First thing you should know about Everest is that they are owned by a private equity firm: Better Capital, after going into administration in 2020, voiding all previous customer's warranties then opening up again under a different company name 'Everest 2020 Limited'. Private equity firms are essentially the leaches of the business world, they suck out every drop of profit for their shareholders, cut corners everywhere they can to maximise them profits and keep any investment at minimum or zero, until the company again goes bust. My mother had been an Everest customer for over 40 years, paying a shocking amount of money to have her home done in high quality aluminium double glazing, back in the 80’s when Everest actually earned the title 'fit the best' now it should be 'fit if you’re lucky'. We, now looking back at it, stupidly opted to go with Everest for a back door replacement, thinking it would be the same exceptional service, unfortunately as stated at the start of this post, the impact of being owned by a private equity firm is taking its toll, customer service is none existent, if you managed to get through to someone, they are hard faced, rude and brash. It's only when they want their money do, they suddenly become proactive (8 times they rang my 70yo mother in one day, from 4 different numbers with 2 voicemails and 3 text messages, chasing the final amount of just over £200 only a couple of hours after fitting) then there is the fitting.......Of course all the sales patter is very fast, quick and efficient. But once they get the bulk of your money, it's like Russian roulette, after waiting weeks for a door to be built, our installation date of the 21st Dec was brought forward to the 8th Dec, fab! we thought, the 8th arrived, ‘’oh no, won't be fitted today’’, installer hurt himself, disgruntled we rebooked for the 16th Dec, the 16th arrived, ‘’oh no, it won't be fitted today’’, installer is ill, by this time we are understandably fuming, one of the people in the ‘’Customer Relations’’ department, who we can’t name on here, treated my mother as complete dirt, obnoxious and very unhelpful, she simply made the matter worse, how she is allowed to deal with customers is anyone’s guess. Hope someone will at lease heed my warning and avoid the now lengthy problems and stress we have had to endure, Everest is not the company it used to be, and indeed it never will be, it's on a level with the likes of Safestyle UK, go small or independent for your windows and doors, Everest is proof that a long guarantee means nothing, so you might as well support a more deserving business, than feeding the private equity vultures.