Foundations on original side extension?

[SimonHills]

Hi. My house was built 12 years ago. It's a two story house (with a small single story side extension 3.5m x 2.5m attached to the main house) built with the original house by the builders. I didn't buy the house when it was built, I bought it off original owners, 4 years ago. 

 

What's the likelihood that the side extension has the same depth of foundations as the main house?  How could I go about finding this out, where would this info likely be held? Were there any regs that saying it should have the same depth when built etc....asking because I'm considering adding a second story.

 

Thanks for any help in advance.

Edited Friday at 20:33 by SimonHills

[Conor]

Likely the same but you'd need to dig a small trial hole at one side to expose the footings. No other way of knowing. 

 

What are you planning on doing?

[SimonHills]

Thanks, want add a second story on top of single story side extension

[Russell griffiths]

As Conner said, nothing on council records will be excepted without trial holes showing what exactly is there. 

[nod]

You definitely need to bring in a Structural Engineer 

[Mr Punter]

There is rarely any difference in foundation depth between single and two storey but only a couple of trial holes will tell.