Window Companies in Pontardawe Get a Quote. Request a quote from Upvc Windows near you today with MPN Windows, Doors, and Conservatories, Our standards are high in every aspect of our organisation so when it comes to the client experience, we regularly get feedback complimenting us on how respectful the guys were on site, how clean and tidy they kept the site throughout the build, especially on completion and how keen they were to answer questions at every stage of the process.