International Green Construction Code

International Green Construction Code
Name	International Green Construction Code
Abbreviation	IGCC
Developed by	International Code Council
First issued	2012
Latest release	2018 supplement
Jurisdiction	model code for states, provinces, municipalities
Related	International Building Code, ASHRAE 90.1, LEED

International Green Construction Code The International Green Construction Code is a model code focused on reducing environmental impacts of buildings through prescriptive and performance-based requirements. It integrates provisions from consensus standards and model codes to address energy, water, materials, indoor environmental quality, and site selection across new and renovated structures. Developed to complement the International Building Code, it is used by regulatory authorities, design professionals, and certification bodies to harmonize sustainability in construction.

Overview

The code provides model requirements for planning, design, construction, and operation of buildings to promote resource conservation and occupant health, linking to standards such as ASHRAE 90.1, ASHRAE 62.1, and UL 1897. It aims to offer an alternative path to third‑party rating systems like LEED and Green Globes by embedding sustainability into enforceable regulatory language for jurisdictions including California, New York (state), and international adopters. The document includes both mandatory provisions and optional, performance‑based compliance paths influenced by consensus organizations including ASTM International and ANSI.

Development and Governance

The code was created by the International Code Council through a consensus process involving stakeholders from government, industry, and professional groups such as the U.S. Green Building Council, American Institute of Architects, National Association of Home Builders, and utilities like Pacific Gas and Electric Company. Technical committees referenced standards from ASHRAE, National Fire Protection Association, and Underwriters Laboratories. Revisions and supplements were issued following public hearings at ICC Annual Conference events and through code publication cycles comparable to those for the International Residential Code and International Energy Conservation Code.

Scope and Key Provisions

Provisions address site selection and development, energy efficiency, water use, materials conservation, indoor environmental quality, and commissioning for commercial buildings and residential buildings. Energy chapters coordinate with ASHRAE Standard 90.1 and incorporate commissioning protocols from ASME and AIA practice guides. Water efficiency requirements reference standards from EPA programs and WaterSense, while material and waste chapters point to standards by ISO committees and ASTM International test methods. Indoor air quality measures are aligned with ASHRAE 62.1 and reference EPA indoor air programs, filtration guidance from HEPA specifications, and low‑emitting materials lists used by Green Seal and Greenguard.

Implementation and Adoption

Adoption is voluntary; jurisdictions adopt the code in whole or apply selected provisions, often alongside or as an overlay to the International Building Code or International Energy Conservation Code. Municipalities such as Seattle, Portland, Oregon, and Los Angeles have considered integrating sections into local ordinances; state agencies in California and New York (state) have evaluated alignment with state energy and greenhouse gas targets. Implementation requires coordination among code officials, permitting offices, architects from the Royal Institute of British Architects and American Institute of Architects, engineers registered with state licensing boards, and contractors certified by trade associations like Associated Builders and Contractors.

Compliance, Certification, and Enforcement

Compliance paths include prescriptive checklists, performance modeling, and mandatory commissioning; third‑party verification may be provided by organizations such as Green Seal, UL, or accredited certification bodies used by LEED projects. Enforcement rests with local code enforcement agencies and building departments, using plan review, inspections, and certificate of occupancy procedures similar to those under the International Building Code. Where jurisdictions pair the code with incentive programs from utilities like Con Edison or regional energy authorities such as Northeast Energy Efficiency Partnerships, compliance can be linked to rebates and funding mechanisms administered by entities including Department of Energy programs.

Impact and Criticism

Proponents credit the code with raising baseline environmental performance, influencing standards work by ASHRAE and triggering policy alignment with climate initiatives such as state cap-and-trade programs and municipal green building mandates. Critics argue it overlaps with voluntary rating systems like LEED and may increase upfront costs for small developers represented by the National Association of Home Builders. Others raise concerns about administrative burden for local governments, the adequacy of modeled energy savings versus measured performance as reported by agencies like the General Services Administration, and potential conflicts with historic preservation authorities such as National Trust for Historic Preservation.

Category:Building codes