How much does it cost to replace a toilet seat?

it can cost from as little as 100 to as much as 1000 depending who does it and what is actually wrong. if the flange is cast iron it will be more. if it is glued abs or pvc and the drain is broke thats gonna cost more than 200. you may not need to actually repalce the flange and you may be able to use a metal repair bracket. If the flange is unrepairable its a dirty job and if the flange is glued that means the drain has to get cut back and then coupled and extended. and remember plumbers dont fix walls. so any holes made wont be their resonsiblity to fix.