How to Make Wood Blinds: Slats You Build, Hardware You Buy

Real DIY wood blinds means building your own slats and finishing them — almost nobody builds a working cord-lock and tilt mechanism from scratch. The realistic version of this project is: mill and finish the slats yourself, then mount them on a purchased headrail/tilter hardware kit.

That distinction matters because a lot of “make your own blinds” guides skip straight from cutting slats to “attach the lift cord and cord lock” as if that hardware assembles itself. A cord-lock tilter is a small geared mechanism — building one that reliably holds a stack of slats at any angle isn’t a realistic weekend project even for an experienced woodworker. Below is the version that actually works: real wood species tradeoffs, the routed-vs-unrouted slat decision that determines how much light leaks through, and where to buy the hardware instead of trying to fabricate it.

Tools and Materials

You’ll need a table saw or circular saw with a straightedge guide (for ripping slats to consistent width), a miter saw or hand saw (for cutting slats to length), 120- and 220-grit sandpaper, wood stain or paint, and a clear finish. For routed slats you’ll also need a drill press or hand drill with a forstner bit sized to your cord diameter — a forstner bit leaves a clean, flat-bottomed hole instead of the ragged exit-tearout a twist bit leaves in thin stock.

Measuring Your Window

For an inside mount, measure the width at the top, middle, and bottom of the window opening and use the narrowest of the three — window frames are rarely perfectly square, and building to the widest measurement means the blind won’t fit at its tightest point. Measure height at the left, middle, and right, and use the longest of those three. For an outside mount, add at least 3 inches of width beyond the frame opening on each side to block light gaps, and mount the headrail 2 to 3 inches above the frame.

Choosing Slat Width and Wood Species

Residential wood blinds are almost always cut to 1-inch or 2-inch slat width — 2-inch is the standard for most windows since it needs fewer slats and fewer ladder cord holes per blind; 1-inch is reserved for smaller windows or a more traditional look. Space slats so each one overlaps the next by roughly 1/4 inch when closed, which for 2-inch slats means spacing ladder cords about 1.75 inches apart center to center.

On species, basswood is the standard choice for a reason that goes beyond “it’s light and easy to cut”: basswood moves less across humidity swings than oak or cherry. A blind slat that swells and shrinks with the seasons is what eventually makes wood blinds bind in their headrail or crack along the grain at the cord holes — a real durability tradeoff most buying guides leave out when they recommend oak for its strength. Pine works but is soft enough to dent from a fingernail catching a slat while adjusting the tilt. Cherry looks excellent stained but costs meaningfully more per board foot for a part of the house (window slats) that gets touched more than it’s admired up close.

Cutting the Slats

1. Rip your stock to slat width (1″ or 2″) using a table saw with a straight fence, or a circular saw against a clamped straightedge.
2. Cut each slat to your outside-mount or inside-mount width from the measuring step, minus about 1/8 inch total to allow the slats to swing freely inside the headrail without binding against the brackets.
3. Sand every slat’s edges and both faces, working from 120 to 220 grit — a sharp slat edge is what nicks fingers during daily use, not just an aesthetic issue.
4. Round over each slat’s long edges very slightly with sandpaper or a small roundover bit; a hard 90-degree edge is what chips first when slats knock together while tilting.

Routed vs. Unrouted Slats

This decision determines how the ladder cord attaches, and most “make your own blinds” guides skip it entirely:

• Routed slats have a hole drilled straight through, so the vertical ladder cord runs through the slat itself. This is simpler to build (drill and thread), but every hole is a small light gap when the blinds are closed — you’ll see tiny pinpricks of light down each cord line.
• Unrouted slats rest on cloth ladder tape instead of a drilled-through cord, so there’s no hole and no light gap. This is the room-darkening option, but cloth ladder tape is a specialty item (sold by blind-parts suppliers, not typical hardware stores) and it’s harder to source in small quantities than cord.

For a first build, routed slats with drilled cord holes are the more realistic starting point — the light-gap tradeoff is minor, and cord is easy to find, while ladder tape means ordering a specialty part before you can finish the project.

Staining and Finishing

Stain before drilling cord holes if you’re using an oil-based stain — it’s much easier to wipe excess stain off a flat slat than out of a narrow hole, and stain pooling inside a cord hole can gum up the cord later. Basswood and pine take an oil-based stain evenly since both are fairly uniform, close-grained woods; if you’re working with oak, expect the stain to pull differently along the more open grain, which some people like for the contrast and others find blotchy. Finish with two thin coats of wipe-on polyurethane rather than a heavy brushed coat — a thick finish on a thin slat is more likely to show brush marks and takes longer to cure fully.

Assembling on Purchased Hardware

Buy a headrail, tilter mechanism, cord lock, and bottom rail sized to your blind’s width — these are sold as blind hardware/repair components by specialty blind-parts suppliers, sized in the same widths as retail blinds. Thread your finished slats onto the ladder cords that come pre-installed in the headrail, following the manufacturer’s spacing guide for your slat width, then attach the bottom rail to the last slat and tie off the lift cord through the cord lock. This is the same hardware a small local blind shop uses when they build a custom-width blind for an odd-sized window — you’re doing the same job, just supplying your own slats instead of factory ones.

Installing the Blinds

1. Hold the mounting brackets in place at your marked bracket locations and check level before drilling — a bracket even 1/8 inch off level will show as a visibly crooked headrail once the blind is hanging.
2. Drill pilot holes and screw the brackets to the frame or wall.
3. Snap the headrail into the brackets until you hear or feel it lock.
4. Clip on the valance if your hardware kit includes one, then test the tilt and lift mechanisms through a full range of motion before calling the install done.

Maintenance

Dust with a soft cloth or a vacuum brush attachment; skip water and household cleaners, which can lift a wipe-on finish over time. Keep wood blinds out of direct, prolonged sun exposure on south-facing windows if you want the stain color to stay even — UV fading shows up as a visible color difference between the sun-facing edge of each slat and the shaded underside. If the tilt mechanism starts sticking, a few drops of dry silicone spray on the tilter gears (not a wet oil-based lubricant, which attracts dust) usually fixes it.

Troubleshooting Uneven Blinds

Problem	Likely Cause	Fix
Blind hangs crooked	A mounting bracket is out of level	Re-check with a spirit level and re-drill that bracket’s holes
Slats won’t tilt fully closed	Ladder cord spacing too tight for slat width	Loosen and re-space the ladder cord knots per your hardware kit’s spacing guide
Tilt wand feels stiff	Dust buildup inside the tilter gears	A few drops of dry silicone spray on the tilter, not a wet oil
Slats slide out of alignment	Lift cord knot at the bottom rail has slipped	Re-tie the cord knot and add a drop of cyanoacrylate glue to keep it from slipping again

Frequently Asked Questions

What is the best wood for blinds?

Basswood is the standard choice because it’s lightweight, easy to cut cleanly at slat thickness, and moves less across humidity swings than oak or cherry — that dimensional stability is what actually prevents binding and cracking at the cord holes over time, more than basswood’s looks or cost.

Can I really build the whole blind mechanism myself?

Not realistically. The tilt and cord-lock mechanism inside the headrail is a small geared assembly that isn’t practical to fabricate at home. The realistic DIY version is milling, finishing, and drilling your own slats, then mounting them on a purchased headrail/tilter/cord-lock hardware kit sized to your blind’s width.

Should slats be routed (drilled) or unrouted (ladder tape)?

Routed slats with a drilled cord hole are simpler to build and use easy-to-find cord, at the cost of small pinpoint light gaps down each cord line. Unrouted slats on cloth ladder tape block more light but require a specialty tape part that’s harder to source than cord, so most first-time builds use routed slats.

Can you cut faux wood blinds yourself?

Yes — faux wood blinds (PVC composite) can be trimmed to width with a fine-tooth saw, unlike real wood slats which you’d cut to width before assembly rather than trim after. See how to trim faux wood blinds for that process specifically.

Conclusion

The realistic version of this project splits cleanly in two: you mill, sand, and finish the slats, and a purchased hardware kit handles the tilt and lift mechanism. Get the slat width, spacing, and species tradeoffs right and the rest — measuring, assembly, and installation — is straightforward carpentry and hardware assembly.