Before you start, gather all necessary materials:

Wood Frame:

- 2x4 or 2x6 lumber for the frame

- Plywood for the seat base

Upholstery:

- Foam padding (2-4 inches thick, depending on desired comfort)

- Fabric for upholstery (choose a durable and washable option)

- Batting (optional, for a softer finish)

Hardware:

- Wood screws

- Wood glue

- L-brackets for added support

- Legs (you can use wooden legs, metal hairpin legs, or even repurposed furniture legs)

Tools:

- Circular saw or hand saw

- Drill

- Screwdriver

- Staple gun

- Measuring tape

- Sandpaper

- Upholstery needle and thread (if needed)

Begin by sketching your design. Decide on the dimensions based on your space and how you plan to use the chaise. A typical chaise lounge is about 5-6 feet long and 2-3 feet wide. Consider whether you want it to be straight or curved, and whether you want armrests.

1. Cut the Lumber:

Measure and cut the lumber for the base frame according to your design. You'll need a rectangular base that supports the seat and a backrest that may be adjustable.

2. Assemble the Frame:

 Use wood screws and wood glue to assemble the frame. Ensure it's sturdy by using L-brackets at the corners. If you're adding armrests, attach them now.

3. Add the Seat Base:

Cut a piece of plywood to fit the frame and secure it with screws. This will support the foam padding and upholstery.

1. Cut the Backrest:

Depending on your design, cut a separate piece of plywood for the backrest. This can be attached at a fixed angle or made adjustable.

2. Attach the Backrest:

 Secure the backrest to the frame with screws. If it’s adjustable, consider using hinges for flexibility.

Attach your chosen legs to the bottom corners of the frame. Ensure they are evenly spaced and secured firmly to support the weight of the chaise. If you’re using wooden legs, make sure they are sturdy enough to handle regular use.

1. Cut the Foam:

Cut the foam padding to fit the seat and backrest. You can stack multiple layers for added comfort.

2. Secure the Foam:

Use spray adhesive or glue to attach the foam to the plywood.

3. Wrap with Batting:

For a softer look, wrap the foam in batting. This step is optional but recommended for a polished finish.

4. Upholster the Frame:

 Lay your fabric over the foam, ensuring it covers all edges. Pull the fabric tightly and secure it to the underside of the frame using a staple gun. Start from the center and work your way out to avoid wrinkles.

5. Finish the Edges:

 Fold the fabric neatly at the corners and staple it down. Trim any excess fabric for a clean look.

Once the upholstery is complete, check for any loose staples or rough edges. You might want to add decorative pillows or throws to enhance comfort and style. Consider applying a wood finish or paint to the frame if you want a more polished appearance.

To keep your chaise lounge looking great, regularly vacuum the fabric and clean any stains with appropriate cleaners. If you used wood, occasionally polish it to maintain its shine and protect it from scratches.