5 Startups Redefining the Circular Economy in Construction

Constructing the Future

5 startups redefining the circular economy in construction — and proving it's commercially viable.

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40%

of global CO₂ from buildings and construction

IEA, 2023

8%

of global CO₂ from cement production alone

Chatham House, 2018

90%

of demolition waste ends up in a landfill

Ellen MacArthur Foundation

The construction industry sits at the center of the climate crisis — consuming vast resources, producing enormous amounts of carbon, and generating waste on an industrial scale. Cement production alone is responsible for 8% of global CO₂ emissions (Chatham House, 2018), and the average building demolition sends over 90% of its materials straight to landfill ( Ellen MacArthur Foundation).

A new generation of climate-tech startups is now challenging this model head-on. By applying circular economy principles—turning waste into materials, capturing carbon in concrete, and enabling resource reuse—they are not just reducing emissions—they are turning those reductions into business models. The five companies below represent the most promising of this cohort, spanning material innovation, lifecycle management, and bio-circular solutions—

01 — CarbiCrete

Carbon-negative concrete: Turning emissions into stone

CarbiCrete, a Montreal-based Canadian company, has developed a method to produce cement-free, carbon-negative precast concrete products.

How It Works

CarbiCrete replaces cement with steel slag, an industrial by-product, and cures the material with CO₂. The reaction forms calcium carbonate, permanently locking carbon into the concrete.

Revenue Drivers

• Licensing technology to concrete manufacturers

• Carbon removal credits

• Concrete product partnerships

Growth Areas

• Scaling to 25,000 units per day.

• U.S. market entry via Gagne & Son; licensing is active.

• High-value revenue from permanent CO₂ removal.

  
  

CarbiCrete has raised over $40 million to scale its cement-free technology. Because the process is entirely cement-free, the company is insulated from rising cement costs, making it a preferred partner for major developers across North America and Europe.

Founded

2016

HQ

Canada

Founders

Dr. Mehrdad Mahoutian and Chris Stern

02 — Betolar

AI-enabled geopolymer binders from industrial waste

Founded in Finland in 2016, Betolar is on a mission to convert industrial waste into high-performance circular cement. Operating at the intersection of materials science and artificial intelligence, the company runs two core technology streams: metal extraction and its proprietary Geoprime geopolymer platform.

How It Works

Through its metal-extraction technology, Betolar recovers strategic metals from slag and mine tailings with 99% efficiency. The residual material from this process is then repurposed into low-carbon circular cement, meaning virtually nothing goes to waste.

• Converts unutilised industrial side streams into valuable materials

• Produces low-carbon, high-performance binders

• Reduces carbon emissions by up to 80% compared to traditional cement

• Lessens dependence on virgin raw materials, advancing the circular economy

  
  

Revenue Drivers

• Licensing the Geoprime AI platform

• Industrial waste processing

• Partnerships with concrete manufacturers

Growth Areas

• Asian construction markets

• More AI material optimization

• Scaling low-carbon concrete production

Founded

2016

HQ

Finland

Founder

Juha Leppänen

03 — Carbon Limit

Self-decarbonizing concrete: Making buildings breathe.

A South Florida startup, Carbon Limit, has developed a groundbreaking concrete additive called CaptureCrete — a carbon-negative powder that actively absorbs CO₂ from the surrounding atmosphere. 

How It Works

When mixed into concrete, CaptureCrete mineralises atmospheric CO₂ directly into the building's structure. This transforms every structure built with it into a permanent carbon sink — simultaneously reducing carbon footprints, strengthening the concrete, and generating verifiable, high-quality carbon credits.

The company licenses its formula to cement and concrete producers and manages the entire carbon credit generation and verification process on their behalf.

"We use special minerals from nature that actually give concrete the ability to attract CO₂ like a magnet into the concrete and then permanently store it inside there."

-Tim Sperry, Co-Founder, Carbon Limit

Revenue Drivers

• Concrete additives for construction companies

• Carbon credit generation through captured CO₂

• Partnerships with infrastructure developers

  
  

The additive integrates easily into existing concrete production systems, giving it strong potential for commercialization in large infrastructure markets.

Growth Areas

• Expansion into global concrete and infrastructure markets

• Development of carbon-removal concrete technologies

• Partnerships with construction material manufacturers

Founded

2020

HQ

USA

Founders

Oro Padron & Tim Sperry

04 — Concular

Circular construction: The digital marketplace for material reuse

Concular is a leading German PropTech company enabling the circular economy in construction by digitising building materials. Where most demolition projects end up in landfills, Concular's platform ensures that buildings are not demolished—they are deconstructed.

How It Works

Concular creates Digital Material Passports for every building on its platform.a permanent digital record that travels with the material through its entire life.

What is a Digital Material Passport? It is means to identify a material's quality, origin, and location — but goes much further. It documents chemical ingredients, product compositions, recycling proportions, life cycle assessment figures, and recyclability data. These passports catalogue every beam, stone, panel, and fixture, allowing them to be tracked, valued, and resold on Concular's Circular Marketplace when a structure reaches the end of life. Nothing is wasted; everything is rehomed. All this simplifies both finding the correct material and calculating the circular and financial residual value of a building. 

Impact: Upcoming EU 2026 regulations require full material traceability — making Concular's platform increasingly essential.

Revenue Drivers

• Digital platform marketplace for reused materials

• Construction project consulting

• Circular building services for developers

Growth Areas

• Digital platforms for circular construction supply chains

• Expansion into European real estate and construction markets

• Circular building consulting for developers

Why It Matters: By treating buildings as 'material banks' rather than future landfill, Concular makes the circular economy financially profitable for developers.

Founded

2020

HQ

Germany

Founders

Dominik Campanella (CEO), Julius Schaufele (CPO), & Marc Haines

05 — GreenJams

Upcycled masonry: Turning crop waste into climate action

GreenJams is an Indian startup founded in 2019 that produces Agrocrete — a carbon-negative construction material made from agricultural waste.

How It Works

By converting crop residue and industrial by-products into building blocks, GreenJams tackles two environmental problems simultaneously: agricultural waste burning and carbon-intensive construction.

Impact: By using crop residues, GreenJams prevents the air pollution caused by crop residue burning — which costs India almost $27 billion due to public health and worker productivity losses. In one year alone, the company prevented 600 tonnes of paddy straw from burning and removed 3,000 tonnes of CO₂ from the atmosphere.

Revenue Drivers

• Manufacturing and selling Agrocrete blocks

• Supplying sustainable construction materials to developers

• Collaborations with infrastructure developers

Growth Areas

• Scaling sustainable construction material production

• Expanding into green infrastructure projects across South Asia

• Advancing carbon-negative building technologies

GreenJams reported revenue of $120,000 USD as of March 2025 — early-stage, but meaningful validation in a market where climate-focused construction materials have historically struggled to achieve commercial traction.

Founded

2019

HQ

India

Founders

Varun Jami & Tarun Jami

Comparative Overview

Startups	Category	Core strategy	Key impact	Primary growth market	Revenue model
CarbiCrete	Material	Cement-free, CO₂-cured concrete	Eliminates cement; stores CO₂ permanently	North America, Europe	Tech licensing + carbon credits
Betolar	Material	AI-optimised waste-based binders	80% lower carbon vs. cement	India, Canada, Australia	Platform licensing (SaaS)
Carbon Limit	Material	Carbon-absorbing concrete additive	Structures become carbon sinks	Global infrastructure markets	Additive sales + carbon credits
Concular	Lifecycle	Digital material passports + marketplace	Near-zero demolition waste	European real estate + construction	SaaS + marketplacecommissions
GreenJams	Bio-circular	Agro-waste building blocks	Prevents crop burning; carbon-negative	South Asian infrastructure	Material manufacturing + supply

The Bigger Picture

Across these five distinct technologies, a single pattern emerges: the most promising green construction startups are not just reducing waste — they are turning it into a business model. Carbon credits, AI-enabled licensing, and circular marketplaces are the new engines of the built environment.

The future of construction is no longer just about building taller or faster. It is about building smarter and more circularly. By transforming structures from carbon emitters into carbon sinks, and from waste-producers into material banks, these five startups are proving that the circular green economy is the only viable blueprint for our urban future.

Key Takeaways

1. Rethinking the material: CarbiCrete, Betolar, and Carbon Limit are decarbonising concrete at the production and performance level — each via a distinct, commercially proven mechanism.

2. Extending the lifecycle: Concular's platform treats existing buildings as material banks, creating value from demolition rather than waste — with regulatory tailwinds accelerating adoption.

3. Closing the bio-loop: GreenJams integrates agricultural waste directly into the construction supply chain — addressing rural pollution and urban emissions in a single product.

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Sources: IEA Global Status Report for Buildings and Construction (2023) · Chatham House, "Making Concrete Change" (2018) · Ellen MacArthur Foundation, Circular Economy in Construction · UNEP · Global Carbon Project, Carbicrete, Betolar, Carbonlimit, Concular, Greenjams