Min distance between dormer cheeks?

5 Apr 2012
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United Kingdom
Our neighbours have a loft dormer (10 years old), with the cheek sitting 20cm (1 tile width) away from the middle of the party wall.

We now want to convert our loft but were wondering how close we can practically go to their dormer? We were thinking 20cm in from centre of party wall (same as theirs), giving a 40cm, but do you think this would be enough space to tile and maintain the cheeks? If we leave a bigger gap it creates an almightly headache with stair location/headroom.

Any thoughts would be welcomed.
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Just for extra info, the neighbours won't consider any suggestion of joining the dormers.
You can rip off the side of their dormer, build a proper party wall, and then build your dormer up against that. Might be nice to let them know first. Oh, and establish a Party Wall award.
You can go as close as getting your hand in to seal and dress the flashing.
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Cant join them as they are just off of the party wall. Getting a hand in is one thing, but how much space to fix and repair a tile do you think we would need? 400mm, 600mm?
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Why would you ever need to repair a tile? What would happen to it.

I'd design it without tiles and pre-form it before fixing it in place.
I had the same problem, in the end we went close and sealed around, Bottom line they cannot access their tiles now.

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