Circular Economy in Construction: Keeping Plastics in the Loop
17.09.2026
Plastics protect, insulate, seal, and transport and often remain in buildings for decades. This creates a particular challenge for the circular economy: How can windows, pipes, or insulation materials be reused after a long service life, or their materials recovered at high quality? Our article explores what is needed throughout the life cycle and where circular systems in construction still reach their limits today.
According to Plastics Europe, the European construction sector consumes around 10 million metric tons of plastics every year. This corresponds to roughly 20% of total European plastics consumption. A large share of these materials remains embedded in buildings and infrastructure for decades.
This creates a particular timeline for the circular economy: Many years can pass between production, installation, and deconstruction. During this time, technical standards, regulatory requirements, and recovery options can change. These long service lives highlight what makes keeping materials in circulation particularly challenging in the construction sector.
Durability alone does not make a construction product circular. At the end of its service life, it must first be identified during deconstruction as a product or material that can be recovered, separated wherever possible, and directed to a suitable recovery pathway. Whether this succeeds depends on conditions throughout the entire life cycle.
Three factors are particularly relevant: product design, available information about materials and properties, and structures for deconstruction, collection, and recovery.
- Components and materials cannot be separated without damage.
- Material composition and ingredients are not sufficiently documented.
- Aging and contamination make high-quality recovery more difficult.
- Earlier product generations do not always meet current requirements.
- Separate collection and suitable recovery pathways are lacking.
Whether a construction product can be reused after its service life or its materials can be recovered is influenced as early as the development stage. Material selection, product design, and joining techniques affect whether components can later be disassembled and separated into individual material streams as cleanly as possible. Permanent adhesives or complex material composites can limit these options.
Alongside recyclability, durability, repairability, and ease of disassembly also come into focus. This kind of forward-looking planning is particularly relevant for construction products, as many years can pass between installation and deconstruction. Yet even a product designed with these considerations in mind can only be directed into an appropriate recovery pathway later if there is reliable information about the materials used.
After many years of use, product documentation may be missing, manufacturers may no longer exist, or detailed information about material composition may have been lost. Yet this information is important when deciding during deconstruction whether products can be reused or which recovery pathways are suitable.
Digital product information is intended to help close this gap in the future. The new EU Construction Products Regulation provides for a system of digital product passports. Product-related data is intended to remain available and become more easily accessible throughout the life cycle, supporting deconstruction, reuse, and recovery at a later stage.
However, a digital product passport does not in itself create a physical route back into circulation. For products and materials to actually be used again, appropriate structures for their return and recovery are also needed.
- The new EU Construction Products Regulation (EU) 2024/3110 has been in force since January 7, 2025.
- It establishes the framework for a system of digital product passports for construction products.
- Among other things, the product passport is intended to improve traceability along the value chain.
- Its implementation will take place gradually through further legal acts and product-specific requirements.
During deconstruction, components need to be separated wherever possible, collected, and then processed for reuse or recycling. In addition to technical feasibility, logistics, take-back systems, and sufficiently large, well-defined material streams also play an important role.
Construction and demolition waste in particular highlights the difference between recovery and keeping materials in circulation. While large mineral fractions such as concrete are already recovered to a significant extent, plastics are often not recovered but instead incinerated or landfilled, according to the European Commission’s Joint Research Centre. A high recovery rate for construction waste, therefore, says little about how effectively individual plastics are actually kept in closed loops.
Two long-lasting plastic applications illustrate just how different the conditions for this can be: PVC windows and profiles, and EPS insulation.
Case Study 1: PVC Windows and Profiles
Application
Windows and construction profiles
Material
PVC
Circular Pathway
Deconstruction → Collection → Processing → Recyclate → New products
Scale
In 2025, 180,724 metric tons of post-consumer PVC from the “Windows & Profiles” category were recycled as part of VinylPlus.
Key Feature
Existing collection and recycling structures
PVC windows and profiles show that a material’s properties alone are not enough to create a circular system. Products removed during deconstruction need to be systematically collected, with structures in place for collection, processing, and the subsequent use of the recovered material.
This requires well-defined material streams to be returned and suitable applications for the resulting recyclate. However, these conditions are not always in place for older construction products.
Case Study 2: EPS Insulation
Application
Thermal insulation
Material
Expanded polystyrene (EPS)
Circular Pathway
Deconstruction → Separate collection → Processing → Removal of problematic substances → Recovered polystyrene
Key Feature
Older insulation materials may contain HBCD, creating specific challenges for recycling.
EPS insulation presents a different challenge for long-lasting construction products. Older insulation boards may contain substances that were used when they were manufactured but are now subject to regulatory restrictions. One example is HBCD, which was previously used as a flame retardant. During deconstruction, the technical recyclability of polystyrene alone, therefore, does not determine whether the material can be used again.
Recycling these legacy materials requires processes that can separate HBCD from the material stream. Circularity in construction must therefore also account for materials manufactured under earlier technical and regulatory frameworks.
- Plan for reuse and recovery from the start: Material selection and product design influence how components can later be reused or recovered.
- Preserve material information: Reliable product information helps identify plastics even after long periods of use and direct them to the appropriate recovery pathway.
- Plan for the necessary infrastructure: Deconstruction, collection, and processing help determine whether technical circularity can translate into a functioning circular system.
The construction sector makes it particularly clear that the circular economy must address two challenges at the same time: bringing legacy materials back into circulation and creating the conditions for new products to be reused or recovered at a later stage. For the plastics industry, this means considering not only the material itself, but its entire journey through use and recovery. What is designed and installed today will shape the circular systems that are possible tomorrow.
More Articles in the Series:
How can Circular Economy succeed across different industries? This series explores the specific challenges and solutions in a range of sectors. Articles on packaging, automotive manufacturing and consumer goods have already been published, with more industries to follow.
Author: Melanie Prüser | K-Mag
Melanie Prüser has been writing for over 6 years about the stories behind innovations, technological developments, and societal challenges across various industries. For K-Mag, she explores sustainable trends, the latest innovations, and future topics along the value chain of the plastics and rubber industry.
At a glance
- Product design influences subsequent disassembly and recovery.
- Material data provides transparency throughout long service lives.
- Take-back structures return recovered plastics to the material stream.
Key Takeaway:
In construction, it may take many years before a product's actual circularity becomes apparent. Decisions made today therefore shape the circular systems of tomorrow.