John Sisk & Son profit 2025 reached £7.2m pre-tax, a rise of more than 20 per cent on the £6m recorded the year before, as the Dublin-headquartered contractor pushed its annual turnover past £700m for the first time in these accounts.
Accounts for the year ending 31 December 2025 show turnover climbing from £624.9m to £704m, reflecting what the company described as strong underlying performances from several large-scale residential, civil engineering and commercial projects. The result was tempered, however, by adverse outcomes on a small number of loss-making schemes and by provisions set aside to address remediation costs relating to a small number of legacy issues.
Interest income drives the pre-tax improvement in John Sisk & Son profit 2025
The headline profit movement was largely driven by interest income, which grew from £153,000 to £1m across the year. Operating profit also improved, rising by £396,000 to £6.2m. Cash at bank strengthened to £57.4m from £48.7m, and the directors neither recommended nor paid a dividend during the period, consistent with the approach taken in 2024.
Employee numbers edged down marginally, from 767 to 765, while the total wage bill rose to £58m from £55.6m. The company added that it carries a strong order book for 2026, with what it described as a good line of sight into 2027.
Those project wins give substance to that forward visibility. Last month, Sisk was appointed to redevelop the London Irish Centre in Camden under a contract worth up to £38m, with construction due to start in January 2027. In June, the contractor was appointed to deliver a £280m housing scheme at Battersea Power Station in south London, completing a further stage of the 42-acre mixed-use development. Earlier in the year, Sisk won a £42m contract to redevelop Edgbaston Stadium in Birmingham, with that work due to finish ahead of the Men’s Ashes in summer 2027.
Homes England relationship and the wider group picture
Research published by Construction News earlier in August showed that during 2025/26, Sisk was the top site preparation and infrastructure contractor for Homes England for the eighth consecutive year. Figures obtained under the Freedom of Information Act showed the firm received almost 70 per cent of the agency’s total spend on such works, taking £48.2m out of a total of £69.7m in direct cash to construction companies during the period.
That domestic standing sits within a significantly larger group context. According to the Sisk official website, the Group reported revenues surpassing €2.75 billion in 2024, underscoring the scale of operations behind the UK entity’s individual accounts. Last year, Sisk also acquired Farrans, which continues to operate as a standalone entity within the group.
Founded in 1859, according to DroneDeploy, Sisk brings more than 165 years of contracting history to a UK pipeline that now spans large residential developments, civil infrastructure and complex heritage and stadium projects. The breadth of that portfolio is precisely what makes the 2025 accounts a layered read: headline profit growth delivered despite provisions on legacy remediation issues, with interest income doing proportionally heavy lifting on the pre-tax line rather than a step change in operating margin.
For the sector, the accounts illustrate a pattern familiar to contractors working at scale across mixed project types: strong performances on marquee schemes can be offset by tail risk on a small number of contracts, and remediation provisions on legacy work remain a live cost in any given reporting period. The company’s growing cash position and stated order-book confidence point to further volume in 2026, with the Battersea Power Station housing scheme and the London Irish Centre redevelopment both set to move into active construction phases over the coming months.
