Two years ago, the Center for Offsite Construction (CfOC) published a deliberately provocative whitepaper. It argued that one of the most persistent bottlenecks in U.S. offsite construction is not design talent, manufacturing capability, or demand — it is the absence of standardized connectivity between prefabricated building elements and the buildings that receive them.

That document was intentionally early. It used rough categorizations, unpolished technical assumptions, and bold analogies to spark attention and invite collaboration. Its purpose was to mobilize the right people — practitioners, regulators, manufacturers, and researchers — to test whether interoperability could unlock a Configure-to-Order (CTO) marketplace for buildings.

Today, that mobilization has taken shape.

CfOC has earned ANSI-accredited standards developer status, partnered with the International Code Council (ICC), and convened the CfOC-ICC-1220 Consensus Committee to author a national interface standard for offsite construction. The revised whitepaper marks the beginning of this formal process.

What Has Changed — And Why It Matters

The updated document is no longer simply an argument. It is a working brief designed to accelerate consensus drafting.

Where the original paper asked “Why don’t we have connectivity standards?”, the revised version asks:

“What is the smallest, defensible baseline we can publish now that enables interoperability across projects and suppliers?”

This shift reflects a core principle of standards development: progress depends on disciplined scope, not comprehensive ambition.

The revised paper introduces three major additions:

A Committee Brief defining the work ahead

An Evidence Snapshot grounding the effort in practitioner experience

Explicit Scope Boundaries for Version 1

Together, these elements transform the document from advocacy into infrastructure for action.

Focusing on Interfaces, Not Internal Design

CfOC-ICC-1220 is intended to standardize the conditions at the connection point between host buildings and pods — not the systems inside them.

Version 1 will address:

Interface geometry and orientation

Reserved penetrations (“ports”)

Access and clearance requirements

Buildability and inspectability conditions

Documentation needed to demonstrate conformance

It will not prescribe specific hardware, brands, or internal system designs.

This distinction is critical. Successful interoperability standards in other industries — from rail gauges to shipping containers to USB — stabilize external interfaces while allowing innovation behind them. The same strategy can enable a diverse ecosystem of offsite products without forcing uniformity of design.

Why a Version 1 Baseline Is Essential

Offsite construction today largely operates in an Engineer-to-Order (ETO) mode. Each project requires re-engineering of utility routing, coordination of penetrations, and negotiation of inspection expectations. This bespoke workflow limits scalability and prevents manufacturers from offering catalog-based products.

A disciplined Version 1 standard aims to change that dynamic by establishing stable assumptions that can be reused across projects.

To do so, the committee must align on four foundational decisions at the outset:

Jurisdictional Coverage
What regulatory conditions must the baseline accommodate?

Utility and Responsibility Boundaries
Which systems are standardized at the interface versus project-specific?

Orientation Families and Port Sets
What common configurations will be supported?

Buildability Constraints
What elevations, clearances, and access conditions make installations inspectable and serviceable?

Resolving these questions enables manufacturers, designers, builders, and regulators to work from a shared framework rather than starting from scratch each time.

Evidence from Practice

The revised whitepaper draws on presentations, legal analyses, and practitioner experience to document recurring friction in current delivery methods:

Repeated redesign of interface conditions

Coordination conflicts concentrated at penetrations

Approval delays due to unfamiliar configurations

Limited interchangeability across suppliers

These issues are not theoretical. They are observed across healthcare, hospitality, data center, and multifamily projects employing prefabrication.

CfOC-ICC-1220 does not assume that standardization will solve every challenge. Instead, it tests a narrower hypothesis: that stabilizing interface assumptions can reduce coordination overhead, improve predictability, and enable parallel supply chains.

Supporting a Configure-to-Order Marketplace

The long-term vision remains unchanged. A mature offsite ecosystem depends on the ability to produce repeatable products that can be deployed across diverse projects without bespoke redesign.

Standardized connectivity is a prerequisite for that transition. When interface conditions are predictable:

Manufacturers can invest in catalog offerings

Developers can specify interchangeable products

Contractors can plan installations with confidence

Regulators can evaluate familiar configurations

Lenders can assess risk more consistently

In short, interoperability expands the market for everyone involved.

Building a Durable Standard

The revised paper also clarifies governance and pathway. CfOC is working with ICC and other standards organizations to ensure the resulting specification is open, consensus-based, and legally unencumbered. The goal is not to create a proprietary system but a durable public infrastructure for the industry.

Versioning will be essential. Version 1 is intentionally limited, prioritizing clarity and inspectability over completeness. Future revisions can expand coverage as evidence accumulates and adoption grows.

The Work Ahead

Industrialized construction will not scale through isolated innovations alone. It requires shared foundations — physical, regulatory, and informational — that allow independent actors to coordinate without bespoke agreements each time.

Connectivity standards are one such foundation.

The CfOC-ICC-1220 Consensus Committee now begins the careful work of defining that baseline. Success will not come from sweeping claims, but from disciplined decisions that make interoperability practical today while enabling expansion tomorrow.

The original whitepaper was a call to action.
The revised version is a blueprint for collective execution.

The Center for Offsite Construction will continue to share updates as the committee advances toward publication of Version 1 of the CfOC-ICC-1220 interface standard.

The current version of the Center for Offsite Construction Consensus Procedures can be found here.

The Center invites interested parties to collaborate in our standards development processes, please contact Managing Director Matt Ford at mford05@nyit.edu for more information.