My house is insured for $359K, the lowest amount I could choose. My deductible is $10k, the highest amount I could choose.
If I were to switch to a $5k deductible, it would cost $11/mo more; $28/mo more for $2k deductible.
This is with USAA.
I would rebuild the house myself if needed, so I am not concerned with a high deductible and low insured amount.