Ofcom, however, said consumers would be protected from high prices.
Openreach’s chief executive Clive Selley said: “Today’s regulation will allow us to ramp up to three million premises per year providing vital next-generation connectivity for homes and business right across the UK.”
As part of the measures, Ofcom will effectively freeze the wholesale fees Openreach charges for providing “superfast” data speeds of up to 40 megabits per second, which rely on copper links via fibre to the cabinet (FTTC) or older technologies.
The watchdog had previously forced these to fall by about 20 percent over recent years.
The price Openreach charges for faster and more reliable FTTP connections will remain unregulated, but it will not be allowed to offer geographic discounts on its full-fibre wholesale services.