Building your own bed frame is one of the most rewarding DIY projects a beginner can take on. The construction is fundamentally simple — a rectangular box with legs and a slat system — but the scale of the build, the structural requirements, and a few key joinery decisions separate a frame that lasts decades from one that creaks and wobbles within a year. This guide covers all three common Australian bed sizes with a comparison table, then walks through a complete step-by-step build for the most popular size: Queen.
Size Comparison: Queen, King, and Double
| Size | AU Mattress Dimensions | Frame outer dimensions (approx.) | Main timber needed | Centre support required? | Est. cost (AU$, Bunnings) | Difficulty |
|---|---|---|---|---|---|---|
| Double | 1380 × 1880mm | 1470 × 1970mm | 4× 2.1m lengths 140×45mm DAR pine | Optional but recommended | $120–$160 | Beginner |
| Queen | 1530 × 2030mm | 1620 × 2120mm | 5× 2.4m lengths 140×45mm DAR pine | Yes — 1 centre beam + 1 leg | $160–$220 | Beginner–Intermediate |
| King | 1830 × 2030mm | 1920 × 2120mm | 6× 2.4m lengths 140×45mm DAR pine | Yes — 1 centre beam + 3 legs | $220–$280 | Intermediate |
Note on Australian bed sizes: Australian mattress dimensions differ from US sizes. An Australian Queen is 1530×2030mm; a US Queen is 1524×2032mm — nearly identical. However, an Australian King (1830×2030mm) is significantly wider than a US King (1930×2030mm). Always measure your mattress before starting your cut list.
Tools You Will Need
- Drop saw or circular saw with guide
- Drill/driver with bits
- Pocket hole jig (Kreg R3 or similar — highly recommended for bed frame joinery)
- Tape measure, combination square, pencil
- Orbital sander or sandpaper (80, 120, 180-grit)
- Clamps (at least 4 × 600mm bar clamps)
- Safety glasses and hearing protection
Queen Bed Frame: Complete Step-by-Step Guide
The following build is for an Australian Queen (1530×2030mm). The frame uses 140×45mm DAR pine for all structural members and 140×19mm pine for slats.
Step 1: Cut All Timber to Length
Cut the following pieces:
- 2× long side rails: 2030mm (full mattress length)
- 2× end rails: 1530mm (fits between the long rails, so inner dimension is 1530mm, outer is 1530 + 45 + 45 = 1620mm)
- 1× centre support beam: 1440mm (fits between long rails with a small gap for installation)
- 4× corner legs: 90×90mm × 220mm
- 1× centre leg: 90×90mm × 220mm
- 2× slat ledger strips: 38×19mm × 2030mm
- 14× slats: 140×19mm × 1530mm
Pre-drill tip: Before any assembly, pre-drill all screw holes with a 3mm bit. Pine has a tendency to split along the grain, especially at the ends of boards — near joints, where splitting is most likely to happen. This single step prevents the most common beginner mistake in timber frame building.
Step 2: Prepare Pocket Holes
Using your pocket hole jig set to the 45mm stock setting, drill two pocket holes at each end of both end rails and the centre beam. These join into the face of the long side rails. Drill from the inside face of each piece so the holes are concealed once the frame is assembled. Pocket hole joints are ideal for bed frames: they are strong, fast to assemble, and — critically — the screws can be removed to disassemble the frame for moving. Use 50mm coarse-thread pocket screws for softwood.
Step 3: Attach the Slat Ledgers
The slat ledger strips support the slats from underneath and are fixed along the inner face of each long rail. Clamp one ledger in position with its top edge sitting 19mm below the top of the rail — this creates a rebate so the slats sit flush with or just below the rail top, ensuring the mattress has a flat, even surface. Glue and screw with 40mm screws at 250mm intervals. Repeat for the other long rail.
Step 4: Assemble the Main Rectangle
Stand both long rails on edge, inner faces facing each other, 1530mm apart (inner measurement). Position the head and foot end rails between them. Apply PVA wood glue to all mating faces, then drive the pocket screws. Work quickly — PVA has a working time of about 10 minutes before it starts to set.
Getting it square: After assembling, immediately check the diagonals by measuring corner to corner in both directions. If the diagonals are equal, the frame is square. If they differ, apply gentle pressure to the longer diagonal corner until they equalise, then leave the frame flat on the floor to dry. A square frame is non-negotiable — a twisted frame will never sit flat and the mattress will eventually show the difference.
Step 5: Install the Centre Support Beam
The centre beam spans the short dimension of the bed, positioned at the midpoint of the long rails (1015mm from each end rail for a Queen). Fix it using joist hangers (Mitek ULHB or equivalent, available at Bunnings hardware) on each end, attached to the inside face of the long rails. Alternatively, drill two pocket holes into each end of the centre beam and screw into the long rails from the beam end. The top of the centre beam must be level with the tops of the slat ledgers.
Step 6: Attach the Legs
Position the four corner legs at the outside corners of the frame. Each leg attaches to two rails simultaneously at the corner — use two 120mm structural screws driven through the face of the rail into the top of the leg, plus a metal angle bracket on the inside corner for secondary support. The legs should sit flush with the outside faces of the rails.
Attach the centre leg under the centre beam, at the midpoint of the beam (approximately 715mm from each long rail). Fix with two 120mm screws through the beam into the top of the leg, plus angle brackets on both sides.
Bed bolt hardware tip: For a take-apart design, use bed bolt hardware (also called connector bolts or knock-down bolts) instead of screws at the corner joints. A bed bolt system uses a bolt driven through a pre-drilled hole in the outer rail, threading into a barrel nut recessed in the end grain of the inner rail. The joint is extremely strong, can be assembled and disassembled dozens of times without damage to the timber, and leaves no visible hardware on the outside face. Find bed bolt kits at specialty hardware stores or online.
Step 7: Install the Slats
Place the slats across the ledgers and centre beam, starting from the head end. The maximum allowable gap between slats for most mattress warranties is 75mm. For a Queen with 14 slats of 140mm width, this spacing works out comfortably within the limit.
Foam spacer trick: Rather than measuring each gap individually, cut a scrap piece of 50×50mm pine offcut to use as a spacing jig. Hold it between slats as you position each one — you will maintain perfectly consistent spacing across all 14 slats without any measuring. Fix each slat with one 40mm screw through the slat into the ledger at each end. Do not glue slats — they need to be removable.
Step 8: Attach the Headboard
There are two main approaches for headboard attachment:
Integrated frame posts: Before finishing, drill two vertical posts (90×45mm DAR pine, 900–1000mm tall) to the outside face of the head-end rail. Space these 200mm in from each end. The posts form mounting points for a panel headboard — ply, upholstered foam panel, or timber planks — using carriage bolts or pocket screws. This method makes the headboard part of the bed frame structure.
Wall-mounted French cleat: Cut a 45-degree bevel along the top edge of a 90mm-wide pine board and screw it to the wall at the correct height. A matching board on the back of the headboard panel hooks over it. The headboard is wall-supported, not bed-supported, which gives you flexibility to change headboard styles without rebuilding the frame.
Step 9: Sand and Finish
Sand the whole frame through 80, 120 and 180-grit. Wipe down with a damp cloth and let dry before applying any finish. For most bedroom furniture, a satin water-based polyurethane is the best balance of durability, ease of application and appearance — two coats with a light 240-grit sand between coats.
Common Mistakes to Avoid
- Skipping pre-drilling: Pine splits predictably near end grain. Pre-drill every hole, every time.
- Not checking for square: Check after every glue-up, not just at the end.
- Over-tightening pocket screws: Drive them until snug, not until the timber crushes. Overtightening strips the hole and weakens the joint.
- Forgetting the centre leg: Any frame wider than 1200mm needs centre support. This is a structural requirement, not optional.
- Painting without priming: Knots in pine will bleed through paint without a shellac-based primer coat first.
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