Carport Underpinned but walls not jacked up

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Hello everyone, i'm new to this but here goes. I've a three bed semi which had a side extension built which was a carport with an extra bedroom and bathroom above the carport. This was built before i had the property. About 6 years ago through the insurance i had the car port extension underpinned due to subsidence using a mini piles system. This has stabilised the extension but recently i bricked up the front of the extension and maybe in the future plan to convert the car port into a living area. But now it is obvious to see that when the car port was underpinned that the walls weren't jacked up and it is obvious to see that they have dropped by approx 2". The question i've got is how easy is it to jack up the wall and secondly what are the sort of costs for doing this. Thanks for any assistance
 
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Hi,

This has stabilised the extension --- But now it is obvious to see that when the car port was underpinned that the walls weren't jacked up and it is obvious to see that they have dropped by approx 2" --- do you mean that the floor slab has not dropped but the walls have?

When a property is underpinned it is usual to stop the building subsiding further rather than to 'jack it up'.
If you wish to 'jack up' a wall then you would first have to build a solid platform to be able to 'jack off'.
This would involve building a series of concrete bases to act as a platform and these bases would have to be dug to a depth where sufficient good ground with enough loading capacity is found.
Please also note that where piling occurs rather than traditional type underpinning (concrete bases supporting the foundations) it is usually because the ground does not offer sufficient loading capacity.
Piling can be bored to find good ground at much greater depths than traditional type excavation and mass-concrete fill.

If your underpinning was carried out via your insurers then you should have a warranty on the works, of at least 10years --- if you have an ASUC (Association of Specialist Underpinning Contractors) warranty then this should be for 12years.

I would get in touch with your insurers or the warranty provider asap.

Hope this helps.

sqidd1g
 

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