A carpenter comparing a new door slab against the old door to transfer hinge positions before hanging it in an existing frame
The old door is the template. Hinge spacing, latch height, and the panel outline all transfer from it to the new slab.

How To Replace An Interior Door Slab Only: Keep The Frame

That hollow-core door has had a good run, but the surface is dinged and the panel style dates the room. You want a new one, and you would rather not tear into the wall, the trim, or the paint line around the opening to get it.

Replacing an interior door without replacing the frame is a real option, and it is the cheaper one. It only works when the frame behind it is still worth keeping.

The decision comes down to one inspection and one measurement. If the jamb is straight, solid, and square enough, a new slab will fit it and you will save most of the labour.

If it is rotten, twisted, or badly out of square, a slab will fight you for as long as you own the house. This guide walks through how to tell the difference, then how to fit the new door to the frame you already have.

Why the Frame, Not the Door, Decides This Job

A carpenter comparing a new <strong>door slab</strong> against the old door to transfer hinge positions before hanging it in an <strong>existing frame</strong>” width=”1280″ height=”720″ /><figcaption>The old door is the template. Hinge spacing, latch height, and the panel outline all transfer from it to the new slab.</figcaption></figure> <p>A door slab is only the panel. It arrives with no frame, no hinges, and usually no holes cut for the hardware. That is the whole point of buying one: you already have a frame, so you leave it alone.</p> <p>The catch is that a slab has no margin for error. A prehung unit arrives with its own frame already squared, so a small mistake gets absorbed somewhere in the assembly. A slab has to land inside an opening that was framed months or years earlier, and it has to land true on the first try.</p> <p>This is why the frame condition matters more than the door. You are not really choosing a door. You are choosing whether your existing opening can accept a new panel, and that is a question about wood, not about style.</p> <p>Keeping the frame also keeps the casing, the trim, and the paint line intact around the opening. That is where most of the mess and most of the cost in a door job actually lives.</p> <h3>What keeping the frame actually means</h3> <p>It means the jamb stays fastened to the wall. The casing and door stop usually stay too. You remove the old panel, fit the new one, and adjust it until it swings and latches cleanly.</p> <p>It does not mean the job is automatic. <strong>The new slab</strong> has to match an opening that may no longer be perfectly square, and the hardware positions on the old door have to move across exactly.</p> <h2>Inspect the Frame Before You Buy Anything</h2> <p>Most replacement guides skip this step and go straight to the slab. That is the gap that decides the whole job, because ranked pages rarely say what a bad frame actually looks like.</p> <p>Start with the diagonals, since they tell you more than any other single check. Measure from the top corner of the opening to the opposite bottom corner, then do the other pair. Write both numbers down.</p> <p>If the two <strong>diagonal measurements</strong> differ by no more than <strong>1/8 inch</strong>, the opening is close enough to square for a slab swap. Frame tolerance guidance for door openings holds to roughly that figure, and a slab can be fitted to an opening that sits inside it.</p> <p>More than 1/8 inch of difference and you are looking at a frame that has racked. A new slab fitted to that opening will show a <strong>wedge-shaped gap</strong> down one side, and no amount of planing will hide it.</p> <h3>The three signs that mean replace the frame</h3> <p><strong>Rot is the decisive one</strong>. Press the jamb near the hinge locations and the bottom corners with a screwdriver. Soft wood, or wood that crumbles, means the frame has to come out.</p> <p><strong>Warping and twisting</strong> come next. Sight down the face of the jamb. If it bows or twists, the new door will bind against it no matter how carefully you fit the panel.</p> <p>Finally, check whether the frame still <strong>holds its fasteners</strong>. Pull gently on the hinge side. If the jamb moves in the wall, the screws are no longer gripping framing, and a new door will only loosen them further.</p> <p><strong>Localized damage</strong> is a different story. A small split, a minor ding, or a patch of superficial rot near the stop can often be repaired, and a slab swap still makes sense. The test is whether the frame is still straight, solid, and secure as a whole.</p> <h2>When Keeping the Frame Is the Right Call</h2> <p>You are a good candidate for a slab-only swap when the frame passes the checks above and your reason for changing the door is cosmetic. Swapping old <strong>six-panel hollow-core doors</strong> for cleaner <strong>shaker-style panels</strong> is the classic case.</p> <p>It also makes sense when you want to keep the surrounding trim. If the casing and baseboards are in good shape and you would rather leave them undisturbed, a slab lets you do exactly that.</p> <p>The economics are straightforward. A hollow-core slab swap that reuses the existing frame and hinges runs roughly <strong>$100 to $250 in labour</strong>, with the door itself typically <strong>$75 to $200</strong>. Installed pricing guides put a hollow-core slab swap at roughly $200 to $450 for the whole job.</p> <p>Compare that with the cost of the frame work it avoids. <strong>Replacing jambs only</strong> runs about $75 to $200 in materials plus $150 to $300 in labour. Hiring a pro to repair a damaged jamb runs around $240, and frame damage or rotted jambs run <strong>$600 and up</strong>.</p> <p>There is one upgrade that complicates the picture. Moving from a hollow-core door to a heavier solid-core door in the same opening adds fitting work, because the new panel is stiffer and less forgiving when you trim it.</p> <h2>Measure the Opening, Then the Old Door</h2> <p>Measure the opening diagonally first, and record the result alongside the width and height. Standard US interior slab widths are <strong>24, 28, 30, 32, and 36 inches</strong>, with a standard height of 80 inches and thicknesses of either 1-3/8 or 1-3/4 inch.</p> <p>Then measure the old door itself, because that is your template. Take the height on both the hinge side and the latch side, and the width at the top, middle, and bottom. Those three width readings will tell you whether the opening has racked since the door was hung.</p> <p>The hardware positions matter as much as the panel dimensions. Measure from the top of the door to the center of each hinge pin, and record the spacing between them.</p> <p>Do the same for the latch. The <strong>lock borehole</strong> is normally 2-1/8 inches in diameter, and the backset, the distance from the door edge to the center of the bore, is usually <strong>2-3/8 inches</strong>. Those two numbers decide what hardware will fit.</p> <p>Carry the old door with you when you buy the replacement. Laying it on top of the new slab and marking the hinge and latch positions directly is faster and more accurate than working from a list of measurements.</p> <h2>Fit the New Slab to the Frame You Kept</h2> <p>Begin with the trim. If the new slab is slightly too large, reduce it to match the old door. Keep about a 1/8 inch reveal around the top and side edges, and put a slight bevel on the latch-side edge so the door closes without binding.</p> <p>Next come the mortises, the shallow recesses that let the hinge leaves sit flush with the edge of the door. Mark the vertical positions from the old door, then cut to the depth of the hinge leaf.</p> <p>A router with a hinge-mortising jig gives the most consistent result. A sharp chisel with a utility knife works well if you do not own one, and the depth is the same either way.</p> <p>Then bore the lockset holes. The center of the knob typically sits about 36 inches from the finished floor. Use a <strong>lock installation jig</strong> if you have one, because a misaligned bore will make the latch bind.</p> <p>Hang the door by aligning the hinge leaves on the door with the leaves still on the jamb, then slide the pins in. Support the weight with a pry bar or shims while you do this, so the knuckles line up without strain.</p> <p>Check the reveal immediately. It should sit at roughly <strong>1/8 to 3/16 inch</strong> all the way around. If the door sticks on the latch side, a light pass with a plane or sandpaper opens the gap.</p> <p>If the hinge side is too wide, a thin shim behind the hinge leaf on the jamb side pulls the door toward the latch. Finish by confirming the latch bolt meets the strike plate cleanly.</p> <p>If the door sags or the latch will not engage, replace one of the shorter screws in the top hinge with a longer one that reaches the framing behind the jamb.</p> <h2>Before You Buy a Slab, Check the Hinges</h2> <p>Not every door that will not close needs a new panel. A <strong>stripped hinge screw</strong> can be the entire problem, and it costs about $6 to fix. Snug the hinge screws by hand, top hinge first, before you spend money on anything else.</p> <p>The same goes for a latch that will not catch. Read the bolt against the strike plate before you assume the door itself is at fault, because the plate usually needs a small shift rather than a new door.</p> <p>If the door has dropped at the latch side, <strong>the top hinge</strong> has usually pulled away from the framing. That is a fastening problem, not a door problem, and it is worth fixing first.</p> <p>When the frame is sound but the door is dinged, warped, or simply the wrong style, you have <strong>a clean slab swap</strong> on your hands. That is the job this guide has been describing, and it is one most homeowners can do in an afternoon.</p> <p>Your next step depends on what the inspection found. If the frame passed, buy a slab one size down from your opening measurement and go straight to the fitting sequence in <a href=how to install an interior door slab.

If the frame failed on rot or twisting, how to install a door frame covers the reframing work. Either way, interior door installation cost lays out what a fair quote should contain before you call anyone.

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