Where to Buy 20 Ft Deck Boards: Retailers, Availability & Special-Order Tips (2026)

Most home centers stock deck boards up to 12 or 16 feet on the shelf. A true 20 ft board is a different animal: it’s usually a special-order item, not something you’ll find stacked and ready for curbside pickup. You can still get 20 ft deck boards from Home Depot, Lowe’s, and regional lumberyards, plus online from AdvantageLumber.com and Vintage Woodworks — but knowing which of those actually stock the length versus which just order it in for you will save you a wasted trip.

Quick Answer: Where to Buy 20 Ft Deck Boards

Home Depot and Lowe’s both carry select composite lines (Trex, TimberTech, Fiberon) in 20 ft lengths, though availability varies by store and usually runs through the Pro Desk rather than the regular decking aisle. For pressure-treated wood, a local lumberyard is a more reliable bet than a big-box store. AdvantageLumber.com and Vintage Woodworks sell 20 ft hardwood and composite boards online with shipping to your address.

Why 20 Ft Is a Special-Order Length, Not a Shelf Size

Generic decking guides tend to list a handful of retailers and stop there, without explaining why 20 ft boards are harder to find than 12 or 16 ft ones. The reason comes down to shelf logistics. Home centers stock lengths that fit standard racking and move fast — 8, 10, 12, and 16 ft cover the overwhelming majority of residential deck framing, so those are what sit in the aisle. A 20 ft board is longer than most delivery trucks can rack efficiently alongside shorter stock, and it only fits a narrower slice of projects (a deck run long enough to actually use the full length without heavy waste). That makes it a special-order item at most stores rather than something kept on hand.

In practice, this means a call to the Pro Desk (Home Depot) or the building materials desk (Lowe’s) before you drive over is worth it. Staff can check whether a store’s distribution center carries 20 ft in the brand and material you want, and give you a realistic lead time — it’s rarely same-day for this length, even when the store’s own website shows the length as an option online.

Wood vs. Composite vs. PVC: Which 20 Ft Board Fits Your Project

Material affects both price and how easy a 20 ft length is to actually track down.

Pressure-Treated Wood

Pressure-treated Southern yellow pine is the cheapest 20 ft option and the easiest to special-order through a local lumberyard, since yards routinely cut and stock dimensional lumber to order. The tradeoff is movement: a 20 ft treated board is more likely to bow, twist, or check as it dries than a 12 ft one, simply because there’s more length for wood to move along. Buy it as close to installation day as possible rather than letting it sit.

Composite

Trex, TimberTech, and Fiberon all manufacture 20 ft boards in select product lines, but not every color or profile is made in that length — some top-tier collections cap out at 16 ft. Composite in 20 ft is heavier and pricier per board than wood, but it won’t cup or splinter the way a long wood board can, which matters more the longer the board gets.

PVC

Cellular PVC decking (AZEK and similar) is available in 20 ft runs from specialty dealers and is the most dimensionally stable of the three over that length — it expands and contracts with temperature but doesn’t warp from moisture the way wood does. It’s also the most expensive per linear foot, so it tends to make sense on visible, high-traffic decks rather than budget builds. If composite is your direction specifically, our 20 ft composite deck boards guide breaks down which brands actually make a true 20 ft length and how to keep a long composite run from sagging between joists.

Retailer-by-Retailer Buying Guide

Home Depot

Home Depot’s own site lists 20 ft options in several composite lines, filterable by length under the decking category. In-store availability is store-specific — some locations keep a small run of 20 ft treated lumber, most don’t. The Pro Desk can place a special order for a length or brand your local store doesn’t shelve.

Lowe’s

Lowe’s carries a similar mix: 20 ft wood decking boards are listed on their site with delivery or in-store pickup depending on stock at your local store. Their building materials desk can also special-order longer lengths that aren’t shown as in-stock nearby.

Menards and Regional Lumberyards

Menards and independent lumberyards are often a better bet than the two big national chains for long treated lumber specifically, since yards cut and rack dimensional stock to order rather than relying on pre-packaged shelf lengths. If you’re near a dedicated lumberyard rather than only a home-improvement store, call ahead — yards frequently have 20 ft in stock precisely because home centers usually don’t.

AdvantageLumber.com and Vintage Woodworks (Online)

Both sell 20 ft boards online with nationwide shipping. AdvantageLumber.com specializes in hardwood decking (ipe, tigerwood) plus PVC, while Vintage Woodworks carries PVC and porch flooring profiles. Online ordering removes the local-stock guesswork, but freight charges on a 20 ft board add up fast — get a shipping quote before comparing their price to a local store’s.

Handling, Transport & Installation: What Changes at 20 Feet

A 20 ft board isn’t just a longer version of a 12 ft one to move around — the extra length changes how it needs to be handled, hauled, and sometimes installed.

Delivery Is Usually the Better Call

Most pickup trucks and even long-bed trailers can’t fully support a 20 ft board without a significant overhang front or back. An unsupported overhang flexes with every bump, and a wood board especially can develop a permanent bow from riding that way for even a short trip. If the retailer offers delivery, it’s worth the fee for this length — their trucks are built to rack and support full-length stock properly. If you do haul it yourself, support the board at multiple points (not just the truck bed and a single strap at the tailgate) and never let more than a couple of feet hang unsupported.

Storage Before Installation

Stack 20 ft boards flat on level stickers (spacer strips) every few feet, not leaned against a wall or propped on two end supports — the same principle as delivery: unsupported length sags and can set a permanent bend, especially in wood or if boards sit in the sun for more than a day or two before install.

When a Butt Joint Beats a Single 20 Ft Run

A true 20 ft board isn’t always the most practical answer, even when you can source one. If your deck run is close to but not exactly 20 ft, or if sourcing the length locally means a multi-week special order, joining two shorter boards at a butt joint over a joist (staggered from adjacent rows so seams don’t line up) is a standard, structurally sound alternative — it’s how many pros handle long runs even when longer stock is available, because it’s easier to source, cheaper, and easier to replace a single damaged board later. Hidden fastener clips (like the pick above) keep that seam from standing out the way a pair of visible screw heads would.

Frequently Asked Questions

Is 20 Ft the Longest Decking Board You Can Buy?

20 ft is the longest length most retailers and manufacturers offer as a standard product, though it’s typically a special-order size rather than something stocked on the shelf. A handful of specialty lumberyards can rip longer custom lengths on request, but 20 ft is the practical ceiling for off-the-shelf composite and wood decking.

How Much Does It Cost to Build a 20×20 Deck?

Materials for a 20×20 wood decking project typically run $10,000 to $15,000, depending on framing, decking material, and railing choices; composite or PVC decking pushes that toward the higher end of the range.

What Lengths Do Wood Deck Boards Come In?

Wood deck boards are most commonly stocked in 8, 10, 12, and 16 ft lengths, with 20 ft available as a special order at most retailers and lumberyards.

What Is the Cheapest Deck Board Option?

Pressure-treated wood is the least expensive decking material. It’s chemically treated to resist rot and insect damage, which keeps the upfront cost well below composite or PVC, though it needs more regular maintenance over time.

Conclusion

20 ft deck boards exist at every major retailer’s catalog level, but treat the length as a special order rather than an in-stock item — call ahead, ask about lead time, and get a delivery quote before assuming you can pick one up today. If a full-length run turns out to be impractical for your timeline or budget, a staggered butt joint with hidden fasteners is a legitimate, commonly used alternative rather than a compromise.