S,
What kind of specs did you provide? The quotes are substantially different so it's hard to compare them fairly. If you're concerned about price you can tell them each to bid a price for a given size with 2-3 options. Also, don't forget to compare their contract terms for things like:
- Completeness. Who removes debris, underground hidden conditions, permits, release of liens forms etc.
- Your obligations
- Warranty
- Reference reports
- Payment terms
- Performance test
These are only a few items but they can be as important to a successful project than any of the other items. One of the worst ways to choose is to go with "the one we seemed to work with well". That often changes after the contract is signed. Look around on this site and you will find horror stories that result when the contracting side is ignored. It's not hard to do this part right. Just takes a little effort and can be huge in making the right choice.
One last thing on the crazy supply chain world we live in. Commodity prices for everything are going through the roof with no end in sight. It calmed down a little a few months ago but everything is ramping up again now. I would consider locking in the expensive items as soon as possible with your contractor. This requires a different kind of contract than most commonly used. The only way a contractor can give you a lump sum is to guess the highest price for each item so he doesn't lose money. I'm finding success with this approach on my OB house and pool project right now. I ordered concrete 2 months ago, block 3 months ago, and trusses 4 months ago. I delayed for a year to wait 'till supply commitments could be firm. Now you can get them but they are often only valid for 14 days or less. If you don't lock in materials separate from labor, overhead, profit the price will be higher than you need to pay or even worse the builder will get in trouble during your build.
I wish I had better news for you and I hope this is helpful.
Chris
PS I see no change to this craziness for at least 2-3 years. Below is copper graphs. You can find similar information on all commodities used in construction and they look similar.
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