How do I know if the current foundations are sufficient
We’re buying a house where the Current owners did an extension in 2021. Planning granted for two storey side extension but they only built the ground floor. (There’s a picture of the upstairs plan on the listing) One of the enquiries we’ve raised is ‘are the foundations sufficient to build above the current extension’ and they’ve come back with a bit of an arsy reply basically saying they don’t know.
I have no experience of extensions whatsoever.
Can anybody with knowledge on this tell me. If we are being unreasonable asking for this.
The building regs completion cert they provided is for a single storey extension so how am I to know if the foundations were signed off as single story or double story foundations.
They seem to have skimped and scraped a bit by the looks of it so I’m naturally worried if they did this one properly.
What proof can we ask for?