Klett Engineer

What Klett Engineer does

Klett Ingenieur GmbH is a German engineering services firm specializing in the planning of technical building equipment (Technische Gebäudeausrüstung, TGA) — sanitary, heating, ventilation, refrigeration, electrical (high- and low-voltage), conveyor, fire suppression, media supply, and building automation systems. Founded in 1982 and headquartered in Stuttgart, the company serves building construction projects across healthcare, education and research, industrial and pharmaceutical, commercial/administrative, and leisure/sports segments, with five offices across Germany (Stuttgart, Meißen, Köln, Hamburg, Würselen) and 132 employees.

The firm operates as a vendor-independent planning consultancy, combining classical TGA planning with complementary services including building simulation, sustainable building design, integrated planning, technical controlling, building management systems, and an online interface management platform. Its most distinctive technology asset is European Patent EP 1 194 723 B1, covering a closed-loop geothermal heat and power extraction process developed for the Energiestiftung Baden-Württemberg in 2000 and granted in 2002. The company emphasizes its independence from equipment manufacturers and its Swabian engineering heritage, and reports 1,909 realized projects and 264 ongoing engagements.

Klett Ingenieur GmbH generates revenue through professional engineering services billed on a project basis, with a sales-led go-to-market targeting enterprise clients via direct relationships and professional referrals. Pricing is not publicly disclosed. Two managing directors — Dipl.-Ing. Jens Klett and Dipl.-Ing. Markus Menges — lead the privately held GmbH, which has no known parent company, external institutional investors, or public listing.

Name

Klett Engineer

Legal name

Klett-Ingenieur-GmbH

Website

https://klett-ingenieur-gmbh.de

Company type

Private

Founded year

1985

Operating status

Operating

Headcount range

51–100 employees

Short description

Klett Ingenieur GmbH is a German engineering consultancy specializing in the planning of technical building equipment (TGA) — HVAC, electrical, sanitary, fire protection, and building automation — for healthcare, education, industrial, commercial, and leisure construction projects, operating from five offices across Germany with 132 employees.

Ownership category

akta.pro rank

Product category

Building Engineering Services

NAICS

Architectural, Engineering, and Related Services (5413)

akta.pro primary industry

HVAC Controls & Optimization (Smart Thermostats, VAV, Chillers/Boilers Controls) (BPABAGAB)

akta.pro secondary industries

Building Thermal Controls & Building Management Systems (HVAC BMS) (IMAHAKAK), HVAC & Refrigeration Contracting (IMAFALAB), Chillers, Boilers & Central Plant Operations (BPABACAG)

Keywords

• Building services engineering
• HVAC planning services
• Technical building equipment
• Geothermal energy systems
• Sustainable building design

Headquarters

HQ city

Fellbach

HQ country

Germany

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Services and Consulting: Professional engineering services for technical building equipment (TGA) including planning, simulation, technical controlling, and integrated project management for building construction projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

Klett Ingenieur GmbH is a German engineering consultancy that plans technical building equipment (TGA — Technische Gebäudeausrüstung) for new construction and renovation projects. Core offerings cover sanitary, heating, ventilation, refrigeration, electrical (high and low voltage), conveyor, fire suppression, media supply and building automation systems, complemented by building simulation, sustainable building design, integrated planning, technical controlling, building management systems, and a proprietary geothermal heat extraction technology.

Product overview

Klett Ingenieur GmbH is a building systems engineering consultancy offering integrated planning services for technical building equipment. The core portfolio centers on the Technische Gebäudeausrüstung umbrella service, supported by specialized sub-services covering sanitary, heating, ventilation, refrigeration, electrical (high and low voltage), conveyor, fire suppression, media supply, and building automation systems. Complementary services include Simulation, Sustainable Building (Nachhaltiges Bauen), Geothermie (with a proprietary patented geothermal heat extraction system), Integrated Planning, Technical Controlling, Building Management Systems, and Online Interface Management. The company serves project types across medical facilities, educational/research institutions, industrial/pharmaceutical buildings, administrative offices, and leisure/sports facilities. With approximately 132 employees and 40 years of experience, the firm operates from headquarters in Stuttgart with additional offices in Meißen, Köln, Hamburg, and Würselen.

Differentiator

Problem solved

Functional benefit

Products and services

• Technical Building Equipment Planning (Technische Gebäudeausrüstung)

Named customers5 records

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

One partnership is on record.

• Energiestiftung Baden-WürttembergcoreStrategic or Co-development Partner · 1 January 2000Commissioned Klett Ingenieur GmbH in 2000 to conduct feasibility study on 'Verfahren zur wirtschaftlichen Gewinnung von Wärme und Strom aus Tiefbohrungen über einen geschlossenen Stoffkreislauf' (Process for economic extraction of heat and power from deep boreholes via closed-loop system). Study led to the company's proprietary geothermy patent.

Scale indicators4 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• AFRY: Nordic-origin engineering and design consultancy active across DACH in building services, energy, and sustainable building design. Comparable on integrated sustainable building planning, with much broader scale and additional industrial/energy exposure.
• Arcadis: Global design and engineering consultancy with significant DACH MEP/sustainability and buildings practices serving healthcare, higher-ed, industrial, and commercial sectors. Broader portfolio and global scale than Klett but directly competes for large building-services planning mandates.
• Ramboll: Danish-headquartered engineering consultancy with a substantial DACH buildings practice covering MEP design, energy and sustainable building advisory — directly comparable service mix to Klett's TGA, simulation and sustainability offerings.
• AECOM: Global infrastructure consulting firm with European building engineering and MEP design capabilities, pursuing large public and healthcare building programs. Adjacent to Klett's market but with substantially broader services, geographic reach, and project scale.
• Sweco: European engineering, design and consulting firm with German and broader DACH presence in building services and sustainable MEP design. Same buyer set as Klett (developers, healthcare, public sector) but at much larger scale and broader geographic footprint.
• Stantec: Global engineering and architecture firm with established European building services and sustainable-design practices serving healthcare, education, and commercial clients. Operates at much larger scale but competes for the same TGA and sustainability planning scopes as Klett.
• HDR Inc. US-headquartered engineering and architecture firm with strong healthcare and research building practices and growing European activity. Directly comparable in healthcare and research MEP design services that Klett serves, though at much larger scale and global footprint.
• WSP: Global engineering professional services firm with a strong German MEP, sustainability, and building services design practice. Competes with Klett for mid-to-large building engineering planning mandates across healthcare, life sciences, and higher education.

Direct peers

• Drees & Sommer: Stuttgart-headquartered German engineering and consulting firm focused on building services, MEP/TGA planning, sustainability, and project management — serving the same healthcare, pharma, education and commercial end markets as Klett across DACH and internationally. Closest direct comparable by geography, service mix, and client profile.
• ATP architects engineers: Austrian-German integrated design firm combining architecture with MEP/TGA engineering planning for office, healthcare, industrial and research buildings — comparable to Klett on integrated planning methodology, BIM-driven workflows, and DACH-focused building services consulting.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks7 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/profile.php
• LinkedInlinkedin.com/company/klett-ingenieur-gmbh

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Klett Engineer