They should easily be able to provide documentation to back it up.And yes, $10,000 in damages after moving out is always excessive.

The tub faucets were broke and caused excess moisture and steam from this constant flow of hot water.

Should I be worried if a contractor asks for an excess of 50% up-front, on the day of a contract's execution?

If it's in excess of SC liability limit, hire an attorney.

He contacted the underwriter and said we could get an "Excess Comprehensive Personal Liability" plan, which I guess is similar to an umbrella policy.

We just negotiated $50k off of a new build because builders here have an excess of inventory and they are willing to negotiate. 

If they cost you money because of excess utility use caused by an illegal sublease/sublet, then I would charge them for those losses. 

You might recognize me from this Bigger Pockets interview:A little background:I got my start working under billionaire Grant Cardone and his real estate team where I personally raised in excess of $100M of investors capital and was extensively involved in billions of dollars in Multifamily transactions.Since leaving Grant's office in 2022, my first deal was a 55 unit, $8.2M apartment complex in Daytona Beach, FL where I partnered with Ken Gee.

I have a decent deal under contract that doesn't meet my criteria for a landlord hold. However, it is an excellent deal for a flip. My concern is the insurance premium that would prevent a retail buyer from purchasing...

Indy for SURE has a ton of property that is excess might even get a beater house.