What are the basic ADA clearance checks on a small commercial plan?

The basic ADA clearance checks on a small commercial plan are three things. Can a wheelchair user turn around (turning space)? Can they reach what they need (reach ranges)? Are controls and fixtures mounted at usable heights (mounting heights)? Each one is checked against the dimensions in the ADA Standards for Accessible Design (the 2010 Standards, published by the U.S. Department of Justice), which the plan’s designer or architect should be applying. This guide explains the concepts only. It is general information, not legal, tax, or financial advice, and it is not a substitute for the official standard or a qualified professional.

Turning space

A person using a wheelchair needs room to turn around. This usually matters in a few key places: inside restrooms, at certain dead-end corridors or aisles, and in some small rooms.

The standard recognizes two ways to provide it: a circular space of a specified diameter (60 inches in the 2010 Standards) or a T-shaped space of specified dimensions. On a plan, look for one of these drawn as a circle or T, kept clear of fixtures, furniture, and door swings.

Things to check:

• Is the turning space actually drawn, not just assumed?
• Does a door swing into it? Door swings generally can’t overlap the turning space, though the standard has some exceptions, such as for certain single-user restrooms.
• Does knee and toe clearance under a sink or counter count toward the space? In limited cases it can, but confirm the rule and its dimensions in the standard.

Turning space is separate from the clear floor space needed to approach a fixture. Both usually need to appear on the plan.

Reach ranges

Reach ranges describe how high and how low someone seated in a wheelchair can reach. The standard sets a highest and a lowest allowed height for items people must operate. It also treats a forward reach differently from a side reach. Reaching over or around an obstruction, such as a counter, changes the limits.

Items this usually applies to include light switches, thermostats, outlets, door hardware, paper towel and soap dispensers, card readers, and self-service counters. Check each one on the plan or elevation. A switch placed too high or an outlet too low is a common catch. Some items and space types have exceptions, so don’t assume every outlet or control is covered.

Look up the exact minimum and maximum heights in the current standard, and note any exceptions that apply to your space type.

Mounting heights

Mounting heights are the specific measurements that apply the reach concept to individual items. They are usually measured from the finished floor to a defined point on the item. On an elevation, look for dimensions on:

• Door handles and locks
• Counter and service surface heights
• Restroom fixtures, grab bars, mirrors, and dispensers
• Signs, which have their own height and placement rules
• Wall-mounted items that stick out into walkways

Protruding objects deserve a separate look. A wall-mounted item at head height can be a hazard for a person who is blind or has low vision, because a cane may not detect it. The standard limits how far items can project into a path of travel at certain heights.

Where to confirm the current standard

Rules can be amended, and local codes can add requirements. Generally, use these sources:

• The ADA Standards for Accessible Design, published by the Department of Justice, for the federal rules.
• The U.S. Access Board, which publishes guidance and technical material on accessibility standards.
• Your state or local building code and your local building department, since they may be stricter or use a different referenced standard.
• Your architect, designer, or an accessibility specialist, who can confirm what applies to your project.

Worked example

The numbers below are for illustration only. They are chosen to resemble commonly cited values, but always confirm the actual requirement, and any exceptions, in the official standard. Say a turning circle must be 60 inches in diameter, and a switch must be mounted no higher than 48 inches.

• A plan shows a restroom with 54 inches of clear floor between fixtures. That is 6 inches short of 60, so the layout needs to change or a different compliance option needs to be confirmed.
• The same plan shows a light switch at 52 inches. That is 4 inches above the sample maximum, so it should be lowered.

The method is the point: find the required number, find the plan’s number, compare. Then use the real figures from the official standard for your project.

Common mistakes

• Using sample or remembered numbers instead of the current standard.
• Counting door swings or furniture as clear floor.
• Checking only the main entrance and skipping restrooms and break areas.
• Forgetting the clear floor space at the fixture, not just turning space in the room.
• Ignoring local code, which may be stricter than the federal rules.
• Assuming a plan is ADA compliant because a permit was approved. A permit doesn’t guarantee compliance.