencies, duct sealing, lighting schedules, daylight zones, and air sealing details.

At the end of the job, the third-party provider submits the Dallas Commercial Energy Compliance Certificate by email or through DevelopDallas. City staff sign off on the "Energy" process before the building final inspection can be approved, and a temporary certificate of occupancy needs the certificate with the TCO portion checked. New one- and two-family residential construction follows a parallel process with its own residential compliance path form and certificate.

Dallas Amendments Multifamily Teams Miss

Ordinance No. 32425 changes several 2021 IECC sections that hit apartment buildings directly:

• Dwelling unit enclosure testing (commercial, C402.5.2). Units are tested separately with an unguarded blower door to a maximum of 0.30 cfm per square foot of testing unit enclosure area at 50 Pa. With eight or more testing units, the greater of seven units or 20 percent are tested, including a top floor unit, a ground floor unit, a middle floor unit, and the largest unit. Dallas raises the retest for each failed unit to three additional units, up from two in the model code.
• Residential R-2 sampling. Dallas adds matching sampling rules for R-2 dwelling units on envelope air leakage (R402.4.1.4), duct leakage (R403.3.8), and mechanical ventilation testing (R403.6.4): the greater of seven units or 20 percent, with three more units tested for each failure.
• ERI targets on a schedule. Dallas replaces the 2021 IECC Energy Rating Index table with dated tables. From September 1, 2025 to August 31, 2028 the maximum ERI is 57 in climate zones 2 and 3. On or after September 1, 2028 it drops to 55.
• Additional efficiency packages deleted. Section R408 (additional efficiency package options) is deleted from the residential provisions.
• Alternative compliance. Dallas adds C102.1.2 and R102.1.2: a building certified by an accredited energy efficiency program and determined by the Energy Systems Laboratory to comply may be accepted at the code official's option, and EPA ENERGY STAR certification of energy code equivalency is considered in compliance. On the residential side, each one- and two-family dwelling still has to be tested for air and duct leakage regardless of program.

Treat those as path facts, not a design checklist. The adopted ordinance text and the City's forms are the numbers to design against.

Energy Code and Green Building Are Separate in Dallas

The City's own green building overview puts it plainly: energy and green are not the same. Chapter 61 (2015 IgCC with Dallas amendments) has its own plan review and inspections. The Chapter 61 commercial checklist says buildings shall be designed and constructed to the energy provisions of the Dallas Energy Code, and that IECC compliance must be demonstrated separately by a City-registered third-party energy inspector. Passing the green checklist does not file your energy compliance.

Proof From ECC Studies (Method, Not Dallas Invoices)

ECC does not publish a Dallas or Texas dollar-per-square-foot average, and we do not have a Dallas energy-code invoice to present as your number. We cite other studies as proof of method, and we label them that way.

On our 267-unit Cromwell, CT study (CS68), two buildings up to six stories (272,036 square feet) were filed on IECC commercial provisions using ASHRAE 90.1-2019 Appendix G, the same ASHRAE year on the Dallas compliance path form. The recommended all-electric tier came in at about $35.23 per square foot net and captured a $1,500 per unit Energize CT incentive ($400,500). Those are Connecticut commercial-code outcomes, not Dallas invoices. They show the order: lock the path, rank the packages, then document the winner.

On a 112-unit Revere, MA study (CS57), a seven-story mixed-use building kept dwelling units on a Massachusetts Stretch HERS path and still called for a COMcheck report for all common and support areas, plus ASHRAE 62.1 ventilation calculations and lighting power density calculations. The recommended ductless package landed at about $42.52 per square foot net. Those are Massachusetts outcomes. We cite them as proof that mixed-use paperwork splits before modeling hours, not as a Dallas price.

Common Mistakes on Dallas Multifamily Energy Filings

• Modeling to the statewide floor. Dallas enforces the 2021 IECC with Dallas amendments, not the 2015 state minimum.
• Copying an Austin package. Austin is on the 2024 IECC and ASHRAE 90.1-2022. Dallas's form lists ASHRAE 90.1-2019 and the 2021 IECC paths.
• Showing up without the path form. Commercial new construction, additions, and first-time finish-outs need the signed compliance path form with the permit application.
• Assuming Chapter 61 covers energy. Green building review and energy compliance are separate activities with separate sign-offs.
• Budgeting the model-code retest. Dallas tests three more units for each failed unit, not two. Plan air sealing and testing with that in mind.
• Buying COMcheck or ERI hours before the path is locked. The study should settle residential vs commercial, which form option you will sign, and the ERI or performance target, then the paperwork follows.

When to Study First

Settle the Dallas path before anyone buys REScheck, COMcheck, ERI, or whole-building modeling hours:

1. Confirm the permit address is inside the City of Dallas and on the Chapter 59 code in force for your filing date (2021 IECC with Dallas amendments since May 12, 2023)
2. Lock the residential vs commercial split (three stories or less for Group R-2 / R-3 / R-4 on the residential provisions, consolidated dwellings, and commercial documentation for nonresidential areas)
3. Pick the compliance path form option for each commercial portion: ASHRAE 90.1-2019 prescriptive, ASHRAE 90.1-2019 Energy Cost Budget, IECC prescriptive with C406 credits, or C407 total building performance
4. For residential portions, check the ERI target for your dates (57 through August 31, 2028, then 55) and the R-2 sampling rules
5. Model envelope and HVAC packages side by side against that path, including ENERGY STAR Multifamily New Construction where you plan to enroll
6. Line up a City-registered third-party energy provider, then produce the path form, reports, testing, and certificate against the locked plan

That comparison is what a free feasibility study produces. For the Texas study method, see energy code feasibility study Texas. For how modeling works on apartment buildings in general, see multifamily energy modeling. If the path is already chosen and you need COMchecks, modeling, inspections, or testing, see ECC services.

Bottom Line

The Dallas energy code for multifamily is the 2021 IECC with Dallas amendments (Chapter 59), effective May 12, 2023, with ASHRAE 90.1-2019 options on the commercial compliance path form, a dated ERI schedule, tighter retest sampling, and a registered third-party energy provider on the path form and the certificate. Green building review under Chapter 61 is a separate track. This is the Dallas city-code door, not the statewide Texas code-path page, not the Houston or Austin city doors, and not the Texas study door. Lock the split, the form option, and the targets first, then buy the paperwork that matches the plan.