Roof overhang on party wall?

[Wild Angel]

Hi, I'm having some issues with my neighbour about an extension we're planning and could do with some help. I hope I'm posting this in the right place, if not feel free to move it.

We are in a link attached property and are planning an over garage extension, building up the shared wall with the neighbour to the full height of the property.

The neighbour's issue is that the roof tiles will overhang this party wall by about 4cm into his air space. The architect says there must be an overhang so the rain drips off, not down the wall, that that is just how it is done and there isn't another way. At least a dozen properties on my estate have had this extension and none of their neighbours brought up this problem.

I can see the neighbour's point that it is encroachment, but if we're building up the party wall, what else can be done? I've seen discussions about gutters and dormers but nothing about this specific issue.

I don't really understand why the neighbour is so concerned about this. We have told him that it won't affect his ability to build a similar extension (in fact it will help, as the central wall will already be built up). Any help would be much appreciated.

 

[freddiemercurystwin]

It's not encroaching it's trespass, you cannot overhang the boundary at all, your neighbour is quite right and well within his rights to expect you to not build over the boundary. Furthermore it won't be 4cm there will need to be a gutter too. The fact that it might make his future extension easier is neither here nor there, if he doesn't want an extension it's completely irrelevant. The architect needs to get clued up and needs to find another way, either that or he just can't be bothered to draw up something a bit more complicated than a standard eaves detail and he should know very well (I bet he does) that you cannot build beyond the boundary.

Typically the solution is an inbound gutter eg

Box Gutter and roof trusses

Looks like your designer has drawn plain tiles too. Can't happen with a 32 degree pitch.

www.diynot.com

Boundry Gutter method

Hi, Wondering if someone can help me with a gutter situation. I have a cavity wall on a kitchen extension, and the outer wall is on the boundary and I don't wish the gutter to overhang into the neighbours land. I've seen box butter but these are when there is a parapet wall, the external wall...

www.diynot.com

 

[Wild Angel]

It doesn't need gutters as it's a gable end. There's no gutters on that side of the house currently. The gutters are on the front and back of the house, not the sides.

If it is not possible, how have the other people on my estate been able to do it with no problems? I don't understand.

Do others agree that the architect is in the wrong? If so, I'll take it up with him more firmly.

 

[freddiemercurystwin]

OK, that would have been helpful to know! Got a photo? I suspect the neighbours who have had adjacent extensions are not very astute!

 

[Wild Angel]

Also, any suggestions on what we could do instead of a slight overhang would be gratefully received.

 

[catlad]

How can you be building up a party wall? will you not be opening up your neighbours roof?

 

[Wild Angel]

Yes, just slightly, it is his garage roof, the garages are attached. He doesn't seem to have a problem with that part of it.

No pictures I'm afraid, I'll take one when it gets light. I have elevation pdfs but I don't think I can attach them here.

 

[Wild Angel]

Deleted this post as turned out to be inaccurate

 

[Wild Angel]

Thanks for the help. I talked to my architect today and we're going to change things so there is no trespass