What architectesassoc+ does

architectesassoc+ is a Brussels-headquartered architecture studio founded in 2000 by Sabine Leribaux and Marc Lacour, operating as architectesassoc srl (private limited company) with 11-50 employees. The firm delivers full-service architectural design across new construction, heavy refurbishment, and urban planning, with a distinct specialization in sustainable, low-energy, passive, NZEB, and circular construction. Core technical capabilities include passive building design (Aeropolis II was the largest passive office in the Benelux in 2006), NZEB design (ELIA Green Building was the largest NZEB office in the Benelux in 2010), prefabricated timber façade systems (Kerto panels, timber-glass canopies, modular cladding), BREEAM-certified project delivery with post-occupancy evaluation, Shou Sugi Ban charred bamboo/wood façades, and the ELIA Reversible Framework (ERF), a standardized circular construction system built on TOTEM and NIBE life-cycle assessment tools.

The firm's revenue is generated entirely from professional service fees for architectural design, project management, and construction oversight, delivered through direct commissions from real estate developers (Befimmo, AG Real Estate, Atenor, Extensa, Matexi, IKO Real Estate, Besix Red), corporate clients (Elia Asset, AXA Belgium, Cayman/Marriott), and public authorities (citydev.brussels, Province de Namur, SLRB). Distribution is regional (Belgium across Brussels, Wallonia, and Flanders, plus Luxembourg) and project-based, with no subscription, licensing, or product revenue. The studio positions itself as a collective-author practice, currently led by associates Sophie Vantieghem, Sébastien Zigrand, and Mattias D'Hooghe following the 2024 leadership transition from the founding partners. Customer segments are horizontal (Real Estate Developers, Public Sector, Corporate/Enterprise, and Housing Developers), with a portfolio of 50+ named projects spanning residential, office, retail, cultural, hotel, and public/institutional uses.

Name

architectesassoc+

Legal name

architectesassoc srl

Website

https://architectesassoc.be

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

11–50 employees

Short description

architectesassoc+ is a Brussels-based architecture studio founded in 2000 that designs sustainable, passive, NZEB, and circular buildings for real estate developers, corporate clients, and public authorities across Belgium and Luxembourg.

Ownership category

akta.pro rank

Product category

Architectural Services

NAICS

Architectural Services (54131), Interior Design Services (54141)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industry

Interior Design Services (BPAHAKAB)

Keywords

• Sustainable architecture design
• Passive building design
• Building refurbishment services
• Urban planning services
• Energy efficient construction

Headquarters

HQ city

Brussels

HQ country

Belgium

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Distribution channels3 records

Marketing channels5 records

Core offering

architectesassoc+ is a Brussels-based architecture studio providing full-service architectural design, including new construction, heavy refurbishment, urban planning, and sustainable building consulting. The firm specializes in low-energy and passive construction, with portfolio projects spanning residential, commercial, office, cultural, hospitality, and public/institutional buildings across Belgium and Luxembourg, certified under Passive House, NZEB, and BREEAM standards.

Product overview

architectesassoc+ is a Brussels-based architectural firm offering comprehensive architectural design services, including new construction, heavy refurbishment, urban planning, and sustainable building consulting. The firm specializes in low-energy and passive construction, with notable projects spanning offices, residential, cultural, and mixed-use developments across Belgium and Luxembourg. Their portfolio includes award-winning sustainable buildings certified under BREEAM and Passive House standards.

Differentiator

Problem solved

Functional benefit

Products and services

• Architectural Design Services Full-service architectural design firm offering new construction, heavy refurbishment, urban planning, and sustainable building consulting services across Belgium and Luxembourg, with expertise in passive and low-energy construction, BREEAM-certified sustainability, and circular economy principles. Serves real estate developers, public authorities, and corporate clients.

Quantifiable outcome

• Aeropolis II (2006) was the largest passive office building in the Benelux
• +4 more outcomes

Named customers11 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

15 partnerships are on record, tiered flagship, core and major.

• BefimmoflagshipStrategic or Co-development PartnerBefimmo commissioned architectesassoc+ in 2018 to design the transformation of the Belgian Royal Mint into a multifunctional hub. This flagship project (2017–2025, €30.5M) demonstrates the firm's ability to balance innovative low-carbon design with heritage preservation, achieving low-carbon standards typically met only on new-build projects. The project includes offices, co-living, and horeca on Boulevard Pacheco in Brussels.
• WOW EngineeringcoreStrategic or Co-development PartnerWOW engineering collaborated with architecteassoc+ on the Royal Mint project, providing structural engineering services for the high-ceilinged timber atrium carved out of the existing structure. Also structural engineering partner on the Elia Green Building project.
• ArcadiscoreStrategic or Co-development PartnerArcadis provided services engineering on the Royal Mint project. Also engineering partner on Orban (European Commission standards upgrade, 28,000 sqm), bringing expertise in compliance with stringent Commission building specifications.
• Louis De WaelecoreImplementation/ SI/ Consulting PartnerLouis De Waele served as contractor on the Royal Mint refurbishment project, executing the transformation of the brutalist heritage building. Also contractor on the National Theatre project and Maison Administrative de la Province de Namur.
• DDS+coreStrategic or Co-development PartnerDDS+ leads the residential component of the Themis urban development (33,000 m² above ground, 14,000 m² below), while architectesassoc+ designs the 19,500 m² of office space. Engineering partners include EOLE, DUSS, and BSolutions.
• AG Real EstateflagshipStrategic or Co-development PartnerAG Real Estate is developing the Themis project along avenues Bourgeois and Cauchy in Brussels, commissioning architectesassoc+ for the office component of this large-scale mixed-use urban development that also includes housing, retail, day-care centre, and extensive landscaping.
• CenergiecoreStrategic or Co-development PartnerCenergie (engineering consultancy) collaborated on multiple projects including Aeropolis II, Tervueren 168, and Greenbizz, providing expertise in energy efficiency and sustainable building techniques for passive and NZEB buildings.
• AxxiocoreImplementation/ SI/ Consulting PartnerAxxio served as Project Manager on the Royal Mint project, while also acting as highly invested Project Manager on the Orban upgrade project (28,000 sqm for the European Commission), coordinating all parties and ensuring compliance with Manual of Standard Building Specifications.
• IKO Real Estate and Thomas & PironflagshipStrategic or Co-development PartnerIKO Real Estate and Thomas & Piron (TP BAU) developed the Unicity project in Luxembourg City — a seven-and-a-half-year project completed with architectsassoc+ that brought together people of great talent and involved ongoing dialogue with the City of Luxembourg. Full team included QBuild, ICB, Betic, Reflect, Energie&Environement, Preventica, D2S, Luxcontrol.
• ExtensaflagshipStrategic or Co-development PartnerExtensa commissioned the RIVA project (139 flats, €24.3M) on Brussels' canal waterfront. The project aims to connect the Quartier Nord with Tour&Taxis developments, creating a public plaza and canal-side housing with significant city-scale impact.
• AtenorflagshipStrategic or Co-development PartnerAtenor (Immobilière de la petite île) commissioned the City Dox project (93 flats, €20M) and City Docks project (118 homes) in Brussels' canal zone. Both are large-scale mixed-use developments where arquitectosassoc+ provides design for housing, workspace, and retail integration.
• citydev.brusselsflagshipStrategic or Co-development Partnercitydev.brussels commissioned the Greenbizz sustainable incubator project — Belgium's first environment-related start-up incubator — as part of the Tivoli eco-district in Brussels' canal zone. citydev actively supported the design team throughout the decade-long development. Also commissioned the Brussels Greenbizz project with FEDER funding.
• Cayman Group / Marriott InternationalmajorStrategic or Co-development PartnerCayman Group (Belgian hotel group operating 12 properties) partnered with Marriott International to commission the conversion of the Navona 300 office building in Diegem into a 137-room Moxy Hotel (€7M, 4,900 m²), with Cayman managing operations and Marriott providing the global brand platform.
• BPC (Bouwbedrijf P.B.C.)coreImplementation/ SI/ Consulting PartnerBPC served as contractor on the HD54 heavy refurbishment project for AXA Belgium, executing the transformation of the 1980s office building with prefabricated timber facades, loggias, and BREEAM-certified upgrades.
• Groep Arco (KWB-KAV-KAJ)coreStrategic or Co-development PartnerGroep Arco consortium commissioned the Aeropolis II project (largest passive office building in Benelux, 2005–2010, €13.5M) on Avenue Britsiers in Schaerbeek. The project pioneered passive office design at scale in Belgium.

Scale indicators3 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• Vincent Callebaut Architectures: Paris-based sustainable/green architecture practice with similarly visionary low-carbon, biophilic, and prefabricated projects. Highly comparable mission and design philosophy to architectesassoc+'s passive/NZEB specialization.
• BINST Architects: Belgian architecture firm with a strong portfolio in residential, office, and urban regeneration projects across Brussels. Comparable scale and Belgian developer client base.
• XDGA (Xaveer De Geyter Architects): Brussels-headquartered architecture practice working on large-scale urban and mixed-use projects in Belgium. Closely comparable regional positioning and project scale.
• HUB architecten: Belgian/Dutch architecture practice with comparable sustainable design focus, working on urban regeneration and mixed-use projects in the Benelux region.
• Samyn and Partners: Long-established Belgian architecture and engineering firm with public-sector and large commercial commissions. Comparable Belgian institutional client base and sustainable-design credentials.

Broad incumbents

• Snøhetta: Global architecture practice specializing in sustainable and culturally significant buildings. Comparable low-energy/passive expertise but at a much larger scale with broader service portfolio.
• MVRDV: Dutch architecture firm with strong sustainability credentials and large mixed-use urban projects across Europe. Comparable typology (sustainability, urban regeneration) but with broader international footprint.
• Studio Gang: US sustainable design practice known for environmental performance-led architecture. Comparable design ethos around sustainability, but anchored in North American markets.
• BIG (Bjarke Ingels Group): Global architecture firm with strong sustainability and innovative-design positioning. Comparable in ambition and sustainability messaging but at much larger scale.
• Foster + Partners: Global architecture firm with deep sustainability practice and large-scale commercial/institutional work. Overlaps with architectesassoc+ on high-performance sustainable design at significantly larger scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key highlights7 records

Customer concentration

• Xtwitter.com/architectesassoc
• LinkedInlinkedin.com/company/architectesassoc
• Facebookfacebook.com/architectesassoc.be

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 architectesassoc+