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 McQuillan Companies is one of Northern Ireland’s leading providers of environmental, construction, and outdoor maintenance services. With a legacy spanning over 120 years, the company has grown from its origins in quarrying to become a multi-disciplinary business committed to innovation, sustainability, and community impact. McQuillan’s mission is to deliver reliable, high-quality services that support infrastructure, environmental protection, and the wellbeing of the communities it serves. 

McQuillan Companies is a family-owned business with deep roots in Northern Ireland. Built on a foundation of trust, hard work, and long-standing client relationships, we pride ourselves on being a progressive employer and responsible corporate citizen. Our team is made up of experienced professionals, skilled tradespeople, and emerging talent — all united by shared values of safety, integrity, and excellence.

As a modern, forward-thinking business, we’re dedicated to continuous improvement, employee wellbeing, and the promotion of sustainable practices across all areas of our operations.

McQuillan Companies operates across several key divisions:

·         Construction & Civil Engineering
From roads and car parks to large-scale infrastructure projects, our construction division delivers safe, efficient, and high-quality surfacing and civil engineering solutions across the UK and Ireland.

·         Quarrying & Aggregate Supply
With a heritage in quarrying, we continue to produce and supply high-grade aggregates and bituminous materials, supporting both internal projects and the wider construction industry.

·         Environmental Services
We provide essential waste management, recycling, and environmental consultancy services. Our advanced facilities handle a wide range of commercial and industrial waste streams, helping clients meet sustainability targets and regulatory compliance.

·         Outdoor Maintenance
Our McQuillan Outdoor division offers year-round services including grounds maintenance, landscaping, flood prevention, outdoor cleaning, and winter gritting — helping keep public and private spaces safe, clean, and operational in all seasons.

Benefits may include depending on job role the following:

• Competitive salaries
• An employee health scheme
• Employee private healthcare
• An excellent employee pension scheme
• 31 days of annual leave, increased in line with years of service milestones
• Working as a part of a dynamic group of professionals who excel at maintaining regulatory standards while fostering a supportive and welcoming environment
• Excellent development, learning and training opportunities
• Participation in a range of team building activities