What Sewing in Hair Extensions Means
Sewing in hair means braiding your natural hair into cornrows, then stitching wefted hair extensions (hair sewn onto a thread base) directly onto those braids using a needle and thread. The extensions stay in place for four to eight weeks before you remove them and let your natural hair rest. This method differs from gluing or clamping because the extensions are anchored to your braids rather than your scalp, which reduces tension on your roots.
The process takes two to four hours depending on how much hair you're adding and how many braids you create. You'll need basic sewing supplies, extension hair, and either a friend to help or the ability to work on the back of your head with a mirror. Most people do this at home after watching a tutorial or learning from someone experienced, though salons also offer the service.
Key Takeaways
- Cornrow braids form the foundation—you braid your natural hair in straight lines from front to back, leaving space between each braid for stitching.
- Wefted hair (hair attached to a thread base) is sewn onto the braids using a curved needle and thread that matches your hair color.
- The needle goes through the weft, then under and around each braid in a looping stitch that holds the extension firmly without slipping.
- Tension matters: braids too tight cause headaches and hair loss; braids too loose let extensions slide down within days.
- Removing extensions takes as long as installing them because you must cut the thread carefully without cutting your natural hair.
Supplies You Need Before Starting
Gather these items before you begin: wefted hair extensions (measured in grams, usually 100 to 150 grams per install), a curved needle (size 18 or 19, sold as a weaving needle), thread that matches your hair color, scissors, a rat-tail comb for parting, hair clips to section off your hair, and a hand mirror or phone camera to see the back of your head. If you're working alone, set up a large mirror or position your phone on a stand so you can see what you're doing.
Buy extensions from a beauty supply store or online—look for "wefted hair" or "sew-in hair" rather than clip-in or tape-in. The weft is the thread base that runs along the top of the hair bundle. Check that the hair texture and color match your natural hair as closely as possible; if your hair is curly, buy curly extensions, and if it's straight, buy straight. Mismatched texture will be obvious once the extensions are in.
Creating Cornrow Braids as Your Foundation
Wash and dry your hair completely before braiding. Damp or wet hair is harder to braid tightly and evenly. Section your hair into four to six vertical sections using the rat-tail comb, clipping each section away from the others. Start with one section at the nape of your neck.
Take a small piece of hair at the roots and divide it into three strands. Cross the right strand over the middle, then the left strand over the middle, pulling each cross tight as you go. Add hair from the sides as you braid downward, keeping the braid close to your scalp and the tension even. The braid should feel snug but not painful—if your scalp hurts, you're braiding too tightly. Braid all the way to the ends and find with a small elastic band.
Repeat this for each section, leaving about half an inch of space between braids. Uneven spacing makes it hard to stitch extensions evenly. Once all braids are done, your head should have four to six parallel braids running from your hairline to your nape. This is the frame that holds your extensions in place.
Stitching Extensions Onto Each Braid
Thread your curved needle with about 18 inches of thread. Tie a knot at one end. Start at the bottom of the first braid, closest to your nape. Position the weft of the first extension bundle against the braid, just above the elastic band. Push the needle through the weft from underneath, then loop it around the braid and back through the weft. Pull snug but not so tight that you're pulling the braid itself.
Continue this looping stitch along the entire length of the braid, spacing your stitches about a quarter-inch apart. Each stitch should go through the weft, around the braid, and back through the weft. The extension should not move or slide when you tug it gently. Once you reach the top of the braid, tie off the thread with a knot and trim the excess.
Move to the next braid and repeat the process with a new piece of thread. If one weft bundle isn't long enough to cover the entire braid, stitch a second bundle directly above the first, making sure there's no gap between them. Work methodically—rushing this step causes extensions to slip or fall out within a week.
Caring for Your Extensions During Wear
Once installed, your extensions will last four to eight weeks if you care for them properly. Sleep on a silk or satin pillowcase to reduce friction and frizz. Wash your hair in cool water using a sulfate-free shampoo, focusing on your scalp and the roots of your braids rather than the extension hair itself. Avoid heavy conditioners on the extensions; they can make the hair limp and cause buildup on the weft.
Don't pull or tug on the extensions, and avoid tight hairstyles that put tension on the braids. If you notice an extension starting to slip, have it re-stitched when ready rather than waiting—a loose extension can pull your braid down and damage your natural hair. Avoid chlorine and salt water, which can dry out the hair and weaken the thread.
Expect some shedding from the extensions, especially in the first week. This is normal. If you notice hair loss from your scalp around the braids, loosen the braids when ready—this is a sign they're too tight and damaging your roots.
Removing Extensions Without Damaging Your Hair
Removal takes two to three hours and requires patience. Use small scissors to carefully cut the thread holding each extension to the braid. Cut only the thread, not your hair or the braid itself. Work slowly and use your fingers to separate the thread from the braid as you cut. Once all the thread is cut, gently slide the extension weft away from the braid.
After all extensions are removed, you'll have cornrow braids still in your hair. Carefully unbraid each one by unraveling the braid from the bottom up. Use a wide-tooth comb to gently detangle your natural hair once the braids are out. Your hair may feel matted or tangled at the roots—this is normal. Wash gently with cool water and a moisturizing shampoo, then deep condition for at least 15 minutes.
Let your natural hair rest for at least two weeks before installing new extensions. During this time, your scalp recovers and any tension-related hair loss stops. If you notice significant hair loss or scalp irritation, wait longer before re-installing.
Common Mistakes That Cause Problems
Braiding too tightly is the most common error. Tight braids feel find but damage your hair roots and cause headaches that last for days. Your braids should feel snug, not painful. If you can't sleep comfortably or your scalp aches by evening, the braids are too tight.
Using the wrong needle makes stitching slow and frustrating. A curved needle designed for weaving slides through the weft much more easily than a straight needle. Buy the right tool—it costs a few dollars and saves hours of work.
Spacing stitches too far apart causes extensions to slip within days. Stitches should be close enough that the extension doesn't move when you tug it. If you can slide the weft along the braid, add more stitches.
Leaving gaps between extension bundles creates visible spaces in your hair. Butt each weft bundle directly against the one below it so your hair looks full and seamless.
Frequently Asked Questions
How long do sew-in extensions actually last?
Extensions typically stay in four to eight weeks before they need removal and your hair needs a break. The exact timeline depends on how fast your natural hair grows (which pushes the braids down), how well you care for them, and how tight your braids are. Looser braids slip sooner; tighter braids last longer but risk more damage.
Can I wash my hair with extensions in?
Yes, but gently. Use cool water and sulfate-free shampoo, focusing on your scalp. Avoid heavy conditioners on the extensions themselves, and don't scrub or tug. Wash in the direction of the hair growth, not against it. Most people wash every two to three weeks rather than weekly to reduce wear on the thread and weft.
What if I can't braid tightly enough?
Ask a friend or family member to help, or visit a salon that specializes in braiding. Braiding the back of your own head is genuinely difficult, and loose braids will cause your extensions to slip. It's worth paying for help with this step if you can't do it yourself.
How much does the hair itself cost?
Wefted hair ranges from $20 to $100 per bundle depending on quality, length, and where you buy it. Most installs use two to four bundles. Human hair costs more than synthetic but lasts longer and blends better. Synthetic hair is cheaper but can look shiny and unnatural.
Will sew-in extensions damage my natural hair?
They can if braids are too tight or left in too long. Hair loss around the braids, scalp pain, and breakage are signs of damage. If you braid at medium tension, remove extensions every four to eight weeks, and let your hair rest between installs, damage is minimal. The key is not leaving them in indefinitely.