Sky Fibre Max subscribers will be allowed to claim money back in their first 30 days if their Hub fails to deliver the promised speeds.
The Sky Fibre Max product is being advertised as offering download speeds of 55Mbps, but the provider wants to hold itself to account by offering a Speed Guarantee.
This means that if a customer's download speed falls short of the promised level, they will be able to ask for a refund within 30 days of activation.
Subscribers will also be given the option of switching to the next best fibre product at no extra cost, which means they will pay less per month on their contract.
Alternatively, people can choose to cancel their broadband and talk contract without paying early termination charges.
Speed checks must be carried out using sky.com/mybroadband, as data from third party speed checkers will not be accepted.
"Sky has become the first UK internet service provider to introduce a superfast Speed Guarantee, available to new customers taking Sky Fibre Max," the company said.
The company went on to state this is one of several "great features" available to Sky Broadband customers at no extra cost.
For instance, it said subscribers have free access to Sky Talk Shield - a call screening service that lets people block nuisance calls and only answer the calls they want.
In addition, Sky stated its Broadband Shield is available to customers and gives them control over their household's online experience, as well as protects them against malware-infected sites and phishing.
Sky added that its Broadband Tech Team are on hand to resolve most issues online and will visit customers' homes if it is required.