Do I have to have a flat roof on my rear extension?

Which is the most-suitable extension to go with when adding to the ground floor?

A reader and her husband are debating which roof option to go with on their ground-floor extension: A flat or a pitched roof.

Hi Kieran,

We’re fortunate enough to own a home with enough garden to enable us to extend to the back now that our family is growing. We want to add a ground-floor extension, open up the kitchen to create the very popular kitchen/living/dining room and also a ground-floor bedroom with a bathroom to future-proof it. Architects seem to love flat-roof extensions or low-pitch membrane ones.