The Basic Process: What Happens During Installation

A sew-in starts with braiding your natural hair into cornrows, then stitching wefted hair (hair sewn onto a thread base) directly onto those braids using a needle and thread. The whole process takes two to four hours depending on how many braids you need and how much hair you're installing. You'll need a sewing needle, thread that matches your hair color, wefted hair bundles, and either a professional stylist or someone trained in the technique.

The hair stays in place because it's anchored to your braids, not glued to your scalp. This means less tension on your natural hair than glue-in extensions, though the weight still matters. Most sew-ins last four to eight weeks before they need tightening or removal, depending on how fast your natural hair grows and how well you maintain them.

Key Takeaways

  • Cornrow braids form the base, and the wefted hair is stitched directly onto each braid using needle and thread.
  • Installation takes two to four hours and should be done by someone experienced, because improper tension can damage your natural hair.
  • You'll need to sleep on a silk or satin pillowcase and avoid pulling or tugging on the braids to prevent breakage.
  • Sew-ins last four to eight weeks before they need tightening as your natural hair grows out from the scalp.
  • Removal requires cutting the thread carefully and unraveling each stitch—rushing this step can cause hair loss.

Preparing Your Hair Before Installation

Start with clean, dry hair. Wash your hair two to three days before your appointment so your scalp has time to produce natural oils, which protect against irritation from the braids. If you wash the day of installation, your hair will be too slippery for the braids to hold properly.

Detangle thoroughly with a wide-tooth comb, working from the ends up to the roots. Any knots left in your hair will tighten during braiding and can cause breakage when they're removed later. If your hair is very short or fine, discuss this with your stylist beforehand—some hair types need fewer, thicker braids to support the weight of the extensions.

How the Braiding Foundation Works

Your stylist will section your hair and braid it into cornrows that run from your hairline toward the back of your head. The number of braids depends on how much hair you're adding and the look you want. Typically, four to six braids across the crown and two to four along the sides is standard, but this varies.

The braids should be tight enough to hold the stitched hair securely, but not so tight that they pull on your scalp. If your braids feel painful after a few hours, tell your stylist when ready—this tension can cause traction alopecia (hair loss from constant pulling) over time. The braids themselves should lie flat against your head and feel snug but not painful.

Stitching the Wefted Hair Onto the Braids

Once the braids are done, your stylist threads a needle and begins stitching the wefted hair onto each braid. They'll start at one end of a braid, push the needle through the weft (the thread base of the extension), then through the braid itself, and pull the thread tight. This is repeated along the entire length of each braid, creating a find anchor.

The stitching pattern matters. A skilled stylist uses small, even stitches spaced about a quarter-inch apart so the weight is distributed evenly. If stitches are too far apart, the hair can slip or create bald spots. If they're too tight, they can cut off blood flow to your scalp. This is why experience matters—a rushed or untrained installation can damage your hair.

Once all the wefts are stitched down, your stylist will trim and style the extensions to blend with your natural hair. Some people add a closure (a piece of hair that covers the braids at the hairline) for a more finished look, though this is optional.

Daily Care and Maintenance During Wear

Sleep on a silk or satin pillowcase every night. Cotton pillowcases create friction that causes frizz and can loosen the stitches over time. A silk bonnet or wrap also works if you prefer not to buy a special pillowcase.

Wash your hair every seven to ten days with sulfate-free shampoo and conditioner. Focus the shampoo on your scalp and braids, not the hair itself—the extensions don't need as much washing. Use cool or lukewarm water, never hot, because heat can loosen the stitches. Avoid heavy oils or products that build up on the braids, as this can cause itching and scalp irritation.

Don't pull, tug, or play with the braids. Constant tension on the braids can cause your natural hair to break at the root. If you feel itching at the base of the braids, use a spray bottle with water and a few drops of tea tree oil to soothe your scalp—don't scratch.

When to Get Them Tightened or Removed

As your natural hair grows, the braids move away from your scalp, and the stitched extensions loosen. Most people need tightening every four to six weeks. During tightening, your stylist removes the old stitches, moves the wefts closer to your scalp, and re-stitches them. This takes one to two hours.

After eight to twelve weeks, most people remove the sew-in entirely and either install new ones or take a break. Leaving them in too long can cause matting and damage to your natural hair underneath. Removal should be done carefully—your stylist will cut each stitch and gently unravel the thread without pulling your natural hair. Rushing removal is the most common cause of breakage and hair loss.

What Can Go Wrong and How to Avoid It

The most common problems are braids that are too tight, stitches that are placed too far apart, and poor scalp hygiene. Tight braids cause pain and hair loss. Loose stitches cause the extensions to slip or create bald spots. A dirty scalp under the braids can lead to buildup, itching, and infection.

Choosing an experienced stylist is the best prevention. Ask to see photos of their work, and don't go to someone just because they're cheap. A bad installation can take months to recover from. If you experience pain, excessive itching, or notice hair loss after installation, remove the sew-in and give your hair a break before trying again.

Frequently Asked Questions

Can I wash my hair with a sew-in in?

Yes, wash every seven to ten days with sulfate-free products and cool water. Avoid scrubbing the extensions themselves—focus on your scalp and braids. Pat dry gently instead of rubbing, and let your hair air-dry when possible.

How long does a sew-in last?

Most sew-ins last four to eight weeks before they need tightening. You can keep them in longer with maintenance, but after twelve weeks most people remove them to let their natural hair rest. The timeline depends on how fast your hair grows and how well you care for them.

Will sew-ins damage my natural hair?

Sew-ins can damage your hair if the braids are too tight, the stitches are placed poorly, or you don't maintain them properly. Proper installation, regular washing, and avoiding tension on the braids keeps damage minimal. Taking breaks between installations also helps your natural hair recover.

What's the difference between sew-ins and glue-ins?

Sew-ins are stitched onto braids, while glue-ins are bonded directly to your natural hair with adhesive. Sew-ins generally cause less damage because they don't pull on individual strands, but they take longer to install and require more maintenance.

Can I do a sew-in myself?

You can braid your own hair, but stitching the extensions on is difficult without practice. Most people need a second person to reach the back of their head and keep the tension even. If you do try, go slowly and use a thimble to protect your fingers from the needle.