About Hayes Mechanical & Engineering

Structural, Mechanical, HVAC, Inspections, Project Management & Compliance — all under one roof.

Hayes Mechanical & Engineering Welder
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Built on International Standards. Delivering Across Ireland, UK and Europe!

About Hayes Mechanical & Engineering

About Mission Vision

Hayes Mechanical & Engineering is a specialist mechanical and structural engineering contractor serving main contractors, developers, data centre operators, pharmaceutical manufacturers, and project teams across Ireland, the UK, and Europe. We combine deep technical expertise with a direct, client-focused approach – giving every project a skilled team, clear documentation, and dependable delivery from brief to handover.

Our two core services cover the full scope of mechanical and structural engineering: from high-purity stainless steel process pipework and HVAC building services, CHW and LPHW systems, BMS, and package plant rooms – through to structural steel fabrication and installation. Both services are delivered from our purpose-built workshops in Co. Mayo – a 16,000 sq ft carbon steel facility and a fully segregated 7,000 sq ft stainless steel workshop.

Whether you are delivering a data centre, a pharmaceutical facility, a commercial development, or a healthcare project, we bring the engineering rigour, fabrication capability, and on-site experience your project demands.

Our mission is to deliver mechanical and structural engineering solutions that are precise, fully compliant, and built around our clients’ goals. We believe exceptional engineering means clear communication, thorough documentation, and results that stand up to scrutiny — on every project, for every client, without exception.

Our vision is to be the most trusted mechanical and structural engineering consultancy for clients across Ireland and Europe — recognised for our technical precision, responsive service, and ability to deliver complex engineering to the highest international standards.

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Our Story

From a Workshop in Mayo to Projects Across Europe

Hayes Mechanical & Engineering was established in 2015 in Ballintober, Co. Mayo by Alana and Seanie Hayes – two people who understood what proper fabrication looks like. Both founders brought years of hands-on experience from large-scale pipe fabrication workshops in Australia, where quality standards, weld traceability and client accountability are embedded in every stage of delivery.

That international perspective shaped the foundation of HM&E. The business wasn’t built on ambition alone – it was built on knowing what good looks like and being willing to work toward it consistently.

Like most strong businesses, HM&E started small. Early projects were won through capability, not credentials. Every job mattered. Every client relationship counted. Through consistent delivery and a refusal to cut corners, the company built a reputation for reliability, workmanship and follow – through.

Today, HM&E delivers mechanical pipework, structural steel and modular fabrication projects across Ireland, the United Kingdom and mainland Europe – bringing the same level of precision and accountability to every engagement. We build multi – family and affordable housing communities, industrial facilities, public and private healthcare facilities, fitness centers and office buildings. We improve the supply chain management process, increase operational efficiencies and build environments.

silhouette of the steel structure
2016 Founded
In Co. Mayo
0 + Experienced
Team Members
0 Dedicated
Workshops
0 + Countries
Delivered

Our Journey

2015
Started
The Journey Begins

Seanie and Alana Hayes return to Ireland from Australia, where Seanie had worked extensively on pipe fabrication for oil and gas processing facilities. What was meant to be a temporary stop becomes the start of something bigger when the first job leads to another - and another.

2016
Founded
Hayes Mechanical & Engineering Founded

HM&E is formally established in Ballintober, Co. Mayo. Operating as a small, tightly-focused team, the company builds its reputation project by project - prioritising quality, reliability and doing the job right over rapid growth.

2018
Workshop Established
First Fabrication Workshop Established

Investing in their own facilities, Seanie and Alana move work in-house - marking a critical shift from site-only delivery to controlled workshop fabrication. This decision defines the company's approach to quality for years to come.

2020
Certifications
ISO Certifications Achieved

HM&E achieves ISO 9001 (Quality Management), ISO 14001 (Environmental Management Safety) and ISO 45001 (Occupational Health & Safety) certification - formal recognition of the systems and standards that had always underpinned the business.

2021
Accreditation
EN1090 EXC2 & EXC3 Accreditation

HM&E is accredited to BS EN 1090 EXC2 & EXC3 for CE marking of structural steelwork - one of the highest execution class certifications available and a key qualification for major data centre and industrial projects.

2022
New Workshop Established
Dedicated Stainless Steel Workshop Opens

A second, fully segregated stainless steel workshop (7,000 sq. ft.) is brought online - ensuring clean, controlled fabrication for pharmaceutical and life sciences clients with zero cross-contamination risk.

2023
Award
Irish Steel Awards - Growth & Excellence

HM&E wins the Growth & Excellence Award at the 2023 Irish Steel Awards Night in Portlaoise - industry recognition of the company's rapid development, quality standards and project delivery record.

2024 - Present
Expanding in Different Countries
Delivering Across Ireland, UK & Europe

With 50+ employees and two purpose-built workshops, HM&E is delivering high-spec mechanical and structural engineering for data centres, pharmaceutical, water treatment and infrastructure clients across three countries.

We are dedicated to serve

Expert Team Members

Statistics

Explore Our Extensive Industrial Expertise.

Discover our broad industrial expertise, delivering innovative and reliable solutions for your business.

Time Management
85%
Project Management
70%
Mechanical Projects
92%
Structural Steel Projects
78%
Our certifications are not badges - they are the foundation of every project we deliver.

Accredited. Certified. Compliant.

EN1090 EXC2 & EXC3 - Structural Steel
HM&E holds BS EN 1090-2 accreditation for CE marking of structural steelwork, certified to Execution Class 2 & 3 - the standard demanded by data centres, pharmaceutical facilities and major industrial projects. This accreditation covers the design, fabrication and erection of structural steel components to the highest European classification.
ISO 9001, ISO 14001 & ISO 45001 Certified
Our ISO 9001 Quality Management System ensures that every project is managed, documented and delivered to a consistent and auditable standard. Our ISO 14001 ensures the environmental safety and complies with the laws made for saving the environment. Our ISO 45001 Occupational Health & Safety certification reflects our unwavering commitment to sending every person home safely, every day. Both are maintained under annual surveillance audits.
ASME IX & EN15614 Welding Standards
All welding at HM&E is carried out in line with ASME Section IX and EN ISO 15614 standards, with full weld traceability maintained throughout. Our welders are qualified to the relevant procedures, and every weld is traceable from material origin through to final inspection record - critical for pharmaceutical, data centre and process engineering clients.

Sectors We Deliver For

High-spec mechanical pipework, structural steel and modular systems for hyperscale and co-location data centre projects.
Dedicated stainless steel fabrication in a segregated, controlled environment — meeting the stringent hygiene and traceability requirements of pharmaceutical clients.
Mechanical pipework, structural steelwork and large-diameter pipe systems for municipal and industrial water treatment infrastructure.
End-to-end mechanical and structural engineering for commercial developments and industrial facilities across Ireland and the UK.
Mechanical installation and structural steelwork for public sector and education infrastructure projects throughout Ireland.
Tell us about your requirements and one of our team will get back to you within 24 hours.

Ready to Discuss Your Project?