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Glam Journal

Can you use a 12-inch rough in toilet?

Author

Chloe Ramirez

Updated on April 05, 2026

Can you use a 12-inch rough in toilet?

You can definitely replace a toilet with a rough-in of 14 inches with one with a rough of 12 inches. The problem with this method is that a 2-inch gap will be left between the toilet tank and the wall. It is inexpensive and can be used to install all toilet models.

What size rough in toilet do I need?

12 inches
The standard rough-in is 12 inches, though you may encounter 10-inch and 14-inch rough-ins in older homes. You should find the rough-in measurement in the new toilet’s product information.

How do I know what size toilet I need?

Measuring is done with the old toilet still in place. Start by measuring from the wall behind the toilet to the center of the bolts at the base of the toilet. If your existing toilet has four bolts, measure to the center of the back bolts. This measurement is known as the rough-in measurement.

Can you replace a 10-inch rough-in toilet with a 12-inch?

The rough-in for your bathroom plumbing should match the rough-in for the toilet. Even if a toilet is designed for a 10-inch rough-in, you can still install it in a space with a 12-inch rough-in.

What does 12 rough-in mean for toilet?

The toilet rough-in refers to the distance from the finished wall to the center of the toilet’s floor drain or waste outlet. Most toilets have a rough-in of 12 inches, although it’s not uncommon for older homes to have an unusual size such as 10″ or 14″.

Can you replace a 12 inch rough-in toilet with a 10 inch?

A toilet with a 12-inch rough-in will definitely not fit into a space with a 10-inch rough-in, but a toilet with a 10-inch rough-in actually has extra space in a 12-inch rough-in space.

How far from the wall should a toilet rough-in Be?

Standard drywall is 1/2 inch thick, so the plumber should set the toilet flange at least 15-1/2 inches from the center of the flange to the wall framing. The standard distance from the back wall is 12 inches, or 12-1/2 inches from the center of the flange to the wall framing.

Can you replace a 10-inch rough in toilet with a 12-inch?

How big of a toilet do I need for an 11 ” rough toilet?

Most 12″ rough toilets have 3/4″ behind the toilet, thus they will mount with 11.25″ from the wall, measured from the wall to the center of the drain. Sometimes you can move the bolts out that extra 1/4″ and install the standard 12″ toilet anyway. If not, the other option is the 10″ toilet.

How big of a gap does a rough in toilet leave?

These four toilet models leave a one inch or larger gap between the tank and the wall when installed on an exact 12-inch rough-in. Because of this gap, you can install them even on a shorter 11″ rough-in. Similarly, these toilets are good use as 11.25 inch rough-in toilets or 11.5 inch rough-in toilets.

Can a 11 inch Toilet fit in 11 inch wall?

Wall tilt: Sometimes walls aren’t perfectly vertical. So if it’s 11 inches at the floor, and the wall leans a little into the room, there could be issues fitting one of these 11 inch toilet that doesn’t have a gap between the back of the tank and the wall. So check to make sure your wall is relatively vertical.

Do you have to measure the rough in of a toilet?

If your toilet is positioned in the center of the room then the rough in measurement won’t matter, however, most people choose to have the back of their toilet against a wall. If you have a corner toilet, you’ll still measure the rough in (below I’ll share how to measure a corner rough in).

Most 12″ rough toilets have 3/4″ behind the toilet, thus they will mount with 11.25″ from the wall, measured from the wall to the center of the drain. Sometimes you can move the bolts out that extra 1/4″ and install the standard 12″ toilet anyway. If not, the other option is the 10″ toilet.

These four toilet models leave a one inch or larger gap between the tank and the wall when installed on an exact 12-inch rough-in. Because of this gap, you can install them even on a shorter 11″ rough-in. Similarly, these toilets are good use as 11.25 inch rough-in toilets or 11.5 inch rough-in toilets.

Wall tilt: Sometimes walls aren’t perfectly vertical. So if it’s 11 inches at the floor, and the wall leans a little into the room, there could be issues fitting one of these 11 inch toilet that doesn’t have a gap between the back of the tank and the wall. So check to make sure your wall is relatively vertical.

How do you measure the rough opening of a toilet?

How to Determine a Toilet’s Rough in Opening. Most rough openings are 12 inches, but can be as little as 10 inches and as much as 14 inches. 1 Place the end of a tape measure against the wall behind the existing toilet, not on the molding at the base of the wall.