Sustech AG

What Sustech AG does

Sustech AG is an independent Swiss engineering consultancy headquartered in Uster (Canton of Zurich) that provides energy consulting, building physics, HVAC planning, and photovoltaic system design services to property owners, architects, public institutions, and commercial/industrial clients across the Zurcher Oberland region. Founded in 2006 by Werner Hassig as a sole proprietorship, the firm converted to a GmbH in 2008, took a minority investment from regional utility Elektrizitatswerk Jona-Rapperswil AG in 2018, and reincorporated as an Aktiengesellschaft in 2021. Service delivery is organized around three pillars: Beratung + Optimierung (energy consulting including GEAK and Minergie advisory), Planung (HVAC and PV engineering planning following SIA phases), and Messungen (thermography, blower door, humidity and temperature measurement). The firm operates from the Canton of Zurich's first Minergie-A building at Brunnenstrasse 1 in Uster, which also houses a coworking offering (FixDesk, FlexDesk, Private Office) generating ancillary subscription revenue.

The firm's go-to-market is direct and sales-led, anchored by a freemium 45-minute orientation consultation that converts prospects into paid consulting, planning, and measurement engagements. Revenue is generated through quote-based professional services fees supplemented by coworking subscription income. The team of approximately ten includes a Managing Director (Heinrich Horth, since 2024), an overall project leader for building technology, a building physics project leader who is a certified GEAK expert, and two apprentices in building services planning. Marketing relies on the firm's website with online booking, a LinkedIn/Facebook/Instagram presence, a regular newsletter, an extensive library of technical know-how articles, and active membership in industry associations including Minergie, Swissolar, GEAK, and Forum Energie Zurich. Customer references span residential renovations, multi-family Minergie-A construction, school CO2-neutrality planning, industrial PV with battery storage and EV charging, and HVAC work for railway computer systems.

The business model is that of a credentialed regional technical services boutique rather than a scalable software platform. Differentiation rests on independence (unbiased, vendor-neutral recommendations), regulatory certifications (Minergie, GEAK, Swissolar), full-trade coverage from a single provider, and demonstrated outcomes including Minergie compliance, net-zero CO2 via combined PV and heat pump, and 80-90% heat recovery through comfort ventilation. Strategic growth levers visible in the data include the 2018 utility minority investment, the 2022 office expansion into the Minergie-A building, and adjacent coworking revenue, with no disclosed product-software or geographic-expansion initiatives beyond the Zurcher Oberland service area.

Name

Sustech AG

Legal name

Sustech AG

Website

https://sustech.ch

Company type

Private

Founded year

2006

Operating status

Operating

Headcount range

1–10 employees

Short description

Sustech AG is an independent Swiss engineering consultancy in Uster (Zurich) providing energy consulting, HVAC and photovoltaic planning, building physics, and measurement services to homeowners, architects, public institutions, and commercial clients across the Zurcher Oberland region.

Ownership category

akta.pro rank

Product category

Building Energy Consulting

NAICS

Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro industry

PRIMARYBPAHACAK

Sustainability & ESG Consulting

Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Management Consulting

Keywords

• Energy consulting services
• Building technology planning
• Photovoltaic system design
• HVAC engineering services
• Building physics measurement

Headquarters

HQ city

Uster

HQ country

Switzerland

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Consulting Services: Professional engineering consultancy services including energy consulting (GEAK, GEAK Plus), orientation consultations, Minergie consulting, variant comparisons, and monitoring and operational optimization. Services are delivered from initial consultation through to project completion.
2. Building Technology Planning: Complete planning services for heating, ventilation, air conditioning, cooling, and photovoltaic systems following SIA project phases from feasibility study through to construction management and acceptance.
3. Building Measurements and Analysis: Measurement services including thermography, air and component humidity testing, temperature recording, and blower door air tightness testing. Creates neutral analyses, expert opinions, and recommendations.
4. Coworking Space Rental: Flexible workspace rental including FixDesk, FlexDesk, Private Office, meeting rooms, and parking. Provides additional recurring revenue stream from ancillary office services.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Sustech AG is an independent engineering office providing energy and building technology services across three integrated pillars: Beratung + Optimierung (energy consulting including GEAK, Minergie, and variant comparisons), Planung (engineering design for heating, ventilation, climate/cooling, photovoltaic, and building physics systems), and Messungen (building measurements including thermography, blower door air tightness testing, and humidity/temperature recording). The firm serves property owners, architects, and public institutions in the Zürcher Oberland region with vendor-neutral recommendations.

Product overview

Sustech AG is an independent engineering firm for energy and building technology providing integrated consulting, planning, and measurement services from a single source. The core offerings consist of three main service pillars: Beratung + Optimierung (energy consulting and optimization including GEAK and Minergie consulting), Planung (technical engineering for heating, ventilation, air conditioning, photovoltaic, and building physics), and Messungen (building measurements including thermography, blower door testing, and temperature/humidity analysis). The company operates primarily as a professional services firm rather than a software product company, supporting building owners in residential, administrative, educational, healthcare, and industrial sectors across the Zurich Oberland region.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Energy kennzahl (energy reference value) improvements achieving Minergie certification standards (typically below 40 kWh/m²)
• +2 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

Feature4 records

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Regional players

• EKZ (Elektrizitätswerke des Kantons Zürich): Regional Zurich utility with energy consulting and renewable advisory services for building owners. Comparable customer base and energy advisory theme, but operates as a utility subsidiary rather than an independent consultancy.

Direct peers

• Balzer Ingenieure AG: Swiss building technology and energy engineering firm offering HLK planning, Minergie consulting, and energy concepts. Directly overlaps with Sustech's core service mix for residential and commercial projects.
• Eicher+Pauli AG: Swiss engineering firm specializing in energy, HVAC, and building services planning with offices across Switzerland. Highly comparable in core offering (HLK planning, energy consulting, building physics) and customer base.
• R+B engineering AG: Swiss engineering consultancy focused on building technology, energy, and sustainability. Competes for similar planning and energy consulting mandates in the Swiss market.

Broad incumbents

• Amstein+Walter AG: Large Zurich-based engineering consultancy offering energy, building technology, and sustainability services across multiple disciplines. Directly comparable service portfolio but at materially larger scale and broader geographic reach.
• CSD Ingenieure AG: National Swiss engineering group covering energy, building technology, and environmental services. Comparable offerings but with materially larger scale, multiple offices, and broader public-sector reach.

Emerging players

• Enerix Schweiz GmbH: Swiss solar installation franchise with planning, PV, and storage offerings. Comparable on PV planning and self-consumption optimization but installer-led rather than independent advisory, putting it in adjacent competition.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/61562672292018
• LinkedInlinkedin.com/company/sustech-ch
• Instagraminstagram.com/sustech.ch?igsh=MWFhajR4b3h6ZTF0bQ==

Compliance1 record

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 Sustech AG