Treated vs. untreated wood cost depends on lumber dimensions, treatment type, grade, and whether the project is exposed to moisture or soil. For common 2-by-4-by-8-foot boards, treated lumber typically costs $6-$10, compared with $4-$7 for untreated lumber; project labor, delivery, and finishing can widen the difference.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 2-by-4-by-8-foot lumber | $4 untreated | $6 treated | $10 treated | Grade and local supply affect price |
| 5/4-by-6 deck board | $1.25 per linear ft | $2 per linear ft | $3 per linear ft | Pressure-treated, standard grade |
| Small 100-sq-ft deck materials | $700 | $1,100 | $1,700 | Framing and boards, before labor |
| Installed 100-sq-ft deck | $2,500 | $4,000 | $6,500 | Basic access and ground-level scope |
What pressure-treated lumber costs by board and project
Pressure-treated pine is commonly priced at $6-$10 for a 2-by-4-by-8-foot board, while an untreated equivalent often runs $4-$7. A 4-by-4-by-8-foot treated post generally costs $12-$22, compared with about $9-$17 untreated. These are retail ranges for standard grades; longer lengths, better appearance grades, and local inventory can change the ticket.
For a 100-square-foot ground-level deck, treated framing and decking materials may total $700-$1,700. Hiring a contractor can bring the installed price to roughly $2,500-$6,500, depending on stairs, railing, demolition, and site access. Untreated lumber can lower the initial material bill, but it is not a like-for-like substitute where wood contacts soil or stays damp.
Assumptions: standard pine, ordinary access, common residential sizes, and no major demolition or structural redesign.
How treatment, grade, and labor shape the lumber invoice
The wood itself is only part of a project quote. Treatment level, board grade, fastening hardware, delivery, and installation can each affect the total. A contractor may also charge a minimum labor fee for a small repair, even when the lumber quantity is low.
| Quote component | Typical range | Pricing basis | What changes it |
|---|---|---|---|
| Untreated pine boards | $4-$7 | 2-by-4-by-8-foot board | Grade and market |
| Pressure-treated pine | $6-$10 | 2-by-4-by-8-foot board | Treatment and drying |
| Labor | $50-$100 | Per hour, per worker | Cutting, fastening, access |
| Fasteners and connectors | $40-$180 | Small project allowance | Corrosion-resistant hardware |
| Delivery or disposal | $50-$250 | Per trip or load | Distance and old material |
Installation labor for straightforward framing often takes 4-12 hours on a small project, while deck work can require a crew for several days. captures the basic labor estimate, but mobilization, cleanup, and job minimums may be added separately. Ask whether the quote includes hardware, delivery, waste, and any required finish.
When do board size and moisture exposure change the price?
Thickness and span matter: a 2-by-6 board costs more than a 2-by-4, and long spans may call for larger dimensions or engineered members. A 12-foot treated 2-by-6 commonly costs about $15-$28, while an untreated one may be $10-$20. Structural loads and local code requirements—not price alone—determine the appropriate size.
Exposure also changes the specification. Lumber rated for above-ground use is not automatically suitable for ground contact; ground-contact treatment may add roughly 10%-25% over comparable standard treated stock. Posts buried in soil, boards near standing water, and framing within about 6 inches of soil deserve particular attention to label and code requirements. Choose treatment for the actual exposure rather than paying for a stronger rating everywhere.
What does untreated lumber save, and where can it fail?
Untreated boards may save roughly 15%-35% on comparable pine lumber, making them useful indoors in dry, protected locations. They are also common for furniture and interior trim where moisture and insect exposure are limited. Savings can disappear if untreated wood is used outdoors without suitable protection and needs earlier repair or replacement.
Pressure-treated lumber resists decay and insects, but it can be wetter and heavier when purchased, and it may shrink or warp as it dries. Some projects require compatible galvanized or stainless-steel fasteners. For visible outdoor surfaces, compare treated pine with naturally durable options such as cedar; cedar can cost substantially more upfront, often $3-$7 per linear foot for a deck board. Compare service conditions and upkeep, not just the shelf price.
How much do cutting, delivery, and sealing add?
Delivery often adds $50-$150 for a nearby order, with longer distances, small-load fees, or difficult access pushing charges toward $250 or more. Cutting services may be free for a few cuts or cost $1-$5 per cut. Disposal of old framing can add $100-$400, depending on volume and local hauling fees.
Allow about $30-$80 for a small-project wood preservative or end-cut treatment product; labor for applying finishes is additional. Sealers and stains are generally applied after the wood has dried sufficiently, so the schedule can involve a return visit. Get written pricing for delivery, cutting, disposal, and finishing before comparing material-only quotes.
Why do treated wood prices vary by U.S. region?
Retail lumber and installed prices can run about 10%-20% above national norms in high-cost coastal metros, while some rural markets are 5%-15% lower when supply is nearby. Remote locations may reverse that advantage because freight charges and limited contractor availability raise the delivered price. Seasonal construction demand can also tighten stock and labor availability.
Regional differences are not consistent across every board size or treatment type. Compare quotes using the same dimensions, grade, treatment rating, quantity, delivery terms, and labor scope. A quote that appears cheaper may exclude connectors or use a lower treatment rating. Local comparisons are most useful when each estimate specifies the same lumber and project scope.
Can maintenance costs change the treated-versus-untreated gap?
Both types can benefit from keeping water away, sealing exposed end grain, and replacing damaged boards promptly. Exterior untreated pine may need paint or stain soon after installation and periodic renewal, with materials commonly costing $25-$60 per gallon. Treated lumber also needs time to dry before many coatings adhere reliably; follow product instructions and local recommendations.
There is no universal replacement interval: drainage, sun, climate, and construction quality matter. In a dry, enclosed location, untreated lumber may last well; in persistent dampness or soil contact, using the correct treated rating can avoid costly repairs. Budget for the exposure and maintenance schedule over the project’s life, not only the first purchase.
Where can a project trim treated lumber costs?
Keep the design within standard board lengths and sizes to reduce offcuts, and order a measured quantity with a reasonable waste allowance rather than buying excessive extra stock. Compare at least three itemized quotes, checking treatment rating, grade, fasteners, delivery, and labor. Buying materials and hiring installation separately can save money in some markets, but it shifts measurement and shortage risk to the owner.
Use treated lumber where exposure requires it and consider untreated stock only in appropriate dry, protected areas. Avoid unnecessary premium grades for hidden framing, but do not reduce structural dimensions or treatment specifications without confirming code and design requirements. The safest savings come from controlling waste and scope, not substituting unsuitable lumber.