May I draw your attention to an important Uretek experience on another forum? Link and content pasted below.  

It is also my understanding that with chemical underpinning such as this that clients need to get a firm MATERIALS quote upfront like I did with a mob in Adelaide called Urathane Solutions Pty. Ltd. who guarantee all clients that there will be no further material cost, and that Urathane Solutions totally covers any excess cost themselves, should it happen.  My understanding is that quotations from Uretek can vary significantly for materials once the job is in process, and come as an unpleasant surprise.So make sure your quote for materials for underpinning is fixed whoever your contractor is.

http://www.notgoodenough.org/viewtopic.php?p=317788#317788

<moderator: I have deleted the content.  Please see link if you are interested>