Top 100 UK construction companies: what is their position on the UK market

Company Watch has prepared a list of the 100 best and largest construction companies in the United Kingdom. This year’s review of the UK’s Top 100 contractors is based on the analysis of the companies’ financial results submitted by the end of June 2025. So, which companies are considered the biggest and best in the UK, and what are their key indicators?

The main source: Top 100 construction companies 2025

Which are the best companies in the UK building industry?

A quick look at the main players reveals few surprises: Balfour Beatty returns to its usual first place (last year it was pushed to second by Morgan Sindall), while the usual suspects – Kier, Wates, Laing O’Rourke, Mace, and others – remain at the top of the table.

However, one very obvious difference is the absence of ISG, the industry’s loudest collapse of 2024. Last year, ISG held fourth place in the Top 100 table. Excluding ISG, this year’s table shows an overall improvement in the financial performance of the top 100.

What is the state of the construction industry?

The combined turnover reached £76.5bn, which is 7.3% higher than in the previous financial year for the Top 100. Total profit is also strengthening. The combined profit in the latest Top 100 list increased by 57% to just over £1.9bn, as contractors acknowledged the old business saying: “Turnover is vanity, but profit is sanity.” Turnover grew in 69 out of the Top 100 companies – fewer than 78 last year – but pre-tax profit increased in 68 companies this year, compared to 51 in 2024. As a result, profitability, calculated as the ratio of profit to turnover, increased. The average pre-tax margin for the Top 100 rose to 2.4% from 1.9% for the same group in the previous year.

Fencyx, as one of the leaders in the UK building industry, positively evaluates this report. We are glad that despite all the challenges, the construction sector demonstrates stability and sustainable growth.