Bathroom Requirements for Dental Offices in Massachusetts

Determining the number and size of bathrooms required in dental offices within Massachusetts has been a subject of ongoing clarification and regulatory updates. Oversight is provided by the Massachusetts Board of State Examiners of Plumbers and Gas Fitters, which enforces the 248 CMR 10 Uniform State Plumbing Code. According to the Board, dental practices are classified under the Medical “Use Group” rather than the “Business” group as defined by National and State Building Codes. Furthermore, the Board interprets “Dental Care” as encompassing any treatment where procedures may occur—a definition that is broadly applied across most dental specialties, even though specific guidance on what constitutes a “procedure” is not provided in the code.

For most dental offices, relevant requirements can be found in Section 10.15 of the code. If the facility is no larger than 3,000 square feet, with no more than 15 staff members, and accommodates no more than 15 patients (including visitors) at one time, the following applies: one non-gendered accessible (handicap) restroom must be available for patients and another for staff.

Section 10.15 Fixture Requirements Summary:

• Medical Facilities: Minimum fixture requirements are determined as follows:
• Hospitals and Nursing Homes:

                   – Patients: Based on total bed count.

                   – Staff: Based on maximum number on duty at any given time.

                   – Visitors: Maximum number of seats in waiting areas.

• Facilities and Offices Where Procedures Are Performed:

                   – Patients: Determined by the maximum number present at any time.

                   – Staff: Determined by the maximum number on duty.

                   – When both employees and patrons do not exceed 15 and the space is less than or equal to 3,000 square feet, one unisex/gender-neutral restroom may be provided for staff and one for patrons.

                   – Handwashing facilities are required in all examination rooms.

• Facilities Without Medical Procedures:

                   – Patients and staff: Maximum simultaneous occupancy; separate restrooms for patients and staff are not required.

• Accessibility: All toilet facilities must be directly accessible without traversing through another medical office.
• Handicap Accessibility: Patient and visitor restrooms must be handicap accessible and provided on each floor.

Where core facilities or shared public restrooms (e.g., those located in common hallway or lobby areas) exist, these may fulfill requirements for patient and visitor restrooms, provided they are located on the same floor and within 300, or in some cases 400, square feet of the office. However, such shared facilities cannot substitute for required staff restrooms.

For offices exceeding 3,000 square feet, the code requires two sets of restrooms—TWO each for patrons and Two for Staff—with allowances for core facilities to serve patron needs. In certain circumstances, variances have allowed this requirement to be reduced from four to three total restrooms; experience indicates this typically applies to spaces under 3,600 square feet.

For smaller offices, it is generally acceptable for spaces under 1,250 square feet to provide a single restroom.

A sample of handicap bathroom size requirements for Massachusetts is provided below. Note that these requirements differ slightly from federal ADA standards, but state code takes precedence in most jurisdictions.