Planning permission for an outrigger loft extension

[klove]

We're getting a loft extension and are end of terrace, so are only allowed 40 cubic metres leaving us with a pretty small room up there. Has anyone gone through full planning with Southwark to get an outrigger built? I get the impression it could be difficult but live in hope. Anyone got any experiences (positive or negative)?

[LondonMix]

I had an outrigger built in addition to the main loft room and ensuite under permitted development. 40 cubic meters will gave us an outrigger bedroom that was 110sft (so a decent double). We limited the height to 2.2 meters in both the main loft and the outrigger and that made it work. If you want really high ceilings in the dormer loft extension or have a really wide main house then it might be more difficult but its worth playing around with the parameters. Do you have an architect?

[klove]

Thanks for your reply Londonmix, we're hip to gable so 15 cubic metres are taken up with just sorting out the roof. Otherwise we'd be laughing as our outrigger is measuring 16 cubic metres.

Anyone else had any experiences?

[LondonMix]

Oh, that's too bad. One trick might be to put in two applications. From what my architect said, Southwark don't always approve / like outrigger extensions and so it's easier to get it via permitted development. Therefore, you could apply for the outrigger via permitted and the dormer / hip to gable via full planning. It would be hard for them to reject the hip to gable as it's got lots of precedent. Just don't take the piss with the size of everything and make sure you aren't harming your neighbours amenity. I've found Southwark to be reasonable.

We submitted 2 applications: pd for the loft, full planning for ground and first floor extension. All went through smoothly.

[Yak]

Similar experience to LM. We are nearing the end of a loft and outrigger extension under pd - I'm afraid we were a straightforward dormer for the main room (not hip to gable). Worth getting a few local architects in to take a look around and advise you on the options. I think Southwark are slowly having to come to terms with outriggers as that's a pretty much obvious use of the 40 sqm for terraces.