It depends on the material you use, but if your flat roof is installed correctly it should last for at least 10 years, and at least 20 if a material other than felt is used. Always question a roofing company when they quote to find out what materials they use and what guarantee's they offer.
South Croydon is an area in Greater London, one mile to the south of central Croydon, accompanied by a populace of 70,000. It is a part of the Surrey County plus helps to create the Borough of Croydon, with which it shares its name. Having a range of householders needing enhancements to their home in the South Croydon region, be sure to exclusively use vetted companies to get very good value for money by contrasting quotations.