Not quite the same thing.
I had the roof of my 1400 square foot rectangular house redone about 8 years ago, including:
11 sheets of plywood (the roof was bad!)
New glass skylight to replace the old plastic one
New mushroom-shaped motorized roof vent
New ridge vent
All new shingles etc from the plywood up
This cost me $5600 for materials and labor. I hired a very hard working and economical Pennsylvania Dutch crew who were clearly old order, though I don’t know if Amish or Mennonite or one of the branches of Brethren.
Last year in Texas I had the roof replaced on a two story 2,000 sq. ft. house with Owens Corning shingles for $9,300. This includes replacing about 4 pieces of decking, replacing all the vents, and doing a little fascia board fixing.
On the first day of your install, some guys with a conveyor belt truck come and put piles of shingles on your roof. On the second day, a big crew of guys come and do the tear off and roofing in one day. On the third day, the boss man comes and inspects everything and in my case, did some finishing touches (he painted all my vent pipes).
The hardest part of the whole experience was finding the right color. You can’t tell with the samples. We went to homes that had our top three choices and they all looked different at different times of the day. We ended up picking the one that was the most subtle and it looks great.
I had mine replaced a few years ago. $14K for a 1700 sq ft house built in 1990. Architectural Shingles. I said don’t do anything “extra” (replacing boards, etc) without my approval and without me taking a picture of it with my own camera. There were no extras.
Roofing-related advice:
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Avoid subcontractors if possible.
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Make sure the roofer has adequate insurance, to cover accidents/injuries to the crew so you’re not hit for the bills, and also general liability insurance. I had one roofing guy come over to give an estimate. When I asked about insurance, he said he didn’t have any, but would be willing to put it in writing that they wouldn’t sue me if someone fell a couple stories or whatever. Yeah, sure.*
*supposedly, the roofer having workmen’s comp insurance (which should be mandatory) means the homeowner wouldn’t be liable in the event of crew injury.
My family sold my parents old home in Nov 2020. We accepted an offer and agreed to an inspection. The report indicated storm damage on the roof.
The realtor took pictures of the damage and got estimates. The roof was replaced for $22,000. It’s a large 3200 sq ft home with three car garage. It’s a big roof to cover. The roofers did a good job and the buyers were satisfied. We closed on the house.
Two months later our State Farm adjuster called and was upset. He had not been consulted. 
He wanted to totally reject our claim. We talked with our agent and reminded them our families have State Farm policies on houses and cars dating back forty years. The adjuster finally agreed to the claim but felt the cost was too high. We settled for $2500 less and the standard policy deductible.
The lessons learned? Don’t rely too heavily on your realtor. She found a reputable contractor that did a good job. But failed to call State Farm before preceding.
Don’t try to replace a slate roof on your own. (Frat bro in wheelchair for life.)
Don’t hand over a $10,000 deposit to someone who looks like a roofer. (Family member never saw the “roofer” again.)
Don’t let the soffit guy working on the freshly replaced roof next door crap on your lawn. (We had words – either ask to use the toilet or go shit in the woods like the bears usually do.)
Don’t get sued by the losing bidder because it was $35k over the next closest bidder.
Why would you think this is the Realtor’s responsibility?
It’s your house, and your insurance - why would the Realtor talk to your agent?
We were ready to back out of the deal. The buyers inspection report wanted us to spend too much. We had already accepted a lower bid than we wanted. We wouldn’t sell at that price and pay for a 20k roof. My mom was ready to list the property again.
The Realtor saved the sale by confirming the damage was from a storm. We thought she had contacted our Insurance. Otherwise how could she assure us insurance would pay for the roof damage?
We should have confirmed that ourselves. Don’t ever trust what a 2nd hand party tells you. Thankfully, it didn’t bite us in the butt.
We did pay to replace the Air Handler in the HVAC. The buyers inspection report recommended replacing it.
I had the roof replaced on my old house, and a neighbor suggested that my insurance might pay for it - and, minus the deductible, it did, and my insurance wasn’t cancelled either (and it was State Farm, no less!).
It never hurts to ask.
We had ours done in December. The house is 25ish years old and many of our neighbors had done theirs already; we were holding off, but had started seeing evidence of leaks so we finally went for it.
We’ve got a 2400 square foot house - Colonial, so 1200/level - plus a 2-car garage. Asked neighbors for contractors and got several references for each of two roofers.
Got bids from both. They were pretty similar - about 8200, plus additional for any plywood that needed to be replaced, which they would not be able to tell until the old roof came off. We wound up picking of the two somewhat at random.
Standard asphalt shingles etc. - nothing out of the ordinary. It was all done in one day. I think they needed to replace 6 or 8 sheets of plywood so that another 500 bucks.
The OP’s bid for 22000 sounds pretty darned high, even allowing for higher SoCal rates.
Anyway: you want to make sure the roofers are legit and have been in business for a while - asking neighbors for references would be my first suggestion (as we did).
Good luck!
Update:
I’m now under a new roof! Selected a roofer who gave me an estimate of $9700
plus the cost of a permit and replacing any rotted wood. Finale price came to
about $10,500 and the job took about 3 days. Thank you to all for your stories
and advice.
That sounds a lot more reasonable than some of the other quotes you mentioned!!
And the additional 800ish sounds spot-on for additional wood replacement - around here, that’s 60-65 bucks per sheet of plywood, so that would be 10-15 sheets depending on your local prices.
I expect it was not fun being at home while the work was done (bang bang bang BANG BANG BANG thud bang BANG thud BANG BANG BANG)