What's inside
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A compact cedar porch swing is a manageable weekend build if you can make straight cuts and drill accurate holes. This plan makes a roughly 42-inch-wide seat for one or two people, with a slatted back and chain hangers. Cedar is light and naturally suited to outdoor use, but it splits easily near screw holes; careful drilling and sound overhead support matter more than fancy joinery.
Contents
Plan and sizing
Finished dimensions are about 42 inches wide, 20 inches deep, and 22 inches high at the back. The seat is 18 inches deep; the remaining depth is the back, tilted slightly for comfort. Allow at least 30 inches of clear space in front of and behind the swing, and keep the seat at least 18 inches above the floor so it can move without scraping.
This is a suspended seat, not a porch structure. The beam, joists, or freestanding frame carrying it must be sound and suitable for a moving load. Do not hang it from fascia, a thin porch ceiling, or a single unverified joist. If you cannot identify the structure and its capacity, ask a qualified builder before drilling.
Materials and tools
Buy straight, dry cedar boards without loose knots where the hangers and rails will go. Roughly 30 board feet is a reasonable starting allowance, though stock sizes and defects change the yield. Use exterior-rated screws and bolts; ordinary interior screws can corrode or stain cedar.
- Two 2×4×8-foot cedar boards for the seat rails, back rails, and supports
- Six 1×3×8-foot cedar boards for seat and back slats
- One 1×4×8-foot cedar board for armrests and small blocks
- Four 3/8-inch-diameter galvanized or stainless through-bolts, washers, and locknuts for the side-frame joints
- Two rated swing-hanger assemblies, four rated chain lengths, or a compatible rated hanger-and-chain kit
- Exterior screws, a drill, bits, countersink, saw, tape measure, square, clamps, and sandpaper
Compare a rated porch swing hanger kit with separate hardware before buying. A kit can simplify matching parts, but check its stated load rating and installation requirements; a low price is no bargain if it omits fasteners or is intended for a different support.
Cut list and layout
Cut the main pieces to these dimensions, checking actual board width before laying out the slats. Nominal 1×3 lumber is often about 2½ inches wide. Slight spacing changes are fine as long as the seat remains evenly supported.
| Part | Quantity | Cut length |
|---|---|---|
| Seat rails, 2×4 | 2 | 40 inches |
| Back rails, 2×4 | 2 | 40 inches |
| Side supports, 2×4 | 2 | 20 inches |
| Seat slats, 1×3 | 7 | 42 inches |
| Back slats, 1×3 | 5 | 42 inches |
| Armrests, 1×4 | 2 | 20 inches |
Use the 20-inch side supports to connect each side of the seat and back. Dry-fit the rails and slats before fastening; cedar boards can vary enough that a cut list alone will not guarantee uniform gaps.
Build the seat and back
1. Cut the boards square, then ease sharp edges with 120-grit sandpaper. Reject pieces with large knots or splits at future bolt locations. Cedar is soft: clamp it gently, and support the board near the cut to limit tear-out.
2. Place the two seat rails parallel, 18 inches apart from outside to outside. Lay the seven seat slats across them, with about ⅜ inch between slats and a small, even overhang at each end. Predrill every screw hole with a bit slightly smaller than the screw shank, then fasten each slat to both rails with two exterior screws per rail. Do not drive screws close to a slat edge; split cedar will not hold well.
3. Assemble the back in the same way, with the back rails 16 inches apart. Space five slats evenly across them. Mark the slat positions with a spacer block rather than measuring each gap by eye. Predrilling is especially important near board ends.
Assemble the side frame
4. Stand the seat assembly on edge and position the back assembly behind it. Set the back at a comfortable recline, about 10 to 15 degrees from vertical. Fit one 20-inch side support on each side so it joins a seat rail to a back rail. The support should sit below the slats and be firmly against both rails.
5. Clamp each side, check that the seat and back are aligned, and drill through the support and rails. Use two 3/8-inch through-bolts per side, with washers under the heads and locknuts. Through-bolts resist the repeated rocking load better than screws alone. Tighten until snug, not so hard that the washer crushes the cedar.
6. Fit the armrests over the side supports and fasten them with predrilled exterior screws. Keep their front ends flush with the seat front, or shorten them slightly if they interfere with the chain path. Before hanging, sit on the swing while it is supported on a stable surface and check for sharp edges, loose joints, and uncomfortable pressure points.
Choose and install hangers
Hanger options involve a real trade-off. Chain is adjustable and easy to replace, while rope can be quieter but needs suitable outdoor-rated material and secure knots or splices.
| Option | Advantages | Watch-outs |
|---|---|---|
| Galvanized chain | Durable, adjustable, easy to inspect | Can squeak or rust; use compatible rated links |
| Stainless chain | Strong corrosion resistance | Costs more; verify every component is rated |
| Outdoor-rated rope | Quiet and comfortable in the hand | Can degrade or stretch; inspect and replace promptly |
For the chain version, use load-rated galvanized swing chain or compatible stainless chain. Match the chain, connectors, and hangers by rating rather than assuming the strongest-looking piece sets the capacity.
7. Locate the support members overhead and install the hangers exactly as their manufacturer directs. Their spacing should align with the swing’s side frames, typically near the ends of the seat rails. Use the specified structural screws or bolts; do not substitute drywall screws or ordinary deck screws. If the hanger instructions require a pilot hole, drill the stated diameter and depth.
8. Attach four chain runs so the swing hangs level, with the front and rear attachment points arranged to keep it from tipping. Raise the seat to about 18 inches above the porch floor, then adjust chain length and check that all links are fully seated. A second person should steady the swing while you inspect the connections.
Finish and first use
Sand to 150 grit and remove dust. Cedar can be left unfinished and allowed to weather gray; that is the cheapest low-maintenance choice, though stains and surface checks are normal. If you want to preserve more color, use an exterior finish labeled for cedar and follow its recoat schedule. A penetrating exterior cedar sealer is easier to refresh than a film finish that can peel, but it still needs periodic maintenance.
Before normal use, test the swing gently while keeping people clear of its path. Stop if the hangers shift, the support creaks, bolts loosen, or the frame racks sideways. Recheck fasteners and chain links after the first few uses and at the start of each outdoor season; movement loosens joints, and corrosion or wood splits can develop unnoticed.