New extension

[Bishee1999]

Hi

Thinking of having a new extension built in a mid terraced house.

Both neighbours have extensions.
My question is im thinking of having full 4metre projection width of the house. What are the regulations building walls next to neighbours extensions. Can i use their walls, cavity and inner wall or do i need to leave a gap and start our wall?

 

[noseall]

The PWA was invented for terraced housing and you will likely need to involve this piece of legislature as part of your design process.

The very fact that your neighbours have extensions could mean that their foundations already interfere with your proposals.

However, if maximising space is not an issue then you can build your new walls well within your own boundary without having any party wall headaches.

Woodshake will be along with a proper answer shortly.......

 

[^woody^]

If you use the neighbours walls, you will need planning permission to do so, a party wall agreement, and express consent from the neighbours - normally formalised into the property deeds

If the existing walls are already on the boundary and so existing party walls, then you can use them with just a party wall agreement

Various building regs will apply depending on design

 

[luisdesign]

You should have a read through the Party Wall Act explanatory booklet HERE

This will hopefully help explain what you may or may not be able to do. As you live in a mid terraced house you will need to apply for Planning Permission for an extension longer than 3m. It is unlikely you will be allowed to build an extension longer than your neighbours but full advise is difficult without knowing more about your property.

As already mentioned, if the existing walls are already Party Walls then you may be able to use them, though you will be required to pay the neighbours half of the cost of the construction of the wall (in todays terms).

When building a new wall next to existing walls you will usually risk undermining existing foundations and the Building Control Inspector will probably want to see foundation details / underpinning plans.