I know of one couple who have added a huge extension on to their 1920s double fronted detached . . . They had four bedrooms but only one bathroom – growing family of teenagers meant it was all hell let loose of a morning. so an old barn type outhouse was incorporated into the plan to extend above the double length garage and then our the back to add a total of 1 master suite complete with ensuite upstairs, and two bedrooms with jack & jill bathroom and a large utility room with these all feeding off a wide extension to the existing kitchen and dining room. It is a fantastic new space. The owner worked well with his architect and between them they got theplans passed, after some give and take and resubissions. It pays to have a true professional amongst the team – they really do know their way around the building regulations and the planning authorities!