A simple timber workbench is one of the most rewarding DIY projects a homeowner can tackle — and once it's done, you'll wonder how you ever managed without one. With some basic carpentry skills, a weekend, and a trip to your local timber merchant or hardware store, you can build a solid, long-lasting bench that suits your garage perfectly.
What You'll Need
Before you start, gather your materials and tools. For a standard bench roughly 2400 mm long × 600 mm deep × 900 mm high (a comfortable working height for most adults), you'll need:
Timber (H3 treated for ground contact legs, H1.2 or untreated for the frame and top):
- 4 × legs: 90 × 90 mm timber, cut to ~870 mm (allowing for the top thickness)
- Frame rails: 90 × 45 mm framing timber
- Bench top: 40 mm thick hardwood, LVL, or two layers of 19 mm structural plywood glued and screwed together
Hardware:
- 100 mm and 75 mm structural screws (e.g. Buildex or similar)
- M10 coach bolts and nuts for leg-to-rail joints (optional but recommended for strength)
- Wood glue (PVA)
Tools:
- Circular saw or drop saw
- Drill/driver
- Tape measure, square, pencil
- Clamps
- Spirit level
You can source timber and hardware from Bunnings, Mitre 10, or PlaceMakers. Ask the staff to help you select the right timber grade for each part of the bench.
Planning Your Bench
Think about how you'll use the bench before you cut anything:
- Height: 900 mm suits most people for general work. If you're tall, go up to 950 mm. For heavy hand-planing, lower is better.
- Depth: 500–600 mm is practical without wasting floor space.
- Length: Match it to your wall space. 2400 mm is a common starting point.
- Storage: Will you add a lower shelf? Plan for it now by adding a lower rail between the legs at around 200–300 mm off the floor.
Sketch a simple plan on paper with all dimensions before you buy timber — this avoids waste and costly mistakes.
Step-by-Step Construction
1. Cut Your Timber to Length
Measure and cut all pieces before assembly. Double-check each measurement. Use a square to ensure your cuts are straight.
2. Build the Two End Frames
For each end, join two legs with a top rail and a bottom rail using 100 mm screws and wood glue. Pre-drill to avoid splitting. Check for square using a tape measure diagonally — both diagonals should be equal.
3. Connect the End Frames with Long Rails
Stand the two end frames upright and connect them with the long front and back rails at the top and bottom. Use coach bolts at the leg joints for maximum rigidity. Check the whole frame is level and square before the glue sets.
4. Add the Bench Top
If using plywood, glue and screw two 19 mm sheets together, staggering the joints. Clamp overnight. Once set, lay the top onto the frame and screw down from above, or use pocket screws from below for a cleaner finish. Ensure the top overhangs the front by 20–30 mm so clamps can grip the edge.
5. Add a Lower Shelf (Optional)
Cut sheet plywood or timber boards to fit between the lower rails and screw in place. This adds useful storage and stiffens the whole structure.
6. Finishing
Sand the top smooth, starting with 80-grit and finishing with 120-grit. Apply two coats of a hard-wearing finish — a penetrating oil or a floor-grade polyurethane works well. Resene and Wattyl both stock suitable timber finishes. Leave the underframe unfinished or paint it for protection.
Fixing the Bench to the Wall
For extra stability — especially if you'll be doing heavy work or mounting a vice — fix the back of the bench to the wall studs using 100 mm screws or coach bolts through the back top rail. Locate studs with a stud finder before drilling. This also prevents the bench from tipping forward.
Timber Treatment and NZ Conditions
NZ garages can be damp, especially in winter. Use H3 treated timber for any legs that sit directly on a concrete floor, or raise the legs on metal post bases to keep timber off the slab. This is consistent with guidance from BRANZ on protecting timber in wet or humid environments. If your garage is unlined and exposed to the elements, treat all timber surfaces.
When to Call a Professional
Building a freestanding workbench is a straightforward DIY project that doesn't require a building consent or a licensed tradesperson. However, consider calling a qualified carpenter if:
- You want to bolt the bench to a concrete floor (requires correct anchor bolts and technique)
- You're planning a built-in bench with cabinetry, electrical outlets, or plumbing (electrical and plumbing work is restricted work under NZ law and must be carried out by a licensed electrician registered with the EWRB or a licensed plumber registered with the PGDB)
- You're unsure about structural connections or timber selection
You can find qualified local carpenters and tradespeople on tradedirectory.co.nz.
