How to Specify Lumber for an Accurate Supplier Quote

Define the application and specification

Start with the application

State whether the wood will become furniture, interior millwork, flooring, exterior cladding, decking or a structural member. Describe wetting, ground contact, coastal exposure and whether the finished work will be indoors in a conditioned room. A harder species is not automatically more durable or suitable for structural use.

Give suppliers a complete order description

Include species or permitted species group; grade and grading system; quantities and billing unit; rough or finished thickness; minimum usable widths and lengths; surfacing; acceptable defects; moisture requirements; and delivery location. Ask for the supplier's measurement convention and whether pricing is based on rough or surfaced dimensions.

For fixed-size parts, provide a cut list. Random-width, random-length stock is not a substitute for guaranteed part recovery. Require written approval before species, grade, treatment or product substitutions.

Explain what evidence you need

Ask which grade stamps, treatment tags, certification claims and technical documents will accompany the order. Listing a company in a directory does not verify its stock, certification or ability to meet your specification. Start with the species library and lumber grades, then confirm the order with the supplier.

Annotated purchasing requests

Hardwood furniture request: example, not a universal specification

Please quote 100 board feet of kiln-dried white oak, FAS under the applicable NHLA rules, rough 4/4 stock. Our cut list needs clear finished parts 3/4 inch thick, with the attached minimum widths and lengths. Please state the delivered rough thickness, expected surfaced thickness, measurement convention, moisture readings and measurement method, milling options, freight and lead time. Quote any alternative grade separately; do not substitute without approval.

The finished thickness and part sizes drive stock selection. FAS is helpful for larger clear parts but does not promise that every requested part will fit every board. Set the moisture acceptance range from the intended service environment and manufacturing process, not a copied universal percentage.

Framing request

Please quote the quantities and lengths in the attached schedule, in the species group and structural grade specified by our approved plans. State the grade-marking agency, moisture designation, delivered dimensions, treatment if required, lead time and delivery charges. Any species, grade or engineered-product substitution requires review before shipment.

Do not infer an allowable beam or joist span from this example. Use the applicable code, design values, loads, spacing, deflection limits and approved plans. See the framing comparison.

Exterior ground-contact request

Please quote the scheduled posts and lengths for the stated ground-contact exposure. Confirm the required AWPA use category for this application, preservative, retention, quality marks, field-cut treatment instructions and compatible connectors. Quote more severe-exposure alternatives separately if the application requires them.

UC4A is general ground contact; severe or critical uses can require a higher category. Marine applications need their own specification, not a generic ground-contact label.

Dimensions and machining allowances

Nominal size versus delivered size

A standard dry surfaced 2×4 typically measures 1½ × 3½ inches, but rough, green and specialty products differ. Four-quarter hardwood is a nominal thickness category, not a guarantee of one-inch finished stock. Ask for the dimensions that will arrive and the minimum dimensions after machining.

Allow for the actual machining process

Account for flattening, jointing, planing, saw kerf and trimming checked ends. Wide or warped boards may lose more thickness during flattening. A finish-thickness promise should come from the supplier's process and the condition of the stock.

Specify minimum usable widths and lengths rather than simply asking for 'wide boards.' If you need ten uninterrupted 60-inch rails, ten shorter clear pieces do not meet the requirement. State whether finger joints, glue-ups or color variation are acceptable.

Use the board-foot calculator for volume and the cut-list optimizer for planning. Neither replaces supplier confirmation of available stock.

Grades, treatment and sourcing evidence

Keep appearance and structural grades separate

NHLA hardwood appearance grades describe qualifying clear cuttings under detailed rules. Structural lumber grades connect to published design properties for specified species groups and conditions. An attractive furniture board is not automatically a graded structural member.

Treatment needs a label, not a color assumption

For AWPA-standardized treated wood, request the use category, preservative abbreviation, retention with units and applicable quality marks. UC3B covers exterior above-ground conditions with uncoated wood or poor runoff; UC4A covers general ground contact. Specific assemblies and exposure can require a different category. Retention values cannot be compared without knowing the preservative and species.

Certification is product-specific

For an FSC claim, confirm the supplier's current certificate status and scope and the claim on the sales documents. A certified company's unrelated stock is not necessarily FSC-certified. Reclaimed material also needs provenance and condition checks; an environmental claim does not establish that it is safe to machine or structurally adequate.

Make supplier prices comparable

Ask every supplier to separate material, milling, packaging, freight, unloading or liftgate charges, taxes and minimum-order effects. Confirm the price unit: per board foot, linear foot, piece or sheet. Compare the same grade, dimensions, processing and delivery scope.

Compare totals, not headline rates

For an illustrative 100-board-foot order, $6 per board foot plus $150 milling and $120 freight totals $870 before tax. An $8 per board foot surfaced offer with $70 freight also totals $870. They are only equivalent if the billing basis, usable dimensions and recovered parts are comparable.

Record quote dates, expiration, payment terms, lead times, shortage policies, substitutions and returns. A planning estimate is not confirmed availability or an offer to sell.

Continue with cost per usable board foot and the price methodology.

Specification mistakes to avoid

• Ordering only a species name without a grade, grading system or application.
• Confusing nominal thickness, rough thickness and finished thickness.
• Treating kiln drying as a guarantee of present moisture content.
• Accepting a substitution without checking the design or finish requirements.
• Assuming all pressure-treated lumber is suitable for ground contact or marine exposure.
• Treating a supplier's certification as a certification of every item it sells.
• Comparing a freight-inclusive offer with a material-only rate.
• Ordering a fixed waste allowance without considering part dimensions and grade.

Order checklist and primary sources

Before requesting quotes

• Define the finished application and service conditions.
• Attach quantities, dimensions and the cut list or approved structural schedule.
• Name the grading system and required grade.
• Confirm rough/surfaced measurements and the billing convention.
• Set appropriate moisture, treatment and sourcing-document requirements.
• State substitution rules and delivery access or unloading needs.
• Ask for itemized costs and written terms.

Next steps

Request a quote, then use the delivery inspection checklist to check the order before processing it.

Primary sources and limitations

• USDA Forest Products Laboratory: Wood Handbook explains wood properties and their limitations.
• USDA Chapter 13: Drying and moisture control supports service-environment moisture guidance.
• AWC span-table tutorial explains the variables needed for structural selection.
• AWPA homeowner guidance explains treatment tags and use categories.
• FSC chain of custody explains product-claim traceability.

Reference links checked during preparation on October 1, 2026. Use current applicable rules and manufacturer documents when specifying a real order. These sample requests are educational, not independently reviewed project specifications.