Leaving the plumbing aside, the biggest problem I see with godmorgon is that your sink is so deep (bottom to top). Godmorgon is really designed to work with sinks that sit on top of the cabinet. The actual godmorgon countertops have very shallow sinks built into the thickness of the countertop itself, and I've seen people make it work with vessel sinks on top of a third-party counter, but you would definitely lose the use of the top drawer entirely with that sink, and possibly have to cut the bottom one down to a not -very-practical depth.

You might want to look into one of the other sink bases, like the one with two doors. (Sorry, don't remember the name.) It's not as pretty but it would be easier to make it work if it's deep enough from the wall to the doors.

Thanks! Sorry, I should have said that I would also get a new sink to fit on top of the cabinet. I agree, the current one would be too deep.

I'll take a look at the other cabinets just in case this one turns out not to work with my pipes. (I think I know which one you mean with the doors but I also can't remember the name!)

The drain in my last bathroom went through the floor because the wall behind was brick. The carpenter measured carefully and cut a hole in the bottom of the vanity for the drain and holes in the back for the water supply

My question is what do you do about the water supply pipes coming in from the side and the cabinet? The cabinet will not sit flush to the wall with those pipes and I don't know how you would cut it to get those inside the cabinet without sort of messing up the structural integrity of the cabinet?

Buy the cabinet and sink you want. Remove this one, then install the cabinet and sink. You'll cut the cabinet around the wall-mounted supply lines; not a big deal.

I don't see a vent on your sink. Is it possible to have the vent connected to your drain within the floor? If so, you don't have a problem, but if there is no vent, that is not a good situation. Sewer gases could enter your house and make you sick.

If your building code in Sweden allows mechanical vents, you could add one of those. If not, you will have to connect your drain to your buildings existing vent system.

We just finished our first floor powder room reno. The new Godmorgon cabinet and sink sits on an outside wall, so the drain goes down into the floor and the vent had to fit into the space behind the drawers as well, which made the installation tricky. Our state doesn't allow mechanical vents, and as we didn't want to have the vent in the outside wall, it had to exit the cabinet on the side, where it continues inside an interior wall until it joins the existing vent system of our house.

You might want to hire a licensed plumber to do this, for us it was tricky to make everything fit within the cabinet and end up with an acceptable P-trap, versus a problematic (and here forbidden) S-trap. (P-traps take up more space).

@palimpsest: Yes, I think we'd have to cut around the pipes on the wall. But it's very good to know that other people have faced this issue. I couldn't find anything online and I was beginning to wonder if I was the only person in the world with this piping configuration!

@Joseph Corlett, LLC: Thanks! I'm just hoping there's space for the all the drainage pipes behind the drawers.

@pippabean: Absolutely no idea about the vent. Perhaps it's in the wall/floor? Your situation sounds tricky with the additional piping needed. I think I'm also going to find it difficult to fit all the piping I need behind the drawers. Yes, getting someone in to take a look is sounding like a better and better idea.

I'm no plumbing expert, but I've learned a bit during our own rehabs. (Any experts, please correct me if I'm wrong here)!

First thing: After thinking about it, the vent can't be in the floor, it always is connected at the end of the P-trap arm, otherwise it just won't do its job. You really just don't have a vent, I don't see a mechanical one in your pic. Yikes! This makes your sink not function properly. No matter what, you NEED to vent your drain somehow. At least have a mechanical vent/ anti syphon P-trap installed. Insist on this.

Make sure your plumber installs a P-Trap, not a S-Tap. S-Traps can syphon all the water out of your trap, letting sewer gas enter your house. (This can happen when you flush the toilet next to the sink!) or just when you use your sink. Not good.

What makes a P-Trap is the "arm" a piece of straight pipe (of a min. length of twice your pipe diameter, that follows your trap. The vent (no matter what type, is always connected after the P-trap arm, where the drain part turns down, the vent goes up.

If you offset your Godmorgon cabinet in respect to your existing drain, something like this could work for you. Just replace the green vent pipe with an anti syphon P-Trap or attach another type of mechanical vent. This would be a major improvement on your current situation.

If you cannot offset your cabinet, you could assemble your trap something like this: (just make sure you have enough space for a properly sized "trap arm".

" You really just don't have a vent, I don't see a mechanical one in your pic."

While I'm not familiar with world plumbing, I believe the angled section between the sink and trap in the first picture is a mechanical vent.

I also wondered whether that angled part was the vent, but I'm not at home right now so can't check. But in the Ikea instructions and the following photo it looks like that part might be to connect to the "overflow hole" in the sink (I think that is built in to my sink so hasn't been connected).

Definitely something to ask the plumber about. The anti-syphon p-trap or mechanical vent could work. I live in an apartment and I have no idea where the vent pipes are in the walls (or if there even are any).

Joseph, if you're right about this, I don't think it would possibly work, as it's before the trap. vents need to be connected after the trap. It might be some kind of clean-out? As the sink seems to have an integrated overflow.

katie, yes get a good plumber for this job.

Edit: katie, I think you're right, it's an unused pipe connection for an overflow. It's unused due to the fact that your sink has an integrated overflow.