Light Rail Molding for Kitchen Cabinets: Sizes, Prices and How Much to Order

Light rail molding is a slim strip of trim, sold in the same finish as your doors, that fastens along the bottom front edge of the wall cabinets and drops just below them. It does two jobs: it hides under-cabinet light fixtures and their wiring from anyone sitting or standing back from the counter, and it gives the bottom of the upper run a finished edge the way crown finishes the top. Most of the rails we sell come in 96-inch sticks priced from $97.68 to $188.50 depending on brand and finish. Below are the profiles we actually stock, how to work out how many sticks a kitchen needs (with a worked example), what changes on frameless cabinets, how it pairs with task lighting, and when a valance over the sink is the better piece.

Table of Contents

• What Light Rail Does Under a Wall Cabinet
• Light Rail Molding Profiles, Sizes and Prices We Sell
• How Much to Order: A Worked Example
• Corners, Exposed Ends and Joints
• Framed vs. Frameless Cabinet Bottoms
• Under Cabinet Light Rail and Task Lighting
• Cabinet Valance Over a Sink Window
• The Installation Sequence to Give Your Installer
• Frequently Asked Questions
• Put the Trim on the First Order

What Light Rail Does Under a Wall Cabinet

Standing at the counter, you never see the underside of the wall cabinets. Sit at the island or table and your eye is below the cabinet bottom, and an unscreened LED channel or puck shows as a bright strip with its lens, clips and cord. A rail fixed along the front edge blocks that line of sight, so what you see is the glow on the backsplash rather than the fixture making it. The glossary entry has the one-line definition; this guide is about choosing and ordering it.

The second job is cosmetic. The bottom edge of the uppers is a hard line at a seated person's eye level, and a rail in the door's profile turns it into deliberate trim: furniture-like in a traditional kitchen, simply crisp in a shaker or slab one.

From our own jobs, the decision comes down to three questions:

• Are under-cabinet lights going in? If yes, the rail is close to essential. If the lights are a "maybe later", order the rail now anyway; matching a finish a year on is harder than ordering it with the cabinets.
• Is there seating with a view of the wall cabinets? An open plan with stools opposite the run is the case where fixtures are on display every day.
• How much backsplash will you lose? The rail eats into the visible tile from the top by roughly its drop. It matters only on a patterned backsplash planned to a full-tile course.

Answer no, no and "it matters" and you can leave it off; the cabinets are finished without it. Light rail is one of the trim pieces covered in our overview of kitchen cabinet molding types, alongside crown, scribe and quarter round, and the opposite end of the base cabinet has its own trim in our toe kick dimensions guide.

Light Rail Molding Profiles, Sizes and Prices We Sell

Every rail below comes in the cabinet line's own finish, so it matches the doors without finishing on site. Generic hardwood rails from millwork makers, some with a routed channel for LED tape, come unfinished, so they have to be stained or painted on site to sit beside a factory finish. Profiles are matched to the door family rather than chosen freely: Fabuwood's spec book says its LRM "has profile to coordinate with that of Door Style," and US Cabinet Depot offers two shapes per finish, a beveled rail and an angled one.

A few things the table does not show. Fabuwood's Allure rail "comes notched/with a lip to allow Light Rail to be installed at bottom of Face Frame and sit flush with door," which is why it lines up without packing strips on a framed box. The same spec book notes the rail "may be combined with any combination of trim moldings to create decorative stacked trim," so a traditional kitchen can add a batten under it (Allure BM3/4 is $44.20 a stick in Galaxy Frost). A few US Cabinet Depot finishes, among them Haven Ember, Oxford Mist and Oxford Toffee, run higher at $113.08 for the beveled rail and $128.48 for the angled one, and some finishes list only one of the two shapes. US Cabinet Depot's frameless Palermo and Torino lines have no rail in their spec books at all.

Which US Cabinet Depot shape? The beveled rail is the shallower of the two, a quiet chamfered edge that suits shaker doors and a slim LED channel. The angled rail is deeper and taller, which buys more screening for a puck or a thicker light bar. Fabuwood gives you one rail per door family, so the choice there is made when you pick the door. You can browse light rail by finish in the shop, or read the codes and drawings yourself in the Fabuwood Allure spec book and the US Cabinet Depot Shaker spec book.

How Much to Order: A Worked Example

Rail is sold by the stick but needed by the run, and the two do not divide neatly. Here is the method we use on quotes.

1. List every run of wall cabinets separately. A run stops wherever the rail stops: at a wall, at a window or range hood gap, at a tall cabinet, or at an exposed end.
2. Measure each run along the cabinet fronts, which is simply the sum of the cabinet widths. A run that ends at an exposed side also gets a return along that side, back to the wall. Standard wall cabinets in Fabuwood and in US Cabinet Depot's framed lines are listed 12 inches deep, and the door adds about ¾ inch in front of that, so count a return as 13 inches.
3. Add an allowance for every miter, about 2 inches per mitered end. A miter's long point runs past the cabinet corner by the depth of the rail, and you want room for a second try. A piece with only square ends gets about an inch, so it can be trimmed to fit between walls.
4. Fit the pieces into 96-inch sticks on paper. No piece can be longer than a stick, and offcuts are only useful if they are long enough for another piece.
5. Decide on a spare. On a kitchen with three or more miters, or a finish with a long lead time, one extra stick costs less than a delay.

The example. An L-shaped kitchen. On the sink wall, a 36-inch and a 30-inch wall cabinet run from the side wall to a 36-inch window. On the other side of the window, a 30-inch and a 24-inch cabinet run into the inside corner. The second wall starts in that corner with a 30-inch, a 36-inch and an 18-inch cabinet, ending at the refrigerator with an exposed side.

Divide 226 by 96 and you get 2.35. Three sticks work here, but only because of how the pieces nest:

• Stick 1: piece A (67″), leaving a 29″ offcut.
• Stick 2: piece B (56″) and piece D (15″), leaving 25″.
• Stick 3: piece C (88″), leaving 8″.

Move one cabinet and the plan changes. Make run C a 30 + 36 + 30 and its cut length becomes 100 inches, longer than any stick, so it has to be joined on a cabinet seam: a 33-inch piece from the corner (30 inches plus the miter and an inch for the joint) and a 69-inch piece to the end (66 plus the miter and joint). Three sticks still cover it, re-nested as A plus the return (82″), B plus the short piece of C (89″), and the long piece alone. But no offcut is now long enough to recut a botched miter on A, B or C, which is exactly the kitchen where we add a spare. That is why we draw the cut list rather than dividing.

What it costs. Three sticks of Fabuwood Allure LRM in Galaxy Frost come to $448.50, or $598.00 with a spare. The same three in US Cabinet Depot Shaker Grey are $293.04 for the beveled rail (Grey-LRM) or $335.28 for the angled one (Grey-ALRM). The 36-inch window gap gets a valance rather than rail; that is covered below.

If you are measuring the room yourself, our guide to measuring a kitchen for cabinets covers the wall survey, and the wall cabinet sizes guide lists the widths you will be adding up.

Corners, Exposed Ends and Joints

Most of the fitting effort goes where a run stops or turns.

Inside corners. Where two runs meet in a corner, the two rails meet in an inside miter, two 45-degree cuts. Corners are rarely perfectly square, so the installer cuts one side, offers up the other and adjusts; that is what the 2-inch allowance is for.

Exposed ends. When a run finishes in mid-air, beside a refrigerator, a hood or an open end, the rail wraps the corner: an outside miter at the front and a short return along the side back to the wall. Osborne Wood, which manufactures light rail moulding, describes exactly this in its how-to: cut opposing 45-degree miters so the rail turns the cabinet corner, with the small lip on the rail's face fitting over the cabinet's bottom corner to keep it aligned. Skipping the return and stopping the rail flush at the front shows its end grain and looks unfinished from the side.

Ends against a wall or tall cabinet. A square cut, butted tight. If the wall is out of plumb, a sliver of scribe molding closes the gap better than caulk on a coloured finish.

Ends at a window or hood gap. Square at the cabinet side. If a valance spans the gap, it sits between the two cabinet sides and the rail stops at the cabinet edge either side of it.

Joints in a long run. When a run is longer than a stick, the joint goes on a seam between two cabinets, never in the middle of a door. A glued scarf joint (two matching angled cuts) hides better than a square butt.

Open shelves at the end of a run. An open-end shelf wall cabinet has no door to hide behind, so check how its bottom meets the rail. Fabuwood's Allure spec book lists "Create Square Bottom Shelf for Light Rail Molding" as a separately priced modification on its open-end wall shelves; if the rail is to run on under one, put that modification on the order.

On stained finishes, ask your installer to seal or touch up every cut end before it goes up. A raw miter on a dark stain shows pale wood at exactly the height people look at.

Framed vs. Frameless Cabinet Bottoms

Whether your cabinets have a face frame changes how the rail attaches and how much lip it has to make. If you have not chosen a construction yet, our framed vs. frameless comparison covers the rest of the trade-offs.

Framed cabinets (Fabuwood Allure, US Cabinet Depot's framed lines and most of what we sell) have a hardwood face frame on the front of the box. The rail fastens to the bottom of that frame and the box floor behind it. Fabuwood's Allure rail is notched so it tucks under the face frame and lands flush with the door face; you get a clean line with no visible step.

Frameless cabinets (Fabuwood Illume and Ovela, plus the other European-style lines we carry) have no frame: the door covers the box edge and the underside is a flat panel flush with the front. With nothing to tuck under, the rail itself has to supply the entire drop. Fabuwood's Illume and Ovela spec books say to use LRM with STRM-8, a ¾ × 1¼-inch starter strip, "to install LRM to be flush with front of door." STRM-8 is $126.75 a stick in Illume Catalina and in Ovela's Bianco, Carbone and Grigio finishes, and $107.25 in Ovela Catalina Clubhouse Oak, and on Illume's Textured and Designer Collection door styles it ships already assembled to the rail rather than as a separate part. Budget for it as part of the rail on a frameless kitchen.

The fastening method changes too. Wolf's installation guide for its full-access (frameless) cabinets says light rail "will have to be screwed to the bottom of the case," and its drawing shows #7 flathead screws through predrilled 3/16-inch countersunk clearance holes, with the rail set 1/8 or 3/8 inch proud of the front depending on profile and flush to the side. The principle carries over to any frameless box: screws come up from inside the cabinet, heads hidden, and must stop short of the rail's face.

For the rest of what the frameless line offers, see the Illume review.

Under Cabinet Light Rail and Task Lighting

Lighting is the reason most people buy rail, so the two should be chosen together. Fixtures, colour temperature, brightness, drivers and switching are all in our kitchen task lighting guide. Here we only need the point where the light and the trim meet.

The drop rule. The rail hides a fixture only if its bottom edge sits lower than the lowest point of the fixture. On a frameless cabinet the rail and starter strip make up all of that drop; on a framed one, measure from the underside of the face frame, since that is where the rail hangs from. Hold the fixture's spec sheet height against the rail's section before ordering. A slim aluminium channel suits the shallower beveled or Fabuwood rail; a puck light or a thick hardwired bar often wants the deeper angled rail, or a rail with a batten stacked under it.

Mount the fixture at the front. A strip placed just behind the rail lights the front of the counter where you work, is hidden by the rail, and throws less glare off a glossy backsplash than one tight against the wall.

Watch the backsplash height. If tile is planned to a specific course or a full-height slab, give your tile setter the rail's finished underside height, not the cabinet's.

Cabinet Valance Over a Sink Window

Rail runs along the bottom of a cabinet. A valance does a different job: it spans an opening where there is no cabinet at all, most often the gap over a sink window between two wall cabinets. It fastens to the sides of the cabinets either side and hangs there as a face with no box behind it, carrying the horizontal line of the run across the window. Because it spans rather than sits on anything, the dimension that matters is the opening between the two cabinet sides, not the window or the sink. The valance glossary entry has the short version.

Valances also do lighting work. A strip or pair of pucks fixed behind one, sometimes called a light valance, lights the sink, a spot that otherwise gets no task light at all.

Each valance is made to a width and trims only so far, so order to the opening:

In our example kitchen, the 36-inch window opening takes a Fabuwood VAR36 as it comes, at $91.00. Mind the gap in the arched sizes: VAR36 covers 30 to 36 inches and VAR54 covers 48 to 54, so a 42-inch opening needs the taller paneled VARP42 or VARP48 or a straight VST96. If you want the line straight rather than arched, a VST96 cut down does it, at $188.50 with most of the stick left over. On US Cabinet Depot, the 48-inch Shaker valance only works on an opening from 45½ to 48 inches, so a narrower window needs a different answer; ask us before you order rather than discovering it on site.

Arched valances read traditional, and in a shaker or slab kitchen they can look dated. The straight valance in the cabinet finish is the safe choice for most current kitchens, and it lines up with the bottom rail so the run reads as one piece. Valances are on the valance page by finish.

The Installation Sequence to Give Your Installer

We design, quote and ship cabinets; your contractor or you install them. Rail is a fair DIY job for anyone who has run a miter saw, but the order of work matters more than the carpentry. Pass this sequence to whoever is doing it.

1. Before ordering: choose the under-cabinet fixtures and note their height. Pick the rail profile to suit. Decide where wires come through the cabinets and where the driver sits.
2. Rough-in: the electrician runs wiring to the wall cabinet locations while the walls are open.
3. Hang and level the wall cabinets, screw them together through the face frames or sides, and fix them to the studs. Rail will not pull a crooked run straight. Our cabinet installation guide covers this step.
4. Check the backsplash plan against the rail's finished underside and tell the tile setter.
5. Dry-fit the rail, starting from the inside corners and working out, so the miters are cut first and any trimming happens at the square ends.
6. Fasten it. Screws from inside the cabinet, up through the bottom into the rail, are the usual method because the heads stay hidden. Predrill, and check the screw length against the cabinet bottom plus the rail so nothing breaks through the face. Glue the miters and joints.
7. Fit the fixtures behind the rail and let the electrician connect them.
8. Touch up cut ends and any marks with the finish touch-up from the cabinet line.

Frequently Asked Questions

What is light rail used for on kitchen cabinets?

It hides under-cabinet light fixtures and their wiring from anyone whose eye is below the cabinet bottom, which is everyone sitting down, and it gives the bottom edge of the wall cabinets a finished trim line in the door's finish.

Do I need light rail if I don't have under-cabinet lights?

No. Without lights it is purely decorative. It can still be worth it in a traditional kitchen or one with seating that looks up at the cabinets, but the cabinets are complete without it.

How far should light rail hang below the cabinet?

Further than your fixture hangs down. Check the fixture's height on its spec sheet against the rail's section. Our rails' published sections run from 1½ × 1 inch (Fabuwood) to 1½ × 2 inches (US Cabinet Depot's angled rail); the deeper profiles suit pucks and thicker bars.

How many sticks of light rail do I need for a kitchen?

Draw a cut list. Add up each run of cabinet widths, add about 13 inches for each exposed-end return (cabinet depth plus the door) and about 2 inches per miter, and fit the pieces into 96-inch sticks. Our 18-foot L-shaped example needs three sticks.

What is the difference between light rail and a valance?

Rail runs along the underside of cabinets. A valance spans a gap where there is no cabinet, usually over a sink window, and is ordered to the opening width. They are often used together so the line carries across the window.

Can light rail go on frameless cabinets?

Yes, but the rail has to supply the whole drop because the box bottom is flush. Fabuwood pairs its Illume and Ovela rail with an STRM-8 starter strip so the rail sits flush with the door face. US Cabinet Depot's frameless lines offer no rail.

Can you add light rail after the cabinets are installed?

Yes. It screws up from inside the cabinet and needs nothing else to be undone. The risk is the finish: ordering later means matching a stain or paint batch, so we suggest putting it on the original order.

Should light rail match the crown molding?

It should match the finish and roughly the visual weight. A heavy crown over a hairline rail looks unbalanced, and a fussy rail under a plain crown looks like an afterthought. The molding overview shows how the pieces work as a set.

Put the Trim on the First Order

The cheapest way to get light rail right is to have it on the same drawing as the cabinets. Send us your wall measurements and the under-cabinet light you are considering, and our free 3D design service will draw the run with rail, returns and valance in place. A designer replies within one business day, and you get the design and an itemized quote, trim included, within 24–48 hours.

To see the finishes first, browse the Fabuwood Allure line or US Cabinet Depot, and order a door sample to check the colour in your own light. We design, quote and ship cabinets nationwide; installation is done by your contractor or by you. Questions about a fixture height or an awkward window? Reach us through the contact page or call 609-900-3358. Contractors ordering for several kitchens can ask about Captivating Pro.

Sources: Fabuwood Allure Galaxy Frost spec book (light rail and decorative moldings, valances); Fabuwood Illume and Ovela Catalina spec books (LRM, STRM-8, VST-6); US Cabinet Depot Shaker Grey spec book (mouldings, CUT84 mouldings, accessories); Wolf Home Products Transition Cabinetry Installation Guide, "Installing Light Rail"; Osborne Wood Products, "How to Use Light Rail Moulding" (archived January 2025). Prices are our displayed prices in the finishes named at the time of writing and change with the price list.