A 4x4x12 pressure treated post typically costs $18-$40, with an average price near $28 per piece at U.S. lumber retailers. Ground-contact treatment, wood species, grade, local availability, delivery, and whether installation is included can move the final quote.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| 4x4x12 treated lumber | $18 | $28 | $40 | Per piece, before tax |
| Ground-contact post | $22 | $32 | $45 | Per piece; treatment and species affect price |
| Installed post | $80 | $150 | $275 | Per post; basic setting, excluding major concrete or access work |
What a 12-foot treated 4×4 usually costs
Retail pricing for a standard 4x4x12 pressure treated board is commonly $18-$40 each. A typical purchase is about $28 per piece, or roughly $1.50-$3.35 per linear foot. The “4×4” is nominal sizing; the finished board is usually about 3.5 by 3.5 inches.
For budgeting, use $28 per board before sales tax and delivery. That estimate assumes common treated lumber, a straight board, and ordinary retail availability. Select structural grades, ground-contact ratings, and premium species can cost more; prices also vary by store and region.
Assumptions: U.S. retail purchase, one standard 12-foot board, no cutting or installation.
How lumber, labor, and delivery shape the quote
A board-only purchase is different from a post installed in a fence, deck, or other structure. Installation charges depend on the task: setting a post in an existing hole is less involved than digging, removing an old post, and placing concrete. The following ranges are typical planning figures, not fixed rates.
| Quote component | Typical range | What changes the charge |
|---|---|---|
| Treated 4x4x12 lumber | $18-$40 per board | Treatment category, grade, species |
| Labor | $50-$125 per hour | Local wage, crew size, job access |
| Post setting materials | $8-$25 per post | Concrete, gravel, fasteners, brackets |
| Delivery | $50-$150 per order | Distance, order size, retailer minimum |
| Removal and disposal | $15-$50 per old post | Concrete footing, breakage, disposal rules |
Labor and delivery can exceed the lumber price on a one-post job. For a labor estimate, contractors may use ; a 1.5-hour task at $75 per hour adds about $113 before materials or any minimum service fee.
Ground-contact rating and grade can change the price
Pressure treatment is not a single specification. Above-ground lumber is generally intended for locations where it is not consistently exposed to soil or standing water, while ground-contact products are treated for more demanding exposure. Check the end tag for the intended use rather than relying on color alone.
For a 12-foot board, a common treated option may fall around $18-$32, while ground-contact or higher-grade stock may run $22-$45. Select structural pieces can exceed these ranges where strength, appearance, or local supply requirements are stricter. Match the treatment label and grade to the actual use before comparing prices.
Length, cuts, and waste matter on a 12-foot board
A 12-foot 4×4 is useful when a project needs long posts or several shorter pieces, but cutting creates offcuts that may not be reusable. If a project needs a finished post longer than 12 feet, a splice is not automatically an acceptable substitute; structural design and local requirements matter.
Allow for the buried portion, finished height, and any cut loss before ordering. For example, a post set 2 feet into the ground leaves about 10 feet above grade before accounting for cuts or adjustments. Buying a longer piece may be necessary for a taller fence, but a longer or specialty size can raise the material cost. Measure the required exposed height and embedment separately.
What do installed-post examples look like?
Three common scenarios illustrate why installed prices differ. These examples assume ordinary access and local labor rates; rocky ground, steep slopes, utility conflicts, or concrete removal can raise the quote.
- Board purchase only: One standard treated 4x4x12 at $18-$40, plus roughly $2-$5 in sales tax depending on location. Total: about $20-$45, excluding delivery.
- Replace one fence post: One ground-contact board at $22-$45, 1-2 labor hours at $50-$125 per hour, and $8-$25 in setting materials. Typical total: about $80-$320, with disposal or a contractor minimum potentially adding cost.
- Install six posts: Six boards at $22-$45 each, setting materials at $8-$25 per post, and roughly 6-12 labor hours. A practical total is about $600-$2,100 before unusual excavation or delivery charges.
Delivery and removal fees to check before ordering
A single 12-foot board may be difficult to transport in a passenger vehicle, so delivery can be a meaningful part of a small order. Retail delivery commonly starts around $50-$150, but a minimum charge, distance surcharge, or special handling fee may apply. Compare the delivered total rather than the shelf price.
Replacement work can also include extracting a post and its concrete footing. Removal and disposal may add $15-$50 per post for straightforward work, while large footings or difficult access can cost more. Ask whether the quote includes hauling, disposal, and any minimum labor charge.
Regional lumber prices and contractor rates differ
Material prices can vary roughly 5%-20% between markets because of distribution distance, local inventory, and demand. Contractor labor may differ more: dense urban markets can run about 10%-30% above smaller towns, while remote locations may add travel or delivery charges. These are broad comparisons, not guaranteed regional price adjustments.
Quotes are most useful when they identify the treatment rating, grade, board count, delivery, labor hours, and removal. A low material price may not be a low project price if the seller charges separately for delivery or the installer bills a minimum. Compare line items using the same lumber specification and project scope.
How to lower the cost without buying the wrong post
Price several local yards and home centers using the same 4x4x12 length, grade, and treatment label. Ask about volume pricing if buying multiple boards, and check whether a pickup order avoids delivery fees. Inspect boards for excessive bowing or damage, since a discounted piece that cannot be used may create waste.
Limit cuts and order only the quantity supported by measured dimensions. If replacing a post, confirm whether the existing footing can remain before paying for full removal. Avoid downgrading from ground-contact treatment where the post will be buried. The safest savings usually come from reducing delivery, waste, and unnecessary labor rather than choosing an unsuitable treatment.