Topmount to Undermount Sink with Granite?

Is it possible to retro fit a conventional stainless steel kitchen sink with an undermount sink. I have a granite counter top surrounding the 2 sinks. Can this be done and if so, is this a major undertaking? Thank you – Pam

Hello Pam. This might work but it will be very messy and probably not give you the best results. First of all, your top mount sink was most likely caulked around the edge, between the sink lip and the granite surface. When you lift the sink, you will see a caulking stain that will most likely be impossible to remove because it has been there for a long time.

Secondly, a fabricator will have to re-cut and polish the opening to the fit the new undermount sink. A topmount sink cut-out is usually larger than an undermount polished cutout so I doubt you will find a large enough undermount sink that will allow you to do what you want.

If you want to pursue this further, start by measuring the already cut opening in the existing countertop. You might have to get under the sink to measure how and where it was cut. Then look for an undermount sink that is bigger than the opening and still fits within your cabinet size. If you pass these two hurdles, go ahead and pull the sink up to see how bad the caulking stain is.

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2 Questions Recently Posted:


  1. Hi,

    I think my problem is almost the same as Pam. IThe only difference is that it is just installed. Here’s what happened. I ordered a granite countertop and then had not much idea about the top mount and undermount sink… So then , because the top mount sink is more cheaper I said I would not mind the top mount sink. Then after few researching, I found out that undermount looks better than top mount:( then so I called in the copmany where I ordered the granite, but it’s too late … coz they cut it already and its now ready to install:( I asked him if there’s a possibility for him to make it for undermount, he said no:( But is it really NO? that it is not possible? is it really too late? What can I do? It is still new and they will actually be installing it tomorrow:( what should I do? I would like undermount…

    Thanks…
    Amie


  2. I also just had granite counter tops installed. I have an undermount sink. The problem is the hole cut for the sink is not contoured to the sink properly. Yes, I did give the installer the template and the actual sink so he could cut it out. It’s just not a quality job. Can the “cut out” be re-cut, now that the top and sink are installed? Any help is appreciated. Thanks Joe