Extensions

Planning 3m by 6.5m extension do I require permission and drawings

Anonymous user 28/02/2024 - 3.08 PM

I have recently purchased a home and planning to do a lot of work on it. One of them is to do a rear 3m by 6.5m extension. I have recieved quotes from builders and have some questions on what is best in terms of durability and cost. There is a lot of questions I have and decision on what is best - see below -Pitch roof Vs Flat roof (I wish to put sky lights in so wondering what is better) -Combination Boiler or Mega Flow - (see below) As I will be looking to put underfloor heating across the extension and also under the bathroom upstairs (around 30-35sqm) so wondering what system/boiler would be best. I have been advised a combi boiler may not be suitable to heat up this anount of space, but I am confused as I have a freind who has a Worcester Bosh comb boiler with 3 zones connected to thermostats, where one of the zones is for the underfloor heating. Also as its only rear single storey extension would I require drawings to be submitted to the council (Harrow council) with building controls submission? Also how much can I extend without planning permission? I have been quoted a price only for labour for the extension, and have been advised that I would be required to pay for all materials eg. bricks, tiles, cement, plumbing etc. Please can someone advise if this is normal builder practice