Sew-in hair extensions — also called a weave or weft application — are one of the most popular and long-lasting ways to add length, volume, or both to your natural hair. Unlike tape-ins or clip-ins, they don't use adhesive or clips to bond to your strands. Instead, your hair is braided into cornrows close to the scalp, and wefts of hair are hand-stitched directly onto those braids.
The result is a secure, natural-looking style that can last six to eight weeks with the right care.
If you're new to sew-ins or thinking of doing your own install at home, this guide walks you through everything — from braiding to the final style.
What You'll Need
Before you begin, gather your tools. Having everything ready before you start makes the process much smoother.
Hair:
- 2–4 bundles of weft hair extensions (the number depends on your desired density and length)
- A closure or frontal if you want a seamless part or hairline
Tools:
- Curved weaving needle
- Weaving thread (cotton or nylon, matched to your hair colour)
- Rat tail or pintail comb
- Sectioning clips
- Edge brush and edge control
- Scissors
Optional but helpful:
- Braid spray or light oil for the scalp before braiding
- Fabric glue or a lighter to seal cut weft ends
- Nozzle bottle for scalp care during wear
Step 1: Prep Your Natural Hair
Start with clean, conditioned, and fully detangled hair. Installing a sew-in over dirty or dry hair can lead to matting, product buildup, and weakened strands during the weeks you'll be wearing it.
Once your hair is dry, apply a light moisturiser or braid spray from root to tip and detangle carefully before you begin braiding.
Step 2: Braid Your Cornrows
The cornrows are the foundation of your entire install. How flat and neat they are directly affects how your sew-in looks and how comfortable it feels.
- Use your rat tail comb to create a horizontal parting from ear to ear. Clip the top section away.
- Starting at the nape, braid your first cornrow horizontally across the head, keeping it as flat and close to the scalp as possible.
- Continue upward, row by row, with each cornrow running parallel to the one below.
- Leave the front section unbraided if you're planning a leave-out or applying a frontal.
- Keep tension consistent but not too tight — overly tight braids pull on the follicles and can cause breakage over time.
If braiding your own hair is difficult, consider having a stylist do this step. A clean, flat braid pattern makes everything that follows much easier.
Step 3: Measure and Cut Your Wefts
Before you pick up your needle, measure each weft against the cornrow it will cover.
Hold the weft across the row and cut it to match the width. Always cut from the end of the weft rather than across the middle to avoid unravelling. Once cut, seal the raw edge immediately — either with a small amount of fabric glue or by briefly running a lighter across it.
Keep your cut pieces organised in order so you know which weft goes on which row when you're ready to sew.
Step 4: Thread Your Needle
Cut a length of weaving thread around 45–60 cm (18–24 inches) and thread your curved needle, knotting the end securely. You can double-thread for extra hold if you prefer.
Match your thread colour as closely as possible to both your natural hair and the wefts — this prevents thread showing through once the extensions are in.
Step 5: Sew in Your First Weft
Start at the nape and work upward.
- Position your first weft along the first cornrow at the back.
- Hold it firmly against the braid with one hand.
- Push the curved needle through the weft and under the cornrow, then back up through the weft.
- Pull the thread through and tie a knot at the start to anchor it.
- Continue along the weft using an overcast stitch — going in and out through the weft and over the braid at even intervals of about 1–2 cm.
- At the end of the weft, knot the thread securely and cut.
The stitch goes through the weft and around the braid beneath it, locking the hair firmly in place. The tighter and more even your stitching, the more secure your install will feel.
Step 6: Work Your Way Up Row by Row
Repeat the measuring, cutting, and sewing process for each cornrow, moving from the nape toward the crown. As you get higher on the head, wefts may need to curve slightly to follow the shape — that's completely normal. Trim to fit rather than forcing a straight weft to bend.
For extra density or fullness, you can layer two wefts over the same row in the mid-section of the head, where volume is most visible from the front.
Step 7: Apply Your Closure or Frontal
If you're using a closure or frontal to create a natural-looking part, this is the final piece to sew in.
For a closure: Position it at the crown where your part will sit. Sew around the perimeter of the closure base, stitching it securely to the braided hair beneath. Blend the edges with your leave-out or lay them flat with edge control.
For a frontal: A frontal covers the entire hairline from ear to ear. Stitch it down carefully around the perimeter. Many people use a combination of sewing and lace adhesive along the hairline for an extra-seamless finish.
Step 8: Style and Finish
With all your wefts in, you're ready to style.
- Trim the extensions to your preferred length if needed.
- Use a flat iron or curling wand to blend the extensions with any leave-out.
- Apply a small amount of serum or lightweight oil for shine.
- Lay your edges with an edge brush and control product for a polished, finished look.
How Long Does a Sew-In Last?
A well-installed sew-in typically lasts six to eight weeks. Some women push to ten weeks, but beyond that, new growth can start to mat around the braids, making removal more difficult and potentially damaging.
To keep your sew-in looking fresh between washes:
- Sleep with your hair in a loose braid or bun and use a satin bonnet or pillowcase.
- Wash every one to two weeks using a gentle, sulphate-free shampoo applied directly to the scalp through the tracks with a nozzle bottle.
- Moisturise your scalp lightly through the tracks — don't neglect it just because it's hidden.
- Keep heat styling under 180°C (350°F) to preserve the integrity of the wefts.
Common Mistakes to Avoid
Braiding too tight. Tight braids may look neat at first, but the continuous tension on your follicles over several weeks causes breakage — particularly along the hairline.
Skipping scalp care. Your natural hair still needs moisture while the sew-in is in. Dry, neglected hair underneath will be noticeably weaker when you take it out.
Leaving it in too long. Past eight weeks, new growth wraps around the braids and makes safe removal much harder.
Not sealing your weft cuts. Unsealed ends shed almost immediately and tangle badly with the rest of your hair.
Using cheap thread. Low-quality thread breaks sooner than you'd expect, causing wefts to loosen or slip mid-wear.
Does Hair Quality Make a Difference?
Significantly. The quality of the hair you sew in determines how it holds up through washing, heat styling, and daily wear over those six to eight weeks.
At Amara Crown Hair, our wefts are made from 100% virgin Indian human hair — collected ethically from a single donor, with the cuticles intact and aligned in the same direction. Cuticle alignment is what prevents tangling and matting during wear. It also means the hair responds to heat and colour the way your own hair does, so your install looks natural from day one and stays that way.
Our most popular textures for sew-in wefts are straight, body wave, and deep wave — available in lengths from 10 to 30 inches. Browse our weft collection → Shop Wefts
Frequently Asked Questions
How many bundles do I need for a sew-in? For a full sew-in with a closure, most people use 2–3 bundles for lengths up to 18 inches, and 3–4 bundles for 20 inches and above. If you're doing a frontal install, add one extra bundle for fullness around the hairline.
Can I do a sew-in myself? The sewing is absolutely something you can learn to do at home. Braiding your own cornrows is the trickier part. A common approach is to have a stylist do the cornrow base, then sew in the wefts yourself.
Does a sew-in damage your hair? Not if it's done correctly. Damage comes from braiding too tight, wearing the style too long, or neglecting the hair underneath during wear. With proper care, a sew-in is one of the more protective extension methods available.
How do I remove a sew-in? Use a seam ripper or small scissors to carefully cut the thread along each row — work slowly to avoid catching your natural hair. Once the wefts are removed, unravel your cornrows gently with your fingers, then wash, deep condition, and let your hair breathe before reinstalling.
Can I wash my hair with a sew-in in? Yes — and you should. Wash every one to two weeks, applying diluted shampoo to the scalp using a nozzle bottle. Rinse thoroughly and always dry your scalp fully afterwards. Damp braids beneath a sew-in can lead to scalp odour and irritation over time.
What's the difference between a sew-in and a quick weave? A sew-in is stitched onto braids and is one of the most secure methods available. A quick weave bonds wefts directly to a protective cap using glue — it's faster but less durable and uses adhesive close to the scalp.
0 comments