Diagram depicting the toilet's measurements

Bidet toilet seats generally come in two available sizes, round or elongated.  Choosing the right size depends on the shape of your toilet bowl.  Toilet bowls are also sold in two main sizes, either round front or elongated front.  Aside from comfort, it’s a space issue that affects smaller bathroom setups as elongated toilets extend about 29.5” while round toilets extend about 27.5”. 

Kohler Santa Rosa toilet

Recently, toilet manufacturers like Kohler and American Standard have come out with a new style of toilet known as compact elongated.  Compact elongated toilets provide the comfort of an elongated bowl, but fit into the space of a round front toilet. 

diagram of compact elongated, elongated, and round toilet side by side comparison

The Kohler Santa Rosa is the most popular of these new compact elongated style toilets.  While they are great for users with compact bathrooms, toilets like the Kohler Santa Rosa make choosing the right sized bidet toilet seat trickier.

Which Bidet Seat Models Will Fit?

Because the Kohler Santa Rosa has such limited space between the toilet seat bolt holes and the front of the toilet tank, we can only confirm that the Alpha JX and Blooming NB-R1063 will fit for sure. The Santa Rosa will just barely have exactly enough room behind the bolts to fit the Alpha JX or Blooming mounting bracket.


Buying an Elongated Bidet Toilet Seat

Elongated bidet toilet seats like the Alpha JX and Blooming NB-R1063 are about 20.8” in total length from the rear of the unit to the front.  This works perfectly for regular elongated toilet bowls because they generally have about 21-22” of bowl space to utilize.  Since compact elongated toilets like the Kohler Santa Rosa are meant to fit into the space of a round, there’s only about 19.75” of bowl space available. 

Mounting an elongated bidet toilet seat onto a Kohler Santa Rosa will result in about 1” of overhang in the front of the bowl.  This means that the toilet seat will extend past the front lip of the toilet bowl by about 1”.  While the bidet seat will still function properly, the appearance will not be ideal.  At BidetKing.com, we want our customers to know this before they purchase to avoid any surprises.  Given this information, most of our customers still choose to go with the elongated size because the larger seat is more comfortable despite the appearance.   


Kohler Santa Rosa top view

Buying a Round Bidet Toilet Seat

Round bidet toilet seats are about 19.4” in total length.  They work great for round front toilets that generally have about 19-20” of bowl surface to utilize.  It makes sense that compact elongated toilet bowls fit within this range with 19.75” of workable space. 

Mounting a round bidet toilet seat on a Kohler Santa Rosa will be a much better fit than the elongated size.  The front of the bidet seat will line up very nicely with the front of the toilet bowl.  However, as is the case with most round bidet seats, the seating area will be reduced and it defeats the purpose of buying an elongated shaped bowl in the first place.  The result is a bidet toilet seat with a nicer appearance when mounted, but reduced comfort. 



Compact elongated toilets like the Kohler Santa Rosa solve space problems when dealing with small bathroom setups As a result, we can only confirm that the Alpha JX and Blooming NB-R1063 will fit for sure.  The compact nature of its design complicates matters when trying to pick the right sized bidet seat.  Elongated bidet seats will feel more comfortable like the toilet was meant to be, but will hang over the front of the toilet bowl by about an 1”.  Round bidet seats will fit better, but the seating area is smaller and less comfortable.  Both bidet seat sizes will function equally well so the final decision is on users to decide which factor they value more: comfort or appearance.