The simple answer is that if your contractor (or more specifically your plumber) has the specs that are in the link you just provided, and assuming you are using the standard 34" counter height shown in the specs, then they should be able to determine what height their rough-ins should be. I'm assuming the same plumber is doing the rough-ins and also installing the fixtures, so they'll know the dimensions of their drains etc., thus, they'll be able to determine from the specs where the rough-ins should be.

First a simple calculation. With 34" counter height it looks like the bottom of the cabinet is about 16" off the floor. You need about 5-6" from the top of the drain pipe to bottom of the P-trap, which puts you at 22" to the top of the pipe in the wall, or about 21.25" on center. Now you need to get more info on the distance from the bottom of the installed sink to the top of the counter so that you can calculate how far it goes down into the cabinet. If the drain fitting on the bottom of the installed sink is at about 23.5-24" or higher, it should work fine at 21.25" on center.

I took a quick measurement of my cheap HD vanity and the bottom of sink is about 25 1/4", and the bottom of the cabinet is 13". My rough-in is at about 18" on center and there is barely enough space to fit the trap above the cabinet bottom. Allowing 6" for the trap would be better than 5".

Bruce

My wife bought a similar vanity, but not from Restoration. I'm an engineer and it pisses me off that the morons who sell these products have no spec's - no on center dimensions, no pictures. It's all stuff from China - that's what you get.

I waited until our vanity was delivered, then I took the measurements.

Maybe the drawers are only 1/2 as deep as the vanity - so they can close, and not interfere with the trap.

@geoffrey-b Tell me about it! My plumber and I together looked at the specs provided and he felt certain that the bottom drawers must have a cutout to accommodate some plumbing (i.e. tail piece/trap). Naturally, I had to reach out to RH b/c there was no info anywhere regarding the drawers. I was completely caught-off guard when they responded saying there are no cutouts.

They did confirm there is extra space (~7") between the back of the cabinet and the drawers when closed, however, the sink drain is at a greater distance from the back of the cabinet than those 7".

I haven't had a chance to update our plumber on the additional info RH provided, so maybe there is a solution. For example, instead of the p-trap being installed below the sink, maybe the plumbing drains water towards the back of the cabinet and the p-trap is then installed within the 7" of space between the back of the cabinet and drawers?

Not sure if I'm explaining that well, and maybe that's the simple/obvious solution. I'm just not familiar with that kind of setup, nor am I a plumber. It's just very frustrating the lack of information available. The RH website says it fits a standard p-trap/drain, but I'm not sure that's entirely the case in this situation.

" It's just very frustrating the lack of information available. The RH website says it fits a standard p-trap/drain, but I'm not sure that's entirely the case in this situation."

There is no such thing as a 'standard' anything. These idiots will tell you anything. IMO you need to wait until the vanity arrives - and then you need to put to partially together - with the countertop and the sink, to figure out what to do.

I keep telling people - doing business with China sucks.