What W4Y Adviseurs does

W4Y Adviseurs bv is an independent Dutch advisory firm headquartered in Harderwijk, Netherlands, founded in 2011 by Mike Lap, Gerke Mazier, and Jan Roersen. The firm specializes in building-installed installations (electrical and mechanical) and sustainability advisory, organized around four service pillars: (1) design and advisory on E and W installations, (2) construction project management and TVVL-certified commissioning, (3) inspection, management, and maintenance of installations, and (4) sustainability certification across BREEAM-NL (Expert and Assessor across In-Use, New Build, and Portfolio), Fitwel (Ambassador status), GPR Gebouw, BCI Gebouw (circularity), and EED Energy Audits. With over 700 BREEAM certification projects completed, the firm positions itself as a leading authority on sustainable building certification in the Netherlands.

The firm operates a project-based professional services model with multi-year enterprise engagements, serving as long-term "huisadviseur" to marquee Dutch clients including C&A (since 2011), KFC, Redevco, ABN AMRO, Lidl, CBRE Global Investors, DHL Parcel, Equinix, FrieslandCampina, Van der Valk, the Van Gogh Museum, and Hogeschool van Amsterdam. Go-to-market is direct enterprise field sales, supported by referral-driven acquisition and a partnership with DGBC (Dutch Green Building Council). The team of approximately 20 advisors includes multiple BREEAM experts and assessors, Fitwel ambassadors, GPR experts, BCI Gebouw experts, and TVVL-certified commissioners.

In April 2026, the shares of W4Y adviseurs bv were acquired by Kewaco, integrating the firm into a broader Dutch group of advisory and project management organizations that also includes Galjema B.V. Technisch Adviesbureau and BBC Bouwmanagement. W4Y continues to operate independently under its own brand, location, and team. Leadership transitioned in 2024-2025: co-founder Gerke Mazier retired in September 2024, and Marc de Jong joined the directie effective January 1, 2025, joining Annelies Visser and continuing co-founders Mike Lap and Jan Roersen. The firm was recognized as a BREEAM Champion / BREEAM Awards 2021 Winner.

Name

W4Y Adviseurs

Legal name

W4Y adviseurs bv

Website

https://w4y.nl

Company type

Private

Founded year

2011

Operating status

Operating

Headcount range

11–50 employees

Short description

W4Y Adviseurs is an independent Dutch consultancy based in Harderwijk providing advisory on building-installed electrical and mechanical installations, BREEAM-NL sustainability certification, commissioning, and EED energy audits to enterprise clients across the Netherlands.

Ownership category

akta.pro rank

Product category

Building Engineering and Sustainability Consulting

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Construction Engineering & Constructability Consulting (BPAHAIAN)

akta.pro secondary industries

System & Subsystem Commissioning (Mechanical/Electrical/I&C) (EUAEAJAB), Certification Support (Stage 1/2) & External Audit сопровождение (EUAHAIAF)

Keywords

• Building installations consulting
• BREEAM certification services
• Sustainability advisory
• Commissioning validation services
• Energy efficiency audits

Headquarters

HQ city

Harderwijk

HQ country

Netherlands

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Advisory and Consultancy Services: W4Y generates revenue through professional advisory and consultancy engagements covering design and advice on building-installed installations, project management during construction execution, commissioning, inspection, management and maintenance of installations, and sustainability certifications (BREEAM, GPR, Fitwel, BCI). Revenue is project-based and likely follows standard consultancy fee structures.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

W4Y Adviseurs is an independent Dutch consultancy providing advisory, design, project management, commissioning, inspection/maintenance, and sustainability certification services for electrical and mechanical building installations. The firm guides clients through BREEAM-NL, GPR Gebouw, Fitwel, BCI Gebouw, and EED energy audit certification processes, with over 700 BREEAM certification projects completed. Core deliverables include installation design, construction execution support, TVVL-certified commissioning (SAT/FAT), and structured management and maintenance of building installations.

Product overview

W4Y Adviseurs is an independent advisory firm specializing in building-related installations and sustainability, operating from Harderwijk, Netherlands. The company offers an integrated service portfolio organized into four core areas: (1) Ontwerp en Advies for electrical and mechanical installation design, (2) Uitvoering Bouw for project management and construction execution including commissioning, (3) Beheer for inspection and maintenance services, and (4) Duurzaamheid for sustainability certifications. Within sustainability, W4Y provides specialized sub-services including BREEAM-NL certification (as certified Expert and Assessor), EED energy audits, BCI Gebouw circularity assessments, and Fitwel health certifications. The company serves diverse sectors across the Netherlands with over 700 BREEAM certification projects completed.

Differentiator

Problem solved

Functional benefit

Products and services

• Ontwerp en Advies Gebouwgebonden Installaties (Design and Advisory for Building Installations) Expert advice and design of building-related electrical and mechanical installations, translating opportunities, costs, and constraints into practical, executable plans for property owners, developers, and corporate clients.
• Uitvoering Bouw - Projectmanagement en Begeleiding (Construction Execution and Project Management) Professional project management, construction execution support, and commissioning services during building projects, providing structure, coordination, and quality/cost control across all construction phases.
• Beheer en Onderhoud Gebouwgebonden Installaties (Inspection, Management and Maintenance of Building Installations) Inspection, energy audits, and ongoing management and maintenance services for building installations, providing continuity assurance, operational cost control, and process improvement for property owners and corporate end users.
• Duurzaamheid - BREEAM-NL Certificering (Sustainability and BREEAM-NL Certification) Sustainability advisory and BREEAM-NL certification guidance for new builds, renovations, and existing buildings (In-Use), including GPR Gebouw and Fitwel certifications, delivered by certified BREEAM Experts and Assessors.
• Commissioning, Validatie en Toetsing (Commissioning, Validation and Testing) Testing, verification and validation of critical building installations and processes across all construction phases and the operational phase, including SAT/FAT testing, delivered by TVVL-certified commissioners for data centers, hospitals, and infrastructure projects.
• EED Energie-audit (EED Energy Audit) European Energy Efficiency Directive (EED) compliance audits providing detailed overviews of energy consumption and cost-effective energy-saving measures, including quantification of savings potential over 4 years and integration with sustainability policy.
• BCI Gebouw - Building Circularity Index Circularity measurement service using the Building Circularity Index (BCI) to determine the circular potential of new or existing buildings, focusing on disassembly and material use, and integrated within BREEAM-NL and GPR certifications.
• Fitwel Certificering (Fitwel Certification) Advisory and support for achieving Fitwel certification for healthy and sustainable real estate, delivered by certified Fitwel Ambassadors and addressing seven health impact categories for all building users.

Quantifiable outcome

• Over 700 BREEAM certification projects completed
• +4 more outcomes

Named customers16 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

Feature5 records

Partnerships

Six partnerships are on record, tiered core, major and minor.

• KewacocoreStrategic or Co-development Partner · 29 April 2026In April 2026, Kewaco acquired all shares of W4Y Adviseurs bv, making W4Y part of a broader group of advisory and project management organizations. Within Kewaco, W4Y joins Galjema B.V. Technisch Adviesbureau and BBC Bouwmanagement. The acquisition enables integrated advice on sustainability, installation engineering, and project management. W4Y continues to operate under the same name, from the same location, with the same people.
• Croonwolter&droscoreStrategic or Co-development Partner · 18 October 2023W4Y collaborated with Croonwolter&dros to develop autonomous energy supply solutions for grid congestion challenges. For the Kobelco project in Lelystad, the partnership designed a solution combining PV panels, battery storage, backup power, and Eaton energy management systems. Croonwolter&dros will maintain and monitor the system post-construction.
• Groothuis BouwgroepcoreImplementation/ SI/ Consulting Partner · 18 October 2023Groothuis Bouwgroep engaged W4Y to investigate scenarios and concepts for addressing grid congestion for the Kobelco project in Lelystad. W4Y developed an autonomous energy supply solution that Groothuis implemented in the construction of Kobelco's new European headquarters.
• JebbermajorImplementation/ SI/ Consulting Partner · 30 June 2023W4Y advisor Reinier den Uijl performed commissioning for Jebber on multiple projects (De Trip, De Kwekerij, and High Five in Utrecht) — Jebber develops youth housing for students and starters in Utrecht, Rotterdam, and Groningen. Jebber certifies its real estate under BREEAM NL.
• DGBC (Dutch Green Building Council)coreStrategic or Co-development PartnerW4Y is an official partner of DGBC (Dutch Green Building Council), the organization behind BREEAM in the Netherlands. This partnership positions W4Y as a recognized expert in sustainable building certification.
• bouAd AdviesgroepminorImplementation/ SI/ Consulting PartnerbouAd Adviesgroep engaged W4Y for installation technical advice on the renovation and new construction of the Institute for Energy and Transport (IET) in Petten, commissioned by the European Commission. W4Y designed the installations for the new entrance building and conducted an integral energy study for the IET complex.

Scale indicators3 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• Witteveen+Bos: Witteveen+Bos is a Dutch engineering consultancy with expertise in buildings, installations, energy and sustainability. Comparable to W4Y on technical advisory and sustainability services for Dutch real estate but with broader infrastructure and water footprint.
• Sweco Netherlands: Sweco is a large European engineering consultancy with a strong Dutch practice covering installation advisory, sustainability and BREEAM-adjacent services. Overlaps with W4Y on MEP design and sustainability advisory but as part of a much broader portfolio across infrastructure, water and buildings.
• Buro Happold: Buro Happold is an international engineering consultancy with a strong sustainability, MEP and BREEAM advisory practice across Europe. Comparable to W4Y on integrated sustainability and installation advisory, particularly for mission-critical and high-performance buildings, but with much broader geographic reach.
• Royal HaskoningDHV: Royal HaskoningDHV is a major Dutch-rooted engineering consultancy with deep Dutch real estate, building services and sustainability practices (now including legacy DGMR). Competes with W4Y for enterprise installation and sustainability mandates but at much greater scale and across many sectors.
• Arcadis Netherlands: Arcadis is a global design, engineering and consultancy firm with a substantial Dutch buildings practice covering sustainability, MEP design and project management. Overlaps with W4Y on sustainability certification advisory and installation consulting at the top end of the Dutch market.

Others

• TVVL / ISSO knowledge partners: TVVL is the Dutch knowledge platform for building services and installation technology, whose certification framework underpins W4Y's TVVL-certified commissioning capability. Included as an ecosystem enabler rather than direct competitor — TVVL sets standards that W4Y's commissioners operate within, and many Dutch installation consultancies hold TVVL certifications.

Direct peers

• CFP Green Buildings: CFP Green Buildings is a Dutch consultancy focused on BREEAM-NL, WELL, GPR and energy labels for Dutch real estate owners, developers and investors. Directly comparable to W4Y's sustainability certification practice and competes for the same BREEAM-NL advisory mandates.
• DWA Installation & Energy Advice: DWA is a Dutch independent consultancy specializing in building installations (E&W), energy and sustainability — essentially W4Y's most direct Dutch peer in MEP advisory and BREEAM-style sustainability services. Operates across design, commissioning, and certification for Dutch real estate, making it a direct competitor for the same client set.
• BBA+ Experts (part of RPS Group): BBA+ is a Dutch BREEAM-NL and sustainability consultancy that competed head-to-head with W4Y on certification mandates before joining RPS. Direct overlap in BREEAM-NL advisory, GPR and energy consulting for Dutch real estate portfolios.
• DGMR (now Royal HaskoningDHV Building Services): DGMR was a leading Dutch building services (installatietechniek) consultancy covering acoustics, MEP, fire safety and sustainability. Comparable to W4Y in scope, with a longer heritage and broader Dutch client base; the legacy DGMR practice now sits within Royal HaskoningDHV.

Market position

Strengths1 record

Weaknesses5 records

Competitive moat3 records

Key risks1 record

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/w4y-adviseurs

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles7 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 W4Y Adviseurs