A plumber is renovating an existing accessible washroom. The original water closet was installed with the centreline 450 mm from the sidewall. The new code requirements specify a minimum of 450 mm to 480 mm from the centreline to the sidewall. A grab bar is currently installed on the sidewall, 300 mm from the back wall. Which adjustment is necessary to ensure the water closet and grab bar comply with current barrier-free regulations while optimizing for functional use?

Question: A plumber is renovating an existing accessible washroom. The original water closet was installed with the centreline 450 mm from the sidewall. The new code requirements specify a minimum of 450 mm to 480 mm from the centreline to the sidewall. A grab bar is currently installed on the sidewall, 300 mm from the back wall. Which adjustment is necessary to ensure the water closet and grab bar comply with current barrier-free regulations while optimizing for functional use?

Answer options:

• No adjustment is needed, as 450 mm is within the acceptable range.
• Relocate the water closet's centreline to exactly 480 mm from the sidewall, maintaining the existing grab bar position.
• Relocate the grab bar to extend a minimum of 600 mm from the back wall, keeping the water closet at 450 mm. ✅ Relocate the water closet to 480 mm from the sidewall and ensure the sidewall grab bar is a minimum of 1050 mm long, starting 300 mm from the back wall.

Correct answer: Relocate the water closet to 480 mm from the sidewall and ensure the sidewall grab bar is a minimum of 1050 mm long, starting 300 mm from the back wall.

Explanation: For optimal barrier-free compliance and functional use, the water closet's centreline should be positioned towards the upper end of the acceptable range (450-480 mm) to provide more transfer space. Furthermore, the sidewall grab bar must be a minimum length of 1050 mm, starting at least 300 mm from the back wall (or 150 mm from the back edge of the water closet rim), extending towards the front, ensuring sufficient support along the length of the water closet. Simply staying at 450 mm may be compliant but not optimal, and just moving the grab bar without considering its length or the water closet placement is insufficient.