Black & White Engineering’s acquisition of Homan O’Brien is in line with a strategy to expand its global presence, particularly in the data centre and infrastructure sectors.
This is Black & White’s first acquisition since Waterland Private Equity bought into the firm in June 2024.
Homan O’Brien was established in 1990 through the merger of Robert Jacob & Partners (founded in 1955) and Seamus Homan Associates (founded in 1978). It specialises in mechanical and electrical engineering design services. It operates across various sectors, including data centres, healthcare, education, laboratories, commercial, residential and industrial facilities.
Black & White Engineering chief executive Mick Cairns, who founded his business in 2014, said: “We’re incredibly proud to welcome Homan O’Brien to Black & White Engineering, a business that shares our values and drive for excellence. Dublin’s strategic role in the global data centre market makes it the ideal location for strengthening ties with our clients, and establishing a regional headquarters in Ireland is a significant step in our growth journey. Homan O’ Brien’s strong local presence and specialist expertise align perfectly with our ambitions, and I’m thrilled to bring such talented people into our global team. It’s a great fit that unlocks new momentum as we continue to expand internationally.”
Black & White Engineering operates across 18 cities worldwide with more than 700 employees. In 2023 it turned over £31m.
Homan O’Brien managing director Simon O’Brien said: “This is an exciting next step for our business. We remain committed to our clients and the team we have built, while gaining the scale and support of being part of Black & White to accelerate our growth and deliver more for our staff and clients.”
His co-managing director Brian Homan retired from Homan O’ Brien on 30th April 2025.
Waterland (UK) partner Wendy McMillan said: “We are delighted to support Black & White Engineering as it continues to grow, expanding its capabilities and international footprint. The partnership with Homan O’Brien is a strong strategic fit bringing together complementary expertise, regional strength and a shared focus on technical excellence.”
The two businesses will begin working together immediately, with future plans to scale and expand the team in Ireland.
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