Milk supplier Robert Wiseman has warned the cost of its new dairy in Somerset is likely to rise to �80m from �60m. It blamed the increase on rising construction costs and its decision to increase capacity at the site from 300m to 500m litres a year.
The Scottish firm is pinning its hopes on the increased profitability it can achieve with the extra milk produced.
The news came as the company unveiled a 29.4% rise in pre-tax profits to �34.6m for the year to the end of March.
Wiseman said the Somerset dairy was on track to begin operations in December.
The dairy group also welcomed initiatives from supermarket chains such as Tesco and Sainsbury to increase the amount they pay for milk.