Part IV · Standards and grades · Chapter 22
Accessibility and code
Reach ranges, knee and toe clearance, counter heights and operable hardware from the 2010 ADA Standards, and where they land on a millwork drawing.
13 min read
Accessibility rules do not care who drew the cabinet. A reception desk built at 38 inches, where the accessible length had to be 36 or lower, does not comply, whoever drew it. The drafter is the last person who can catch it on paper, because the drafter writes the numbers down.
This chapter uses the 2010 ADA Standards for Accessible Design, published by the US Department of Justice at ada.gov. Every number below is quoted from that document, with its section number, so you can check it. Other countries publish their own standards, and many US states and cities add their own rules on top of the ADA. This chapter does not cover them. Find out which code governs your job before you use any number here.
The Architectural Woodwork Standards, 1st Edition (2009), Section 10, puts the duty on the design professional: "It is the responsibility of the design professional to coordinate accessibility requirements, appliance and equipment sizes, and/or storage requirements with the casework manufacturer and adjust the following dimensions accordingly." That does not make the problem go away when it reaches you. It means your job is to spot the conflict and send it back as a question, in writing. Chapter 24 covers how.
Where the code lands on millwork
The ADA Standards do not have a chapter called "millwork". The requirements that hit casework and counters sit in several places. These are the ones a millwork drafter meets most:
| Section | What it governs | Where you meet it |
|---|---|---|
| 305 | Clear floor space | The 30" × 48" rectangle in front of any accessible element |
| 306 | Knee and toe clearance | Open space under desks, counters, sinks |
| 307 | Protruding objects | Wall cabinets and shelves in a corridor |
| 308 | Reach ranges | Shelf heights, hooks, controls, hardware |
| 309 | Operable parts | Pulls, latches, locks |
| 606 | Lavatories and sinks | Vanities and sink bases |
| 804 | Kitchens and kitchenettes | Break rooms, staff kitchens |
| 811 | Storage | Cabinets, lockers, shelving |
| 902 | Dining and work surfaces | Desks, study carrels, bar tops, tables |
| 904 | Sales and service counters | Reception desks, transaction counters |
Clear floor space
Almost every other requirement starts here. Section 305.3: "The clear floor or ground space shall be 30 inches (760 mm) minimum by 48 inches (1220 mm) minimum." Section 305.5 says it is positioned "for either forward or parallel approach to an element". A forward approach faces the element. A parallel approach runs alongside it.
Section 305.4 allows that space to include knee and toe clearance under the element. This matters on plan: a desk with an open knee space can count part of the space under it toward the 48 inches.
Alcoves
A knee space between two base cabinets is an alcove, and the code wants it wider. Section 305.7.1: "Alcoves shall be 36 inches (915 mm) wide minimum where the depth exceeds 24 inches (610 mm)" for a forward approach. Section 305.7.2: for a parallel approach, "Alcoves shall be 60 inches (1525 mm) wide minimum where the depth exceeds 15 inches (380 mm)."
A designer draws a desk with two drawer pedestals and a 30" knee opening between them. The desk is 30" deep. The knee space is an alcove confined on three sides, and it is deeper than 24". Under 305.7.1 it must be 36" wide. The 30" opening fails by 6". Either the pedestals move, the desk gets shallower, or the architect confirms this desk is not required to be accessible. You do not pick. You ask.
Knee and toe clearance
Section 306 splits the space under an element into two zones by height.
| Zone | Height above finish floor | Maximum depth counted | Minimum depth where required | Minimum width |
|---|---|---|---|---|
| Toe clearance (306.2) | 0" to 9" | 25" | 17" | 30" |
| Knee clearance (306.3) | 9" to 27" | 25" (at 9") | 11" at 9"; 8" at 27" | 30" |
Two rules from 306 catch drafters out:
- The knee space may slope. Section 306.3.4: between 9" and 27", "the knee clearance shall be permitted to reduce at a rate of 1 inch (25 mm) in depth for each 6 inches (150 mm) in height." That is why a sink apron or a modesty panel can come forward as it rises.
- Toe space has a limit relative to knee space. Section 306.2.4: "Space extending greater than 6 inches (150 mm) beyond the available knee clearance at 9 inches (230 mm) above the finish floor or ground shall not be considered toe clearance."
In section, draw the knee clearance as a dimensioned envelope, not as an empty void. Dimension it at 9" and at 27" above finish floor. If a drawer, a cable tray, a support rail or a CPU shelf enters that envelope, the section shows it.
Reach ranges
Section 308 sets how high and how low a seated person can be expected to reach. Storage (811.3) and operable parts (309.3) both point back to it.
| Reach | Condition | High reach | Low reach |
|---|---|---|---|
| Forward, unobstructed (308.2.1) | Nothing in front | 48" max | 15" min |
| Forward, over an obstruction (308.2.2) | Reach depth up to 20" | 48" max | — |
| Forward, over an obstruction (308.2.2) | Reach depth over 20", up to 25" | 44" max | — |
| Side, unobstructed (308.3.1) | Parallel approach | 48" max | 15" min |
| Side, over an obstruction (308.3.2) | Reach depth up to 10" | 48" max | — |
| Side, over an obstruction (308.3.2) | Reach depth over 10", up to 24" | 46" max | — |
The obstructed rules carry conditions that matter more than the numbers:
- A forward reach over an obstruction needs knee space. Section 308.2.2: "the clear floor space shall extend beneath the element for a distance not less than the required reach depth over the obstruction." A forward reach across a closed base cabinet does not qualify.
- A side reach over an obstruction has a height limit on the obstruction. Section 308.3.2: "the height of the obstruction shall be 34 inches (865 mm) maximum and the depth of the obstruction shall be 24 inches (610 mm) maximum."
A staff kitchen has base cabinets with the counter at 36". The designer notes the lowest shelf of the wall cabinet above as "accessible storage". A wheelchair user approaches parallel to the counter, so this is a side reach over an obstruction. The counter is 36" high. Section 308.3.2 allows an obstruction of 34" maximum. The side-reach-over-obstruction rule cannot be met at this counter height, whatever the shelf height. Raise it as a question: which storage is meant to comply, and where.
Operable parts and hardware
Section 309.4: "Operable parts shall be operable with one hand and shall not require tight grasping, pinching, or twisting of the wrist. The force required to activate operable parts shall be 5 pounds (22.2 N) maximum." Section 309.3 puts operable parts inside one of the 308 reach ranges.
For casework, storage that must comply brings its hardware with it. Section 811.4: storage "Operable parts shall comply with 309." That covers pulls, catches and locks on the accessible units. A small knob that needs a pinch grip, or a lock that needs a twist of a key held between two fingers, is the kind of thing 309.4 describes. Whether a specific product complies is the manufacturer's claim to make. Ask for it in the product data and put the cut sheet in the submittal.
Mark the accessible units on your hardware schedule. If only one of six wall cabinets in a room is the accessible one, the schedule has to say which.
Counters, desks and work surfaces
Work surfaces and dining surfaces (902)
Section 902.3: "The tops of dining surfaces and work surfaces shall be 28 inches (710 mm) minimum and 34 inches (865 mm) maximum above the finish floor or ground." Section 902.2 requires a forward approach with knee and toe clearance under it.
The advisory to 902.1 lists what counts: "Dining surfaces include, but are not limited to, bars, tables, lunch counters, and booths. Examples of work surfaces include writing surfaces, study carrels, student laboratory stations, baby changing and other tables or fixtures for personal grooming, coupon counters". For children, 902.4.2 sets the top at 26" minimum and 30" maximum.
Scoping sits in section 226.1: where dining surfaces are provided, "at least 5 percent of the seating spaces and standing spaces at the dining surfaces shall comply with 902", and where work surfaces are provided "for use by other than employees, at least 5 percent shall comply with 902." Section 226.2 requires them to be dispersed through the space.
The advisory to 226.1 says the 902 requirement "does not apply to work surfaces used only by employees", then adds that employers may still need to adjust "desks, laboratory and work benches, fume hoods, reception counters, teller windows, study carrels, commercial kitchen counters, and conference tables" as a reasonable accommodation. Whether a surface is employee-only is a question for the architect, not a call for the drafter.
Sales and service counters (904)
Reception desks and transaction counters fall under 904.4. Section 227.3: "at least one of each type of sales counter and service counter shall comply with 904.4." Two ways to comply:
| Approach | Accessible length | Height | Other |
|---|---|---|---|
| Parallel (904.4.1) | 36" min | 36" max | Clear floor space for a parallel approach alongside that length |
| Forward (904.4.2) | 30" min | 36" max | Knee and toe space complying with 306 under the counter |
One line in 904.4 changes the section drawing: "The accessible portion of the counter top shall extend the same depth as the sales or service counter top." A shallow ledge tacked onto the end of a deep counter does not satisfy it.
Note the difference between 902 and 904. An exception to section 226.1 says sales and service counters "shall not be required to comply with 902". So a reception desk is not held to 28"–34". It is held to a 36" maximum over the accessible length.
Check-out counters have their own number. Section 904.3.2: "The counter surface height shall be 38 inches (965 mm) maximum above the finish floor or ground", with edge protection 2" maximum above the surface.
Sinks and vanities (606)
Section 606.3: sinks and lavatories go in "with the front of the higher of the rim or counter surface 34 inches (865 mm) maximum above the finish floor or ground." Section 606.2 requires a forward approach with knee and toe clearance. Section 606.5: pipes under the sink "shall be insulated or otherwise configured to protect against contact. There shall be no sharp or abrasive surfaces under lavatories and sinks."
Section 212.3 sets how many: "at least 5 percent, but no fewer than one, of each type provided in each accessible room or space shall comply with 606."
The 606 exceptions allow cabinetry under a sink in residential dwelling units only if three conditions all hold: "(a) the cabinetry can be removed without removal or replacement of the fixture; (b) the finish floor extends under the cabinetry; and (c) the walls behind and surrounding the cabinetry are finished." Each of those is a drafting decision. A removable sink base has to be drawn as removable, the floor finish has to run under it, and the wall behind it has to be finished rather than left as raw board.
Kitchens and kitchenettes (804)
- Clearance between runs. Section 804.2.1: in a pass-through kitchen, clearance "between all opposing base cabinets, counter tops, appliances, or walls within kitchen work areas shall be 40 inches (1015 mm) minimum." Section 804.2.2: in a U-shaped kitchen, 60 inches minimum.
- Storage. Section 804.5: "At least 50 percent of shelf space in storage facilities shall comply with 811."
- Sinks. Section 804.4 sends you to 606.
Measure the 40" or 60" from the finished face of the cabinets, counter edges and appliances on your plan, not from the architect's wall lines. A 25" deep counter drawn where the architect assumed 24" takes an inch off the clearance.
Storage and shelving (811, 803)
Section 225.2: "Where storage is provided in accessible spaces, at least one of each type shall comply with 811." Section 811.3: storage elements "shall comply with at least one of the reach ranges specified in 308." In dressing, fitting and locker rooms, 803.5 is more specific: "Shelves shall be 40 inches (1015 mm) minimum and 48 inches (1220 mm) maximum above the finish floor or ground."
Wall cabinets in corridors
Section 307.2: "Objects with leading edges more than 27 inches (685 mm) and not more than 80 inches (2030 mm) above the finish floor or ground shall protrude 4 inches (100 mm) maximum horizontally into the circulation path." A wall cabinet hung in a corridor or a circulation route, with its bottom edge in that band, is a protruding object. So is an open shelf or a display ledge. Check your elevations against the architect's circulation paths.
Tolerance: why 34 means 34
Section 104.1.1: "All dimensions are subject to conventional industry tolerances except where the requirement is stated as a range with specific minimum and maximum end points." The advisory adds: "Recognized tolerances are not intended to apply to design work."
Two consequences for your set. First, 902.3 is a range, 28" to 34", so there is no tolerance on it: 34 1/8" fails. Second, you do not get to design to the limit and hope the floor behaves. Design to a number that still complies after shimming.
The Woodwork Institute's sample shop drawings include three teaching wall sections. Each section dimensions the base cabinet at 32" above the floor, adds a 1 1/2" top for 33 1/2" to the work surface, and carries the note SHIM TO 34" MAX. A.F.F. The sheet's general note adds: 4" HIGH TOEKICK MAY INCREASE W/ SHIMMING DEPENDING ON JOB SITE FLOOR CONDITIONS.
That leaves exactly 1/2" of shim before the top reaches 34". The Architectural Woodwork Standards, 2nd Edition, Section 10, uses the same figure for shimming: "shimming of the toe base, not to exceed 1/2" (12.7 mm), is acceptable. Floor variations exceeding 1/2" (12.7 mm) shall be corrected before cabinets are installed". The two numbers line up. Whether the sample's drafter set them up on purpose is not stated on the sheet, but the method is right: state the design height, state the limit, and state who absorbs the floor.
Where a designer's drawing will not comply until you say so
These are the patterns to look for when you first read an architect's set. Each one is a question, not a fix you make quietly.
- Counter heights given as "standard". A 36" counter cannot be an accessible work surface under 902.3, which caps at 34". In a dwelling unit that must comply with 809, the kitchen work surface under 804.3.2 also caps at 34".
- Knee spaces drawn without depth. An elevation shows an opening. Only a section shows whether 306 is met.
- Accessible reception counters drawn shallow. 904.4 wants the accessible portion at the same depth as the rest.
- Wall cabinet shelves labelled "accessible" over a 36" counter. See the side-reach worked example above.
- Sink bases in commercial toilet rooms. The residential cabinetry exception in 606 does not help outside residential dwelling units.
- Pedestal desks with narrow knee openings. See 305.7.
- Corridor casework. See 307.2.
- Local additions. The Woodwork Institute sample's cover sheet includes the line "ALL CABINET CONSTRUCTION SHALL COMPLY TO TITLE 24 CALIF. BUILDING CODE", and its specification sheet carries a "TITLE 24 REQ.: YES / NO" box. A state code can add requirements the ADA does not. If a job sits under one, the spec should say so, and your cover sheet should repeat it.
What to put on the drawings
- Tag the accessible units. On plan and elevation, mark which counter length, which sink base, which wall cabinet, which desk is the accessible one. Use a symbol and define it in the legend.
- Dimension from finish floor. Every accessible height is "above the finish floor or ground" in the ADA text. Write A.F.F. and dimension from it, not from the top of the toe kick or from a slab.
- Show the envelopes in section. Knee and toe clearance as a dimensioned zone. Reach range lines on the elevation, if the job has accessible storage.
- Cite the section. A note like WORK SURFACE 34" MAX A.F.F. PER 2010 ADA 902.3 tells the reviewer what you were checking against, and tells the installer why the number is not negotiable.
- State the shim limit. As the Woodwork Institute sample does.
- Put the hardware claim in the submittal. A cut sheet for each pull, catch and lock on an accessible unit.
- Send the conflicts as RFIs. Where the architect's drawing and the code disagree, the architect decides. Your record shows you asked.
Private homes
A residential kitchen for a private client is generally outside the ADA. The Department of Justice regulation published with the Standards says: "When a commercial facility is located in a private residence, the portion of the residence used exclusively as a residence is not covered by this subpart, but that portion used exclusively in the operation of the commercial facility or that portion used both for the commercial facility and for residential purposes is covered". A home office that receives clients can fall on the covered side of that line. If the job is a residence with a business use, ask.
Other residential rules, such as fair housing requirements for multi-family buildings, are outside the scope of this chapter. The 2010 Standards themselves refer to units built by entities under HUD regulations (section 233.2). If the job is multi-family housing, find out which rules apply before drawing a single kitchen.
Sources
- US Department of Justice, 2010 ADA Standards for Accessible Design, ada.gov/law-and-regs/design-standards/2010-stds/, opened 21 September 2026. Every ADA section quoted above: 104.1.1, 212.3, 225.2, 226.1 and its advisory, 226.1 exceptions, 227.3, 233.2, 305, 306, 307.2, 308, 309, 606, 803.5, 804, 811, 902, 904, and the private-residence provision. Primary.
- Architectural Woodwork Standards, 1st Edition (2009), Section 10, Casework, © AWI, AWMAC, WI, public web copy hosted by the Woodwork Institute. Design professional's duty to coordinate accessibility requirements. Superseded; quoted for the allocation of responsibility only. Primary (superseded edition).
- Architectural Woodwork Standards, 2nd Edition (1 October 2014), Section 10, Casework, introductory pages, © AWI, AWMAC, WI, hosted by the Woodwork Institute. The 1/2" toe-base shimming limit. Superseded. Primary (superseded edition).
- Woodwork Institute, sample shop drawings (26 sheets, watermarked SAMPLE, fictitious names). Teaching wall sections with "SHIM TO 34" MAX. A.F.F.", the toe kick shimming note, the Title 24 note and box. Document.
Dropped for lack of an opened source: specific figures from state codes, ICC A117.1, the Fair Housing Act design requirements, and accessibility standards outside the US.