A fenestration takeoff checklist

Most bad window and door quotes come down to a missing field. A takeoff counted every unit but never wrote down the handing, say, or nailed the handing and missed the glazing spec entirely. That gap shows up later as a remake, a back-charge, or an argument about whose job it was to catch it in the first place. A takeoff is only complete once every unit carries every field the quote actually depends on. Below is that list, field by field, along with where each one tends to hide.

The unit fields

Mark. This is the unit’s identity: W1, D3, whatever convention the architect is using. Marks go wrong two ways: the same mark shows up with different attributes on the schedule versus the elevations, or marks get renumbered somewhere between revisions without anyone flagging it. Write the mark down exactly as drawn. If the same mark appears twice with two different sizes, resolve that conflict out loud instead of quietly picking one.

Quantity. Count from the elevations and reconcile against the schedule’s count column, not the other way around. Schedules routinely say “see elevations” or carry a stale count from three revisions back. Watch for typicals (“TYP.” multiplies, but by how many?) and mirrored plans, where the same elevation serves two units and the openings double without appearing twice on paper.

Size. Know which size you’re actually reading: unit dimension, rough opening, or masonry opening. A schedule that mixes these, or an elevation dimensioned to the rough opening while the schedule lists unit size, will produce units that don’t fit. If the set never specifies which convention it’s using, don’t assume. Ask the architect directly.

Operation. Casement, awning, hung, slider, fixed: the schedule usually states it, and the elevation symbol sometimes disagrees. When the operation symbol on the drawing conflicts with the operation column in the schedule, flag it. Operation drives price, hardware, and code-required egress all at the same time.

Handing. Left or right, viewed from a particular side, and the convention differs between window people and door people, and sometimes between the architect and both of them. Record the handing and the convention the drawing is using. A reversed handing is the classic silent remake: everything about the unit is correct except which side it opens from.

Glazing. Glass spec is money. Tempered where code requires it, low-E coating, obscure glass in bathrooms, impact rating where the wind zone calls for it. The schedule’s glazing column is frequently incomplete, so check the general notes and the wall sections too, since glazing requirements often live there instead.

Frame and finish. Material, exterior color, interior finish. Usually specified once in the general notes (“all windows to be…”) and then contradicted for specific units somewhere in the schedule remarks. The remarks column wins when that happens, so read it for every unit, not just the ones that look unusual.

Egress. Bedrooms need egress-compliant openings, and a change to operation or size that looks minor can quietly break compliance. Mark which units are egress-critical while you’re doing the takeoff. Swapping one out later without checking is how code violations happen quietly.

The document checks

The fields above live on units. These checks live on the plan set itself:

1. Check the schedule against the elevations in both directions. Every mark in the schedule should appear on a drawing, and every opening drawn should appear in the schedule. Do it both ways, since each direction tends to catch a different kind of miss.
2. Sweep the revisions. Make sure you’re counting the latest revision of every sheet, and check the revision block itself: a revised schedule paired with unrevised elevations, or the other way around, is exactly where mismatches start.
3. Read the notes and sections. General notes, wall sections, and door and window details often carry requirements, like glazing or flashing or install conditions, that never make it into the schedule but still belong in the quote.

The pricing pass

A complete field set still has to turn into a number. Map each unit to your catalog explicitly, and when you’re forced into a “closest product” substitution, put it in the quote as a named alternate instead of swapping it in silently. Write down what you left out too. If the takeoff doesn’t cover install, flashing, or interior trim, say so somewhere the buyer will actually read it.

Print it

The version that fails is the one that only lives in an estimator’s head and disappears the week they’re on vacation. Below is the short version: no explanations, just the boxes. Print it, keep it by the monitor, tick as you go.