NECO2 - National Embodied Carbon Repository

New Zealand’s national embodied carbon data repository that supports the construction sector to make informed decisions that reduce the carbon impact of buildings.
Category Sustainability
Last updated 21 Apr 2026
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About this tool

NECO₂ (National Embodied Carbon Repository) is New Zealand’s national database for embodied carbon data in construction materials. It provides free public access to trusted, BRANZ‑verified carbon data for thousands of commonly used building products.

The tool supports architects, designers, engineers and specifiers to make informed, lower‑carbon material choices, helping reduce the overall environmental impact of buildings.

NECO₂ is developed by CIL Masterspec using more than 12 years of BRANZ‑verified carbon data. It is endorsed by the Ministry of Business, Innovation and Employment (MBIE) and supported by key industry bodies, including Registered Master Builders and the New Zealand Institute of Architects.

Check out the NECO₂ tool

Understand your building’s carbon footprint.
National Embodied Carbon Repository www.neco2.co.nz open_in_new

How to use this tool

NECO₂ is designed to be easy to access and use alongside design and assessment workflows.

You can use NECO₂ to:

  • Look up embodied carbon data for construction materials used in New Zealand
  • Compare materials based on their carbon footprint
  • Support early design decisions, when changes can have the biggest impact
  • Pair material data with tools such as BRANZ LCAQuick to assess whole‑building environmental performance

By using NECO₂ together with life cycle assessment tools, project teams can more confidently evaluate material options and identify opportunities to reduce embodied carbon before construction begins.

Understanding embodied carbon

Embodied carbon refers to the greenhouse gas emissions associated with materials across their life cycle including extraction, manufacturing, transport and construction.

NECO₂ was created to address the need for:

  • Consistent, transparent and locally relevant carbon data
  • A shared national source of information for the construction sector
  • Better alignment with New Zealand’s zero‑carbon and climate targets

NECO₂ replaces the earlier CO₂NSTRUCT tool and represents a major step forward in providing reliable embodied carbon data at a national level. It plays a key role in supporting industry‑wide progress towards lower‑carbon buildings and better environmental outcomes.