WiFi extension or booster for annex

[NikiW49]

I have recently had sky broadband installed, however we have an annexe and we are unable to get the WiFi in there. I cannot see online any options to purchase boosters just what types you have. Am I able to get one to help with the signal? Or would an engineer have to come out to extend some how? 
Thanks

[TimmyBGood]

@NikiW49 

Sky loans wireless booster hardware free under the terms of the 'WiFi Guarantee' element of the legacy 'Broadband Boost' add-on and the 'Enhanced Wall to Wall WiFi Guarantee' part of the 'WiFi Max' subscription supplement: they don't otherwise provide or sell boosters except to resolve issues with Sky Q. Phoning Sky to go through a telephone diagnosis is required to have a booster or pod allocated to the account. Inevitably some  Sky booster hardware has leaked onto a certain auction site and elsewhere online, but Sky won't offer support with using these. 

Confusingly the default 'Wall to Wall WiFi Guarantee' bundled with all new Sky Broadband orders where Boost or Max is not added by the customer doesn't actually provide booster hardware, and is essentially a sales lead generator for the supplements mentioned above plus a one month broadband subscription refund.

[NikiW49]

Thank you for replying.

I'll give them a call at some point then 

Thanks ☺️