Sewing in hair extensions involves braiding your natural hair into cornrows, then stitching wefted hair onto those braids with needle and thread
The process starts with creating a foundation of tight cornrows that run across your scalp in the pattern where you want the extensions. Once the braids are in place, you use a curved needle and thread (usually nylon or polyester) to stitch wefted hair—hair sewn onto a strip of fabric—directly onto each braid. The stitches anchor the weft to the braid, and the extensions hang from there. The whole installation typically takes two to four hours, depending on how much hair you're adding and how many braids you need.
This method is different from glue-in extensions or clip-ins because the hair is mechanically attached rather than bonded or clipped. That means it can stay in place for six to eight weeks with proper care, and you can remove it without damaging your natural hair if the installation was done correctly.
Key Takeaways
- Cornrow braids form the base that holds the sewn-in wefts, so they must be tight enough to support the weight of the extensions without slipping.
- You need a curved needle, thread, and wefted hair bundles; the needle curves so you can stitch through the weft and around the braid without poking your scalp.
- Each weft is stitched down with multiple passes of thread to distribute the weight and prevent the extensions from sliding or bunching.
- Proper tension while braiding and stitching is critical—too loose and the extensions slip, too tight and you risk pulling your natural hair and causing breakage.
- Removal requires cutting the thread carefully and unbraiding your hair; rushing this step can damage your natural hair or cause unnecessary breakage.
Preparing your scalp and creating the cornrow base
Start with clean, dry hair. Wash your hair a day or two before installation so it has some natural oils to protect your scalp, but not so much buildup that the braids won't hold. Section your hair into the areas where you want the braids to run—typically four to six braids depending on how much coverage you need and the thickness of your hair.
Braid each section tightly from the scalp down, keeping the braid as close to your head as possible. The braid doesn't need to go all the way to the ends of your hair; it can stop a few inches down. The tighter the braid, the better the weft will hold. Loose braids will cause the extensions to slip within days. If you're doing this yourself, start with fewer, thicker braids rather than many thin ones—they're easier to keep tight and still provide plenty of surface area for stitching.
Stitching the wefted hair onto the braids
Thread a curved needle with about an arm's length of thread. Knot one end. Position the weft against the braid and push the needle through the weft and around the braid, then back through the weft on the other side. Pull the thread snug but not so tight that you're crushing the braid. Make another stitch a quarter-inch away from the first one, and repeat this pattern along the entire length of the weft.
Most installers do at least two passes of stitching per weft—one on the top edge and one on the bottom—to distribute the weight evenly. If you're adding a lot of hair or using thick wefts, three passes is better. After each pass, knot the thread off and start a new section rather than running one long thread the entire length; this way, if one stitch comes loose, the whole weft doesn't unravel.
The stitches should be close enough that there's no gap between them, but not so close that you're piercing the same spot twice. Aim for stitches about a quarter-inch apart. If the stitches are too far apart, the weft will buckle between them. If they're too close, you're weakening the thread and the weft material.
Spacing and placement of multiple wefts
If you're using more than one weft per braid, leave about half an inch of space between each weft so you can move your scalp and the braids can flex without the wefts rubbing against each other. Stacking wefts too close together creates bulk and makes the extensions feel stiff.
The first weft should sit close to your scalp—about a quarter-inch away—so the roots of your natural hair can cover it. Subsequent wefts move down the braid. If you're adding length, the last weft should end where you want the extensions to finish. Leave enough of the braid below the last weft so you have something to hold onto when it's time to remove the extensions.
Blending and styling after installation
Once all the wefts are stitched down, your natural hair at the roots will blend with the extensions. You can style the hair when ready, though waiting a day or two gives your scalp time to adjust to the tension. Blow-dry, curl, or straighten as you normally would. The extensions will move and feel like your own hair once you start styling.
For the first week, avoid sleeping on the extensions in a way that puts pressure on the braids—try sleeping on your back or using a silk pillowcase to reduce friction. Wash your hair in cool water and use a sulfate-free shampoo; hot water can loosen the stitches over time. Condition the extensions but avoid conditioning the braids themselves, as that can make them slippery.
When to call a professional instead of doing it yourself
If you've never braided your own hair or stitched extensions before, the learning curve is real. Uneven braids, loose stitches, or braids that are too tight can all cause problems within the first week. Many people find that having a stylist do the installation is worth the cost because a professional knows how to braid at the right tension and stitch in a way that distributes weight evenly.
If you do decide to install them yourself, practice the braiding and stitching on a friend or a practice head first. Watch videos from experienced installers and take your time—rushing leads to loose stitches and braids that slip. If you get halfway through and realize the braids are too loose, it's better to take them out and start over than to stitch extensions onto a weak foundation.
Removing sewn-in extensions safely
When it's time to take the extensions out, use small scissors or a seam ripper to carefully cut the thread holding each weft. Cut only the thread, not the weft or your hair. Work slowly and section by section. Once all the thread is cut, gently unravel each braid with your fingers or a comb. This step takes patience—rushing it can snap your natural hair.
After removal, your natural hair may feel tender at the roots because it's been under tension. Wash gently, deep condition, and give your hair a break of at least two weeks before installing new extensions. This rest period lets your scalp recover and your natural hair regain its strength.
Frequently Asked Questions
How long do sewn-in extensions last?
Sewn-in extensions typically last six to eight weeks before they need to be reinstalled or removed. The timeline depends on how fast your hair grows, how well you care for them, and how tight the original braids were. If the braids loosen, the extensions will start to slip sooner.
Can you wash your hair with sewn-in extensions?
Yes, you can wash your hair, but use cool or lukewarm water and a gentle, sulfate-free shampoo. Avoid scrubbing the braids directly; focus on the scalp and the lengths of the extensions. Hot water and harsh shampoos can weaken the thread and loosen the stitches over time.
What happens if a stitch comes loose?
If you notice a weft starting to slip or a stitch coming undone, you can re-stitch it yourself if you're comfortable with a needle and thread, or visit a stylist to have it repaired. The sooner you fix it, the less likely the entire weft will come loose. Ignoring it will cause the weft to slide further down the braid.
Do sewn-in extensions damage your natural hair?
Sewn-in extensions don't damage your hair if they're installed and removed correctly. Damage happens when braids are too tight, stitches are placed incorrectly, or removal is rushed. Proper installation, regular care, and a rest period between installations help keep your natural hair healthy.
Can you reuse the extensions after removal?
Yes, if the wefts are still intact and the hair is in good condition, you can have them re-stitched onto new braids. However, the hair may have shed or tangled during wear, so inspect it carefully before reinstalling. Some people get two or three uses out of a set of extensions before the hair quality declines.