Customers of Roofer and Builder in Liverpool have expressed high satisfaction with the services provided by John, Carla, and their team. They have praised the team for their professionalism, tidiness, and high-quality workmanship in various projects including Velux sun tunnels installation, roof repairs, and first-floor extensions. The team's ability to complete jobs within realistic timeframes and their polite demeanor have also been highlighted. Overall, customers have reported positive experiences and have recommended the company for future projects.