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Question DetailsAsked on 12/11/2013

What is the standard rough -in for the waste line and hot and cold lines for a kitchen sink?

My kitchen was destroyed in Hurrican Sandy. The contractor had his plumber install all new pipes for my kitchen sink, stove, dishwasher etc. The waste line and hot and cold lines were brand new. I was adamant that I wanted to keep my garbage disposal and had the plans, before they were hired, drawn and in the kitchen with the specs of the cabinets, counters & Sink (an undermount, deep sink). the waste line is at about 22" off the ground and the hot and cold are at about 24" off the ground. The counter is typically 39" off the ground, so shouldn't that give them a heads up? They were too high for my garbage disposal and almost too high for the sink. I had to replace the Krauss drain with one from Ace Hardware. I've been told there is a standard and I've been told there's not. What are your opinions?

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There really isn't a code for it but common practice is somewhere near the measurements you gave. Kitchen countertops are usually closer to 36" 37". Base cabinets are typically 35.5" (+ or - .5 inch depending on manufacturer) and the tops can vary in thickness. The height of the supply valves should not affect the sink since they shouldn't stick out further than the open space behind the sink for the faucet and lines to be connected. The biggest issue might be the waste line but even that has some adjustment in final hookup. If the disposal can't be hooked up properly due to the deeper sink that was selected (have documentation by way of a material selection sheet before the job started) it is the contractor and plumber's problem to lower the waste line. It shouldn't be that difficult unless the cabinets are custom with full backs. In that case it may be easier to cut the wall covering on the other side and then patch it once the plumbing has been moved. If the contractor can claim he didn't know you selected such a deep sink (it must be deeper than 9") the fault is yours, whether you intended it or not. There should have been a material selection done at the beginning of the job which would have set the needed heights of plumbing, electrical, etc. to make sure ecverything went together as needed. If you have a copy of this paper listing the sink you are using, he's on the hook to make it right at his cost. Just stating you wanted a deep sink isn't enough. Most manufacturers call their 9" sinks a deep bowl, versus their standard 8". If you got something deeper than that it should have been pointed out explicitly, such as that it is a 10", 11", etc. deep sink.

Answered 6 years ago by Todd's Home Services


Sounds like either your general contractor or the plumber dropped the ball if you gave him those specs at the beginning of the job. The supply lines should just make it since the sink being 9 inches deep from the bottom of the counter should leave you 1 1/2 inches, a bit close in my opinion in case an emergency shut off of the valves is needed. The disposer is a different thing and the drain line should have been dropped to match the specs. It is not that hard to lower the drain in most cases. Generally you can cut out the back of the cabinet and then the drywall to access the pipes and then lower them unless the drain in the wall runs horizontally to the stack. I have run into this with remodel jobs when a client replaced the laminate top with a granite one with under mount sink. I cut out the back and save it do the repair and cut a slightly larger hole than the original and use the cut out as a plug for the old drain hole. I do replace the sheetrock cut out so as to maintain a draft free wall. It sounds from your post that the counter and sink are already in, if not it is way easier to just pull the sink base out and make the adjustments needed. If you gave him the specs it should be done at the contractors expense not yours.


Answered 6 years ago by ContractorDon

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