@Katie Huynh there are a few different factors. A house is only worth what a buyer is willing to pay for it. If it’s listed for $480K and it would be personally worth it for your buyers to pay $500K then yes, offer $20K over.
For instance, a piece of land with an oil well underneath it is worth probably $1,000 to me. Because I don’t know anything about oil and don’t care to learn anything. To an oil miner, it’s worth $1,000,000. Same piece of land, different people.
As long as the buyers think it’s worth it to them to have it $20K over the current asking price, then go for it. Depending on down payment, if it appraises for $440K and they paid $500K, make sure they have at least 60K cash to put into the deal, I’ve seen many times people offer over asking price and don’t have the cash to cover the delta between the purchase price and appraisal (because a lender will only lend based on the appraised value).
20K over ask on a $480K home is like a 4% increase. Where I am, we are offering 20K over on a $300K home and losing left and right, just for perspective
Any more questions, please ask!