Istema
- Company typePrivate
- Founded1980
- HeadquartersGent, Belgium
- Headcount11–50
- GTM typeB2B
- OfferingServices
Istema firmographics
Firmographics- Name
- Istema
- Legal name
- ISTEMA nv
- Website
- https://istema.be
- Company type
- Private
- Founded year
- 1980
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Ownership category
- akta.pro rank
Istema industry classification
Industry- Product category
- Building Engineering and Energy Consulting Services
- NAICS
- Engineering Services (54133)
- SIC
- Services-Engineering Services (8711)
- akta.pro primary industry
- Energy Services (Retrofits/Commissioning/Testing & Balancing) (IMAIABAI)
- akta.pro secondary industries
- Performance Contracting & Energy-as-a-Service (EaaS) for Buildings (BPABAGAN), Asset Management & Owner’s Engineering (Lifecycle Strategy, Budgeting, Technical Due Diligence) (EUAMAGAJ)
Keywords
Where Istema is headquartered
LocationHeadquarters
- HQ city
- Gent
- HQ country
- Belgium
- HQ region
- Europe
Offices2 records
Markets served
Istema business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales, Others
Revenue model
- Technical Studies & Engineering: Full technical studies for building installations (HVAC, ventilation, heating, cooling, electricity, weak current) from concept through construction follow-up. Services include concept design, detailed design, specifications, bills of quantities, and site supervision.
- Building Physics & Energy Concepts: Building energy performance certification (EPB/PEB), E and K level calculations, passive building verification, building envelope and sunlight advice, and dynamic overheating simulations.
- Commissioning & Optimization: Independent validation of building installations post-construction through measurements, verifications, and control parameter reviews. Includes regular seasonal commissioning during the first year and ongoing monitoring for energy optimization.
- Feasibility Studies: Feasibility studies for renewable energy techniques (heat pumps, solar energy, geothermal, cogeneration) evaluating technical and economic viability. Life cycle cost analyses and energy master plans for multi-building sites.
Go-to-market motion2 records
Distribution channels2 records
Marketing channels3 records
Istema product offering
Product offeringCore offering
Istema is a Belgian engineering and consulting firm that designs sustainable technical building installations (HVAC, ventilation, heating, cooling, electricity, weak current) and delivers energy performance consulting, building physics advice, independent commissioning, and feasibility studies for renewable energy investments. The firm serves Belgian construction clients, building owners, and architects through direct engagement, using BIM-based design (REVIT MEP), dynamic simulations, EPB/PHPP calculations, and life cycle cost analysis. Its wholly-owned subsidiary FTI extends the same service portfolio to the Brussels and Walloon markets.
Product overview
Istema is an engineering and consultancy bureau specialized in sustainable building techniques and energy optimization for buildings. The company operates as a unified service offering organized into four interconnected core service lines: Technical Studies (designing HVAC, ventilation, heating, cooling, electrical systems), Building Physics Advice/Energy Concepts (energy performance certification, building envelope consulting, dynamic simulations), Commissioning & Optimization (independent validation and ongoing optimization of technical installations), and Feasibility Studies (assessing renewable energy investments and life cycle costs). These services span various building sectors including industry, offices, laboratories, retail, schools, and care homes, and are delivered through a BIM-based approach using Revit MEP software for 3D modeling. The company also partners with Flow Transfer International (FTI) for the Brussels and Walloon markets.
Differentiator
Problem solved
Functional benefit
Products and services
- Technical Studies (Technische Studies)
- Building Physics Advice / Energy Concepts (Bouwfysisch Advies / Energetische Concepten)
- Commissioning & Optimization (Commissioning & Optimalisatie)
- Feasibility Studies (Haalbaarheidsstudies)
Quantifiable outcome
- Buildings designed to passive standards (primary energy < 45 kWh/m²/year) with E-levels as low as E25-E35
- +3 more outcomes
Companies that use Istema
Customer profileNamed customers17 records
Segments3 records
Ideal customer profiles3 records
Istema technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature5 records
Istema partnerships and signals
Strategic signalPartnerships
Three partnerships are on record, tiered core and minor.
- Flow Transfer International (FTI)coreFTI has been a partner and subsidiary of Istema since 2007, serving the Brussels and Walloon markets. Under the leadership of ir. Architect Andrew Janssens, FTI operates as a mid-sized engineering office with approximately 10 engineers. FTI shares the same sustainability philosophy and values as Istema, and its project references are integrated under Istema's reference pages. FTI studies HVAC, electricity, sanitation, fire protection, elevators, and smoke extraction installations for medium and large buildings, and also handles PEB certification for the Brussels region.
- ORI (Organisation Professionnelle des Bureaux d'Ingénierie et de Consultance en Belgique)minorFTI is a member of ORI, the professional organization of engineering and consulting offices in Belgium.
- ATIC (Association Royale Technique Belge de l'Industrie du Chauffage, de la Ventilation et des Branches)minorFTI is a member of ATIC, the Royal Belgian Technical Association for Heating, Ventilation and related industries.
Scale indicators4 records
Recent moves7 records
Expansion highlights5 records
Istema competitors and assessment
Company assessmentBroad incumbents
- Arcadis: Global design and engineering consultancy with Belgian offices providing building-services engineering, sustainability advisory, and energy consulting. Comparable in service overlap but operates at multinational scale with broader portfolio including infrastructure, water, and environment.
- Sweco: European engineering consultancy with Belgian operations covering sustainable building design, MEP, energy, and building physics. Direct overlap on Belgian commercial, institutional, and industrial projects, though Sweco's overall scale and geographic breadth far exceed Istema's.
- WSP: Global professional-services firm with a Belgian presence providing MEP engineering, building physics, sustainability, and commissioning services to public and private clients. Competes with Istema on Belgian institutional and enterprise projects but operates at much larger scale and across multiple disciplines.
- Arup: Global engineering consultancy with MEP, building physics, sustainability, and commissioning services; competes on large Belgian and European institutional projects. Broader scope (structures, infrastructure, façade) than Istema but directly comparable on building-services work.
- Buro Happold: International engineering consultancy with MEP, building performance, sustainability, and commissioning practices. Overlaps with Istema on building-services consulting for institutional and enterprise clients, particularly on complex and high-performance buildings.
- Royal HaskoningDHV: Dutch-headquartered international engineering consultancy with Belgian activity, providing building-services, energy, and sustainability consulting. Similar service profile but operates from a much larger multidisciplinary platform spanning infrastructure, water, and industry.
- Tractebel (Engie): Belgian-headquartered global engineering giant (part of Engie) with extensive building-services, energy, and sustainability capabilities. Overlaps with Istema on MEP, energy consulting, and sustainable-buildings work but operates at vastly larger scale and across many non-building segments.
Direct peers
- VK Architects & Engineers: Belgian multidisciplinary engineering and architecture firm with a strong MEP and sustainable-buildings practice covering HVAC, building physics, EPB certification, and energy consulting. Comparable in size, Belgian geographic focus, and service offering to Istema.
- Boydens engineering: Belgian engineering consultancy specializing in sustainable building techniques, MEP design, building physics, and energy performance — almost identical scope and customer profile to Istema, serving Belgian developers, architects, and institutional clients. The closest like-for-like competitor in the Belgian market.
- Ingenium: Belgian engineering consultancy providing technical building services (HVAC, electricity, sanitation), EPB certification, and sustainable-design consulting across Flanders and Brussels. Closely comparable in size, service offering, and Belgian market focus to Istema.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks1 record
Key highlights7 records
Customer concentration
Istema social profiles
Digital presenceIstema financial estimates
Financial estimateRevenue estimate
Valuation estimate
Istema leadership team
Management profileNumber of profiles
Profiles1 record
Istema subsidiaries and ownership
Company hierarchySubsidiaries1 record
Istema funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Istema M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Istema
What does Istema do?
Istema is a Belgian engineering and consulting firm that designs sustainable technical building installations (HVAC, ventilation, heating, cooling, electricity, weak current) and delivers energy performance consulting, building physics advice, independent commissioning, and feasibility studies for renewable energy investments. The firm serves Belgian construction clients, building owners, and architects through direct engagement, using BIM-based design (REVIT MEP), dynamic simulations, EPB/PHPP calculations, and life cycle cost analysis. Its wholly-owned subsidiary FTI extends the same service portfolio to the Brussels and Walloon markets.
Is Istema a public or private company?
Istema is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Istema founded?
Istema was founded in 1980. It employs 11 to 50 people.
Where is Istema based?
Istema is headquartered in Gent, Belgium, in the Europe region.
How does Istema make money?
Four revenue lines are on record. Technical Studies & Engineering is the primary driver. The others are building Physics & Energy Concepts, commissioning & Optimization and feasibility Studies.
Who are Istema's main competitors?
Broad incumbents on record are Arcadis, Sweco, WSP, Arup, Buro Happold, Royal HaskoningDHV and Tractebel (Engie). Direct peers are VK Architects & Engineers, Boydens engineering and Ingenium.
Does Istema have an API?
No public API is recorded for Istema.
What industry is Istema in?
Istema's product category is Building Engineering and Energy Consulting Services. Its primary akta.pro industry code is IMAIABAI, Energy Services (Retrofits/Commissioning/Testing & Balancing), with a secondary code of BPABAGAN, Performance Contracting & Energy-as-a-Service (EaaS) for Buildings. Its NAICS code is 54133 and its SIC code is 8711.