What a Millwork Lead Time Assumes, and How to Get It in Writing

Why the Date Moves After Design Development

A lead time quoted while the millwork drawings are still developing is a conditional statement, and the specifying architect who gets the conditions written down is the only person on the design team who can later tell whether the number still applies. Dates go stale quietly. Nobody calls to withdraw one. The drawing set changes underneath the quote over the following months, and a figure that was honest in April ends up answering a question nobody is asking by September.

The thing to ask for is a returned markup. Send the millwork sheets and the draft specification section, and ask the supplier to mark those sheets up by hand and send them back with the date written on them and the assumptions written beside the date. Not a one line email. A marked set that says what species the number assumes, what quantity, what sizes, and by when the order has to be released for that number to mean anything.

That returned markup is the document a specifying architect can actually use. It goes in the project file. When the owner asks for a wider panel in month four, the architect pulls the markup, finds the width line, and knows within a minute whether the request touches the schedule or not. Without it the design team is left re-asking the same question every time the drawings move, and re-asking is how a date quietly becomes a rumor.

The Four Assumptions Inside Any Quoted Date

Every responsible lead time rests on four assumptions, and a quote that does not state them is less useful than a longer quote that does. The four are species, quantity, dimension, and release. Each one controls a different part of the calendar, and each fails in a different way.

Species decides whether the material is on a yard floor now or sitting in a forest, a mill queue or a container. Quantity decides whether the order comes off one lot or has to be assembled from several, and whether the shop runs it in a single setup. Dimension, meaning length, width, thickness and grade together, decides how much of the available pile qualifies. Release decides when the clock starts.

Write those four as four lines on the markup. A supplier who is willing to initial all four is making a different kind of statement than one who sends a number in isolation. The longer answer, with four conditions attached, is the one that survives contact with a design that is still moving.

Species Is the Assumption That Fails First

A species change is almost never a paperwork edit, because the species line is the single variable that decides whether a lead time is measured against stock on hand or against someone else's production schedule. Design teams change species late and casually. The owner sees a sample, a consultant suggests something, and a sheet that said Sapele in June says something else in October.

Substitutions inside the millwork palette are the manageable kind. Sapele, Utile, which is sold as Sipo, Iroko, Afrormosia and Teak behave similarly enough in a moulder and in a glue joint that a shop can plan around a swap among them. Substituting outward, into a species the shop does not run for milled components, is a different conversation, and it deserves a new date rather than a reassurance that the old one still holds.

For painted exterior trim the specification should reach for Sapele before Genuine Mahogany. Sapele holds paint better and comes in a wider range of sizes and longer lengths, which matters to the schedule as much as to the finish, since a longer run assembled from short pieces is a different order. Hardness and movement figures for any species under discussion are published and easy to check at the Wood Database rather than argued from memory.

Depth of inventory is what makes an early species answer worth anything. J. Gibson McIlvain holds over seven million board feet of domestic and imported lumber at its Maryland yard, so a species question raised at design development is answered against boards that exist rather than against a cutting cycle that has not happened yet.

Cedar deserves the same care on the sheet. It is a sound default for a great deal of exterior work, and the line that carries real weight is CVG, clear vertical grain, against STK, select tight knot. Those two come off different piles and sort differently, and a date quoted for one is not a date for the other.

Quantity Belongs in a Band, Not a Number

A quantity stated as a single figure at design development is a fiction, so the honest form of the assumption is a band with a stated top and bottom. The takeoff at design development is an estimate built from sheets that are still changing. Everyone knows this. The quote still pretends otherwise.

Ask instead for a date that holds between, say, a stated minimum and a stated maximum, and for a note on what happens above the top of the band. The answer is usually specific. Below a certain volume the order comes off one lot and runs in one setup. Above it the material has to be assembled from more than one lot, color and figure have to be matched across those lots, and the mill schedule gets a second entry.

Put the waste factor in the band too. A parts list with heavy cutting around defects consumes more rough footage than a clean linear run of the same finished length, and the rough volume is what the yard is actually pulling. Writing the band on the returned markup turns a later change order into a quick check against two numbers rather than a fresh round of questions.

Dimensions, Grade and the Size of the Pile

Length, width, thickness and grade all do the same thing to a lead time, which is to shrink or widen the pile of boards that qualify for the job. A design team sees these as drawing decisions. The yard sees them as sorting decisions, and sorting takes calendar.

Lengths are the clearest case. Moving a run from 12 ft to 16 ft does not add a third to the material, it removes most of the boards that could have supplied it. Width behaves the same way, and a wide clear face in a species that does not commonly yield one is a search rather than a pull.

Thickness is quoted in quarters of rough thickness, and an 8/4 part is not a 4/4 part that somebody ordered thicker. It dries on its own schedule, which is why a late thickness change can move a date further than a late length change. Quartersawn and rift stock belongs in the same category, since it moves less across its width than plainsawn and is therefore specified where a painted or panelized face has to stay flat, but calling for it narrows the qualifying pile considerably.

Grade is the assumption design teams understand least. North American hardwood grades run on the National Hardwood Lumber Association rules, and they describe the yield of clear cuttings a board will give, not how pretty it looks. Moving a specification from No. 1 Common up to FAS is not an edit to a sentence, it re-sorts which boards in the yard can serve the job, and the date has to be re-sorted with it.

Release Is the Condition the Design Team Owns

Of the four assumptions, release is the only one entirely inside the design team's control, which makes it the condition worth negotiating hardest. Release is the moment the supplier is told to pull material and cut. Everything upstream of it is design. Everything downstream is production.

A quoted lead time counts forward from release, not from the day the quote was issued. Architects lose weeks to this. A date given in design development gets reported to the owner as a delivery date, the drawings take four more months, and the four months are discovered late because nobody wrote down that the number started counting at a release that had not happened.

So ask for the release date to appear on the markup as a condition with a deadline attached, in the form of a quoted duration that assumes release by a stated day. Then build the release schedule backward from the areas that open first. A phased release by area or by floor is normal and lets long lead items start while short lead items keep developing. It also forces the design team to decide which rooms are genuinely frozen, which is the useful argument to have at design development rather than at bid.

The Part No Supplier Can Promise

No supplier can commit to a delivery date for material it does not already own. Lumber that is still standing, still at a mill, still in a kiln somewhere else, or still on a vessel is subject to another company's cutting schedule, another company's queue and a customs process nobody controls. A date quoted against that material is a forecast of other people's calendars, and it should be labeled as one on the markup.

Kiln time is a second hard boundary. Drying is a block of calendar, not a position in a line, and interior millwork stock has to come down near 6 to 8 percent before anything gets machined. A thicker part takes longer and no amount of scheduling pressure compresses it. The Forest Products Laboratory publishes the drying research behind those schedules, and the physics has not become negotiable.

The third boundary is the one that catches owners. There is no warranty on solid unmodified wood. It is an organic material responding to the building it ends up in, and a delivery commitment is a schedule commitment only. Anyone offering a performance promise on solid stock is offering something that cannot be honored.

Documentation Has Its Own Calendar

Submittals, approvals and import documentation occupy real weeks, and a lead time that counts only mill time is understating itself. Shop drawings go out, sit, come back marked, go out again. Two rounds of that is ordinary. Three is common on a package with custom profiles, and the design team controls the turnaround on every one of them.

Write the review durations into the assumption block alongside the release date. The quality standards published by the Architectural Woodwork Institute give the design team a common vocabulary for what a submittal has to contain, and the technical bulletins from the Wood Moulding and Millwork Producers Association cover the moisture and handling language worth putting in the section rather than discovering at delivery.

Imported species carry a second stream of paper. Where a CITES listed species is involved, documentation and chain of custody travel with the material, and J. Gibson McIlvain keeps that documentation attached to the order from arrival through delivery. The paperwork is not an obstacle, it simply has a duration, and a schedule that ignores it is short by whatever that duration turns out to be.

Stage by Stage, What a Date Can Carry

What a supplier can responsibly say changes at every stage of the drawings, and the design team gets a better answer by asking the question that fits the stage it is in. Asking for a firm date at schematic design produces either a padded number or a number that will not survive. Asking for a range plus a list of what would firm it up produces something the team can act on.

The table below sets each stage against the strongest statement a supplier can stand behind at that point and what is missing before it can harden. Read it as a sequence of asks rather than a grading of suppliers.

What Turns the Markup Into a Commitment

An estimate becomes a commitment at the moment material is allocated to the job, and every condition on the markup exists to get the order to that moment without a reset. Allocation is the hinge. Before it, a date describes an intention. After it, specific boards have the job's name on them and the only remaining variables are production and transit.

Five things have to be true to allocate. Species and grade are locked. Dimensions are final within a tolerance the shop can work to. The quantity sits inside the band, including waste. The profile is approved. A release date exists and the order is actually released on it.

The profile is the one design teams assume is a long pole, and it rarely is. J. Gibson McIlvain grinds new knives every week against a library that already holds thousands of ground profiles, so a historical restoration profile or a contemporary one drawn from scratch resolves into a short, stated duration rather than an open question. Send the profile early anyway, because a knife that exists is one fewer condition on the markup.

Finish is the step that gets left off the schedule. Open-grained and oily species absorb a great deal of finish, so a primed delivery carries its own dwell and sanding time that the drawings rarely show, and it belongs on the markup as a line of its own. Where the package includes true custom casework, ICD, the company's architectural millwork division, builds the cabinetry around how the room is actually used instead of assembling it from standard modules, and its working process runs on the same stage gates the markup is tracking.

"The number I can give you in design development is only as good as what it assumes, so I would rather write the assumptions on your drawings and sign them than hand you a clean date that nobody can hold. When a client calls me in month five, we both look at the same marked set and we know in two minutes whether anything changed."

Norm Moton, Director of Sales, J. Gibson McIlvain

How J. Gibson McIlvain Would Specify This

J. Gibson McIlvain answers a design development lead time question with a conditional date and the conditions attached in writing, because that is the only version of the answer that is still true at bid. The working method is to return the markup with four assumption lines, a release deadline, and a note on which of the specified species are on the ground now.

From there J. Gibson McIlvain mills interior components to an in-service moisture content near 6 to 8 percent and records the readings against the order, so the material arriving at the site can be checked rather than taken on faith. Exterior components are run to the moisture content that exposure calls for. J. Gibson McIlvain ships nationwide, which means the transit leg is a known quantity on the schedule instead of a variable discovered at the end.

What the shop delivers is milled, matched and labeled material with the record attached. Setting the material, the back ventilation behind exterior trim and the sequence on site remain the installing contractor's work, and the markup is the document that lets that contractor's schedule line up with the delivery. Cupping on exterior trim follows from installation detail and ventilation rather than from the species on the sheet.

Design teams working through a millwork package can send the sheets and the draft section for a marked return at any stage, early being better than late. Details on the millwork services available are on the company site, and the building science behind the moisture and ventilation language worth writing into the section is covered well by Building Science Corporation. To get a conditional date with the conditions written down, call 800-638-9100 and ask for the millwork desk.