How to sew a zippered mattress cover with an L-shaped zipper

Make a custom-fit mattress cover with a long L-shaped zipper so it slips on and off easily. It suits confident beginners who can sew straight seams and handle a zipper foot. You need your mattress measurements, fabric, a long zipper tape and a sewing machine.

How to Sew a Zippered Mattress Cover | DIY Custom Mattress Cover Pattern Tutorial - Sewing Tutorial, by Home Decor Projects on YouTube. 9 min 5 s.

12 chapters. Tap a step to jump to it.Chapters from the creator
Video length
9 min 5 s
Time to do it
3 hours
Difficulty
Medium
Steps
10

What you need

Steps

  1. Measure the length, width and depth of your mattress. Add seam allowance to each measurement and write the numbers down before you cut anything.

  2. Draw the pattern pieces on paper or directly on the fabric with chalk. Mark the corner positions and where the zipper will run.

  3. Cut the top panel, the side panels and the bottom panel. Cut carefully along the lines so the corners line up later.

  4. Sew the side panels into a box shape and stitch the corners so they fit the mattress depth. Press the seams flat.

  5. Finish the raw edges with a serger or a zigzag stitch to stop the fabric fraying. Do this before you attach the zipper.

  6. Pin the long zipper tape along the marked opening, starting at one corner and bending it around the L shape. Baste it in place first.

  7. Sew the zipper tape to the fabric with a zipper foot, keeping the seam even around the corner. Remove the basting stitches.

  8. Join the top and bottom panels to the zippered side piece. Match the corners and pin before sewing.

  9. Topstitch along both sides of the zipper for a neat, flat finish. Keep the stitching line straight and close to the teeth.

  10. Slide the zipper slider onto the tape and close the cover. Sew the corner seams shut and turn the cover right side out.

Tips and common mistakes

Baste the zipper before final stitching so you can adjust the L-shaped bend without unpicking.

Use a zipper foot so the needle sits close to the teeth and the seam stays straight.

Test the cover on the mattress before you close the last corner seam.

Questions

Can I make this cover without a serger?

Yes. A zigzag stitch along the raw edges works as a fray-stopping finish if you do not own a serger.

What zipper length do I need?

Measure the full opening path around the L shape and buy zipper tape slightly longer, then trim the excess after the slider is on.

Will this fit a foam mattress?

Yes. The method works for foam mattresses, daybeds, bench cushions and RV mattresses as long as you use your own measurements.

This guide was drafted from the video's details and general task knowledge. It has not been checked against the full video. Check the video and relevant product instructions before following a procedure. Report a correction.

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