Pitched vs flat roof side extension - ground floor flat

Apologies for the very late response. There are pros and cons to both the flat roof and pitch roof. I feel you leaning towards the pitch roof, so i'll play devils advocate and throw out a few positives for the flat roof. Flat roof positives: 1. Easier to build (marginally) 2. Cheaper to build 3. Easier to achieve an insulation value, and fewer issues with thermal bridging 4. Easy for services to run between the joists. 5. If you use a raised parapet on the flat roof you can contain all the water on the roof itself needing no guttering apart from at the garden end whereas with a pitched roof you need a gutter the full length and if you want to build to the boundary the gutters need to be boxed over the wall giving you some additional costs for lead flashing. 6.Finally the council will be unlikely to reject in privacy grounds particularly when you can do easily use tinted, mirrored or frosted glazing or even blinds at night in the roof lights. With all that there's nothing that beats a high vaulted ceiling and the sense of space and relaxation it brings. At the end of the end of the day it is your property and you will have to live there. You can always amend the planning application if it gets rejected. Every council is slightly different. Call or email us if you want to chat anymore.