Halmos Adviseurs

What Halmos Adviseurs does

Halmos Adviseurs is a Dutch technical advisory firm founded in 1978 and headquartered in Den Haag, Netherlands, specializing in building-services engineering consultation. The firm advises on HVAC, electrical installations, building physics, fire safety, and sustainable building technologies for complex real-estate and infrastructure projects, serving clients that include airports, hospitals, universities, financial institutions, retail operators, and central and local government bodies. Its technical offering is anchored by a proprietary methodology called the Earth, Wind and Fire (EWF) climate concept, supported by 3D BIM design capability, CFD-based building-physics simulation, and BREEAM and BRL 6000-21 (heat-and-cold-storage) advisory competencies.

The firm employs roughly 25 staff and operates from a monumental building in Den Haag, with a workforce characterized by exceptional tenure — approximately 80% of employees have remained with the firm for more than 10 years and recorded sickness absence runs below 1%. Halmos holds ISO 9001, 14001, and 9004 certifications, is VCA-certified, and is a signatory of the Paris Proof Commitment and a participant of the Dutch Green Building Council.

Halmos generates revenue through project-based advisory fees tied to design, certification, and supervision engagements, with no disclosed subscription or retainer pricing model. Since June 2024 the firm has operated as part of the INNAX group, which provides a larger platform for sustainability-focused engineering services in the Dutch market. Named clients include IKEA (a relationship dating to 2000), Schiphol, ING, St. Antonius Ziekenhuis, Universiteit Leiden, Rijksvastgoedbedrijf, Gemeente Utrecht, Wageningen University, St Jansdal Ziekenhuis, and ARTIS, with long-standing design partners including IAA Architecten, ABT Constructeurs, and Paul de Ruiter Architects.

Name

Halmos Adviseurs

Legal name

Halmos B.V.

Website

https://halmos.nl

Company type

Private

Founded year

1978

Operating status

Operating

Headcount range

11–50 employees

Short description

Halmos Adviseurs is a Den Haag-based technical advisory firm, founded in 1978 and part of INNAX since 2024, that consults on building installations (HVAC, electrical, building physics, sustainability) for Dutch airports, hospitals, universities, government, and corporate clients.

Ownership category

akta.pro rank

Product category

Building Services Engineering Consulting

NAICS

Engineering Services (541330), Architectural, Engineering, and Related Services (5413), Management, Scientific, and Technical Consulting Services (5416), Environmental Consulting Services (541620)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Building Automation & Controls (BAS/BMS) Contracting (IMAFALAE)

akta.pro secondary industries

HVAC & Refrigeration Contracting (IMAFALAB), Building Management & Facility Control Systems (BMS/BAS, Power Monitoring, EPMS) (EUAEAFAJ), Security, Safety & Fire/Life Safety Management (BPABAAAE)

Keywords

• Building installation consulting
• HVAC advisory services
• Sustainable building design
• Building physics advisory
• Technical installation engineering

Headquarters

HQ city

Den Haag

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Technical Advisory Services: Halmos generates revenue through providing technical advisory services for building installations. They design, advise, innovate, and guide building projects. Revenue comes from project-based consulting engagements for various building types including healthcare, education, government, and commercial facilities.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Halmos Adviseurs is an independent technical advisory bureau that designs, calculates, specifies, and supervises electrotechnical (E) and mechanical (W) building installations for hospitals, universities, government buildings, retail, aviation, and cultural facilities. Services span HVAC and electrical systems, building physics and CFD simulations, sustainability and energy consulting, WKO heat/cold storage design, 3D BIM modeling, monitoring and commissioning, and BREEAM certification support. The firm collaborates closely with architects, contractors, and building owners from concept through construction across the Netherlands.

Product overview

Halmos Adviseurs is an independent advisory bureau for technical building facilities, offering a unified portfolio of consultancy services centered on electrotechnical (E) and mechanical (W) installations. The core offering consists of technical advisory services for building installations, supported by specialized modules including sustainability and energy efficiency consulting, building physics advisory, WKO (heat-cold storage) systems, monitoring and commissioning, and BREEAM certification advisory. The company also employs proprietary methodologies such as the Earth Wind and Fire (EWF) climate concept. Services are delivered through close collaboration between E and W specialists, with a focus on sustainability, energy efficiency, and human comfort within budget constraints. Halmos operates as part of INNAX, a multidisciplinary building sustainability company, following its acquisition in June.

Differentiator

Problem solved

Functional benefit

Products and services

• Technical Building Installations Advisory Services Comprehensive advisory services covering design, calculations, specifications, and construction supervision for electrotechnical (E) and mechanical (W) building installations, delivered to building owners, architects, and contractors on healthcare, education, government, aviation, retail, and cultural projects.
• Sustainability and Energy Efficiency Consulting Advisory services focused on sustainability, energy conservation, and reducing fossil fuel usage through techniques such as WKO systems, PV panels, LED lighting, and hybrid ventilation, delivered to institutional and commercial building projects.
• Building Physics Advisory Simulations and calculations for comfortable indoor climates, CFD studies for fire situations, daylight systems, and sustainability/energy advisory, offered as a stand-alone advisory service for building projects.
• Monitoring and Commissioning Services ensuring that buildings and technical facilities achieve maximum performance, including monitoring and sustainable management and maintenance consulting for completed projects.
• WKO (Heat and Cold Storage) Systems Advisory Design and management of underground thermal energy storage (WKO) systems for heating and cooling buildings, recognized under BRL 6000-21 by Bodem+ for both design and management.
• Earth Wind and Fire (EWF) Climate Concept Proprietary natural ventilation concept using wind-driven air intake, water-based conditioning in a gravity-fed shaft, and solar chimney exhaust, achieving over 50% energy savings and 90% fan energy reduction for climate-controlled buildings.
• BREEAM Certification Advisory Advisory services supporting clients in achieving BREEAM sustainability certification for buildings, with prior delivery including a BREEAM OUTSTANDING-rated project recognized as the most sustainable renovated building in the Netherlands.

Quantifiable outcome

• Over 50% energy savings with Earth Wind and Fire ventilation system
• +2 more outcomes

Named customers10 records

Segments5 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

Partnerships

Five partnerships are on record, tiered minor and core.

• Bouwcampus Diepenbeek PartnersminorStrategic or Co-development Partner · 1 January 2025Halmos is the Advisor for the EWF (Earth Wind and Fire) system for Bouwcampus 2.0 in Belgian Limburg. The project involves Belgian and Dutch companies working together on an innovative circular building with a unique driven ventilation system.
• INNAXcoreStrategic or Co-development Partner · 1 June 2024Halmos became part of INNAX as of June 1, 2024. INNAX is a multidisciplinary building sustainability company with locations in Veenendaal, Heerenveen, Tilburg, and Baarn. This partnership creates new possibilities for both employees and clients, combining Halmos's 45+ years of expertise with INNAX's sustainability capabilities. Both companies are Paris Proof Partners of the Dutch Green Building Council.
• IAA ArchitectencoreStrategic or Co-development PartnerArchitectural partner for St Jansdal Hospital projects, including the renovation in Harderwijk and new hospital in Lelystad. Halmos collaborates closely with IAA Architecten on hospital design projects.
• ABT ConstructeurscoreStrategic or Co-development PartnerEngineering partner for St Jansdal Hospital projects. Part of the collaborative team working on hospital construction and renovation.
• Paul de Ruiter ArchitectscoreStrategic or Co-development PartnerLong-standing collaboration on innovative projects including MFO II at Erasmus University Rotterdam and Bijlmer Parktheater. Ron van der Plas of Halmos designed the EWF concept for MFO II.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Nieman Raadgevende Ingenieurs: Nieman is a Dutch consulting engineering firm focused on building technology, installations, fire safety, and sustainability. Its advisory scope on mechanical and electrical installations for healthcare, education, and government buildings directly overlaps Halmos's core services.
• DWA Installatie- en Energieadvies: DWA is a Dutch installation and energy consultancy providing HVAC, energy, and sustainability advisory for residential, healthcare, and commercial buildings. Its scope and client base in the Netherlands make it a close peer to Halmos.
• DGMR (adviseurs bouw, installaties en milieu): DGMR is a Dutch engineering consultancy specializing in building installations, acoustics, and environmental performance. Like Halmos, it advises on HVAC, building physics, and sustainability across healthcare, government, and commercial buildings, making it a closely comparable independent technical advisory peer.
• INNAX: INNAX is a multidisciplinary Dutch building sustainability and decarbonization firm with offices in Veenendaal, Heerenveen, Tilburg, and Baarn. It became Halmos's parent company in June 2023/2024, offering closely overlapping building sustainability advisory services and a logical peer comparison for scale and scope of Dutch building services work.
• Valstar-Simonis: Valstar-Simonis is a Dutch consultancy advising on building installations, energy, and sustainability for hospitals, offices, and laboratories. Its healthcare-focused HVAC and energy advisory directly parallels Halmos's hospital and university work.
• Techniplan Adviseurs: Techniplan is a Dutch consultancy focused on technical building installations, energy, and fire safety. It serves healthcare, government, and commercial clients with mechanical and electrical advisory, overlapping Halmos's installation advisory niche.

Broad incumbents

• Sweco: Sweco is a major European engineering, design, and consulting firm with significant Dutch operations in buildings, energy, and sustainability advisory. It is a broader incumbent offering overlapping building installation and energy advisory services to Dutch and Nordic clients.
• Arcadis: Arcadis is a global design, engineering, and consulting firm with substantial Dutch buildings and sustainability practices. While operating across many sectors and geographies, it competes for Dutch building installation and sustainability advisory mandates similar to Halmos.
• Royal HaskoningDHV: Royal HaskoningDHV is a large international engineering consultancy with substantial Dutch building services and sustainability advisory practices. It competes for similar building installation advisory work but operates at much greater scale across multiple sectors.

Emerging players

• Klictet: Klictet is a Dutch firm advising on building installations, energy systems, and sustainable technologies. As a smaller, focused peer, it competes for similar mid-sized technical advisory mandates across the Dutch built environment.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/halmos-b.v.-adviseurs
• Xx.com/HalmosAdviseurs

Compliance7 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles13 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 Halmos Adviseurs