Top 100 Construction Companies in the UK for 2026

Overview of the UK Construction Landscape in 2026

As of August 2026, the UK construction industry is witnessing significant developments, with Mears Group emerging as the top construction company. This ranking is based on data from Glenigan's comprehensive construction activity database. Mears Group's recent success includes securing a substantial £290 million housing improvement contract, highlighting its pivotal role in the sector.

Notable Players in the Industry

The construction landscape is diverse, with several key players making substantial contributions:

• Balfour Beatty: With annual revenues around £10 billion, Balfour Beatty employs over 26,000 individuals and is a major contractor in the UK.
• Morgan Sindall Group: This company reported revenues of approximately £4.5 billion, underscoring its significant market presence.
• Kier Group: Known for its focus on public sector infrastructure projects, Kier Group is also recognised for employee satisfaction, ranking as the highest contractor on Glassdoor's Best Places to Work list for 2026.
• Keller: Specialising in geotechnical engineering and ground improvement services, Keller plays a crucial role in foundational projects.
• Amey UK: Providing essential public infrastructure services, Amey UK is involved in highways maintenance and rail operations.
• ISG: This company focuses on fit-out and construction services, particularly in the commercial and healthcare sectors.

Employee Satisfaction and Recognition

Employee satisfaction is a vital aspect of the construction industry, and several companies have been recognised for their efforts in this area:

• Kier Group: Not only is it a leader in revenue, but it also ranks 27th overall on Glassdoor's Best Places to Work list for 2026.
• Gleeds: This company was acknowledged in the Great Place to Work UK Best Workplaces for Development 2026, with 81% of its staff feeling they received necessary training and development, an increase from 76% the previous year.
• Gilbert-Ash: Recognised in the Sunday Times for its employee engagement, wellbeing, and job satisfaction in 2026, Gilbert-Ash is noted for its positive workplace culture.
• Kori Construction: Also featured in the Sunday Times Best Places to Work 2026, Kori Construction is gaining recognition for its employee satisfaction initiatives.

Conclusion

The UK construction industry in 2026 is characterised by strong competition and a focus on employee wellbeing. Companies like Mears Group, Balfour Beatty, and Kier Group are not only leading in revenue but also prioritising their workforce's satisfaction and development. As the industry continues to evolve, these companies are setting benchmarks for success and employee engagement.