How to Do a Line Up: Barber Edge Up Guide

A line up, also called an edge up, shapes and sharpens the front hairline, the temples, and the sideburns into clean, defined edges. It is one of the most visible indicators of a barber's skill level because the symmetry (or lack of it) is immediately apparent when you see the client from the front.

The Three Edges of a Line Up

The Front Hairline

The front hairline is the most prominent edge and the most sensitive. It defines the top of the forehead and frames the face. A front hairline that sits too low removes the client's forehead. One that sits too high makes the forehead appear larger. The right position follows the client's natural hairline or a slight clean-up of it.

The natural hairline is the most important reference point. For most clients, the goal is to define what is there: sharpen the edge of the existing hairline, remove any small hairs growing below it, and create a clean, defined boundary. Moving the hairline significantly from its natural position should only happen if the client explicitly requests it and you confirm the expectation.

The Temple Corner

The temple corner is the point where the front hairline meets the side hairline. It is typically a slight curve or right-angle corner. The angle and height of this corner significantly affects the overall shape of the head and face from the front.

On most clients, the temple corner sits just above and forward of the top of the ear. A common line up error is taking the temple corner too low or too far back, which shortens the apparent length of the face or creates an asymmetric temple on the two sides.

Check temple symmetry from directly in front of the client before finalizing. The two temple corners should be at equal heights. One corner higher than the other is the most common line up asymmetry complaint.

The Sideburn

The sideburn edge runs vertically in front of the ear. The sideburn's bottom edge defines how low the sideburn sits relative to the ear. Standard sideburn length is level with the middle of the ear or just below. Confirm the client's preference before trimming.

Sideburns need to match on both sides and need to be consistent with the cut. A client with a low fade does not typically want long sideburns. The sideburn length should make visual sense with the rest of the cut.

Tools for a Line Up

T-liner / T-blade trimmer: The standard tool for all three edges. The flat, wide T-blade creates a sharp, straight edge and gives clear visibility of where the line is being cut. Most barbers do all line up work with a T-liner.

Straight razor (optional): Used to define the hairline sharper than a trimmer can achieve, particularly for clients who want a very precise, razor-sharp edge. The straight razor removes the stubble below the defined line and creates the high-contrast edge that reads as very clean in photos and in person.

Trimmer guard 0.5 or 1 (optional): Some barbers use a light guard pass on the hairline area to clean up the transition before doing the hard edge. This is a stylistic choice and not required for most clients.

The Line Up Sequence

Step 1: Assess before cutting

Look at the client's natural hairline with the hair dry and unstyled. Identify where the front hairline sits, where the temple corners are, and what the sideburn level should be. Take 30 seconds here. The assessment prevents cutting a line before you know where it should go.

Step 2: Front hairline first

Start the line up at the front hairline. With the T-liner, run the edge along the natural hairline. Move in short, controlled strokes from the center outward toward the temples on both sides. Work slowly. The front hairline does not correct easily once cut.

Hold the trimmer so the blade is perpendicular to the scalp at the hairline. This produces a defined edge rather than a faded blur. The blade runs along the skin just at the hairline boundary.

Step 3: Temple corners

After the front hairline is defined, connect it to the temple corners. The corner is a transition from the front hairline edge running horizontally to the sideburn edge running vertically. It is typically a slight curve or a gentle right angle. Match both sides before finalizing.

Step 4: Sideburns

Define the vertical sideburn edge and the sideburn bottom line. Check that both sideburns are at equal height from the front.

Step 5: Clean up with razor (if using)

Apply a small amount of shave gel to the area just below the defined edges. A straight razor pass removes the stubble and produces a high-contrast defined line. Work in short strokes following the line, not across it.

Common Line Up Mistakes

Asymmetric temple corners: One temple corner higher or more angled than the other. Caused by not checking symmetry from the front before finalizing. Fix: check from the front before doing the razor cleanup, when there is still room to adjust.

Moving the hairline too far back: Especially on clients with a rounded natural hairline. Removing the small hairs that form the front boundary of the natural hairline pushes it back. Use conservative cuts on the front boundary.

Inconsistent sideburn height: Left and right sideburns at different levels. Check from the front with a horizontal visual reference.

Blurry edges instead of sharp ones: Caused by the blade not being perpendicular to the scalp at the hairline, or by moving too fast. Slow, deliberate strokes with the blade at 90 degrees to the scalp produce the sharpest edges.

CADMEN Training

Line up technique, edge definition, and symmetry assessment are part of every CADMEN fade class. Approximately 10 live haircuts per student. Maximum 3 students. Book at academy.cadmen.ca/in-person-training.

Fade class: $1,750 + HST (small group) or $1,950 + HST (1-on-1).

Frequently Asked Questions

What is a line up in barbering?

A line up (also called an edge up) is the sharpening and defining of the front hairline, temple corners, and sideburns into clean, precise edges. It is typically done with a T-liner trimmer and optionally finished with a straight razor for a sharper definition. It can be done as a standalone service or as part of a full haircut.

What tool do you use for a line up?

A T-liner (T-blade trimmer) is the standard tool for line up work. The flat, wide T-blade creates sharp edges and gives good visibility of where the line is being cut. A straight razor is optionally used after the T-liner to produce an even sharper, high-contrast edge by removing stubble below the defined line.

How do you keep a line up symmetrical?

Check from directly in front of the client at each stage, especially after setting the temple corners. The two temple corners should be at the same height from the front view. Check both sideburns from the front before finishing. Never finalize the line up from the side angle only, as side-angle viewing masks asymmetry between the two sides.

How often should you get a line up?

Every 1 to 3 weeks. The front hairline shows regrowth visibly within 7 to 10 days. Clients who want a sharp, maintained edge will book more frequently. A line up as a standalone service (no full haircut) is a common booking for clients who maintain clean lines between full cuts.

What is the difference between a line up and a haircut?

A haircut changes the length and shape of the hair across the top and sides. A line up defines the edges: the front hairline, temple corners, and sideburns. A full haircut typically includes a line up at the end. A standalone line up is done without changing the cut length, just sharpening the edge definition that has grown in since the last haircut.