Code Strategy · Definition

What Is IBC 104.11? Alternative Methods and the NYC CCD1

6 min read · Written by DGA Fire Protection Engineering

Reviewed by a licensed Professional Engineer · NY, NJ, PA, MD, DE · Last reviewed October 2026 · Code basis: IBC 104.11 (2021), 104.2.3 (2024); NYC Admin. Code 28-103.3 and CCD1; N.J.A.C. 5:23-2.10; 34 Pa. Code 403.122; 19 NYCRR Part 1205; Maryland Building Performance Standards; Delaware Regulation 701 and county IBC adoptions

General guidance, not a code determination for any project. Confirm the adopted code and local amendments with the authority having jurisdiction.

IBC 104.11 (Section 104.2.3 in the 2024 IBC) lets the building official approve a material, design or method the code doesn’t prescribe, as long as it is at least equivalent in safety to what the code requires. In New York City, which writes its own codes, the same idea runs through a CCD1 request to the Department of Buildings for a variation under Administrative Code § 28-103.3.

A loft conversion where a second stair would cut through a cast-iron facade, a church becoming an event space with a travel distance the tables won’t accept, a 1920s warehouse with an open stair connecting three floors: in each case, literal compliance either damages the building or ends the project. This guide explains the legal authority for alternatives, how the NYC CCD1 works, the paths in New Jersey and Pennsylvania, and what makes a request approvable.

At a Glance: Alternative Compliance Paths

Definition: the IBC provision that lets the building official approve a material, design or method the code does not prescribe, on a finding that it meets the code’s intent and is at least equivalent in quality, strength, effectiveness, fire resistance, durability and safety.
Where it comes from: IBC Section 104.11 (2021), renumbered 104.2.3 in the 2024 IBC; the International Fire Code carries a matching section.
Also called: alternative materials, design and methods; alternate means and methods; equivalency; in New York City, a CCD1 Construction Code Determination, including variations under Administrative Code § 28-103.3.
Who decides: the building or fire code official; in NYC the DOB borough office with appeal to Technical Affairs and the BSA; in New Jersey the construction official under N.J.A.C. 5:23-2.10; in Pennsylvania the municipal board of appeals under 34 Pa. Code § 403.122.
The standard: equivalence. The alternative plus its compensating features has to be at least as safe as what the code prescribes, and cost alone does not qualify.
Common confusion: an approval applies only to the job it was granted for and is not a precedent, and an alternative method is not a waiver: the hazard the rule addresses still has to be handled.

What IBC 104.11 Says, and Where It Moved in 2024

IBC 104.11, Alternative Materials, Design and Methods of Construction and Equipment, states that the code is not meant to prevent a material, design or method it does not specifically prescribe, provided the alternative is approved. The building official approves it on finding that it meets the intent of the code and is at least equivalent in quality, strength, effectiveness, fire resistance, durability and safety. If the official does not approve, the reasons have to be given in writing.

In the 2024 IBC the provision moved to Section 104.2.3. It keeps the equivalence test and the written response, and adds a path for designs prepared under the ICC Performance Code. The section number matters because New Jersey and New York State outside the city now enforce codes based on the 2024 IBC, while Pennsylvania, Maryland and Delaware are still on the 2021 or 2018 editions.

Figure 1: The Equivalence Test

Under IBC 104.11 an alternative is approved when the alternative plus its compensating features is at least equivalent in quality, strength, effectiveness, fire resistance, durability and safety to the prescriptive requirement. Whether the alternative is cheaper is not part of the test; whether the scale stays level is.

The NYC CCD1: Asking DOB for a Determination

New York City writes its own Construction Codes, so IBC section numbers don’t apply directly. When a job can’t meet a provision as written, or the code’s meaning for a specific condition is unclear, the applicant files a CCD1, the Construction Code Determination form, with the Department of Buildings. The form covers interpretations and clarifications as well as variations of the Building Code under § 28-103.3, which lets the commissioner vary a requirement in a specific case under the City Charter. The request carries the seal of a registered design professional and is filed in DOB NOW under Determinations, with the fee DOB lists for it.

Figure 2: The CCD1 Path

Objection, or a provision the building can’t meet

Is the issue what the code means, or whether it can be varied?

MeaningCCD1 interpretationDOB states how the provision applies to this job

Variation

§ 28-103.3CCD1 variationEquivalent safety shown by engineering

If deniedAppealTechnical Affairs, then the Board of Standards and Appeals

A NYC CCD1 request takes one of 2 forms: an interpretation, where DOB states how a provision applies to the job, or a variation under Administrative Code § 28-103.3, where equivalent safety is shown by engineering. A denial can be appealed to Technical Affairs and then the Board of Standards and Appeals, and a pre-determination can test the approach before the design is fully drawn.

A CCD1 decision applies to the job it was filed for. It is not a precedent for the next building, so every request has to stand on its own engineering.

Figure 3: A CCD1 From Start to Finish

Pre-determinationTest the approach before the design is fully drawn

CCD1 filingSealed request in DOB NOW, with the engineering attached

Decision or appealBorough decision; Technical Affairs and the BSA if needed

A CCD1 runs through a pre-determination, a sealed filing in DOB NOW with the engineering attached, and a borough decision, with Technical Affairs and the BSA available on appeal. The earlier the question is asked, the cheaper the answer.

New Jersey, Pennsylvania, New York State, Maryland and Delaware

Jurisdiction	Authority	Who decides
Model codes	IBC 104.11 (2021), 104.2.3 (2024), and the IFC’s matching section	The building or fire code official
New York City	CCD1, including variations under Admin. Code § 28-103.3	DOB borough office; appeals to Technical Affairs and the BSA
New Jersey	Variations under N.J.A.C. 5:23-2.10	The construction official, with appeal to the construction board of appeals
Pennsylvania	Appeals and variances under 34 Pa. Code § 403.122	The municipal board of appeals
New York State outside NYC	IBC 104.2.3 as adopted in the 2025 Uniform Code, and variances from the Uniform Code under 19 NYCRR Part 1205	The local code official; variances by a regional board of review
Maryland	IBC 104.11 (2021) under the Maryland Building Performance Standards and county amendments; NFPA 1 equivalencies (Section 1.4)	The local building official or fire official, with local appeal boards behind them
Delaware	IBC 104.11 as adopted by the county or municipality (2021 in New Castle and Sussex, 2018 in Kent and Wilmington); NFPA 1 equivalencies under State Fire Prevention Regulation 701	The local building official; the State Fire Marshal, with appeal to the State Fire Prevention Commission

Editions as of October 2026. Confirm the adopted code and the filing route with the official before preparing the request.

New Jersey’s construction official can grant a variation when strict compliance is impractical, the applicant shows the practical difficulty, and the alternative adequately protects the occupants. Pennsylvania does not adopt the IBC’s administrative chapter. Instead, 34 Pa. Code Chapter 403 governs administration, and § 403.122 lets the board of appeals hear a request where an equivalent form of construction is proposed, weighing compensating features.

What Makes an Alternative Approvable

Figure 4: Building the Request

1Name the exact provision and how the design departs from it

2State the practical difficulty: structure, landmark, geometry

3List the compensating features

4Prove equivalence with calculations or modeling

5Test the approach early: pre-determination or meeting

6File, answer questions, and build what was approved

An approvable request is built in 6 steps: name the provision, state the practical difficulty, list the compensating features, prove equivalence with calculations or modeling, test the approach early, and file and build what was approved. Vague requests come back; specific ones get decided.

Figure 5: Strong vs Weak Requests

Strengthens it

A real constraint: structure, landmark fabric, existing geometry
Compensating features aimed at the hazard the rule addresses
Calculations or modeling the official can check
A clear commitment to maintain the features

Weakens it

Cost or schedule as the only reason
No exact code section cited
Features that don’t address the rule’s purpose
Equivalence asserted rather than shown

A request is strengthened by a real constraint, compensating features aimed at the hazard the rule addresses, calculations or modeling the official can check, and a commitment to maintain the features; it is weakened by cost as the only reason, no code section cited, features that miss the rule’s purpose, and equivalence asserted rather than shown. Officials approve on evidence they can defend later.

Departure	Typical compensating features	Engineering that supports it
Unenclosed opening between floors	Draft curtain and closely spaced sprinklers at the opening, smoke detection, automatic closure	Smoke filling and tenability analysis
Travel distance over the limit	Full sprinkler coverage, enhanced alarm and voice notification, occupant load cap	Egress timing: available vs required safe egress time
Rated element that can’t be rated	Sprinkler protection of the element and added protection on the exposed side	Fire exposure and protection calculations
One exit where the code wants two	Occupant load limit, sprinklers, alarm, protected exit path	Egress capacity and timing analysis

Before Filing

Check that the alternative is something the project will maintain for the life of the building. An approval that depends on a draft curtain, an occupant load cap or a smoke control sequence is only as good as the owner’s ability to keep those features in service, and the next inspector will ask.

DGA prepares equivalency reports, CCD1 requests and variation applications across New York, New Jersey, Pennsylvania, Maryland and Delaware. Project briefs get confirmation and preliminary code feedback within one business day. See where DGA works →

Key Takeaway: IBC 104.11, now 104.2.3, and the NYC CCD1 rest on the same idea: an alternative is approved on evidence. Name the provision, show why compliance isn’t reasonable, list the compensating features, and prove equivalence with engineering the official can rely on.

Frequently Asked Questions

What does IBC 104.11 allow?

It lets the building official approve a material, design or method the code doesn’t prescribe, if the alternative meets the intent of the code and is at least equivalent in quality, strength, effectiveness, fire resistance, durability and safety.

Where is IBC 104.11 in the 2024 IBC?

Section 104.2.3. It keeps the equivalence test and the written response on denial, and adds a path for designs under the ICC Performance Code.

What is a NYC CCD1 request?

A Construction Code Determination request to the Department of Buildings. It asks DOB to interpret a provision for a specific job or to vary it under Administrative Code § 28-103.3, and it is filed in DOB NOW with a design professional’s seal.

Is cost a valid reason for an alternative?

No, rarely on its own. Officials look for a practical difficulty such as a structural conflict, landmark restrictions or existing geometry, paired with engineering that shows equal safety.

How does New Jersey handle alternatives?

Through a variation under N.J.A.C. 5:23-2.10. The construction official can grant it when strict compliance is impractical and the alternative adequately protects the occupants.