Broadband customers stand to benefit from new rules proposed by Ofcom, which would require Openreach to carry out line repairs and installations in a shorter timeframe.
Under the plans, BT's network infrastructure division - which installs and manages broadband lines - will be required to meet new minimum performance standards.
Should it fail to meet the new targets over a 12-month period, Openreach would face sanctions from Ofcom - which could include fines.
The requirements would see the majority of consumers and businesses encountering a broadband fault receive a repair within two working days.
And those requiring a new line from Openreach would see it installed within 12 working days.
Ofcom is proposing the new requirements must be met in full from April 2016 - with Openreach required to complete at least 80 per cent of works within the set timeframe.
The media regulator is set to announce its final decisions in the spring.