How to Choose a Lumber Grade for Each Part of a Furniture Project

Most furniture project budgets get blown in the same place: somebody bought FAS hardwood for the entire bill of materials when only one third of the project would ever show on the outside of the finished piece. This guide walks through how to assign a grade per part of the project before you go to the yard, and how that single planning step usually cuts the lumber cost by 20 to 40 percent without changing the finished result.

The technique is not woodworking-magic. It is just doing the breakdown that the National Hardwood Lumber Association grading system was designed for in the first place.

Step 1: Build a per-part bill of materials

Before you pick grades, you need a list. For each component in the piece, write down:

• Name (top, side panel, drawer front, drawer side, drawer bottom, back panel, leg, stretcher, etc.)
• Finished dimensions in inches (thickness, width, length).
• Whether it will be visible in the finished piece (yes, partial, or no).
• Whether the part has a continuous grain or can be made from shorter cuts.

This is the planning step that gets skipped. It looks like overhead until you do it once and watch how much money it saves. The bill of materials is also what you bring to the yard, so the helpful person at the desk has something concrete to look at.

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Step 2: Group parts into three visibility tiers

Sort the parts into three buckets:

• Tier 1: Show parts. The top, the visible front and side panels, drawer fronts, the parts a person sees and runs a hand across.
• Tier 2: Partial-show parts. Drawer sides that are visible only when the drawer is pulled, the upper rear panel on a hutch, the inside faces of side panels.
• Tier 3: Hidden parts. Drawer bottoms, back panels, runners, hidden stretchers, glue blocks, anything covered by hardware or another component.

That sort is the entire grading decision in one step.

Step 3: Assign grades by tier

Now match each tier to a grade.

Tier 1 (Show parts). Specify FAS or Selects for hardwood; Clear or C&Better for softwood appearance grades. You want long, clear, defect-free material here because every defect will be visible after finish. The price premium is real but small relative to the project, because the show parts are usually a minority of the total board feet.

Tier 2 (Partial-show parts). Specify No. 1 Common for hardwood; equivalent appearance grades like D&Better for softwood paneling. You can plan around occasional small knots, pin knots, or color variation because the part is only partially visible. The yield from this grade is high enough that the cost savings beat the cutting-around cost.

Tier 3 (Hidden parts). Specify No. 2A Common for hardwood; equivalent utility appearance for softwood. These parts will never be seen, and any species-appropriate wood works fine. You can even mix species here if the strength values match the application.

The savings come from Tier 3 in volume and from Tier 2 by sheer surface area. Tier 1 stays expensive because it should. Background on what the tiers actually mean is in the Wikipedia article on lumber and on the American Lumber Standard Committee site for softwood.

Step 4: Apply defect allowances per grade

Each grade carries an expected yield from raw material to finished material. A defect allowance lets you order the right amount of raw board feet up front.

• FAS / Selects: 5 to 10 percent defect allowance. The board face is mostly clear; you lose a small amount to end trims and the occasional unusable strip.
• No. 1 Common: 25 to 35 percent allowance. You will plan around several knots per board and want to cut into shorter pieces to capture clear runs.
• No. 2A Common: 40 to 55 percent allowance. Significant defects, suitable when the project parts are short and the cuts can be selective.

For each tier, compute the purchased board feet as finished board feet multiplied by 1 plus the defect allowance. Sum across the project.

This is also where having a free board foot calculator by EvvyTools pays for itself. You enter raw dimensions and species, get a board foot total plus a weight estimate, and avoid the classic mistake of estimating board feet from finished part dimensions and then being short at the saw.

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Step 5: Sanity-check the project total

Before placing the order, run two sanity checks.

The clear-yield check. For Tier 1 parts, the longest continuous grain run you need has to fit inside the average FAS board length at your yard. If the yard's FAS pile is 6 to 8 foot boards and your longest top piece is 7 feet, you should know that before you arrive. If the boards are shorter than your longest part, you need a longer-length FAS request or a different yard.

The weight check. Multiply purchased board feet by species weight per board foot. The board foot calculator does this automatically when you select a species. The number is what you actually have to carry, load, and store. A truck bed that handles 400 pounds of pine handles 600 pounds of oak very differently.

Step 6: Communicate the spec to the yard

When you arrive, give the yard the bill of materials grouped by grade. The conversation gets much shorter:

• "I need about 28 board feet of FAS walnut, longest pieces around 5 feet."
• "I need about 60 board feet of No. 1 Common walnut, shorter cuts are fine."
• "I need 25 board feet of No. 2A Common in any species you have at a good price; it is all going inside drawers."

A yard that hears that level of spec treats you like a working customer. A yard that hears "I am building a dresser" gives you whatever they want to move off the rack today.

A common mistake to avoid

The mistake that ruins this approach: buying FAS for the entire bill of materials because the lower grades "looked too rough." The lower grade did its job; it represented worse face yield, not worse wood. Cut into the right places, it produces the same clear material at a lower price per usable foot. If you find yourself talking yourself into one grade for the whole project, the breakdown above is the antidote.

The other common mistake: forgetting moisture status. KD-HT (kiln-dried, heat-treated) lumber moves less after purchase than S-GRN (surfaced green), and that matters a lot for tight joinery. Both grades and moisture statuses show up in the Wikipedia article on hardwood basics and on most yards' bundle tags.

Wrap-up checklist

• Bill of materials per part with finished dimensions and visibility.
• Three-tier visibility sort.
• Grade assigned per tier.
• Defect allowance per tier.
• Purchased board feet computed and run through a calculator.
• Weight check for transport.
• Yard conversation grouped by grade.

For the longer guide on what each grade tier actually means and how the stamps decode, the hub article on reading lumber grade stamps and price tiers covers the rest of it.

The whole project breakdown takes maybe an hour to plan. The yard visit gets shorter. The bill gets smaller. The finished piece looks the same. That is the entire trade.

For more project math like this, the EvvyTools tools directory carries the related calculators and reference data.