Building and stretching your own canvas frame is straightforward with the right tools, and worth doing if you need a size nobody sells or you want to paint on it yourself. Here is the full process, plus what to choose for wood and fabric.
What you will need
- Stretcher bars or lengths of wood
- A saw — a mitre saw gives the cleanest corners
- Measuring tape and a carpenter's square
- Wood glue, plus screws or corner braces
- Screwdriver or drill, and sandpaper
- Canvas fabric
- Canvas stretcher pliers
- Staple gun and staples
- Canvas tensioning wedges
Building the frame
1. Measure and cut the wood
Cut your bars to the finished canvas size. Precision here decides everything downstream — a frame that is out of square cannot be fixed later by stretching.
2. Assemble it
Join the pieces into a rectangle or square and check every corner with a carpenter's square before the glue sets. Wood glue at the joints adds meaningful strength.
3. Reinforce the corners
On anything large, add corner braces or screws. Stretched canvas pulls constantly inward, and an unreinforced corner will eventually warp.
4. Sand the edges
Sand the outer edges and corners smooth. Any sharp edge will show through the canvas as a line, and can cut the fabric under tension.
Stretching the canvas
5. Lay it out
Put the fabric face down on a clean flat surface and place the frame on top, with enough excess on all four sides to fold over and grip.
6. Start stretching
Fold the excess over one side, pull it taut with stretcher pliers, and staple. Work from the centre of each side outwards, not along one side at a time.
7. Work around the frame
Alternate opposite sides as you go — top, bottom, left, right — keeping tension even. This is the step that decides whether you get a drum-tight surface or wrinkles in the corners.
8. Trim the excess
Cut away surplus fabric for a clean edge.
9. Add tensioning wedges
Optional, but useful on larger frames. Tapped into the corners, they let you tighten the canvas again later as it relaxes with humidity.
10. Prime it
If you are painting on it, finish with a layer of primer and sand back any rough patches.
Choosing the wood
| Wood | Characteristics | Best for |
|---|---|---|
| Pine | Affordable, light, easy to cut. Soft, so it dents. | Most frames, especially large ones |
| Cedar | Naturally resists decay and insects. Reddish, aromatic. | Humid rooms |
| Oak | Dense, hard, prominent grain. Heavy. | Small frames where durability matters |
| Poplar | Light, straight-grained, uniform. | A balance of cost and quality |
Choosing the canvas fabric
- Cotton. The usual choice. Smooth, fine grain, good for detailed work. Heavier weights last longer.
- Linen. Stronger and more textured, and more expensive. Preferred for work meant to last.
Whichever you pick, heavier weight fabric holds tension better and is more forgiving if your stretching is not perfectly even.
Or let us do it
If you want the result rather than the process, we stretch and frame every canvas by hand in our Twickenham studio, using thicker wood as standard. See personalised canvas prints.