A lash fill is a top-up appointment where the technician removes grown-out extensions and replaces the ones that have shed, bringing the set back to full. Most studios recommend a fill every 2 to 3 weeks and price it by the time since your last visit. On US salon menus the median fill costs $70, against a median full set of $130. Past about 4 weeks, or with under half the set remaining, most studios charge for a new full set.
On this page
The first full set is the price everyone looks at, but fills are what you actually pay for extensions month after month. This guide explains how they work and how studios price them, using fill prices from 3,174 salon menus in our directory.
What is a lash fill?
Your natural lashes shed on a rolling cycle, and each extension goes with the lash it is attached to. After two or three weeks a set has gaps and some extensions have grown out from the lid and started to twist. At a fill, the technician cleans the lashes, removes any extension that has grown out, is twisted or is attached to a lash that is about to shed, and applies new extensions to the natural lashes that have grown in since. You leave with a full set again without starting from scratch.
How often should you get a fill?
Every two to three weeks is the standard recommendation, and it lines up with how sets behave: most people have lost a third or more of their extensions by the three-week mark. Going to two weeks keeps the set consistently fuller and the appointments shorter; three weeks is the usual compromise between upkeep and cost. Beyond four weeks there is usually too little left to fill. See how long lash extensions last for the week-by-week picture.
How much does a lash fill cost?
| Service | Median | Typical range | Menus |
|---|---|---|---|
| Fill | $70 | $55–$90 | 3,174 |
| Classic full set | $130 | $100–$160 | 1,970 |
| Full set, lowest listed | $130 | $100–$165 | 3,879 |
Prices come from salon menus checked in October 2026 (based on 3,174 salon menus for fills). Where a menu lists several fill prices, we record the lowest, which is usually the two-week fill. Over a year, a full set plus a fill roughly every three weeks is about 17 fills: at the medians, around $1,320 before tips. State and city figures are in lash extensions cost.
Why are fills priced by time?
Because the time since your last visit predicts how much work the fill is. A typical menu looks like this:
| Time since last visit | What the studio expects | Typical pricing |
|---|---|---|
| Up to 1 week | Nearly full set; a quick top-up | “Mini fill”, lowest price |
| 2 weeks | Around 70% remaining | Standard fill |
| 3 weeks | Around 50–60% remaining | Standard or “3-week” fill, slightly higher |
| 4 weeks | Under half remaining | Often priced as a new full set |
Some studios price by the percentage of extensions remaining instead of the calendar, and a few do both. Either way, the lesson is the same: a fill booked on time is cheaper than one booked late.
What happens at a fill appointment?
- Cleanse. Lashes are washed to remove oil and makeup; some studios charge extra if you arrive with heavy makeup.
- Removal. Grown-out, twisted or loose extensions are removed with a remover or gently banded off.
- Fill. New extensions go on the natural lashes that have grown in, matched to the existing style and map.
- Check and brush. The technician checks isolation and brushes through.
Allow 45 to 90 minutes. Arrive with clean, product-free lashes and no eye makeup.
When does a fill become a new set?
Two triggers. First, time or coverage: past four weeks, or with fewer than about half your extensions left, there is more to apply than to fill, and studios charge accordingly. Second, age of the set: even with regular fills, most studios recommend a full removal and fresh set every two to three months, because adhesive and the oldest extensions build up and the technician can’t properly see the natural lashes. If your studio says it is time for a fresh set, that is usually why.
How do you keep a set full between fills?
Daily cleansing with an oil-free cleanser, brushing, no oil near the eyes, no mascara, and sleeping on your back. The full routine is in lash extension aftercare. Good aftercare is the difference between a two-week fill and a three-week fill, which over a year is several appointments.
Can you change style at a fill?
Within limits. Going from classic to hybrid, or adding a little length at the outer corners, is easy at a fill. Going from classic to full volume, or changing the map completely, usually needs a removal and a new set so the whole eye matches. Tell the studio what you want when you book so they allow the right time.
If you are weighing up the ongoing cost, our lash lift vs lash extensions guide compares a fill schedule with a treatment that needs none. Otherwise, find lash extensions near you.
Frequently asked questions
Can I get a fill from a different studio?
Yes, though many studios charge more for a “foreign fill” because they are working on another technician’s set and may need to remove unsafe or poorly placed extensions first. Some decline altogether.
How long does a fill take?
Usually 45 to 90 minutes, depending on how much has shed and whether it is a classic or volume set. Volume fills take longer.
Do I need to remove my old extensions before a fill?
No. The technician removes only the grown-out ones and fills the gaps. A full removal happens when you want a fresh set.
What is a mini fill?
A short top-up, usually within a week or so of the last appointment, priced below a standard fill. Some studios offer it for events or for people who want their set always at its fullest.
Related guides
How Long Do Lash Extensions Last?
Typical retention, fill timing, and what makes a set shed early.6 min readHow Much Do Lash Extensions Cost?
Classic, hybrid and volume full sets and fills, priced from salon menus.6 min readLash Extension Aftercare: How to Make Your Set Last
The first day, the daily routine, and the habits that cost you lashes.6 min readThis guide is general information, not medical advice. If you have an eye condition, allergies or sensitive skin, speak to a doctor or a licensed lash technician before any lash treatment.