Cheap injection underpinning; too good to be true?

I am renovating a house that already has an extension on one side. The extension has a slab floor over clay sub-soil and it has subsided and moved about 10mm since it was constructed 30 years ago. I rang several companies about a structural inspection and one place said they could do a report for $1540 (seems about right) and chemical injection for $4180 - including the report.

The price is much lower than other forum members have mentioned ($7K to $10K) and they gave me the price over the phone without seeing the extent of the problem. I'd like to save some money, but this offer sounds a bit suspicious - how would I know if they are ripping me off with a temporary fix or a shoddy product? Do structural engineering companies have licensing I can check? Would customer referrals be worth asking for?


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