BlueSpud, thanks, its good to hear from someone who actually has a similar sized space. It might eventually be a teenagers room or we could convert the attic in the future and make it into a teenagers "hangout" room. Will definitely not plan on putting a double bed in there now though.
Sunnyday, I wish someone had advised us to consider letting the 1st floor overhang the side passage as you mentioned. Unfortunately none of the builders or engineers we met with suggested this and we could not justify a potentially 20K architect's fee when we saw limited options for our extension. Maybe this was a mistake?
Another concern would be that we know our neighbours plan a similar extension in a few years so if they also built up to the boundary wall we'd effectively be living in terraced housing which would surely affect property prices? Does anyone know if it would?
Extopia, we are converting and building over the garage and the stairs is on the other side of the wall so theres no way to make the room wider without building over the side passage.
Anyway, we have planning permission for our approx 7.5 ft wide extension now and unless we are convinced it will be totally useless its not worth going back to square one with the whole project. I just hope its worthwhile in the end though.
Would advise others to consider weight up pros and cons of getting an architect for extensions as I suspect in the long run their fee might have been worthwhile and might have saved us money and a lot of hassle.