Labor to install an interior door slab typically costs $100-$300 per door, with an average near $180 for a standard, ready-to-fit slab. The final price depends on hinge and latch alignment, trimming, door size, existing-frame condition, and local labor rates; materials are usually extra.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Labor per standard slab | $100 | $180 | $300 | Hang and fit in a sound existing frame |
| Labor per difficult slab | $250 | $375 | $550 | May need substantial trimming or frame adjustments |
| Labor rate | $50/hour | $85/hour | $125/hour | Varies by market and contractor |
| Labor for three standard doors | $270 | $480 | $750 | Multi-door pricing may reduce the per-door rate |
Typical labor price for a standard interior slab
A carpenter or door installer commonly charges $100-$300 in labor to fit one standard interior slab into an existing, usable jamb. A straightforward job often takes 1-2 hours and includes sizing, hinge placement, hanging, and checking the swing. A typical midpoint is about $180 per door.
This estimate is for labor only. It assumes a common 30- to 32-inch-wide, 80-inch-tall hollow-core or solid-core slab, no frame replacement, and ordinary access. Assumptions: U.S. national pricing, standard materials supplied separately, normal access, existing jamb in serviceable condition.
Labor may be quoted hourly or as a flat project charge. At $75-$110 per hour, a two-hour installation works out to $150-$220 before any trip charge or extra work.
What hinge, latch, and fitting work adds to the quote
Slab installation takes more measuring and layout than replacing a prehung door because the new door does not come with hinge mortises or a prepared lock bore. The quote should identify whether it includes transferring hardware locations, cutting hinge recesses, boring the latch hole, adjusting the door, and testing the finished fit.
| Labor task | Typical charge | When it applies | Possible effect |
|---|---|---|---|
| Hang and basic fit | $100-$220 per door | Matching slab and sound jamb | Standard labor scope |
| Hinge mortising and alignment | $35-$100 per door | Hinge locations do not match | Extra layout and chiseling |
| Latch and knob bore | $25-$75 per door | Slab is not pre-bored | Depends on hardware position |
| Planing or edge trimming | $30-$100 per door | Slab needs sizing for the opening | More for extensive fitting |
| Jamb or strike adjustment | $50-$200 | Frame is out of square or hardware misses | May require a separate repair |
Ask for an itemized scope before comparing bids. Some installers include hinge work and a latch bore in one flat rate, while others charge for each operation.
Door width, thickness, and jamb condition change labor
Size and condition can move the quote well beyond the standard range. A common 1⅜-inch-thick interior slab is usually simpler to fit than an unusual thickness or a custom-width door. A 24- to 36-inch slab may fit a typical opening, but a difference of even ⅛-¼ inch at the edge can require careful planing and refinishing.
Frame condition is often the largest labor wildcard. If the jamb is twisted, loose, or badly out of square, the installer may need to reset hinges, adjust the strike, or repair the frame. That can add $50-$200 or more; significant jamb replacement is separate work and may make a prehung unit more practical.
Solid-core doors are heavier than hollow-core slabs and may take two people to position safely, particularly at widths above 32 inches. A second installer, heavy-door handling, or difficult stairs can add roughly $40-$150. Painting, staining, and hardware costs are generally not included in a labor-only hanging quote.
How one door compares with a three-door installation
Small jobs can have a minimum charge because setup and travel take time even when the work itself is brief. A single slab may cost $150-$300 in labor, while three similar slabs in the same home may total $300-$750, or about $100-$250 each. The per-door savings are most likely when the openings are accessible and all slabs need similar work.
Bundle only doors with comparable scope. A simple bedroom slab and a door needing extensive trimming should not be assumed to have the same per-unit price. Confirm whether the contractor has included hardware installation, disposal of an old door, and any return visit.
How long a slab takes to hang and what delays it
A prepared, matching slab can take about 1-2 hours of hands-on labor. A blank slab needing hinge mortises, a knob bore, and several fitting adjustments may take 2-4 hours. Painting or staining can add work time and drying intervals, though finish work may be priced separately.
Unusual openings can turn a short visit into a half-day job. Old houses may have settled jambs, layered paint, or nonstandard hinge spacing. Ask whether the estimate covers adjustments up to a stated amount of labor and how extra time is billed.
When slab replacement costs less than a prehung door
Keeping a sound jamb and replacing only the slab can avoid removing trim, repairing drywall, and resetting the frame. That makes a slab a cost-conscious choice when the opening is square and the replacement matches the old door’s dimensions and hinge layout.
A prehung replacement can be a better value when the jamb is damaged or badly misaligned. Although hanging a prehung unit often involves more removal and installation labor, it arrives with the door fitted to its frame. Compare complete labor scopes rather than comparing the slab’s lower purchase price alone.
Ways to lower the interior slab installation bill
Measure the existing slab’s height, width, thickness, hinge positions, and knob height before buying a replacement. Matching those measurements can reduce mortising and trimming charges. Share clear photos of the jamb and hardware with contractors so estimates account for the real condition instead of relying on a basic hanging rate.
Keep a sound frame and avoid paying for unnecessary finish work. Group several doors into one appointment, clear the work area, and confirm whether the slab will arrive pre-bored or prefinished. Get at least two itemized quotes that separate hanging labor, modifications, hardware, disposal, and any minimum service charge.