DIY Doctor UK DIY Forums

Hello...this is my first post.

I have a end terrace house which currently has a 3 meter rear extension...I have contacted the local authority and asked them if I would be able to extend it another 3 meters to make it a full 6 meter rear extension...the LA advised I could and this would fall into permitted development if carried out by March (or so) 2019.

What I would like to know is...is it possible to extend an existing extension without demolishing it and starting again? ...I just want to make the the rear extension longer...currently it has a flat roof and I would prefer to have either a pitched roof with skylights with a flat roof with lanterns.

...would it be the case of knocking down the rear wall/windows and just extending on from the current structure? ...any help would be appreciated so I can plan for the build and factor in the costs etc.

Property is in London.

Thank you.

if you posted more details perhaps i may be able to help, remember you're
probably only going do this once so think about maximising the project
i've got plans and a project management spreadsheet for period terraced rebuild

Yes, it is possible to extend like you said but it would be advisable to take professional building contractor's help or an architect. As for building extensions, you will need a party wall agreement if you have a neighbouring wall attached to your property.