A raised planter with legs comes together in one afternoon: cut boards, screw the frame, add legs, line the box, then fill and plant.
A standing planter is easy on the back, neat on patios, and tidy on small decks. The build below fits a common 2×4/2×6 lumber stack, holds a weekend’s worth of work, and rides on sturdy legs at counter height. You’ll get a clear cut list, a no-guess assembly order, and a soil recipe that drains well. No fancy tools. No fuss.
Raised Garden Box On Legs: Tools And Lumber
This project makes a planter that’s roughly 4 ft long × 2 ft wide × 12 in deep with a working height near 32–34 in. The depth grows leafy greens, herbs, radishes, peppers, and compact tomatoes. If you need more room, scale the length in 12-inch steps. Cedar lasts long and looks great. Untreated pine costs less and works fine with a liner. Modern pressure-treated boards are common for outdoor builds; if you use them for edible crops, read the official guidance linked later in this guide before you choose.
Cut List And Materials
Buy straight boards with tight grain and minimal knots near screw points. The table shows one planter; double the quantities for a matched pair.
| Part | Qty | Dimensions / Notes |
|---|---|---|
| Long Side Rails | 2 | 2×6 @ 48 in (outer length) |
| Short Side Rails | 2 | 2×6 @ 21 in (fits between long rails) |
| Bottom Slats | 6 | 1×4 @ 21 in (gapped for drainage) |
| Ledger Strips | 2 | 2×2 @ 45 in (carry the bottom slats) |
| Legs | 4 | 4×4 @ 32–34 in (pick your working height) |
| Leg Braces | 4 | 2×4 @ 18 in (two sets, one per side) |
| Lower Shelf Slats (optional) | 6 | 1×4 @ 21 in (storage shelf) |
| Fasteners | — | Exterior screws: 2½ in for rails/legs, 1¼ in for slats |
| Liner & Mesh | — | Landscape fabric, weed-free; ¼ in hardware cloth (bottom) |
| Finish (optional) | — | Exterior oil for cedar; paint for pine; skip inside faces |
Basic Tools
- Circular saw or miter saw, plus a sharp pencil and square
- Drill/driver with countersink bit and ⅛ in pilot bit
- Clamps, measuring tape, safety glasses, dust mask, gloves
- Staple gun for fabric and mesh
- Sanding block (120-150 grit) for edges
Plan The Size, Height, And Placement
Pick a spot that gets six to eight hours of sun, with a hose within reach. On decks, keep weight in mind: damp soil is heavy. A 4×2×1 ft box holds about eight cubic feet of mix. Wet mix weighs more than 400 lb once saturated, plus wood weight. Place the planter close to joists or over a beam on older decks. On patios, set it near a drain line or along a wall out of foot traffic.
Height is comfort. Many folks like 32–34 in so the rim sits near the hip. If you garden from a stool, trim the legs to 28–30 in. For wheelchair access, use 27–28 in clearance under the rim and leave one long side open.
Build The Box First
1) Cut And Pre-drill
Cut the long and short rails to length. Mark pilot holes ¾ in from each edge and 1½ in from ends. Pre-drill to avoid splits. Sand ends and edges so the liner won’t tear later.
2) Assemble The Frame
Lay the long rails flat on the work surface. Fit the short rails between them to form a rectangle. Check for square by measuring corner to corner; the numbers should match. Drive 2½ in exterior screws through the long rails into the short rails, two per joint. Recheck square.
3) Add Ledgers For The Bottom
Flip the frame upside down. Fasten the 2×2 ledgers along the inside faces of the long rails, flush with the lower edge. Use 1¼ in screws every 8–10 in. These strips carry the slats that hold the soil. Keep them straight so the bottom sits even.
Attach The Legs And Braces
4) Mount The Legs
Stand the 4×4 legs at each corner, tight to the frame. The top of each leg should be flush with the top of the box, not proud. Pre-drill through the long rails into the legs and drive two 2½ in screws per side, staggering the holes. Then add two more through the short rails into each leg. The box should feel rigid once all four are tied in.
5) Add Braces For Side Stiffness
Fasten one 2×4 brace between each pair of legs on the long sides, about 8–10 in above the ground. This locks the legs against racking. Use two 2½ in screws at each end. If you want a storage shelf, later you’ll lay slats across these braces.
6) Fit The Bottom
Set the 1×4 bottom slats across the ledgers with a small gap between each slat. A paint-stir stick makes a handy spacer. Keep the gaps even for drainage and air. Screw each slat to the ledgers with 1¼ in exterior screws. For extra rigidity and rodent control, staple ¼ in hardware cloth under the slats; it acts like a welded net and spreads the load.
Line, Drain, And Finish
7) Add A Breathable Liner
Staple a layer of landscape fabric inside the box, up the sides, and over the rim by ½ in. Cut neat X-shapes where the legs pass through if you lined before leg install. Press the fabric into the corners so soil won’t leak into gaps. This liner keeps fine particles inside while still letting water pass.
8) Create Drainage Paths
Drill four ½ in holes through the fabric and between slats near each corner. Don’t add a plastic sheet; the mix needs to drain. If your patio pools after rain, raise the feet on composite shims so water can pass under the planter.
9) Seal Or Paint (Optional)
Brush a thin exterior oil on cedar. For pine, a water-based paint or stain on outside faces only keeps the box tidy. Leave the inside bare so the mix can breathe. If you used modern treated lumber, keep soil contact off raw cut ends with fabric and avoid food contact with sawdust.
Soil Depth, Fill, And First Watering
Depth drives root health. Most greens and herbs thrive in 8–12 in. Fruiting crops like tomatoes and peppers like 12–18 in. Beds on hard surfaces can grow a lot as long as the mix drains well. For a deep dive on bed depth, spacing, and barriers, see the UMN Extension raised bed gardens page, which lays out why barriers under the box often hurt roots by limiting access to the subsoil.
Right-Size Your Mix
A balanced mix holds moisture but doesn’t stay soggy. You can buy bagged raised-bed soil or blend your own. The recipes below are easy to measure with a bucket.
| Mix | Volume Ratio | Best For |
|---|---|---|
| All-Purpose | 1 compost : 1 peat/coir : 1 perlite | Leafy greens, herbs, annual flowers |
| Veggie-Heavy | 2 compost : 1 peat/coir : 1 perlite | Tomato, pepper, cucumber in warm months |
| Lightweight Patio | 1 compost : 2 peat/coir : 1 perlite | Upper decks where weight matters |
Top off the box, water until you see steady drips from the drains, then add more mix to replace settling. Mix in a slow-release organic fertilizer at label rates. Scratch a small handful into the top layer every 4–6 weeks during peak growth.
Use Of Cedar, Pine, Or Treated Wood
Cedar and redwood resist decay and look clean without paint. Pine costs less and lasts fewer seasons outdoors. Many builders pick modern pressure-treated lumber for legs or frames on outdoor projects since it stands up to weather. If you’re weighing that choice for edible crops, read the EPA overview of wood preservatives and local extension guidance before you buy; older CCA formulas were phased out for most residential uses years ago, and today’s common formulas differ. A fabric liner keeps mix off any raw faces either way.
Step-By-Step Assembly At A Glance
Mark, Cut, And Pre-drill
- Mark all cuts with a square. Label parts as you go.
- Pre-drill near board ends. Countersink the rail screws so heads sit flush.
Build, Square, And Tie Into Legs
- Assemble the box rectangle on a flat surface.
- Measure diagonals and tweak clamps until both match.
- Drive the rail screws, then fasten the legs tight to each corner.
Add Bottom, Braces, And Shelf
- Screw ledgers inside the long rails.
- Lay bottom slats with even gaps and fasten to the ledgers.
- Add side braces and, if you want storage, lay shelf slats across them.
Line, Fill, And Plant
- Staple fabric up the sides with clean folds in corners.
- Fill with your mix, water to settle, then top off.
- Plant starts or seeds, add a label, and soak again.
Sizing Upgrades And Variations
Longer Planter
Extend the long rails to 60 or 72 in. Add a fifth and sixth leg at the midpoints to carry the load on long spans. Increase the number of bottom slats to keep the same gap spacing.
Deeper Box
Swap 2×6 side rails for 2×8 or 2×10. Keep the same ledgers and slats. Watch weight; a 2×10 box holds far more mix. On small decks, build two shallower planters instead of one deep box.
Cold-Season Cover
Add short ¾ in PVC hoops with strap clamps inside the long rails. Clip a clear cover on cool nights in spring and fall. Vent by lifting one edge at midday.
Soil, Water, And Feeding Routine
Watering
Deep, less frequent watering grows stronger roots than daily sips. Push a finger into the mix; if the top inch feels dry, it’s time. Set a cheap timer and a drip line along each row for hands-off mornings.
Feeding
Compost in the mix feeds microbes and keeps texture springy. For heavy feeders like tomatoes, scratch a balanced granular product into the top layer at planting, then side-dress midseason.
Refreshing The Mix
Each season, pull roots, fluff the top 6–8 in with a hand fork, and blend in fresh compost. Every 3–4 years, scoop out half the volume and replace with new mix to bring back bounce and drainage.
Safety, Lifespan, And Care
Fasteners And Corners
Use exterior-rated screws. Check corners each spring and snug any that back out. If a slat bows over time, pop it off and flip it.
Drainage And Rot
Keep the fabric intact and the gaps open. Brush away soil that piles up around the legs. If your patio floods, raise the feet on composite shims or pavers so water can pass under the box.
Gloves And Cuts
Wear gloves during the build and when working soil. Clean any nicks right away. For wound care and vaccine timing, see the CDC’s plain guidance on tetanus management for healthcare providers; it outlines shot intervals and care steps without fluff. You can review it here: CDC tetanus guidance.
Troubleshooting Common Problems
Planter Feels Wobbly
Check that braces meet the legs with tight joints. Add a second set of braces on the short sides if the planter rocks. Make sure the feet sit flat; shim as needed.
Water Puddles In The Mix
Open the gaps between slats, clear the drain holes cut through the fabric, and blend in more perlite. Avoid a plastic liner that traps moisture.
Leaves Look Pale
Feed with a balanced product at label rates and give the bed a deep soak. Sun can be low on a shaded patio; move the planter a few feet toward brighter light.
Cost And Time Planner
Prices vary by region and wood choice. The table below gives a plain estimate for one planter built with cedar or pine. Swap in reclaimed boards to cut costs; just avoid boards with old paint of unknown origin.
| Build Choice | Estimated Cost | Hands-On Time |
|---|---|---|
| Cedar Rails + Cedar Legs | €160–€220 | 4–5 hours |
| Pine Rails + Cedar Legs | €110–€160 | 3–4 hours |
| Pine Rails + Pine Legs | €80–€120 | 3–4 hours |
Quick Reference: Dimensions, Soil, And Spacing
Starter Dimensions
- Planter box inside: ~45 in × 21 in × 11 in deep (after lumber thickness)
- Rim height: 32–34 in
- Leg spacing: legs at corners; add a center leg on long runs over 60 in
Soil Volume
A 4×2×1 ft box holds about 8 cubic feet. That’s roughly 225 liters. Buy three 75-liter bags or mix your own by bucket.
Planting Notes
- Lettuce: 8–10 in apart, 8–12 in deep
- Basil: 12 in apart, 10–12 in deep
- Tomato (compact): one plant per corner, add a short stake
- Strawberries: 10–12 in apart, mulch to keep fruit clean
Why This Build Works
The frame rides on thick legs that resist twist. Slatted bottoms drain fast yet hold mix with the fabric liner. The height saves your back. The shelf keeps tools handy without clutter. You can paint pine, oil cedar, or leave the wood raw and let it silver. The dimensions fit standard boards, so there’s little waste and few tricky cuts.
Next Steps
Pick lumber, cut the rails, and set the frame. Tie in the legs, add braces, and line the box. Fill with the mix that suits your crops. Water deep and plant. If you want more growing space, build two and arrange them as a U on the patio with a small gap for a stool. The same plan scales to a balcony box or a long deck trough, and the method stays the same: square frame, strong legs, clean drainage, breathable liner, living soil.