Bathroom sink conversion, single or double?

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Jamie

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Friends,



I would love to hear your opinions and feedback on this post as i am trying to settle a bet and maybe even prove a point : )
Here is the situation:

Current bathroom vanity is a standard 72” cabinet with only one sink located on the left side that also shares a drain with a sink on the opposite wall serving the master bathroom.

Option 1: Replace the vanity with a single sink that is in the center, requiring moving the water locations and drain and also affecting the drain it currently shares with the master. Center is basically in between the two vertical copper pipes where the “blue # 1” is shown in the picture. NOTE these are 2x6 studs

Option 2: Replace the vanity with a double sink, leaving the plumbing for the current sink in place and only needing to move water and drain to the serve the right side while not disturbing the master sink drain. The new sink would basically be where the “blue #2” is shown in the picture.

Question one: What option do you feel would be easier or harder and how would you approach either option?


Question two: Regardless of which job is easier or harder, do you think a single sink that is on center is “cooler” than a double sink, or is a double sink the way to go?


Can’t wait to hear your thoughts and suggestions!

Jamie Love
Single or Double.jpg
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John Gayewski

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I like the idea of a double sink vanity. I haven't lived with one though so I can't say I prefer that idea.

As far as the plumbing I can't tell what would be easier from the picture. It looks like you'll have to cross some piping to add a second sink, but I'm not sure.
 

Storm rider

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As to question 2, speaking only from a real estate perspective, if it is an ensuite bathroom or it is the only bathroom on that level of the house, it should be a double. If it is a secondary bathroom it can be either. At 72" it is certainly large enough for a double. See also response #3 above for a very persuasive case for double.
 

Tuttles Revenge

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In most of our recent remodels we are replacing single sinks with doubles.

They're both essentially the same amount of work IMO. Ever so slightly less work for the double since you wouldn't have to reconnect the sink on the existing side.

For Option 1: Single Center: You would have to cut the drain down low to add a tee for the drain, replace the back to back fitting with a single san tee, cut and offset the vent to allow the drain to pass by. Tee into the vent stack for the new sink.

For Option 2: Double sink: You would have to cut the drain down low to add a tee for the drain, Cut and offset the vent to allow the drain to pass by. Tee into the vent stack for the new sink.
 

Jeff H Young

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Id say double lavs if its a master or jack and jill . on a 5 ft not a lot of counter left but a 6 ft should be plenty room for 2 lavs.
plus we are plumbers how can we not vote for more work oh yea when we arent getting paid for it. I got a feeling double lavs going to be your best interest Jamie LOL.
 

GL77

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When there is space for it (like in this case) I like double sinks. It gives the opportunity for each person to have their personal space with the items they use nearby and also both can get ready at the same time if they need to. On a smaller counter, I think a centered sink is the way to go or it gets too crowded.
 

Markos

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BTW - I’m “local” also and in the process of sourcing a top with under mount sinks for mine. Best bet is to go with the factory top and sinks. If you want something different or perhaps cheaper I’m happy to share notes and estimates. If you get a vanity without a top, make sure the depth is less than 22”. My cabinet is 22” and now I’m in custom countertop mode. :(
 

austinkc1

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  1. Option 2 (double sink) is likely easier as it involves minimal plumbing modifications.
  2. The preference between a single sink or a double sink is subjective and depends on personal preference and the specific needs of the user.
 

Reelbusy

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double for sure on a 72....

then use the wifes still like i do. just to keep the magic alive.
 

Oliversmith34

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Question one: In terms of difficulty, Option 2 (replacing the vanity with a double sink) seems to be the easier option. Since the plumbing for the current sink is already in place, you would mainly need to move the water and drain to serve the right side. This would likely involve extending the water supply lines and connecting them to the new sink location, as well as adding a new drain line for the second sink.
Option 1 (replacing with a single sink in the center) appears to be more complex. It would require moving both the water locations and the drain, which would involve significant modifications to the existing plumbing. Additionally, since the drain currently shares with the master sink, it would further complicate the plumbing changes needed.
To approach either option, it would be advisable to consult with a professional plumber who can assess the existing plumbing layout, provide a proper evaluation of the work involved, and offer the best solution based on your specific situation.
Question two: The choice between a single sink on center and a double sink is subjective and depends on your personal preferences and needs. Here are a few considerations:
  • Functionality: A double sink provides separate spaces for two users, allowing simultaneous use and providing convenience, especially in a shared bathroom. A single sink may be sufficient if you don't anticipate multiple users needing the sink at the same time.
  • Space availability: Consider the available space in the bathroom. Will a double sink fit comfortably without overcrowding the area? A single sink may be a better option if space is limited.
  • Design and aesthetics: The visual appeal of a single sink on center versus a double sink depends on the overall design and style of your bathroom. Some people prefer the symmetrical look of a single sink in the center, while others appreciate the functionality and balance of a double sink.
Ultimately, the choice between a single sink and a double sink is a matter of personal preference and the specific needs of your household. Consider your practical requirements and the visual impact you desire to make the decision that suits you best.
 

Suceress

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I think it is important to consider the function in this case. Is there more than one person using the bathroom at a time? Would there need to be a 2nd sink?
Resale value is another consideration. I've seen a lot of shows where people want double sinks in a bathroom. I personally like a single sink, but then I have my own bathroom and am not having to use sinks the same time as anyone else. My mother's ensuite has a 72" vanity with a single sink in the center. It leaves more room for her junk. However, trying to find 72" wide countertops with only one center sink is not easy. You'd pretty much have to custom order one unless you are making one yourself. It's much easier to find double sink versions. It certainly sounds like it will be easier to do the double sink. You can run PEX for the 2nd sink and have shutoffs for it before going to the supply lines. I like to add shutoffs inside for pretty much everything in case of emergencies.

So, I guess I'm voting for double sink.
 

theroot1972

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Hate to answer a question with a question but the piping that is just to the left of the blue “1”, what’s it for? Not the copper of course.
 

sajesak

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Friends,



I would love to hear your opinions and feedback on this post as i am trying to settle a bet and maybe even prove a point : )
Here is the situation:

Current bathroom vanity is a standard 72” cabinet with only one sink located on the left side that also shares a drain with a sink on the opposite wall serving the master bathroom.

Option 1: Replace the vanity with a single sink that is in the center, requiring moving the water locations and drain and also affecting the drain it currently shares with the master. Center is basically in between the two vertical copper pipes where the “blue # 1” is shown in the picture. NOTE these are 2x6 studs

Option 2: Replace the vanity with a double sink, leaving the plumbing for the current sink in place and only needing to move water and drain to the serve the right side while not disturbing the master sink drain. The new sink would basically be where the “blue #2” is shown in the picture.

Question one: What option do you feel would be easier or harder and how would you approach either option?


Question two: Regardless of which job is easier or harder, do you think a single sink that is on center is “cooler” than a double sink, or is a double sink the way to go?


Can’t wait to hear your thoughts and suggestions!
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Jamie Love
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Hi, I would like to convert a single sink to a double sink vanity in my master bathroom. The plumber said the vent is 1.5" so it's not possible (code). I can't find anything about this. I would hope he's correct, but would like a second opinion from the interwebz
 

Tuttles Revenge

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Hi, I would like to convert a single sink to a double sink vanity in my master bathroom. The plumber said the vent is 1.5" so it's not possible (code). I can't find anything about this. I would hope he's correct, but would like a second opinion from the interwebz

The 1.5" vent would be fine for 2 lavatory fixtures. Both the UPC and the IPC consider lavatory sinks to be 1 Drainage Fixture Unit or DFU. IPC allows up to 10 DFU on 1.5" vents, UPC allows 8DFU.


The IPC allows for 2 DFU on 1.5" horizontal pipe (possibly 3, but i'm not certain). The UPC allows 2DFU on 1.5" vertical, but only 1 on horizontal.

And another method is to install both sinks to 1 trap on the existing trap arm so long as the sinks are within 30" center to center.
 
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