The cost of sealcoating an asphalt parking lot or driveway will vary depending on the size of your lot and the condition of your asphalt. Asphalt sealcoat builders and applicators will typically charge a minimum of $3-5 per square foot to sealcoat a residential asphalt driveway. Larger asphalt parking lots or commercial driveways, which require a greater volume of sealcoat material, will cost more.