The price of treated lumber typically runs $5-$25 per board for common residential sizes, while a deck or fence can cost much more once labor and hardware are included. Board dimensions, treatment rating, local supply, and installation scope drive the final estimate.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 2x4x8-ft board | $5 | $8 | $12 | Pressure-treated pine, lumber only |
| 2x6x8-ft board | $8 | $12 | $18 | Common framing or deck use |
| 4x4x8-ft post | $12 | $18 | $28 | Price varies by treatment and grade |
| Installed deck boards | $15 | $25 | $40 | Per sq ft; boards and installation, not full deck structure |
Typical treated lumber prices by board size
For standard ground-contact or above-ground pressure-treated pine, buyers commonly pay $0.60-$1.50 per linear foot for 2x4s, $1-$2.25 for 2x6s, and $1.50-$3.50 for 4×4 posts. Longer lengths and premium grades usually cost more per board. Prices below assume retail purchases of standard stock, not bulk contractor orders.
Budget about $8-$18 for a typical 2x6x8-ft board and $12-$28 for an 8-ft 4×4 post. The treatment label matters: ground-contact lumber is generally priced above lumber intended for above-ground use. Assumptions: standard treated pine, retail pricing, ordinary availability; regional prices vary.
What lumber, labor, and delivery add to a quote
A quote for a project may include more than the boards. Fasteners must be compatible with treated wood, and delivery or cutting can add charges. For installation, labor depends on layout, access, removal, and the number of cuts or connections.
| Cost component | Typical price | What changes it |
|---|---|---|
| Treated pine boards | $0.60-$3.50 per linear ft | Board size, length, grade, treatment |
| Coated or stainless fasteners | $15-$60 per box | Corrosion rating and quantity |
| Carpenter labor | $50-$100 per hour | Local rates and project complexity |
| Delivery | $50-$150 per order | Distance, load size, and minimum fee |
| Removal and disposal | $2-$6 per sq ft | Existing structure and disposal rules |
Labor can rival the material bill on small jobs, so estimates should separate boards, hardware, delivery, and installation.
How board thickness and treatment rating change the price
Dimensions create the clearest price difference: a 2×6 typically costs more than a 2×4 of the same length because it contains more wood. A 12-ft board may cost more overall than an 8-ft board, though buying longer stock can reduce seams in some layouts. Select grade and appearance may also carry a premium over common construction grade.
Treatment category is another key variable. Above-ground lumber is suitable only where the board is not exposed to soil or persistent moisture; ground-contact-rated boards are needed for posts and other eligible applications close to soil. A 4×4 post rated for ground contact may cost $3-$8 more than a comparable above-ground post. Match the treatment label to the intended exposure instead of choosing solely by price.
Project scale changes unit costs too. A job using fewer than 20 boards may face a delivery minimum, while a bulk order of 100 or more boards may qualify for a contractor or volume discount. Check actual dimensions and treatment markings on the quote, not just the nominal size.
Regional lumber prices from rural yards to city stores
Retail treated-pine prices can run roughly 10%-20% below the national middle in areas near mills or with several competing suppliers. Remote locations may land 10%-25% above typical pricing because of freight and fewer retailers. Large metro areas can also price 5%-15% higher than nearby rural markets, particularly during busy building seasons.
These are planning differences, not guaranteed regional rates. Compare the same length, grade, and treatment category across suppliers. A lower board price may not save money if delivery is expensive or the lumber has more defects that create waste. Use a local quote for the same specifications before setting a project budget.
Installed deck boards and fence posts need different budgets
Decking installation is commonly priced around $15-$40 per sq ft for boards and labor when the supporting frame is already sound. Replacing only deck boards on a 200-sq-ft surface might total $3,000-$8,000, with the high end reflecting labor, difficult access, premium boards, or removal of old material. This does not include major framing repairs.
For a simple 6-ft privacy fence, treated posts and basic rails may cost about $8-$18 per linear ft in materials, before pickets, gates, and labor. Installed fence pricing can rise to $25-$55 per linear ft depending on terrain, post spacing, height, and removal. Deck-board replacement and a new fence are not comparable lumber-only estimates.
Three treated lumber project quotes with realistic scope
A small raised garden bed using eight 2x6x8-ft boards may cost $80-$150 for lumber, screws, and minor cutting, excluding labor. A 100-sq-ft deck-board replacement may run about $1,500-$4,000, assuming ordinary access and no structural repairs. A 100-linear-ft fence section with treated posts and rails may cost $800-$1,800 in those materials alone; pickets and installation are additional.
For hired work, a two-person crew may spend 8-16 hours on a straightforward small deck-board replacement. At combined labor billing of about $100-$180 per crew hour, labor could add $800-$2,880. Written estimates should state square footage or linear footage, board dimensions, removal, hardware, and labor hours.
Pressure-treated pine versus cedar or composite boards
Pressure-treated pine usually has the lowest upfront board price. Cedar decking boards often cost about $3-$7 per linear ft, while composite deck boards commonly run $4-$12 per linear ft before installation. These alternatives may change appearance, upkeep, and service life, so compare installed prices and maintenance needs rather than material prices alone.
Treated lumber can require periodic cleaning and, when appropriate for its condition and product instructions, sealing or staining. That upkeep adds expense, but replacing sound boards just to avoid maintenance may cost more. Repair individual damaged boards when the frame is sound; replace the structure when widespread rot or movement makes repairs unreliable.
How to trim a treated lumber order without wasting boards
Measure the project before ordering and include a modest allowance for cuts, typically about 5%-10% for a simple layout. For angled designs or many short pieces, waste may be higher. Confirm whether the supplier charges for delivery, returns, cut-to-length service, or restocking before placing the order.
Compare at least two quotes using identical treatment ratings, dimensions, and quantities. Avoid paying for ground-contact lumber where above-ground-rated material meets the application, but do not downgrade where soil exposure requires a higher rating. Buying standard lengths and limiting special cuts can also help control the bill. The most reliable savings come from matching the grade and treatment to the job and avoiding excess material.