INSIDE/INSIDE is a non-profit initiative founded in 2018 by the Dutch Green Building Council, Ex Interiors and NIBE in collaboration with prominent partners in the interior sector. INSIDE/INSIDE is an online platform where the sustainability of products and materials are compared in an objective and presentable way. In addition to offering this simple-to-use tool, INSIDE/INSIDE aims to further make the interior sector more sustainable by sharing latest knowledge and information in sustainability and circularity and to connect partners in our network. More information about INSIDE/INSIDE and our partners can be found here.


Both public and commercial actors are demanding more and more sustainability. While the real-estate sector has many laws, policies and labels for sustainable and circular buildings, the interior sector had fewer and a lack of oversight. We now know that interior design can have a large impact on the health and happiness of employees and the world at large. (Interior) architects, procurement, facility managers and developers play an important role in this. They are the ones that turn sustainable buildings into living environments for the users and tenants of a building.

INSIDE/INSIDE was developed from the demand of more sustainability. INSIDE/INSIDE accelerates the transition from a linear economy to a circular economy. It is an independent instrument that can be used during procurement and interior sustainability certification as for example used in BREEAM-NL, in accordance with European guidelines. The accessible and simple-to-use tool helps the interior sector to become more easily sustainable, as can be seen already happening in the property development sector.

The advantages for users

The advantages for producers

  • Promote the sustainable features of your product.
  • Save time and money as you are able to show clients clearly and objectively how sustainable are your products, in accordance to European guidelines.
  • Gain insights and improve the design and production processes.


INSIDE/INSIDE allows products and materials to be compared to make sustainable choices for interiors. The environmental impact indicator and the material circularity index (MCI) are the two indicators used.

Supplier or producers in the interior sector get their products and materials certified with a Life Cycle Assessment (LCA)*.

A Life Cycle Assessment is a way to chart environmental costs and show a circularity index. The full life cycle of a product is taken into account: from sourcing the raw materials to production, use, waste processing and re-use scenarios. A Life Cycle Assessment focusses on determining the environmental effects during the life cycle of a product, whereas a Material Circularity Index focusses on the sourcing of materials used in a product. They encourage recycling or re-using materials and recycling and re-using at the end of the life of the product.

INSIDE/INSIDE users can select interior products and materials and add them to their project calculations. Each product has detailed information and reliable data on the environmental costs and circularity index. By entering the amount or the square meters required, the platform will show at a glance what the environmental costs are, and the individual circularity index for interior products, and what factors influence the calculation.

Knowing the environmental costs and circularity index of a product or material is of great value. A product can have low environmental costs but, for example, be harder to re-use. Alternatively a material can be made from recycled sources, but have a large production cost. It is important to consider both factors to enable the user to make informed choices in relation to environmental costs as well as the future-proofing of a product in relation to re-use.

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