Really can be anyone except for heavy items or medical customers...price it accordingly and you'll find people interested

It's not a common size at 21" W x 46" H, but I wouldn't think a basic custom ordered window would be too expensive.

NOTE:To be “bonded” means the Contractor must purchase a Surety Bond, which serves as a form of Insurance to protect the Contractor’s Customers if he or she fails to complete the job properly or fails to pay for permits, subcontractors, or other financial obligations. 7.

Back in the heydays of turnkeys--like 2011-2013--TK providers could get away with being whatever level of jerk-off they wanted to because the deals were so good, personality and customer service took a major backseat.

If you are going to do that and it is not the local custom, your units will appear to be much higher priced and will not attract as many applicants. 

Their customer service doesn't seem to really be extremely helpful as they just send you to 1,000 forum posts.

I vetted Turnkey companies until I found a couple that met my expectations and are getting great reviews from their customers.

In my opinion, this should be a customer service they provide for good will. 

@Nancy LuccaContractors with good reviews have a lot of customers, and aren't super motivated to come out and give estimates, free or paid. 

Each company has their own custom endorsement so you need to find out what perils (causes of loss) are covered and if there are any limitations or exclusions.Some of the Insurance companies are Utica Mutual, National General, Ohio Mutual, Narragansett Bay, and Vermont Mutual.You can get lists of their agents from their websites.