Flames coach Paul Dixon was delighted with his side after they beat Slough Jets to win the EPL Cup.
Having already won the the league against Sheffield last week, Guildford defeated the Jets 9-5 on aggregate to secure the double in consecutive years.
"To win back-to-back league titles for the first time ever and then to do it in the cup too is a great achievement," he told BBC Radio Surrey.
"It'll take a few days to sink in but I'm just delighted for the players."
He continued: "It's great for the sport that we sold out the arena with over 2,000 people for the cup final - our support never really falls below 1,900.
"We have huge expectations every season as one of the biggest teams in the league and the last two or three years has been hugely successfully, mainly because we've managed to keep our squad together."