IN Brief:
- JN Bentley increased pre tax profit to £26m on revenue of £534m during 2025.
- The contractor enters AMP8 with a £604m secured order book through Mott MacDonald Bentley.
- Specialist labour, workload planning, geographic capacity, and supply chain finance could constrain delivery.
JN Bentley has warned that the scale of the AMP8 water investment programme could create labour shortages and specialist capacity constraints as projects move from mobilisation into full construction.
The Mott MacDonald owned contractor issued the warning after reporting one of its strongest recent trading performances. Pre tax profit increased by more than one third to £26m for the year ending December 2025, while revenue rose by 5% to £534m.
Operating margin improved from 3.7% to 4.8%, while the workforce increased by 9% to 2,216 employees. Year end cash rose to £48m, giving the business greater capacity to invest in recruitment, training, equipment, and project mobilisation.
JN Bentley has secured AMP8 work with South West Water, Wessex Water, and Scottish Water. Its integrated Mott MacDonald Bentley operation entered 2026 with a £604m order book, compared with £552m a year earlier.
Revenue growth is expected to remain modest during 2026 because water companies are introducing their programmes gradually. Activity should accelerate as design, approval, procurement, enabling, and main construction packages move through the five year cycle.
AMP8 is approximately twice the size of AMP7, with investment directed towards treatment works, reservoirs, pipelines, sewerage networks, storm overflow reduction, leakage, environmental improvement, resilience, and maintenance of existing assets.
The programme presents substantial opportunity for civil engineering and process contractors, although delivery capacity is unevenly distributed. Certain disciplines, asset types, and regions depend on specialist teams whose numbers cannot be increased quickly without affecting competence, supervision, productivity, and quality.
JN Bentley has identified talent and delivery capacity among its principal strategic risks. The company expects higher workloads to require careful allocation of people and projects so that rapid growth does not weaken margin or operational control.
Methods and programme control will shape output
Water companies are increasingly using repeatable methods and specialist equipment to raise output without relying entirely on additional labour. Severn Trent, for example, is deploying Tracto pipe bursting equipment across AMP8 renewals, reducing excavation where asset condition, alignment, and ground conditions support trenchless replacement.
Comparable productivity gains will be required across treatment, network, and environmental work. Standard designs, modular process equipment, digital asset records, off site manufacture, and programme level procurement can reduce the amount of bespoke engineering repeated across similar projects.
Water infrastructure remains highly dependent on local conditions, however, because treatment assets must continue operating, buried networks run through congested streets, and environmental permits can determine when particular activities are allowed. Standardisation must therefore be combined with a detailed understanding of each live asset.
The labour requirement extends beyond site operatives. AMP8 will require designers, process engineers, commissioning specialists, planners, quantity surveyors, project managers, supervisors, electrical engineers, control system specialists, and environmental professionals, many of whom are also being recruited by energy, transport, nuclear, and other infrastructure programmes.
Competition between sectors can increase salaries, subcontract prices, and staff turnover, particularly where several major programmes are advancing in the same region. Contractors may hold a strong order book but still struggle to convert it into margin if experienced teams become more expensive or unavailable.
Financial resilience among smaller contractors and specialist suppliers will require equally close attention. Businesses may be asked to expand rapidly while funding labour, equipment, materials, and working capital before payment is received, creating strain even where the underlying order book appears healthy.
Framework clients and principal contractors will need to assess whether delivery partners possess the management capacity and balance sheet strength to support the workload allocated to them. Spreading packages too thinly can reduce accountability, while concentrating too much work with one supplier can create dependence and capacity risk.
JN Bentley’s stronger cash position and improved margin provide a firmer base for investment. Its workforce growth during 2025 suggests that preparation is already under way, although recruitment will have to remain aligned with the actual release of projects rather than headline programme value.
The £604m order book provides visibility, but backlog quality will be determined by programme sequencing, risk allocation, inflation provisions, design maturity, access, and the readiness of clients to issue work. Secured value produces little operational benefit when projects remain delayed in approval or preconstruction.
Water companies face intense regulatory and public pressure to produce measurable improvement. Investment will ultimately be assessed through completed treatment capacity, reduced leakage, lower pollution, greater resilience, and functioning assets rather than the number or value of frameworks awarded.
JN Bentley enters AMP8 with more profit, cash, employees, and secured work than it held a year earlier. Preserving those gains as activity accelerates will depend on disciplined project selection, realistic resourcing, dependable supply chain capacity, and construction methods capable of increasing output without weakening safety or technical performance.
