Institute for Social and Environmental Research Kleinmann GmbH

What Institute for Social and Environmental Research Kleinmann GmbH does

ISUF GmbH (Institut für Sozial- und Umweltforschung GmbH) is a privately held German professional services firm headquartered at Forsthausstraße 16 in Weiskirchen, Saarland, operating three integrated specialist departments: (1) Kommunales Energie-Management KEM, providing municipal energy management services since 1989 including consumption reporting, property inspections, benchmarking, and advisory for emissions and cost reduction in public facilities; (2) TGA Planung SHT INGENIEURE, offering technical building equipment planning since 1986 across all HOAI performance phases for heating, ventilation, air conditioning, sanitary, and specialized systems; and (3) Energetische Berater- und Auditoren-Leistungen EBAL, launched in February 2021 to provide energy consulting, DGNB certification, DIN 16247 energy audits, and komm.EMS coaching. The firm employs 19 specialists with credentials spanning DGNB auditing, DIN V 18599 energy efficiency expertise, and certified kom.EMS auditing.

The firm's primary customer base is municipal governments and public-sector institutions in Saarland and southwestern Germany, with secondary exposure to commercial and private building projects seeking TGA planning or sustainability certification. Revenue is generated through project-based professional services engagements — consulting retainers, planning mandates, audits, and training — with no disclosed pricing model, no software or SaaS revenue, no public financial filings, and no institutional or external investors. The firm describes itself as a market leader for municipal energy management in the southwestern German region and operates under the regulatory oversight of the Ingenieurkammer des Saarlandes.

On 01.02.2021, the company transitioned ownership and management from founder Dr. Kleinmann to Frederik Schulien and Sebastian Adam after 32 years of continuous leadership, followed by an internal restructuring into the three current divisions and a 2025 consolidation of both prior office locations into the single Weiskirchen headquarters. There are no funding rounds, M&A activity, parent companies, or public-market listings associated with the firm.

Name

Institute for Social and Environmental Research Kleinmann GmbH

Legal name

Institut für Sozial- und Umweltforschung GmbH

Website

https://isuf.de

Company type

Private

Founded year

1986

Operating status

Operating

Headcount range

11–50 employees

Short description

ISUF GmbH is a privately held German professional services firm in Weiskirchen, Saarland, operating three integrated departments — municipal energy management (KEM), technical building equipment planning (SHT INGENIEURE), and energy consulting and auditing (EBAL) — serving municipalities, public institutions, and commercial clients in southwestern Germany.

Ownership category

akta.pro rank

Product category

Engineering and Energy Management Consulting

NAICS

Architectural, Engineering, and Related Services (5413), Environmental Consulting Services (54162), Management, Scientific, and Technical Consulting Services (5416)

SIC

Services-Engineering Services (8711), Services-Management Consulting Services (8742)

akta.pro industry

PRIMARYIMAFALAB

HVAC & Refrigeration Contracting

Industrials, Manufacturing & Construction/Construction & Civil Engineering/Specialty Trade Contractors (MEP, HVAC, Plumbing, Electrical)

SECONDARYBPAHAJAF

EHS Management Systems & ISO Consulting (ISO 14001/45001)

Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Environmental, Health & Safety (EHS) Consulting

SECONDARYBPAHAJAI

Air Quality & Emissions Management

Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Environmental, Health & Safety (EHS) Consulting

SECONDARYEUAHAIAC

EMS Integration (ISO 9001/45001/50001) & Integrated Management Systems

Energy, Utilities & Environment/Environmental Compliance, Monitoring & Consulting/Environmental Management Systems (EMS) & ISO 14001 Consulting

Keywords

• Municipal energy management
• Technical building planning
• Energy consulting services
• Energy efficiency auditing
• TGA engineering services

Headquarters

HQ city

Weiskirchen

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Services - Energy Management: Project-based consulting and advisory services for municipal energy management, including regular property inspections, practical training, and continuous consulting for optimizing energy consumption and reducing emissions.
2. TGA Planning Services: Comprehensive technical building equipment planning services covering all HOAI performance phases (1-9), from basic determination to object supervision, for building services trades including heating, ventilation, air conditioning, sanitary systems, and specialized installations.
3. Energy Advisory and Auditing Services: Specialized consulting, qualification, and audit services for energy efficiency and sustainability, including coaching for komm.EMS certification, training programs, DGNB consulting, and DIN 16247 energy audits.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

ISUF GmbH delivers project-based consulting and planning services across three integrated divisions: municipal energy management (regular property inspections, consumption reporting, energy data management and advisory), technical building equipment planning across all HOAI performance phases for heating, ventilation, air conditioning, sanitary and specialized systems, and energy consulting/auditing including DGNB consulting, kom.EMS coaching, and DIN 16247 audits. The firm combines these three specialist departments to provide holistic, interdisciplinary solutions to municipalities, public institutions, commercial firms, and private building owners.

Product overview

ISUF GmbH is a research and consulting firm offering three integrated service divisions for sustainable energy and technical solutions. The core offerings include Kommunales Energie-Management KEM (municipal energy management since 1989), TGA Planung SHT INGENIEURE (technical building equipment planning since 1986), and Energetische Berater- und Auditoren-Leistungen EBAL (energy consulting and auditing). These three divisions work interdisciplinarily, enabling holistic project management from energy optimization through technical building planning to certification and training services.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Energy, emission, and cost reduction through optimization of existing technical facilities

Named customers2 records

Segments3 records

Ideal customer profiles3 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration1 record

Partnerships

One partnership is on record.

• Ingenieurkammer des Saarlandes (Engineering Chamber of Saarland)minorOthersRegulatory oversight body. The company operates under the supervision of the Ingenieurkammer des Saarlandes, Franz-Josef-Röder-Str. 9, 66119 Saarbrücken, as required for engineering service providers in Germany.

Scale indicators2 records

Recent moves6 records

Expansion highlights4 records

Broad incumbents

• TÜV SÜD AG: Global testing, inspection and certification group with a large German energy and buildings practice that performs energy audits (DIN 16247), ISO/energy management system certification, and sustainability advisory. Competes with ISUF's EBAL auditing and DIN-based certification services but as part of a much broader portfolio across many industries.
• Fraunhofer-Institut für Bauphysik IBP: German applied research institute conducting building physics, energy efficiency, HVAC and indoor climate research with associated consulting for public-sector and industry clients. Peer because it shapes methodologies and DIN/ISO standards (DIN 16247, energy efficiency) that ISUF's EBAL and TGA practices implement for municipal customers.
• Drees & Sommer SE: Major German engineering and consulting firm offering building services engineering (TGA-equivalent), energy management, ESG and sustainability advisory across public and private real estate. ISUF overlaps directly with Drees & Sommer in TGA planning, building certification, and municipal/public-sector energy consulting — but Drees & Sommer operates as a much larger generalist.
• Arcadis Germany (Arcadis Deutschland GmbH): Global design, engineering and environmental consultancy with a German building and sustainability practice serving public-sector clients on energy transition and compliance mandates. Comparable to ISUF across energy management, decarbonization roadmaps and certification work, but as a much larger generalist player.
• Ramboll Group (Ramboll Deutschland GmbH): International engineering, consulting and architecture group with substantial German practice covering buildings, energy and sustainability advisory for public-sector clients. Overlaps with ISUF's full stack (TGA energy concepts, certification, municipal consulting) but operates at significantly larger scale and geographic scope.

Regional players

• EnergieAgentur.NRW: Public regional energy agency serving North Rhine-Westphalia municipalities with energy management, energy concepts, and Klimaschutz consulting. Structurally analogous to the Energieagentur-type competitors ISUF faces in its home market and serving the same customer type (German municipalities) but in a different Bundesland, hence a regional comparable.

Direct peers

• Gertec GmbH Ingenieurgesellschaft: German engineering firm focused on energy, building technology and TGA planning for public and commercial clients, including energy concepts and building-services engineering across HOAI phases. Direct peer to ISUF's TGA SHT INGENIEURE and EBAL divisions in the southwestern German market.
• IZES Institut für ZukunftsEnergie und Systemtechnik GmbH: Energy consulting and applied research institute based in Saarbrücken (same federal state as ISUF), focused on renewable energy, energy system analysis, and municipal energy planning. Direct peer because it serves the same southwestern German municipalities with energy management, scenario consulting, and feasibility studies competing against ISUF's KEM and EBAL offerings.
• BET Büro für Energiewirtschaft und technische Planungen GmbH: Specialized German consulting firm providing energy and infrastructure economic analyses, municipal energy and heat planning, and energy management consulting. Closely comparable to ISUF in targeting German municipalities with strategic energy, heat, and consumption advisory — direct overlap with KEM and EBAL services.

Others

• DGNB Deutsche Gesellschaft für Nachhaltiges Bauen: German certification body for sustainable buildings (DGNB system), for which ISUF managing director Sebastian Adam is a certified Auditor. Adjacent ecosystem participant rather than a direct competitor — ISUF performs DGNB consulting and audits, while DGNB owns the standard and trains/registers auditors.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights5 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles14 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 Institute for Social and Environmental Research Kleinmann GmbH