How to Build Custom Picture Frames: Molding, Miters, and Finishing

Making your own picture frames is one of the most satisfying workshop projects you can do. The cost savings are real — a custom frame from a frame shop can cost $50 to $300 or more, while building it yourself from solid wood might cost $5 to $20 in materials. But the better reason to build your own frames is the ability to match any size, any profile, and any finish to exactly what the art or photo needs.

Frame making sits at the intersection of precision woodworking and creative finishing. The joinery has to be tight, the angles have to be exactly right, and the finishing can range from a painted gesso surface to a hand-rubbed oil finish to genuine gold leaf. This guide walks you through every step of the process, from designing the rabbet to hanging the finished piece on the wall.

Why Make Your Own Frames?

Beyond cost, custom frame-making gives you options that frame shops either cannot offer or charge a premium for:

Exact sizes: Frames for non-standard artwork, vintage prints, or odd-sized photos
Custom profiles: You choose the molding shape — simple and modern, ornate and classical, or anything in between
Material and finish control: Stained walnut, painted poplar, gilded gesso, distressed pine — whatever the art calls for
Multiples: Once you have a profile set up on your router table, making six frames takes only slightly longer than making one

Understanding Rabbet and Profile

Every picture frame has two essential elements: the rabbet and the profile.

The Rabbet

The rabbet is the stepped recess on the back inside edge of the frame that holds the glass, mat, artwork, and backing in place. Getting the rabbet depth right is critical — it needs to be deep enough to hold all the layers without the backing protruding past the back of the frame.

A typical stack might be:

Glass: 2mm to 3mm (standard single-strength glass)
Mat board: 4mm to 5mm (depending on thickness)
Art/photo: 1mm to 2mm
Backing board: 3mm to 5mm
Total depth needed: approximately 10mm to 15mm

Cut your rabbet to at least 1/2” (12mm) depth to accommodate this stack with a little room for mounting hardware. The width of the rabbet is typically 3/8” to 1/2”.

Molding Profiles

The profile is the decorative face of the frame. Common options include:

Flat: Clean and modern — just a flat face with chamfered or eased edges. Easiest to produce.
Cove: A concave curve routed into the face. Elegant and traditional.
Ogee: An S-shaped curve — more ornate, used in traditional and gilded frames.
Compound: Multiple routed profiles combined — the most complex and decorative.
Stepped: Multiple flat levels creating a layered shadow effect. Modern and graphic.

For your first frames, start with a flat or single-cove profile. As your router table skills develop, move into compound profiles.

Choosing Your Wood

The wood choice is driven by the intended finish.

Poplar is the best choice for painted frames. It is close-grained, machines cleanly, takes primer and paint beautifully, and is significantly more affordable than hardwoods. It is what most commercial frame shops use for their paint-grade work.

Walnut is the premium stain-grade option. The dark, rich grain of walnut makes even a simple flat profile look sophisticated. It routes cleanly, holds detail well, and takes an oil or poly finish beautifully.

Pine is the budget option — knotty pine for a rustic look, clear pine for more refined work. Pine dents easily and its open grain requires more finishing steps, but it is widely available and inexpensive.

Hardwood plywood (maple, birch, walnut veneer) works for flat-profile frames and is very stable — less prone to warping than solid wood in thin sections.

Oak is beautiful but can be challenging to route cleanly because of its open grain — pores can tear out on profile cuts. Use sharp bits and take light passes.

Start with stock that is at least 3/4” thick. Most frame profiles are milled from 3/4” to 1-1/4” thick material.

Tools Required

Essential

Miter saw: Your miter saw must be accurately set to exactly 45 degrees. Even 0.5 degrees of error creates visible gaps at the corners. Use a digital angle gauge to verify the saw setting before cutting frame stock. A sliding compound miter saw handles wider profile stock without difficulty.
Router table: Used for cutting the rabbet and milling the decorative profile. A router table gives you far more control and precision than a handheld router for this work.
Router bits: A rabbet bit (or straight bit) for the rabbet; profile bits (cove, ogee, roundover, chamfer) for the face profile.
Band clamps (frame clamps): Wrap around all four corners simultaneously and apply equal clamping pressure. Essential for frame assembly.
Combination square and digital calipers: For precise measurement and setup.

Helpful

Router table fence with featherboards: Keeps stock consistent and your hands safe.
Corner clamps: Useful for gluing and checking corners individually.
Shooting board and hand plane: For fine-tuning miter angles by hand.
Nail gun (18-gauge brad nailer): For pinning corners while glue sets.

Step 1: Design the Profile and Rabbet

Before cutting anything, sketch your frame cross-section. Decide:

Overall width: The visible face of the frame from outside edge to inside edge. Common widths: 1” to 3” for most frames, up to 4” or more for large gallery frames.
Rabbet position and depth: The rabbet is always on the back, inside edge.
Profile location: The decorative routing happens on the face — the side that is visible when the frame is hanging.
Material thickness: Make sure your starting stock is thick enough to accommodate the rabbet depth while leaving enough material for the face profile.

For a simple beginner frame: start with 3/4” thick x 2” wide stock. Cut a 1/2” wide x 1/2” deep rabbet on the back inside edge. Round over or chamfer the face edges.

Step 2: Mill the Rabbet

Set up your router table with a straight bit or dedicated rabbet bit. Set the fence position and bit height to achieve your planned rabbet dimensions.

Run test cuts on scrap wood first. Verify the rabbet dimensions with calipers. Adjust until the rabbet is exactly right, then mill all your frame stock in one setup.

Safety notes for the router table:

Always feed stock against the rotation of the bit (right to left on most setups)
Use featherboards to keep stock against the fence
Take shallow passes for deep rabbets — do not try to remove more than 1/4” per pass in hardwood

Step 3: Mill the Profile

Without changing your router table setup too dramatically, switch to your profile bit and mill the decorative face profile. Again, test on scrap first.

For a cove profile: a cove bit on the face, run along the outer or inner edge of the frame face. Keep passes light — 1/8” to 1/4” depth per pass.

For compound profiles, you may need multiple router table setups and multiple bits. Work methodically: mill the deepest cut first, then successive profiles.

Step 4: Calculate Cut Lengths

This is where many frame makers make their first mistake. Frame miter math needs to be precise.

The key concept: for a 45-degree miter, the outside (long) dimension of each piece equals the corresponding outside dimension of the opening plus twice the face width of the molding. The inside (short) dimension equals the opening dimension.

For example: to frame a 16” x 20” print with a 2” wide molding:

The two short pieces: outside dimension = 16” + (2” x 2”) = 20”, inside dimension = 16”
The two long pieces: outside dimension = 20” + (2” x 2”) = 24”, inside dimension = 20”

Account for the kerf of the saw blade (typically 1/8”). Cut pairs of pieces at the same saw setting without moving the fence — this ensures each pair is identical.

Always cut long and sneak up on final length. A piece that is 1/16” too long can be trimmed; a piece that is 1/16” too short means starting over.

Step 5: Cut the Miters

Set your miter saw to exactly 45 degrees. Verify with a digital angle gauge. Make a test frame from scrap at the final dimensions — four pieces, all mitered, taped together in a loop. The corners should be perfectly tight with no gaps and the frame should be perfectly square (measure diagonally — equal diagonals = square frame).

When cutting your actual frame pieces:

Cut one end of each piece first
Flip and cut the second miter, measuring from the short point (inside dimension)
Cut pairs together where possible for consistent length

Number each piece and mark which end is which. Do not mix up pairs.

Step 6: Corner Joinery

The miter joint alone has minimal glue surface area and is weak. You need a secondary fastening method.

Option 1: Spline Joinery

A spline is a thin strip of wood or plywood that fits into a slot cut across the miter joint. The slot is typically cut on the router table with a slotting bit, or on the table saw with a jig that holds the frame corner at 45 degrees to the blade.

Splines dramatically increase glue surface area and add mechanical strength. They are virtually invisible from the front and only slightly visible from the back. This is the most professional approach.

Option 2: V-Nails (Underpinner)

Professional frame shops use an underpinner machine that drives V-shaped staples up through the back of the corner, pulling the joint tight. You can use hand-driven V-nails with a setter tool for a similar result. This is fast and effective but requires the specific tool.

Option 3: Corner Brackets

Metal corner brackets or offset clips are screwed into the back of the frame to hold the corners together. Simple and accessible, but not as clean-looking from the back as splines or V-nails.

Option 4: Brad Nails

For lightweight frames, glue and pin with 18-gauge brads through the corner is sufficient. It is the simplest approach but provides the least mechanical strength.

Step 7: Assembly

Apply wood glue to both faces of each miter joint. A thin, even coat — do not use so much that it squeezes out everywhere and has to be cleaned up.

Use a band clamp to wrap all four corners simultaneously. Tighten evenly, checking that the frame is flat and square as you go. If the frame is racking (twisting), lay it on a flat surface and apply light pressure until it flattens, then let the clamp hold it there.

If using splines: insert splines with glue into the slots before clamping. Trim spline excess after the glue dries with a flush-cut saw or chisel.

Let glue cure for at least one hour before removing clamps; overnight is better.

Step 8: Fitting Glass, Mat, and Backing

Cut your glass to the inside opening dimensions (slightly undersized — 1/16” smaller than the opening on each dimension). Have glass cut at a hardware store or frame shop if you do not have a glass cutter. For most work, non-glare glass is worth the small premium.

Cut a mat from mat board to fit: the outside matches the frame opening, the inside window is cut to display the art. A mat cutter (Logan or Bevel mat cutter) makes 45-degree bevel cuts in the mat window for a professional look.

Layer the stack into the rabbet: glass first, then mat, then art face-down, then backing board. Secure the backing with offset clips (small bent metal tabs that are screwed into the frame side and bent over the backing to hold everything in place) or with glazier’s points tapped in with a putty knife.

Finishing Options

Paint

Painted frames suit modern, Scandinavian, and gallery aesthetics. Spray painting gives the smoothest result on intricate profiles — a rattle can or spray gun applies finish into recesses that a brush cannot reach cleanly.

Apply shellac or oil-based primer first (especially on poplar, which can raise grain), sand lightly with 220-grit, then apply two coats of finish paint. Flat black, warm white, and deep navy are all popular frame colors.

Stain and Polyurethane

For walnut and other hardwoods, a simple wipe-on oil finish or hand-rubbed poly showcases the grain beautifully. Apply stain if desired (walnut typically does not need it — the natural color is stunning), then two to three coats of wiping varnish or oil-based polyurethane. Rub out the final coat with 0000 steel wool for a smooth, satin feel.

Gilding

Gold leafing transforms a simple profile into something that looks like it came from a museum. Apply gesso (a chalk and glue compound) to the frame surface, building up multiple coats and sanding between each. Apply gold size (adhesive) and then lay sheets of gold leaf or metal leaf over the tacky surface. Burnish with a soft brush. A coat of shellac protects the finish.

Full gilding is an art form of its own, but a partial gilt approach — gold accents on molding ridges over a painted field — is very achievable for a patient woodworker.

Hanging Hardware

Use D-ring hangers or strap hangers screwed into the back of the frame on the two side pieces. Install them approximately one-third of the frame height from the top. String braided picture wire between the two hangers, twisted tightly to prevent slippage. The wire should be taut enough that it does not show above the top of the frame when hanging.

For heavier frames, use two-piece security hangers that lock onto wall hooks — these prevent the frame from tilting or being accidentally knocked off the wall.

A Great Set of Corner Clamps Transforms Frame Assembly

If you plan to build more than a few frames, investing in a dedicated corner clamp set will make assembly faster and more accurate. Corner clamps hold each joint at exactly 90 degrees while the glue cures, eliminating the need to fight a band clamp trying to maintain squareness. A good set includes four matching clamps — one per corner — and can be used for frames, boxes, and cabinet face frames as well. Look for cast iron or aluminum construction with smooth-threading mechanisms and non-marring pads.

Final Thoughts

Frame making rewards precision and patience. The miter cuts need to be exact, the rabbet needs to be consistent, and the joinery needs to be tight before any finishing can hide imperfections. Start with a simple flat profile in poplar, painted black — it is the most forgiving combination and will teach you every step of the process. Once you have built your first successful frame, the door opens to walnut with Danish oil, gilded ogee profiles, built-up compound moldings, and frames that outshine anything available at retail for a fraction of the cost.