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This is two simple 2x8 boxes stacked on each other, sized so the top step sits back far enough from the bottom step's edge to actually be walkable — or, since both boxes are just as happy holding soil as bearing weight, the same structure doubles as a two-tier garden bed or a stacked bench depending on where it lands in the yard.
The two steps use slightly different lumber on purpose: the bottom step is built from 2x8s while the top step also uses 2x8s, which makes the bottom step 1-1/2" taller than the top — a detail the source is upfront about accepting if the base will be surrounded by grass anyway. If matched step heights matter for your use, swap 2x6s into the bottom step instead, since a plain height mismatch stops being invisible once there's no grass to hide the difference.
Build both boxes with self-tapping deck screws, then set the top step on the bottom and adjust for square before adding the treads and trim. The 45°-mitered 2x4 top trim is the one part that needs real corner-cutting care — everything else is straightforward butt joints in construction lumber. Use materials genuinely rated for outdoor and ground-contact exposure — anything less breaks down fast sitting directly on soil or grass.
| Item | Qty |
|---|---|
| 2x8, 8 ft, ground-contact rated | 6 each |
| 2x4, 8 ft, ground-contact rated | 4 each |
| 2x6, 10 ft, ground-contact rated | 2 each |
| Exterior deck screws, 2-3/4" | 80 each |
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 |
|---|---|---|
| Bottom step, long sides2x8, 8 ft, ground-contact rated | 2 | 1 1/2" × 7 1/4" × 96" |
| Bottom step, ends2x8, 8 ft, ground-contact ratedSwap for 2x6 stock if you want the bottom step to match the top step's height. | 5 | 1 1/2" × 7 1/4" × 18" |
| Top step, long side2x8, 8 ft, ground-contact rated | 1 | 1 1/2" × 7 1/4" × 96" |
| Top step, ends2x8, 8 ft, ground-contact rated | 4 | 1 1/2" × 7 1/4" × 18" |
| Top step, sides2x8, 8 ft, ground-contact rated | 2 | 1 1/2" × 7 1/4" × 21" |
| Top step, back2x8, 8 ft, ground-contact rated | 1 | 1 1/2" × 7 1/4" × 54" |
| Top step, internal supports2x4, 8 ft, ground-contact rated | 3 | 1 1/2" × 3 1/2" × 7 1/2" |
| Tie-in trim2x4, 8 ft, ground-contact ratedCut to fit. | 8 | 1 1/2" × 3 1/2" × 14 1/2" |
| Top trim2x4, 8 ft, ground-contact ratedBoth ends cut at 45°, long point to long point measurement. | 8 | 1 1/2" × 3 1/2" × 22 1/2" |
| Treads2x6, 10 ft, ground-contact rated | 4 | 1 1/2" × 5 1/2" × 54" |
Some parts are longer than a 8 ft board, so there is no honest board count to show here. Open the board plan to pick a longer stock length — it names every part that does not fit.
3 boards
Build the bottom step box from the 2x8 long sides and ends, screwing together with self-tapping deck screws. If you need the top and bottom step heights to match exactly, substitute 2x6 stock for the bottom step instead of 2x8.
Begin the top step construction with the long side, ends, and internal supports as shown, then attach the remaining boards to complete the top step box.
Place the top step on the bottom step and adjust for square.
Attach the tie-in trim and mitered top trim to the steps framing, then attach the treads on top. Finish with materials rated for outdoor and ground-contact use.
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4 boards
4 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 →