De Derde Long - duurzaam woon- en werkcomfort

What De Derde Long - duurzaam woon- en werkcomfort does

De Derde Long ('The Third Lung') is a Flemish B2B knowledge and media platform that frames indoor space as a health, productivity, and safety asset for building occupants. Founded circa 2015 and operated by Claerhout nv Communicatiehuis from its headquarters on the CommunicatieCampus in Ghent, Belgium, the platform targets building owners, architects, engineering firms, contractors, and developers across the construction sector. It operates alongside five sibling platforms (De Zevende Gevel, De Bouwschil, De Vijfde Gevel, Brain Buildings, Digitaal Bouwteam) within the broader B2Build Mediaplatform ecosystem.

The platform's core deliverables are content and community rather than software: a curated library of case studies, expert blog articles, themed inspiration workshops and symposia, and the free B2Build Academy membership programme that grants access to 14 annual themed events and a network of 60 manufacturer experts. No proprietary technology products, APIs, or software platforms are developed; distribution runs through the company website, LinkedIn, Vimeo showcase recordings, email/newsletter, and live events at CommunicatieCampus Gent and partner venues. Partners co-produce reference-project case studies, hybrid events, and co-branded content.

Revenue mechanics rest on three streams: (1) recurring corporate partnership and sponsorship fees from approximately 12 building partners (including Knauf, Tarkett, GROHE, Ahrend, Multiline, Interalu LCC, Delabie, Niko, Wilms, Any Green, Chubb Somati, Vitra) and corporate partners (ING, Steligence/ArcelorMittal); (2) a freemium B2Build Academy membership model where member access is free and monetisation flows through the partner ecosystem; and (3) event revenue from paid workshops and registration-based inspiration sessions. Pricing is not publicly disclosed; sales are contact-based for corporate partnerships. The operating geography is Flanders/Belgium, with no disclosed revenue or headcount figures.

Name

De Derde Long - duurzaam woon- en werkcomfort

Legal name

Claerhout nv Communicatiehuis

Website

https://dederdelong.be

Company type

Private

Founded year

2015

Operating status

Operating

Headcount range

1–10 employees

Short description

De Derde Long is a Flemish B2B knowledge and media platform under Claerhout nv Communicatiehuis that convenes architects, engineers, contractors, and building owners through case studies, themed events, and the free B2Build Academy to promote sustainable indoor comfort, healthy indoor climates, and circular building practices in Belgium.

Ownership category

akta.pro rank

Product category

Construction Industry Media & Events

NAICS

Facilities Support Services (561210)

SIC

Services-To Dwellings & Other Buildings (7340)

akta.pro primary industry

Sustainable/Green Building & LEED Consulting (BPAHAKAG)

akta.pro secondary industry

Building Automation & Controls (BAS/BMS) (HSAPAPAA)

Keywords

• Sustainable building media
• Indoor climate knowledge
• Construction industry events
• B2B content platform
• Building professional networking

Headquarters

HQ city

Gent

HQ country

Belgium

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D

Revenue model

1. Corporate Partnership & Sponsorship: Building partners, knowledge partners, and corporate partners (such as ING, Steligence/ArcelorMittal, Claerhout Communicatiehuis) pay to be featured on the platform, participate in co-branded events, and access lead-generation opportunities through the B2Build network. Partners develop joint content around reference projects, hybrid events, and online marketing.
2. B2Build Academy Membership: Free membership to B2Build Academy grants access to knowledge resources, a professional builder network, 14 themed events, and direct contact with 60 manufacturer experts. The programme is described as free to join, suggesting the platform monetises through partner subscriptions rather than direct member fees.
3. Event Revenue: Inspiration events and workshops serve as a revenue channel, with some events free (e.g., 'RESIDU-EREN') and others requiring registration. Events feature partner presentations and case studies.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels8 records

Core offering

De Derde Long operates a Belgian B2B knowledge and media platform for sustainable living and working comfort, focusing on healthy indoor climate, safety, and well-being in buildings. It delivers this through the B2Build ecosystem, combining an online knowledge academy (cases, blogs, expert articles), partner-based corporate sponsorships, and an annual B2Build networking event for construction professionals. The platform connects architects, installers, builders, building owners, and corporate partners around sustainable building practices.

Product overview

De Derde Long is a B2Build Mediaplatform operated by Claerhout nv Communicatiehuis that serves as a communication and knowledge platform focused on sustainable living and working comfort, healthy indoor climate, safety, and well-being in buildings. The platform connects construction professionals including developers, architects, engineering firms, contractors, and building owners through a network of product partners, knowledge partners, and corporate partners. Its core offerings include B2Build Academy (knowledge sharing and networking), Workshops & Inspiratiesessies (educational events), Cases (project examples), Blogs (expert content), and a Partner Network. The platform publishes content in Dutch and focuses on topics including indoor climate, lighting, acoustics, sustainable materials, water management, and fire safety.

Differentiator

Problem solved

Functional benefit

Brands

• B2Build Academy: A knowledge platform for construction professionals offering access to knowledge, network of building professionals, 14 themed events, and access to 60 manufacturer experts.

Products and services

• B2Build Academy Online knowledge hub offering cases, blogs, and expert articles on sustainable living and working comfort, healthy indoor climate, and building safety for construction professionals and corporate partners.
• B2Build Event Annual in-person networking event that brings together construction professionals, architects, installers, builders, building owners, and corporate partners around sustainable building themes.
• Partner Network Corporate sponsorship and partnership program that gives brands visibility and thought-leadership positioning within the B2Build ecosystem and its audience of construction professionals.

Quantifiable outcome

• A green work environment is shown to increase well-being by 47%, boost creativity by 45%, and improve productivity by 38% (University of Exeter research cited by Any Green partner)
• +4 more outcomes

Named customers12 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration5 records

Partnerships

19 partnerships are on record, tiered core and minor.

• KnaufcoreGTM or Marketing PartnerBuilding materials partner specialising in plaster, plasterboard, and finishing solutions. Contributes to De Derde Long case studies on acoustic comfort and sustainable building materials, including projects such as De Zande in Beernem and the Egied Van Broeckhovenschool.
• MultilinecoreGTM or Marketing PartnerLighting solutions partner developing and producing LED lighting fixtures since 1982. Provides expert contributions on daylight optimisation, relighting projects, and visual comfort, including the Donaldson Europe Leuven case study delivering 50% energy savings.
• TarkettcoreGTM or Marketing PartnerFlooring partner with 135 years of history, providing carpet tiles and floor solutions. Contributes case studies on biophilic design, acoustic comfort, and flexible workspace zoning through carpet patterns, including SAP Belgium Diegem and Virtuology projects.
• Interalu LCC PlafondscoreGTM or Marketing PartnerClimate ceiling specialist providing solutions for temperature, humidity, acoustics, and ventilation. Contributes case studies on aesthetic, thermal, and acoustic comfort in WELL-certified buildings, including Park 7 Diegem and La Grand Poste Liège heritage conversion.
• DelabiecoreGTM or Marketing PartnerSanitary equipment partner and European market leader in public sanitary solutions. Provides vandal-resistant, water-saving fixtures for projects such as Jeugdhuis De Kaller in Zutendaal, with expertise in hygiene, design, and water efficiency.
• NikocoreGTM or Marketing PartnerElectrical solutions partner developing smart building systems that enhance living and working environments. Contributes expertise on building automation, lighting control, and user-intuitive comfort solutions for sustainable buildings.
• WilmscoreGTM or Marketing PartnerSun protection and shading partner producing roller shutters and solar shading systems. Contributes case studies on solar control, energy-efficient office design, and thermal comfort, including Ockier Advocaten & Partners project.
• Any GreencoreGTM or Marketing PartnerGreen workplace specialist creating biophilic environments with living plants that contribute to well-being, focus, and productivity. Contributes expertise on green walls, moss logos, interior gardens, and air purification, citing University of Exeter research on 38-47% improvements in well-being and productivity.
• AhrendcoreGTM or Marketing PartnerOffice furniture partner with 125 years of heritage, offering complete interior solutions. Pioneers circular economy with a 12,000 m² Circular Hub that refurbishes used office furniture, achieving up to 90% CO2 reduction compared to new furniture, and promoting sustainability, design, and innovation.
• Chubb Somati SystemscoreGTM or Marketing PartnerFire safety and security partner providing custom fire detection, sprinkler, and extinguishing gas systems, as well as intrusion and camera surveillance. Contributes case studies on fire-protected 'third lung' environments, including data centre and Gamma Roeselare projects.
• GROHEcoreGTM or Marketing PartnerSanitary and water management partner offering SmartControl shower systems, GROHE Blue drinkwater systems, and Atrio fixtures. Contributes case studies on plastic-free lounges, water-saving hotels (Van der Valk Mechelen), WELL-certified buildings (Deloitte HQ), and cradle-to-cradle Gold certified products at Gare Maritime.
• VitracoreGTM or Marketing PartnerOffice furniture partner contributing to workplace interior projects with design-forward, ergonomic solutions. Featured in Deloitte HQ Gateway case study, providing flexible workstation typologies and customisation aligned with corporate identity.
• LGminorGTM or Marketing PartnerElectronics and display partner contributing to De Derde Long's ecosystem of building solution providers.
• Steligence (ArcelorMittal)coreGTM or Marketing PartnerArcelorMittal Steligence® is a corporate partner providing science-based steel construction philosophy. Promotes holistic building approaches that maximise steel use, enable circular economy (100% recyclable), and deliver peer-reviewed sustainability outcomes. XCarb® recycled and renewable steel products reduce carbon footprint of construction projects.
• Claerhout nv CommunicatiehuiscoreStrategic or Co-development PartnerThe parent communication agency and production house of De Derde Long. Provides full-service communication (strategy, concept, online, offline, photography, video, signage, events) from the CommunicatieCampus in Ghent. Founded by Pieter Claerhout, it is the initiator of the B2Build mediaplatform concept spanning six thematic construction platforms.
• SwecocoreTechnology or IntegrationMultidisciplinary architecture and engineering knowledge partner. Provides expertise in sustainability certifications (BREEAM, WELL, GRO, DGNB), biofilic design, and healthy indoor environments. Contributes expert presentations on the first WELL Gold certified building in Belgium (Onyx) and the economics of well-being in the built environment.
• AiNB (Association of Interior Architects Belgium)minorStrategic or Co-development PartnerKnowledge partner representing and promoting the interior architecture profession in Belgium. Chairman Mauro Brigham also founded ncbham architecture practice and Materiatek, Benelux's most comprehensive independent materials library.
• Ventilair GroupcoreGTM or Marketing PartnerHVAC and ventilation partner providing Komfovent RHP units with heat recovery and integrated heat pump for healthy indoor air quality (targeting <900 ppm CO2). Featured in Titeca Pro Accountants case study demonstrating energy-efficient climate control through dynamic building simulations.
• Lumac SignsminorGTM or Marketing PartnerSignage and wayfinding partner integrating communication into physical environments. Contributes case studies on stress-reducing wayfinding with rounded forms at UZ Leuven and biophilic communication design in healthcare settings.

Scale indicators5 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• U.S. Green Building Council (USGBC): Operator of the LEED certification system for sustainable buildings in North America. Comparable as a knowledge and standards organization in the sustainable building space with similar mission of advancing healthy, efficient buildings, though a US-focused standards body rather than a media platform.
• ArchDaily: Global architecture media platform with extensive case study content and product directories. Comparable in B2B architecture media model and case-study-driven audience engagement, though at significantly larger global scale and broader architectural scope than De Derde Long's building comfort focus.
• Detail Magazine: International architecture publication focused on building construction details and sustainable design. Comparable in serving architects and building professionals with detailed technical content on construction methods, materials, and sustainability.

Regional players

• DGNB (Deutsche Gesellschaft für Nachhaltiges Bauen): German Sustainable Building Council operating a competing certification system to LEED/BREEAM. Comparable as a knowledge and certification body for sustainable buildings in the DACH region, though primarily a certification/standards organization.
• Buildwise: Belgian collective research centre for the construction industry (formerly WTCB/CSTC). Comparable as a Belgian construction knowledge organization with research, technical guidance, and training, though primarily research-driven rather than media-driven. Listed as a knowledge partner of De Derde Long.
• IGBC (Indian Green Building Council): Indian Green Building Council promoting green building practices and knowledge in India. Comparable as a knowledge and standards organization driving sustainable building awareness, though operating in a different geography with a different certification framework.

Direct peers

• Bouwkennis: Dutch market research and knowledge platform for the construction and installation sector. Comparable in providing aggregated market intelligence, research reports, and industry events to construction professionals in the Benelux region, with similar partnership-driven revenue model.
• Cobouw: Netherlands' leading construction industry news and analysis platform. Comparable in serving construction professionals with project news, expert commentary, and industry events, though broader in geographic and topical scope than De Derde Long's sustainable building focus.
• Architectenweb: Leading Dutch architecture and building media platform serving architects, developers, and construction professionals across the Benelux. Comparable through B2B knowledge sharing, case studies, and event-based community engagement, though broader in scope than De Derde Long's indoor comfort and WELL/BREEAM focus.
• Duurzaam Gebouwd: Dutch B2B media and knowledge platform covering sustainable building practices, energy efficiency, and healthy indoor environments. Directly comparable to De Derde Long in audience (construction professionals), content focus (sustainable building knowledge), Dutch-language market, and monetization model (corporate partnerships and sponsorship).

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• YouTubevimeo.com/showcase/6826741
• LinkedInlinkedin.com/company/de-derde-long

Compliance2 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about De Derde Long - duurzaam woon- en werkcomfort