Plumbing Cost to Secure Sink Drain to Vent Stack

[Mark S.]

My property manager had a plumber out to clear a bathroom sink clog. He detected a faint odor in the bathroom when he originally walked in. As he investigated further, he noticed that the drain line for the sink that goes into the wall, connecting the vent stack, was not secured. They were able to clear the p-trap under the sink but will need to cut into the wall to reconnect the drain properly. The plumber bid the repair at $935 to correct the plumbing connection in the wall and has now lowered it to $735.

Does this sound like a reasonable price to reattach one drain to the vent stack in the Dallas area (Arlington to be exact)? It seems a little pricey to me. I'd be willing to pay a premium to have my property manager handle all of this but it doesn't seem like it would take a plumber more than 1 hour to complete this repair.