What Lemon Consult does

Lemon Consult AG is a Swiss engineering consultancy founded in 2000 and headquartered in Zürich that delivers energy efficiency, sustainability, and decarbonization services for buildings and industrial facilities. The firm serves enterprise and public-sector clients across Switzerland and selectively into Germany, with regional offices in Basel and St. Gallen, and operates as a privately held Aktiengesellschaft with 11-50 employees and no disclosed outside investors. Its core customer base spans healthcare (Hirslanden, Insel Gruppe, Universitätsklinik Düsseldorf), food manufacturing (Zweifel Pomy-Chips, Ricola, bio-familia, ARYZTA, Kambly, HUG), real estate (SBB, Post Immobilien, CKW), logistics (Planzer), and hospitality (Bindella), with engagements typically structured as fixed-fee or hourly project work.

Lemon Consult's service portfolio covers the full building lifecycle, from sustainability strategy consulting, decarbonization roadmaps, and energy/technical concepts, through building simulation, building physics and acoustics, to operational energy optimization and certification management for standards such as SNBS, DGNB, LEED, MINERGIE, BREEAM, and 2000-Watt-Areal. The underlying technical work relies on building-physics simulation, lifecycle assessment methodologies, Pinch analysis, and operational optimization tools rather than a proprietary software platform, and the firm has research and development capability demonstrated through pilot projects such as the Hobelwerk climate-friendly neighbourhood.

The commercial model is direct, sales-led consulting: Lemon Consult bids on tenders and project proposals, and monetizes through professional-services engagements, augmented by partnerships with Swiss sustainability bodies (SGNI, SIA, eco-bau, EnAW, swiss cleantech, NNBS, Forum Energie Zürich, swissesco, IHS). Quantified client outcomes include 0.8-1.1 year payback periods on operational optimization, 13-18% energy savings, 90%+ CO2 emission reductions on industrial decarbonization mandates, and 98% CO2 reduction through renewable energy transitions. The firm was recognized as a Kununu Top Company 2025, supporting its positioning as an employer of choice in a tight Swiss engineering talent market.

Name

Lemon Consult

Legal name

Lemon Consult AG

Website

https://lemonconsult.ch

Company type

Private

Founded year

2000

Operating status

Operating

Headcount range

11–50 employees

Short description

Lemon Consult AG is a Swiss engineering consultancy delivering energy efficiency, decarbonization, building physics, and sustainability certification services to enterprise and public-sector clients across Switzerland and Germany.

Ownership category

akta.pro rank

Product category

Sustainability & Energy Consulting Services

NAICS

Environmental Consulting Services (54162), Management, Scientific, and Technical Consulting Services (5416)

SIC

Services-Management Consulting Services (8742)

akta.pro primary industry

Sustainability & ESG Consulting (BPAHACAK)

akta.pro secondary industry

Climate Governance, Operating Model & Internal Carbon Pricing Design (EUABAKAF)

Keywords

• Energy consulting services
• Sustainability consulting
• Building physics engineering
• Decarbonization strategy
• Energy efficiency consulting

Headquarters

HQ city

Zürich

HQ country

Switzerland

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Sustainability Consulting Services: Project-based consulting engagements for energy efficiency, decarbonization strategies, building physics, and sustainability certification for commercial, industrial, and public sector clients

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Lemon Consult AG is a Swiss engineering consultancy that delivers sustainability, energy efficiency, and decarbonization consulting services for buildings, industrial facilities, and areas. Its portfolio covers the full building lifecycle — from competition support, energy and technical concepts, building simulation, and building physics/acoustics, through sustainability certification (SNBS, DGNB, LEED, MINERGIE, 2000-Watt-Areal), to operational energy optimization and decarbonization strategy for net-zero emissions.

Product overview

Lemon Consult is a Swiss sustainability and energy consulting firm offering a comprehensive portfolio of professional services for the built environment. Their offering consists of consulting services rather than a software product platform, encompassing sustainability strategy consulting, building physics and acoustics, energy and technical concepts, building simulation, and energy operating optimization. Services are delivered through specialized consulting engagements including certification support for labels like SNBS, DGNB, MINERGIE, LEED, and BREEAM, as well as condition analysis, competition support for architecture competitions, and research and development projects. The company serves clients across Switzerland and Germany, focusing on energy efficiency, decarbonization, and sustainable building.

Differentiator

Problem solved

Functional benefit

Products and services

• Strategieberatung Nachhaltigkeit (Sustainability Strategy Consulting) Strategic consulting service helping enterprise and public sector clients define, structure, and achieve their sustainability goals across buildings, operations, and corporate strategy.
• Wettbewerbsbegleitung (Competition/Study Commission Support) Expert support for architectural competitions, study commissions, and test planning in sustainability, energy efficiency, building physics, and acoustic engineering.
• Energie- und Technikkonzepte (Energy and Technical Concepts) Development of holistic energy and technical concepts for buildings and entire areas.
• Gebäudesimulation (Building Simulation) Building simulation services for thermal comfort, plant optimizations, daylight quality, and microclimate/wind comfort analysis.
• Nachhaltigkeitsberatung Labels (Sustainability Certification Consulting) Sustainability consulting for certification labels including SNBS, MINERGIE, DGNB, LEED, BREEAM, and 2000-Watt-Areal.
• Bauphysik und Akustik (Building Physics and Acoustics) Building physics and acoustics consulting including thermal protection, sound insulation, and noise protection.
• Qualitätssicherung, Nachhaltigkeit und Technik, Second Opinion (Quality Assurance & Second Opinion) Independent quality assurance for sustainability and technology with second-opinion assessments on building projects.
• Energie- und Ressourceneffizienz im Betrieb (Operational Energy and Resource Efficiency) Energy and resource efficiency consulting for building operations to reduce consumption and costs.
• Energetische Betriebsoptimierung (Energy Operational Optimization) Energy operating optimization services using BO-tools to identify and implement energy savings in building technical systems.
• Zustandsanalyse und Massnahmenplanung (Condition Analysis and Measure Planning) Condition analysis and measure planning for existing building systems including heating, ventilation, electrical, and building physics; includes pinch analysis for industrial waste heat.
• Spezialisierte Gebäudetechnikplanung (Specialized Building Technology Planning) Specialized building technology planning for complex energy and sustainability projects.
• Forschung und Entwicklung (Research and Development) Research and development services including pilot and demonstration projects for innovative sustainable building solutions.
• Dekarbonisierungsstrategien (Decarbonization Strategies) Decarbonization strategy development to help industrial and commercial clients transition to fossil-free operations and achieve net-zero emissions.

Quantifiable outcome

• Decarbonization strategies achieving 90%+ CO2 emission reduction in industrial production facilities
• +5 more outcomes

Named customers12 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

Twelve partnerships are on record, tiered core and minor.

• DGNBcoreStrategic or Co-development PartnerGerman Sustainable Building Council certification system partner. Lemon Consult provides DGNB certification coordination and consulting services for building projects in Switzerland.
• SNBS Bestand und BetriebcoreStrategic or Co-development PartnerSwiss platform for sustainable building operation and maintenance. Lemon Consult has certified experts for SNBS Bestand und Betrieb, a GRESB-recognized standard.
• SGNIcoreStrategic or Co-development PartnerSwiss Society for the Promotion of Sustainability in Real Estate. Lemon Consult team members serve as auditors and experts for SGNI certification.
• LEEDcoreStrategic or Co-development PartnerLeadership in Energy and Environmental Design certification. Lemon Consult provides LEED consulting services for building projects seeking this certification.
• SIAcoreStrategic or Co-development PartnerSwiss Society of Engineers and Architects. Lemon Consult team members participate in SIA technical committees and contribute to standards development.
• eco-bauminorStrategic or Co-development PartnerAssociation for ecological, circular, and healthy building. Lemon Consult team members serve as eco-bau experts for sustainable construction consulting.
• Energie-Agentur der Wirtschaft (EnAW)minorStrategic or Co-development PartnerEnergy Agency for the Swiss economy. Lemon Consult team members serve as moderators for companies participating in EnAW energy management programs.
• swiss cleantechminorStrategic or Co-development PartnerSwiss business association for a CO2-neutral Switzerland. Lemon Consult participates as a member supporting climate protection initiatives.
• NNBSminorStrategic or Co-development PartnerNetwork for Sustainable Construction Switzerland. Lemon Consult participates as a member supporting sustainable building practices in Switzerland.
• Forum Energie ZürichminorStrategic or Co-development PartnerAssociation for sustainable and future-oriented energy use in building lifecycles. Lemon Consult participates in energy planning initiatives in the Zurich region.
• swissescominorStrategic or Co-development PartnerSwiss Association for Energy Saving Contracting. Lemon Consult provides expertise in energy saving contracting for building optimization projects.
• IHSminorStrategic or Co-development PartnerNetwork of technical leaders and specialists from the hospital environment. Lemon Consult serves hospital clients and participates in IHS professional network.

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• Ernst Basler + Partner (EBP): Swiss planning, engineering and consulting firm with similar building physics, energy and sustainability practices. Comparable as a German-Swiss firm serving enterprise and public-sector clients across the full project lifecycle from concept through operations.
• Ecoplan: Swiss research and consulting firm focused on sustainable development, energy and mobility policy. Comparable as a Swiss sustainability consultancy serving public-sector and corporate clients, though more policy- and economic-research oriented.
• South Pole Group: Swiss-headquartered climate strategy and carbon solutions firm. Comparable as a Swiss-based sustainability consultancy serving enterprise clients on decarbonization strategies and climate programs, with similar project-based professional services model.
• Amstein+Walthert: Swiss engineering and consulting firm specialized in building technology, energy, and sustainability. The closest direct peer to Lemon Consult given overlapping DACH focus on building physics, energy efficiency, and certification services for enterprise and public-sector clients.
• INFRAS: Swiss research and consulting firm in mobility, energy, environment, and spatial development. Comparable as a Swiss-headquartered sustainability consultancy to enterprise and public-sector clients, though more research-oriented than Lemon's building-physics focus.

Broad incumbents

• WSP in Switzerland: Global engineering consultancy with a Swiss practice spanning building physics, energy and sustainability. Comparable as a broader incumbent offering overlapping services for enterprise and real-estate clients, but with much larger scale and multi-geography delivery.
• Deloitte Switzerland (Sustainability Services): Big Four advisory practice with a growing Swiss sustainability, climate and ESG consulting offering. Comparable for CSRD/climate strategy and enterprise sustainability mandates, competing through audit-advisory integration and global scale rather than specialist depth.
• Ramboll: Nordic-headquartered global engineering, design and sustainability consultancy. Comparable as a broader international incumbent offering sustainability, building physics and decarbonization services, with cross-border capacity that Lemon Consult currently lacks.
• EY Switzerland (Climate Change and Sustainability Services): Big Four assurance and advisory firm with a Swiss climate and sustainability consulting practice. Comparable for sustainability strategy, reporting and decarbonization work targeting large enterprises, with broader portfolio but less specialist building-physics depth.

Regional players

• Drees & Sommer: German engineering consultancy with deep focus on construction, real estate and sustainability. Comparable for energy and sustainability advisory to enterprise clients but primarily serving the German market rather than direct competition in Switzerland.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInch.linkedin.com/company/lemon-consult-ag

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Lemon Consult