Part I · The job · Chapter 1
What millwork is
Custom woodwork made in a shop for one building and fixed in place. Where millwork ends and furniture and carpentry begin, and why the UK calls it joinery.
8 min read
Millwork is woodwork made in a shop, for one building, and fixed into it. A reception desk, a run of cabinets, a panelled wall, a store fixture, a stair. Each piece is drawn for one opening, built away from the site, then carried in and fixed. That sequence is the whole reason your job exists.
Nobody hands a new drafter a definition. You get a job number and a PDF. This chapter gives you the boundaries first, because every later decision depends on them: what you draw, what you leave to someone else, and which words to search for when you need help.
Three tests
A piece of woodwork is millwork when it passes three tests.
- It is made in a shop. Machines cut, shape and assemble it away from the building.
- It is made for one place. The size, shape and finish answer one set of architect's drawings, not a catalogue.
- It is fixed. Once installed it belongs to the building. It is screwed to blocking, scribed to a wall, or sits on a base that is part of the room.
Fail the first test and the work is site carpentry. Fail the second and it is a stock product. Fail the third and it is furniture. Each of those is a different trade, with different drawings, and often a different contract.
What the official classification says
The clearest boundary lines come from an unlikely place: the North American Industry Classification System (NAICS), which the US, Canada and Mexico use to sort businesses for statistics. It has to decide where every woodworking shop belongs, so it draws the lines precisely.
| Code | Title | What it covers, in the classification's words |
|---|---|---|
| 337212 | Custom Architectural Woodwork and Millwork Manufacturing | "custom designed interiors consisting of architectural woodwork and fixtures utilizing wood, wood products, and plastics laminates. All of the industry output is made to individual order on a job shop basis and requires skilled craftsmen as a labor input." |
| 321918 | Other Millwork (including Flooring) | Factory millwork: mouldings (base, chair rail, crown, shoe), ornamental woodwork, stairwork, shutters, flooring, and "planing mills, millwork". |
| 321911 | Wood Window and Door Manufacturing | Window and door units, sash, frames and doors, made in a factory. |
| 337110 | Wood Kitchen Cabinet and Countertop Manufacturing | Kitchen cabinets, bathroom vanities and countertops "(except freestanding)", on a stock or custom basis. |
| 238350 | Finish Carpentry Contractors | Work done at the building: "Built-in wood cabinets constructed on site", "Millwork installation", trim and paneling installation. |
The examples NAICS gives for a custom millwork job read like a commercial drafter's year: "display fixtures, gondolas, wall shelving units, entrance and window architectural detail, sales and reception counters, wall paneling, and matching furniture."
Three things follow from that table.
- "Millwork" means two different businesses. One makes stock mouldings, doors and stair parts in volume. The other makes one-off interiors to order. This book is about the second. When a supplier says "millwork" and means a catalogue of casings, the word has not changed; the business has.
- The line between shop and site is official. NAICS sends "fabricating millwork at the construction site" to finish carpentry contractors. The same cabinet is millwork when a shop builds it and carpentry when someone builds it in the room.
- The name points at the mill. The classification still lists "planing mills, millwork" as an example of the industry.
Millwork and furniture
A reception desk and an office desk can use the same board, the same edge banding and the same hinge. The difference is not the material. It is the relationship to the building.
| Question | Millwork | Furniture |
|---|---|---|
| Where does it go? | One opening, in one room, in one building | Anywhere it fits |
| How is it sized? | From the architect's drawings and field measurements | From a product range |
| How is it held? | Fixed to walls, floors or ceilings | Stands on its own |
| Who approves it? | The design professional, through a submittal | The buyer, from a catalogue or sample |
| What is drawn? | Plans, elevations, sections, attachment details | Product drawings, usually once, for many units |
The edges blur, and the drawings show where. The NAICS example list for custom millwork includes "matching furniture". The 16-sheet residential submittal used throughout this book includes a floating bar: a free-standing unit, drawn in plan, front, rear and end elevation on its own sheet. It is furniture by the third test. It sits in a millwork set because the same shop builds it to match the room, and the client approves it on the same stamp.
When a free-standing piece lands in your set, draw it like millwork. Give it a plan location, and show how it meets the floor, even if the answer is "it does not".
Millwork and carpentry
Site carpenters and millwork shops both work in wood, both install doors and trim, and both build cabinets. The split is where the making happens.
England's apprenticeship standard for carpentry and joinery (ST0264, Level 2) makes the split in one pair of sentences. A site carpenter works "on a building site or in domestic and commercial premises" and will "prepare and install basic building components". An architectural joiner works "in a workshop" to "produce building components by setting out, marking out and manufacturing basic architectural products, including doors, windows, straight staircases and associated ironmongery".
That is the same line NAICS draws. It matters to you for a practical reason: whatever the shop cannot finish, the site has to. Every scribe, filler and cut-out left off your drawing becomes site work. The site has the architect's dimensions, the real wall, and no machine shop.
Millwork and joinery: one trade, two words
In the United States and Canada the trade is millwork, or architectural woodwork. In the United Kingdom it is joinery, and the shop is a joinery shop. The apprenticeship standard above calls the maker an "architectural joiner". An outsourcing vendor's blog on millwork drawings uses "millwork and joinery design" as a single phrase and describes a job for "a joinery designer and manufacturer in the UK".
The drawing job has its own British word too. A UK joinery textbook for the Level 2 NVQ/SVQ Diploma defines the setter out as "an experienced bench joiner whose job is the setting out of joinery products". From scale drawings, the specification and site measurements, the setter out draws full-size horizontal and vertical sections on a setting out rod: a thin sheet of plywood, hardboard or MDF, often painted white. The rod carries the sight size, shoulder size and overall size as checks. It is a shop drawing at full size.
Why this matters to a new drafter: much of the useful writing about the trade uses the other word. Search both.
| North America | United Kingdom |
|---|---|
| Millwork, architectural woodwork | Joinery |
| Millwork shop | Joinery shop |
| Millwork drafter, detailer | Setter out |
| Shop drawings | Setting out drawings, rods |
| Hardware | Ironmongery |
In North American drawings "joinery" can mean the joints themselves: dowels, dados, rebates. The Woodwork Institute's sample set uses it that way, with sheets titled "Typical joinery details" and a floor-plan note that a shop drawing must include "cabinet joinery details". A British reader sees the whole trade in the same word. When a drawing crosses the Atlantic, check which meaning the writer had.
What counts as millwork
The Architectural Woodwork Institute (AWI) splits the trade into product standards, and the list is a fair map of what a millwork shop draws. AWI's standards page, read 21 September 2026, lists separate standards for:
- Architectural wood casework (cabinets, veneer-faced and plastic-laminate-clad)
- Manufactured wood casework
- Specialty casework
- Countertops
- Millwork and wood trim
- Wood paneling
- Wood stairs, handrails and guards
- Historic restoration of architectural woodwork
- Factory finishing
- Finish carpentry and installation
AWI's casework standard places its products under the construction specification numbers 06 41 00 (Architectural Wood Casework), 06 41 13 (wood-veneer-faced cabinets), 06 41 16 (plastic-laminate-clad cabinets) and 06 41 93 (cabinet and drawer hardware). Those numbers come from CSI MasterFormat, the filing system for project specifications. Learn them. When you open a specification book to find what your job requires, Division 06 is where you start.
The two real sets in hand show the range. The residential submittal covers a club room and a study: wall units, a bar, glazed cabinets, stone-topped bases, and the floating bar. The Woodwork Institute sample runs from a key plan of a two-storey office building through base and wall cabinets to a stair section, a ceiling layout and a transaction counter drawn to "premium grade construction". Same trade, same conventions, very different buildings.
What millwork is not your job
A millwork set sits among other trades' work, and the drawings mark the boundary on every sheet. The residential set labels the television "BY OWNER" and the stone tops, plumbing and appliances "BY BUILDER". The Woodwork Institute sample's general notes say plumbing and fixtures, electrical and fixtures, painting and finishing, and "all blocking for cabinet anchorage" are "by others". Its commercial sheets mark the gypsum board, rough carpentry and pipe railings "(BY OTHERS)".
Those labels are not decoration. Each one tells a reader where your scope stops and someone else's starts. Chapter 3 covers who those others are.
Why it matters on your first day
Every idea above turns into a drawing decision:
- Shop-made means machined. Your drawings feed a saw, a CNC router and an edge bander. A dimension you round becomes a part cut wrong.
- Made for one place means field conditions. Walls lean, floors slope and openings arrive a few millimetres off. Your set has to say what was measured, what was assumed, and where the scribe goes.
- Fixed means attachment. Every piece hangs on something. AWI 100 requires "details showing method of cabinet attachment to walls and floors" and blocking locations with heights above finished floor. Furniture drawings never need that. Yours always do.
- Two words means two libraries. Search "millwork" and "joinery" both, and your reading doubles.
Sources
- US Census Bureau, North American Industry Classification System, United States, 2022 (census.gov/naics, 2022 NAICS Manual PDF), entries 32191, 321911, 321918, 337110, 337212 and 238350. Definitions, examples and cross-references quoted above; the split between factory millwork, custom millwork and site finish carpentry. Primary.
- Institute for Apprenticeships and Technical Education (now Skills England), Carpentry and Joinery apprenticeship standard ST0264, Level 2, skillsengland.education.gov.uk. The site carpenter and architectural joiner role descriptions. Primary.
- Pearson, Level 2 NVQ/SVQ Diploma Carpentry and Joinery, 3rd edition, Unit 2034 "Know how to produce setting out details for routine joinery products" (publisher's sample chapter PDF). Definition of setter out; setting out rods; sight, shoulder and overall sizes. Document (published textbook).
- Architectural Woodwork Institute, standards list, awinet.org/standards, read 21 September 2026; ANSI/AWI 0641-2019 Architectural Wood Casework, Foreword and 2.0 Scope (MasterFormat numbers); AWI 100 – Submittals, §3.2.3.1 (attachment and blocking requirements). Primary.
- Woodwork Institute, Sample Shop Drawings, 26 sheets, watermarked SAMPLE, fictitious names. "Joinery details" usage, general notes on work by others, range of products. Document.
- A residential millwork submittal, 16 sheets, revision 0, SUBMIT FOR APPROVAL. Floating bar sheet; "BY OWNER" and "BY BUILDER" labels. Not reproduced: live job. Document.
- Ripudaman Singh, "Essential Details You Should Look For in Millwork Drawings", hitechdigital.com, 2 July 2024, an outsourcing vendor's blog. Used only as evidence that the trade uses "millwork" and "joinery" as one subject. Claimed.