The maximum mounting height for lavatories in public restrooms (washrooms) is

According to the 2010 ADA Standards for Accessible Design, lavatories and sinks intended for public use must be installed with the front of the rim or counter surface at a maximum height of 34 inches (865 mm) above the finished floor. This height ensures that the lavatory is approachable and usable by individuals who use wheelchairs, allowing for proper knee and toe clearance underneath while keeping the basin within reach. This standard is a fundamental requirement for creating accessible restroom facilities.

A. 24" [610 mm]: This height is significantly below the standard, making the lavatory too low for comfortable use by most adults, including those in wheelchairs.

B. 30" [762 mm]: This height is below the maximum allowable and is closer to minimum clearance heights, not the maximum mounting height for the lavatory rim.

D. 36" [914 mm]: This is a common height for standard, non-accessible countertops and is too high to be accessible for a person using a wheelchair.

1. U.S. Department of Justice. (2010). 2010 ADA Standards for Accessible Design. Section 606.3 Height. Retrieved from https://www.ada.gov/regs2010/2010ADAStandards/2010ADAstandards.htm#Toc280112438

2. Ballast

D. K. (2017). Interior Design Reference Manual: Everything You Need to Know to Pass the NCIDQ Exam (6th ed.). Professional Publications

Inc. Chapter 10: Building Codes and Regulations

Section on Accessible Toilet and Bathing Facilities.

3. Ramsey

C. G.

& Sleeper

H. R. (2016). Architectural Graphic Standards (12th ed.). John Wiley & Sons. Chapter: Accessibility

Section on Plumbing Fixtures. (This standard reference work consistently cites the ADA guidelines for lavatory heights).