12 inches is the most common toilet rough-in size.
Toilet Clearances
We recommend leaving at least 21" of space in front of the toilet and at least 15" of space from the center of the toilet to a wall or another object.
Toilets can fit into spaces as small as 30 inches (76 centimeters) wide and 54 inches (137 centimeters) long, but at least 36 inches wide and 60 inches deep is much more comfortable.
Typically, the standard rough-in size is 12 inches, though older homes may have 10-inch or 14-inch rough-ins.
The standard rough-in dimensions for toilets is 12 inches. In older homes or small bathrooms, you'll sometimes see rough-in dimensions of 10 inches or 14 inches. Determine your bathroom's rough-in by measuring from the wall behind the toilet to the middle of the bolts on the base of the toilet.
Can I replace a 10-inch rough in with a 12-inch rough in? Short answer: no. It's ideal to find a toilet that matches your existing toilet rough-in dimensions so you don't have to call a plumber to update your plumbing, which could drastically increase your toilet replacement cost.
Traditional toilets are 15 inches high. Comfort height toilets (or “right height” toilets) have higher seats than traditional toilets, usually between 17 inches and 19 inches. Comfort-height toilets are becoming a popular option for many households.
For most toilet installations, the rough-in is 12 inches. Sometimes in small baths or older homes it can be 10 to 14 inches.
The rough-in distance in the newer homes from the wall to the center of the toilet drain is 12-inch, while, older homes have a distance of anything between 10- or 14 inches. A wall-mounted toilet also needs a 10 inch thick wall to accommodate the flushing system.
The correct measurements for a toilet is at least 21 inches in the front of the toilet, 15 inches on the sides, and at least 30 inches from anything else in the bathroom.
According to the IBC, the minimum clear floor space in front of a toilet should measure at least 21 inches wide and 24 inches deep. This minimum clearance ensures that users have enough space to approach the toilet, maneuver, and transfer comfortably.
Generally, building regulations state that the minimum size for a loo is to be 700mm wide and 1300mm long. However, that can be uncomfortable if you have large family members, or expect guests who are pleasantly plump to be using your loo.
Most toilets will have a 2-inch drain or a 3-inch drain. Fluidmaster manufactures a standard or universal size of flush valves with flappers and are among the most common flush valves to be used.
The clear space in front of water closets and bidets in residential structures shall be 21 inches (533 mm) minimum. For all other occupancies, the clear space in front of water closets and bidets shall be 24 inches (610 mm) minimum.
The standard toilet size has a depth of 28-30 inches, with a width of 20 inches and a tank height of 27-32 inches. This allows for a rough-in measurement between 10-14 inches.
Plugged at the U-pipe, the fresh water blocks sewer gases and lets them harmlessly leak out the plumbing vents. Every plumbing fixture needs to have a vent to work properly. Bath tubs, toilets, washing machines and kitchen sinks need the biggest plumbing vents.
The minimum space in front of the toilet is 21 inches, though 30 inches is recommended for comfort. Front toilet space clearance ensures that the user has enough room to take care of their needs and that the shower, sink, tub, and door, remain unobstructed.
Toilet discharge hole (vertical): Drain located at floor height; distance is zero. Toilet side-to-side buffer: Measured from the center of the toilet to either side, minimum. clearance is 15 inches to any wall or other fixture; 18 inches is recommended if the bathroom layout allows for this.
#2: The Clearance From the Center of the Toilet To Any Adjacent Fixture or Sidewall. This measurement is 15 inches. That's the minimum (you can have more). So looking at the toilet, make sure there are at least 15 inches of clearance from the center of the toilet to any adjacent fixture (or wall).
The standard rough-in size for a toilet is 12 inches in contemporary houses and 10 inches in older homes. These are the toilet rough-in dimensions: Supply line (vertical): 8 1/4 inches of height to accommodate most base moldings.
While it is possible to replace a 14” rough-in toilet with a 12” rough-in toilet, this will leave a sizable gap between the toilet tank and the bathroom's finished wall, which will do nothing to save space in a smaller bathroom.
Toilet tank braces can be adjusted to fit the gap between your tank and wall. Clipped on back edge of tank, under lid, braces are practically invisible when installed. Anchor your tanks with Secure-A-Tank to protect against costly leaks and repairs.
For most users, a comfort height toilet, which ranges from 420-460mm (17-19 inches), is often preferred. This higher elevation is particularly beneficial for seniors or those with knee and back problems.
With average costs for toilet installation ranging from $224 to $533, most people around the country are paying $374 for toilet installation costs. While they are paying $120 on the lower end, installation costs can go as high as $826 in some cases.
If a bathroom remodel makes use of an existing rough-in that is another size, 10 or 14 inches for example, choices can be more limited. Most people find elongated toilet bowls to be more comfortable, but in a small bathroom, a round bowl can save space.