Neighbour wants to build a common extension wall - any issues?

[^woody^]

"Trespass buffer zone"? Is it that bad up there?

 

[Tgeorge]

Several points:
1. get a written agreement.
2. get it in writing that the neighbour building the wall will defer your 50% contribution to the new party wall permanently.
3. I would extend the party wall up with a parapet wall so you will not need to disturb the neighbours flat roof when you build your extension.
4. make sure the new party wall is built as a separating wall with full sound insulation compliance NOT just an external wall. There is a slight difference.

Very helpful - many thanks wessex101. All points noted and I will discuss accordingly with the neighbour. If possible, could you explain the 3rd point about the parapet wall a bit more so I can explain to my neighbour? I am not able to visualise it.

 

[sxturbo]

Something a little similar to this, but obvs the neighbours will have a flat roof,

You will need to make sure the architect details the parapet wall correctly for later adaptation to your extension

 

[Tgeorge]

Something a little similar to this, but obvs the neighbours will have a flat roof,

You will need to make sure the architect details the parapet wall correctly for later adaptation to your extension

View attachment 235812

Many thanks, that's great. Probably even easier with a flat roof. The parapet wall also allows us to go up a storey if needed I guess.

This combined with a 20cm or 30cm short stub of foundation with exposed rebars turning into our garden and some anchors in the wall should hopefully allow us to stitch up the foundation and tie the walls in future.

Just need to ensure I get the written agreements in place.

 

[johnny2007]

Whatever happens, try to avoid anything that would leave a tiny gap (under 500mm) between their extension and yours.
Having them attached is ideal, but some builders like to take money and run, so they leave a non accessible gap between builds and after a few years, rubbish will inevitably make the walls damp.
Plastic bags are the main problem.
You can't imagine how bad it gets.

 

[noseall]

Is it that bad up there?

Only if Brummies keep on migrating here.

 

[SpecialK]

No way to build both extensions at the same time?

 

[^woody^]

Only if Brummies keep on migrating here.

We are the 'sharing is caring' types when it comes to boundaries.