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Firepit seating has one requirement most benches fail: you sit in it for hours, so the back has to recline. This design leans everything back 10° — and cleverly, that's the ONLY angle in the build. Legs, back supports, seat supports: one saw setting, several cuts, and the geometry assembles itself.
The cut list deserves your full attention before the saw comes out, because the 10° cuts come in three flavors: parallel ends measured long-point-to-short-point, non-parallel ends measured long-point-to-long-point, and one part with a single angled end. Mark each piece's job on it in pencil as it comes off the saw — four of these parts differ by fractions of an inch, and a swapped pair builds a bench with a twist.
The source builders note the bench is sturdy as drawn, but offer a cheap upgrade: lengthen the back support boards to about 32" so they tie into the lower arm rail. If the bench will live where teenagers flop into it, take the upgrade — it costs nothing but two longer cuts.
| Item | Qty |
|---|---|
| 2x4, 8 ftFrame, legs, and back. Make the longest cuts first so everything fits. | 4 each |
| 2x6, 8 ftSeat and back slats — each cuts in half to 48". | 3 each |
| Exterior screws, #9 x 2-3/4", self-tapping, star drive | 75 each |
| Exterior wood finishDeck/fence-rated. Firepit benches live uncovered. | 1 quart |
Overall cost: $$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Armrests | 2 | 1 1/2" × 3 1/2" × 21 3/4" |
| LegsBoth ends 10° off square, parallel, long point to short point. | 4 | 1 1/2" × 3 1/2" × 24 3/8" |
| Arm supportsBoth ends 10° off square, NOT parallel, long point to long point. | 2 | 1 1/2" × 3 1/2" × 24 5/8" |
| Seat supportsBoth ends 10° off square, NOT parallel, long point to long point. | 2 | 1 1/2" × 3 1/2" × 27 3/4" |
| Back supportsOne end 10° off square, long point measurement. Cut ~32" instead to tie into the arm rail for extra back strength. | 2 | 1 1/2" × 3 1/2" × 25" |
| Bottom stretcher | 1 | 1 1/2" × 3 1/2" × 45" |
| Seat and back slats2x647-7/8" is fine if your 8-footers are exactly 96" — just halve them. | 6 | 1 1/2" × 5 1/2" × 48" |
Buy 11 boards at 8 ft.
6 boards
5 boards
Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →
On a flat surface, screw each pair of legs to an armrest from the top, two screws per joint. The legs' parallel 10° ends give the assembly its lean — the armrest stays level while the legs rake back.
Measure and mark the support placements per the diagram, then attach the arm support and seat support with two screws per joint. Build the second leg set IDENTICAL to the first — check them against each other before the next step, because a mismatch here is a wobble forever.
Attach a back support to each leg set, screwed to JUST the top seat support for now — full attachment comes later, and you want adjustment room.
The two leg sets get this in MIRROR — one left, one right. This is the classic mistake in this build; dry-place both before driving screws.
If you're taking the strength upgrade, these are the boards you cut at ~32" so they reach the lower arm rail.
Screw the 45" bottom stretcher between the two leg sets. Wrestling two leaning assemblies and a stretcher alone is the hardest 90 seconds of the build — get a second pair of hands, or tack one seat slat across the top first to hold spacing while you fasten.
Lay the bench on its back and attach the back slats, starting at the top and working down.
Then the step the plan bolds for a reason: drive screws through the back legs into the back slats as well. The back-rest takes lean-back loads at a lever angle, and those extra screws are what carry it.
Stand the bench up, lay out the seat slats with even gaps, and screw them to the seat supports.
Sand everything — especially the front seat edge, the back of bare knees finds it every time — and put a real exterior finish on. A firepit bench lives its whole life uncovered in the weather.
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