How To Make Curtains With Lining | A Complete Guide

You’ve probably noticed ready-made curtains often look flat and let light bleed through at the edges. The thin lining that comes attached barely stops a streetlamp, let alone the morning sun. Making your own with proper lining solves both problems — and it’s not as complex as it sounds.

This guide walks you through the process step by step, from choosing the right lining fabric to sewing clean, finished panels. You’ll get a pair of curtains that hang well, block light where you want them to, and look like they came from a custom workroom.

Why Lining Changes Everything

Curtain lining is a secondary layer of fabric attached to the back of a curtain panel. It does more than just hide the wrong side of your main fabric. A good lining extends the life of the curtain by protecting it from sun damage, adds insulation, and gives the curtain a fuller drape.

Blackout lining takes this further. It’s a three-layer coated acrylic suede compound designed to block light and provide thermal insulation, as blackout thermal lining definition explains. These linings can block up to 99% of natural light, which makes them ideal for bedrooms or nursery spaces where darkness matters.

Without lining, even heavy decorator fabric lets light pass through the weave. Lining also protects the main fabric from dust and fading. Your curtains will look good for years longer with a proper liner stitched in place.

Why The Easy Method Works Best

Many DIY tutorials complicate the process by trying to line each edge individually. The easiest approach is to sew the main fabric and lining together at the long edges, turn the whole panel right side out, and finish the bottom hem separately. It’s clean, quick, and produces consistent results.

The basic method looks like this:

• Lining offset: When laying out fabric, place the lining bottom about 1.5 inches shorter than the main fabric. This prevents the lining from peeking out the front at the hem.
• Right sides together: Pin the fabric and lining with right sides facing each other. Sew down both long sides and across the top. Leave the bottom open.
• Turn and press: Pull the fabric through the open bottom and press the seam edges flat. The lining naturally falls shorter than the curtain face.
• Hem the lining separately: Fold and hem the lining’s bottom edge so it sits 1 to 2 inches above the main fabric hem. No mitred corner needed.

The separate bottom hem is what gives a professional look. You can adjust the lining exact height to match your curtain length after the main structure is sewn.

Materials and Cutting Notes

You need two fabrics: the curtain fabric (decorator weight) and the lining fabric. Cotton lining breathes better than polyester, but blackout lining uses a coated layer that seals out light regardless of the base fiber. For blackout options, choose a three-pass coated fabric specifically labeled for light blocking.

Calculate your yardage by measuring the window width and height, then adding for hem allowances and heading. The rule is that curtain width should be roughly 2 to 2.5 times the window width for proper fullness. Lining width is typically cut slightly narrower than the main fabric so it does not show at the front edges of the finished curtain.

Joining fabric widths is common for wide windows. Sew vertical seams with a straight stitch and press them open. The lining widths should also be joined if needed, but keep the lining narrower overall to hide behind the main fabric.

Step-By-Step Sewing Process

The process follows eight clear stages. Work on a large, flat surface — a dining table or clean floor works well. Pin generously to keep both layers aligned during sewing.

1. Measure and cut: Measure window width and drop. Add for hem allowances (4 inches for bottom hem, 2 inches for side hems) and heading depth. Cut lining fabric to the same width minus 2 inches and the same drop minus 2 inches.
2. Create side hems: Fold and press 2-inch hems on both sides of the curtain fabric. Stitch close to the inner fold. Repeat for the lining fabric with 1-inch side hems.
3. Sew fabric and lining together: Place curtain fabric right side up, lining on top right side down. Pin down the long sides and across the top. Sew a ½-inch seam down both sides and across the top.
4. Turn right side out: Pull the curtain through the open bottom. Use a blunt tool to push out corners. Press thoroughly, especially along the seams.
5. Hem the bottom: Fold the curtain bottom hem up 1 inch, then another 3 inches. Stitch close to the first fold. For the lining hem, fold up 1 inch and stitch — this keeps it shorter.
6. Attach header tape: Pin pencil pleat or rod pocket tape along the top edge. Stitch across the top and bottom edges of the tape. Draw up cords for pleating.
7. Finish with pressing: Press the final curtain lightly over a pressing cloth if needed. Hang immediately or store on a curtain hanger.

If you prefer a wider top treatment, you can hand-finish the heading tape after the main fabric and lining are joined, which is the professional workroom method. The key is that all seams are enclosed and hidden inside the lining.

Blackout Versus Thermal Lining

The difference between these two types matters when you choose your lining fabric. Blackout curtains are designed primarily to block out light, while thermal curtains are intended to keep a room warm or cool. The thermal vs blackout curtains comparison makes this distinction clear.

Blackout lining works by using a dense coated layer that no light passes through. It is the best choice for bedrooms, media rooms, or any space where darkness is the priority. It also provides some insulation as a side benefit.

Thermal lining uses thicker fabric or an interlayer to trap air. This is better for external doors or large windows that lose heat. However, it does not necessarily block light completely, so for sleep spaces you want a dedicated blackout lining.

For most DIY curtain projects, blackout lining is the better all-round choice. It blocks light, offers insulation, and protects the main fabric from fading. Thick lining works best with heavier main fabrics to ensure the curtain hangs properly without buckling at the edges.

The Bottom Line

Sewing lined curtains is a weekend-friendly project that upgrades the look and function of any room. The key steps are attaching lining offset by 1.5 inches, stitching layers together at the long edges, turning right side out, and hemming the lining separately. Blackout lining gives the best light control and insulation for most homes.

Before you start, measure your window twice and confirm your lining fabric is at least 2 inches narrower than the main curtain fabric. Customizing the finished width and hem drop for your specific window ensures the curtains hang flat and operate smoothly over your curtain rod.