How to Build an Adirondack Chair — Classic Design, $35 Per Chair

The Adirondack chair has been around since 1903 and the design hasn't been improved on. Sloped seat, wide arms, fan back, low center of gravity — it's engineered to be comfortable for long sits without cushions, which is exactly what you want on a patio or lakeside.

A single Adirondack chair from a patio store runs $160–$400. Building one yourself from a single 12-foot 2×6 and a couple of 1×4s costs about $35 and takes an afternoon. The one catch is that the chair uses curved cuts — you'll need a jigsaw or bandsaw, and a paper template saves hours.

Why You Need a Template

The seat slats and back slats on an Adirondack chair are straight pieces, but the side supports, the back support curves, and the arm rests all involve curved or angled cuts that are extremely hard to replicate by eye.

Print a full-size PDF template (most good plans include one), glue it to hardboard with a spray adhesive, cut the template out with a jigsaw, and use it to trace every curved part onto your lumber. The template can be reused dozens of times — most people who build one chair end up building four.

Materials & Cost

Use cedar if you can afford it — the chair will last 15+ years untreated. Standard pine works if you stain annually but will need replacement in 5–7 years. Avoid pressure-treated for furniture you sit on.

Tools

• Jigsaw (for the curves)
• Circular saw or miter saw (for straight cuts)
• Drill/driver with countersink bit
• Random orbit sander
• Clamps
• Paper or hardboard template (from a plan)

Cut List

• 2 side supports / stringers (from 2×6): 36" long, shaped per template
• 1 front apron: 2×4 @ 22"
• 1 rear seat support: 2×4 @ 22"
• 5 seat slats: 1×4 @ 22"
• 7 back slats: 1×4 @ 34" (trim the center five progressively taller for the fan shape)
• 1 back top curve: 1×6 @ 22" (cut arc per template)
• 1 lower back support: 1×4 @ 22"
• 2 arm rests: 1×6 @ 28", shaped per template
• 2 arm braces: 1×4 @ 7" (triangular, from template)
• 2 rear legs: 2×4 @ 22"

Assembly

1. Shape the stringers

The stringers are the sloped pieces that form both the front legs and the seat base. Trace the template onto each 2×6, cut the shape with a jigsaw, sand smooth. These are the most important pieces in the whole chair — if they're symmetric to each other, the chair will sit flat; if they aren't, it'll wobble.

Stack the two cut stringers together and clamp. Sand the edges simultaneously so any asymmetry gets averaged out.

2. Build the seat base

Stand the two stringers parallel, 22" apart (outside to outside). Connect them at the front with the front apron (flush to the front edge) and near the rear with the rear seat support.

Attach each joint with three 2" exterior screws, countersunk. Check for square after the first joint — once both apron and rear support are in, the base should be rigid and flat.

3. Attach the seat slats

Lay the five 22" seat slats across the stringers. Leave a 1/4" gap between each slat — a 1/4" washer or a piece of scrap works as a spacer.

Drive two screws per slat per side (so four screws per slat). The front slat should overhang the front apron by 1" for comfort. Round over the front slat's leading edge with a sander — this is where your thighs hit.

4. Build the back

Lay the seven back slats flat on the ground, tallest in the middle. Connect them with the lower back support running horizontally across the bottom (screwed to the back of the slats), and the curved back top running across the top.

The "fan" shape of the back comes from trimming the slat lengths: center slat is full 34", the two flanking it are ~32", the next two are ~30", and the outermost two are ~28". Exact numbers come from your plan's template — it'll have the trim line marked.

5. Attach the back to the seat base

Stand the back assembly between the rear ends of the stringers, angled backward about 15° from vertical. Screw through each stringer into the lower back support.

Also install the rear legs at this stage — they're the short 2×4 pieces that support the rear of the stringers and prevent the chair from tipping back when you sit down hard.

6. Install the arms

The arms are the signature feature of an Adirondack chair — wide, flat, the perfect place to set a drink. Shape both arms from the template, attach the triangular arm braces under each (for structural support), and screw the arms to the top of the stringers and to the back slats.

Arm height should be 26" from the ground at the front of the chair — comfortable elbow rest position for most adults.

The Leg Brace Detail People Skip

Underneath the seat, behind the front apron, most plans show a diagonal brace running from the front apron down to the stringer. It's a small, hidden piece — and most first-time builders skip it to save time.

Don't. Without that brace, the front apron takes all the weight of a person leaning back, and within a year the screws will pull out of the end grain, the apron will crack along its length, and the front of the chair will sag. The brace takes the load off the apron and transfers it to the stringers.

One 2×4 cut at 45° on each end, glued and screwed in place. Five minutes of work, doubles the lifespan.

Finishing

For cedar: a single coat of penetrating exterior oil (boiled linseed, teak oil, or a pre-mixed Cabot's exterior oil). Reapply every 1–2 years. Cedar will silver beautifully if left completely untreated.

For pine: one coat of exterior wood conditioner, two coats of solid exterior stain or exterior paint. Pine without a pigmented finish will grey unevenly and crack within a few seasons.

Common Mistakes

Using 1×2 or 1×3 back slats instead of 1×4. Narrower slats look more modern but the gaps between them pinch skin on bare arms and hurt lean-back comfort. Stick with 1×4.

Mounting the back at 90° (straight up). An Adirondack is supposed to lean back about 15°. Straight-backed defeats the whole point of the design.

Screwing through the face instead of the back of the slats. Exposed screw heads on the seat slats look okay; exposed screws on the back slats look terrible. Drive back-slat screws from behind, through the back support, into the slat.

Final Thoughts

The Adirondack is the chair most DIYers are most proud of. It takes a jigsaw, a template, and about four hours — and when you're done, you've made something that looks handmade in the best way, costs less than a tenth of the store version, and will still be in your yard in a decade.

Build two. Nobody wants to sit by themselves.

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