Is the damage to my car in his driveway all my fault?

If you had an accident due to slippery road or driveway the responsibility is yours. The property owner is not responsible for the fact that there was ice on the driveway. You were driving the car and lost control. This would be considered an at fault accident.You should get an estimate before you report the incident to your insurance company. If the damage is under your deductible, then there is no reason to report the claim. If it is over the deductible, make sure the amount you will receive is sufficient, as your rates could go up for the accident. The surcharge would be for three years, and could end up costing you more than the amount you will get from the insurance.If the damage is high enough go ahead and report the incident to your insurance company. If the storm was significant, it is possible the company will consider it a catastrophe and then would not surcharge you.