Boundary line.

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Hi everyone, I want to draw up plans for a single story at the rear and side of my house, it's a semi detached I think I have to leave either 50mm or 100mm gap from the centre line of the adjoining house, I can't find anything on the planning portal, I would be grateful if someone could enlighten me please, many thanks.
 
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If you leave a gap you are effectively giving away that area of land to your neighbour.

However, please also consider drainage, where your gutters will be, if they are overhanging into your neighbours land then that will be trespass and they will rightly be quite miffed!
If your wall is set back a bit it allows you to have a non trespassing gutter and any attempt by them to create lean to's etc. on the wall would be trespass on you. (I think)
 
Firstly - Talk to your neighbours…
Tell them of your plans and ask if they may consider doing something similar. If there is the slightest possibility ask if they would like to have a party wall agreement setup so hat you can build with the centre line of your wall on the boundary. They may be thinking doing something similar.

Has benefits for both; in the future no possible dirt and damp traps, neither party gains or looses and eases construction of future works. Only downside is that have some damage in their garden for a while.
 
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Thanks Woody and mattylad, I did plans for my garage nearly twenty years ago and remember having to leave 100mm which was for the gutter, that's why I'm probably coming from, many thanks to you both.
 
While we are on the subject, the property in question had a garage extension built a few years before I bought it in 2006, they had built about 6" over the boundary on my side (they also had the exhaust from the combi boiler straight through the wall) I used their wall and put the garage roof on it, she eventually moved to exhaust, probably cause her boiler kept shutting down due to me placing a bucket over it .
The wall which is single skin has been there about 15 years now, can I complain to the planning department or something?
 
Thanks wgt52, they have just moved in, I shall ask them first, so if they are having similar done and I build with a cavity would the middle of the cavity be the middle of the boundary or a party wall with a cavity both sides?
 
Another question, what is the cavity nowadays please, I built our extension nearly 20 years ago and it was 2" but have heard it has changed to 3"? I haven't worked on site since the late 90s and have mainly done refurbishing and the occasional garden wall.
 
Wall across boundary is not a planning issue, but a boundary issue now. Alternatively it has become a shared party wall,

Cavities tend to be 100mm full fill with quilt nowadays, or board insualtion with an air cavity.
 
100mm! Good grief! That's 12" walls! There won't be any room left to swing a cat!
 
Take the boundary line and then go 2" either side and build the internal walls for both properties.
 
Oh, raise a shared party wall then going through the PW Act, and obtain planning permission for building on neighbouring land?
 
Consider building the face of the brickwork on the boundary if possible/suitable depending on design (e.g. without overhanging eaves and designed without gutter to that side).

Whilst your neighbour has the right under the party wall act to enclose the wall and use the wall they will have to reimburse you for 50% for cost of building the wall when they do so and pay any surveyors fees - my understanding is even if they build a new wall but enclose yours they are still liable.

If you think they may do something in future I would consider trying and agree to build centered on the boundary line. If they are friendly and agreeable you can probably do the paperwork yourself and you both win a bit of space internally and they will avoid a load of surveyors fees in the future.

If you have a gutter and eaves and leave a 100mm gap and then your neighbour does the same and you will have problems with maintenance.
 

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