Replacing a door knob and three hinges usually costs $75-$220 per interior door when standard hardware and routine labor are involved; a whole-home project may run $300-$1,200 or more. The cost to replace door knobs and hinges depends on hardware quality, door count, labor minimums, finish matching, and whether the existing holes and hinge recesses fit the new parts.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Knob and three hinges, materials | $25 | $65 | $180 | Basic to decorative or premium hardware |
| Labor per door | $40 | $85 | $160 | Routine removal and installation |
| One interior door, total | $75 | $150 | $340 | High end may include upgraded hardware or adjustment |
| Six-door project, total | $300 | $700 | $1,500 | Assumes shared visit and standard access |
What Does It Cost to Replace Door Knobs and Hinges?
For one standard interior door, budget about $75-$220 for a coordinated knob and three hinges, including ordinary installation. A common midrange job lands near $150: roughly $45-$75 for hardware and $75-$100 for labor, with some variation from minimum service charges. The low end assumes inexpensive passage hardware, a standard finish, and no carpentry or door adjustment.
For multiple doors completed in one visit, the effective cost often drops to $50-$130 per door because the installer can spread travel and setup time across the job. A six-door replacement commonly totals $300-$780 with basic or midrange materials. Privacy knobs for bedrooms and bathrooms may cost slightly more than passage knobs, while keyed entry sets and decorative finishes can raise the hardware budget substantially.
For a straightforward interior door, the most useful planning figure is around $100-$200 per opening installed. Exterior entry hardware, specialty hinges, old-house repairs, and one-door service calls can exceed that range. Assumptions: U.S. suburban labor rates, standard interior doors, three hinges per door, normal access, and no frame repair.
Door Knob, Hinge, and Labor Charges in One Quote
A quote can bundle all work into one per-door price or list hardware and labor separately. Comparing line items helps show whether a low estimate excludes disposal, finish upgrades, or adjustments. Typical ranges below reflect common residential work; branded, oversized, security-rated, or specialty-finish parts may exceed them.
| Quote item | Low | Average | High | What changes the price |
|---|---|---|---|---|
| Passage or privacy knob, each | $15 | $35 | $90 | Finish, style, brand, and lock function |
| Hinge, each | $3 | $8 | $25 | Size, bearing type, finish, and weight rating |
| Three hinges, per door | $9 | $24 | $75 | Standard versus ball-bearing or decorative |
| Installation labor, per door | $40 | $85 | $160 | Quantity, access, alignment, and service minimum |
| Door adjustment or minor prep | $0 | $35 | $120 | Loose frame, stripped screw holes, or rubbing |
Hardware prices are usually lower when purchased in multipacks, especially for several matching doors. Labor may be priced per opening or by time, commonly around $50-$100 per hour for a handyman and $75-$150 per hour for a locksmith or finish carpenter. A trip or minimum charge of $75-$150 can apply even when the physical work takes less than an hour.
Ask whether the labor price covers removing old parts, fitting the latch, tightening hinges, and testing the door. Painting, patching, new strike plates, and replacement of damaged jamb material are often separate.
How Door Count and Hardware Grade Change the Estimate
Door count is one of the strongest price levers. Replacing one knob and three hinges may take 45-90 minutes if parts fit cleanly, but the minimum visit charge can make a one-door job expensive per opening. At four to eight doors, the installer can work more efficiently, and some contractors reduce the labor rate to about $35-$75 per door when all work is done in one visit.
Hardware grade matters too. Basic knobs often cost $15-$35 each; midrange styles commonly cost $35-$70, and premium or designer models may reach $90-$200 or more. A standard residential hinge is often 3.5 inches high and costs $3-$12, while ball-bearing hinges for heavier doors can cost $10-$25 each. Across eight doors, upgrading knobs from $25 to $65 adds $320 before labor.
Door construction and preparation also affect the quote. A standard 2⅜-inch backset and common 2⅛-inch bore usually accept widely available knobs. Older doors with a different bore, unusual backset, mortise lock, or narrow stile may need specialty parts or modifications. Recessed hinge mortises that do not align with replacement hinges can add 30-90 minutes of fitting or chisel work per affected door.
Count the openings, confirm knob function, and measure before choosing a finish or style. A mismatch between the new latch and existing bore can turn a simple swap into a modification job. Assumptions: Standard 2⅛-inch knob bore, 2⅜-inch backset, and three 3.5-inch hinges on typical interior doors.
Ways to Lower the Price on a Multi-Door Replacement
Group the work into one appointment and have every door ready. Clear furniture, remove hanging items, and identify which doors need passage, privacy, or keyed hardware before the installer arrives. A prepared six-door project may avoid repeated setup and trip fees that make separate one-door calls costly.
Keep the existing hinge size, corner shape, and finish where they remain functional. Replacing only worn hinges or knobs rather than changing every piece can reduce material spending. If the goal is a consistent appearance, prioritize the most visible doors first and defer closets or utility doors that work properly.
Choose standard hardware from a widely stocked product line. Special-order finishes, unusually shaped rosettes, and premium lever or knob sets can raise both material cost and lead time. Before buying, compare the spindle, latch length, backset, door thickness, hinge dimensions, and screw-hole locations with the existing parts.
Request two or three itemized quotes for the same door count and hardware specification. Check whether quotes include materials, tax, removal, adjustments, and a service minimum. A lower labor bid may not be cheaper if it excludes fitting or charges separately for every door.
Three Home Quotes Show the Per-Door Difference
A one-door interior replacement is the costliest scenario per opening. For a standard bedroom door with a $30 privacy knob and $18 for three basic hinges, materials total about $48. At $90 labor plus a $35 visit charge, the estimate is approximately $173 before tax. If the homeowner supplies compatible hardware and no trip fee applies, the bill may be closer to $90-$140.
A six-door project with matching midrange knobs illustrates the benefit of batching. Six knobs at $45 each and 18 hinges at $7 each cost $396. Labor at $55 per door totals $330, making the project about $726 before tax or minor adjustments, or roughly $121 per opening. The work could take a two-person crew about 3-5 hours, depending on access and door condition.
A four-door project with premium keyed entry hardware on two exterior doors may cost more despite having fewer openings. Two entry sets at $120-$250 each, two interior knobs at $30-$60 each, and 12 hinges at $8-$18 each put materials around $396-$776. Labor and adjustments may add $250-$500, for a likely total of $650-$1,300.
These examples show why quotes should specify hardware function and door count, not just a per-door rate. Exterior doors may require compatible deadbolts, reinforced strike plates, or longer screws, while interior doors usually need simpler passage or privacy sets.
When Does a Locksmith or Handyperson Charge More?
A handyman is often the economical choice for routine interior knob and hinge swaps, especially when several doors are included. Typical hourly rates run around $50-$100, with flat per-door labor often used for simple jobs. A locksmith may charge $75-$150 per hour or a service minimum for keyed entry hardware, rekeying, lock compatibility, or security work. Rates vary by city and time of day.
Extra labor is more likely when a door sags, sticks, or will not latch after the new hardware is installed. Tightening screws may solve minor movement, but stripped jamb holes can require plugs, longer screws, or repair plates. A door that rubs because the frame is out of square may need hinge shimming or planing, which can add $35-$150 per opening depending on the repair.
Emergency or after-hours service can increase the visit charge by 25%-100%, and some providers charge a separate $50-$150 dispatch fee. A project involving only knobs and hinges rarely requires a licensed locksmith, but entry locks, rekeying, or security concerns may justify one. Confirm that the quote identifies the trade, travel charge, minimum labor, and any after-hours rate.
Use a routine appointment for ordinary hardware swaps and reserve locksmith pricing for lock or key work. A quote that includes hinge alignment and latch testing may be more valuable than the lowest labor-only number.
Can Existing Doors Take New Knobs and Hinges?
Most replacement knobs fit standard cylindrical lock preparations, but not every older door follows current dimensions. Check the door thickness, backset from the edge to the knob center, faceplate shape, and bore diameter. If the existing opening is nonstandard, a compatible replacement can cost $20-$100 more than a basic knob, while drilling or enlarging the door may add $40-$150 in labor.
Hinges need matching height, width, corner radius, and screw pattern. A hinge that is too large or has square corners when the mortise is rounded may not sit flush. Replacing hinges with a different size can require enlarging or filling the recess, and painting may be needed to conceal old outlines. A carpenter may charge $60-$120 per hour for detailed fitting or wood repair.
Door weight and use should guide hinge selection. A light hollow-core interior door usually works with standard hinges, while a heavy solid-core or frequently used door may benefit from ball-bearing hinges. Exterior doors exposed to weather may need corrosion-resistant material. Upgrading every hinge to a higher load rating is not always necessary if the door is light and the existing hinge type is sound.
Taking clear measurements and photos before buying helps prevent return trips and unusable hardware. When dimensions are uncertain, the old knob and one hinge can be removed for a hardware-store match, or the installer can supply compatible parts.
Regional Labor Rates Shift the Installed Price
Labor costs are typically higher in major coastal cities and dense metro areas than in smaller inland markets. For the same standard six-door job, a high-cost urban location may run about 15%-35% above a national midrange estimate, while a rural market may be 5%-20% below it. These percentages are broad planning ranges, not guaranteed local rates; travel distance and contractor availability can reverse the comparison.
In a lower-cost market, basic installation labor might be $35-$70 per door for a multi-door visit. In higher-cost metro areas, it may reach $70-$140 per door, especially when the contractor has a minimum charge or parking and access constraints. Hardware prices tend to vary less than labor, although local stock, shipping, and sales tax affect the total.
Urban apartments may involve elevator scheduling, building access, or restrictions on work hours. These conditions can add setup time even when the actual door work is simple. Rural properties may face a travel fee if the service provider is far away; a $25-$100 trip charge can outweigh lower hourly rates on a single-door job.
Compare local quotes using the same hardware list, number of doors, and included tasks. An installed total is more useful than comparing hourly rates alone, particularly when one provider includes travel and another lists it separately.
What Can Add Removal and Repair Charges?
Removing ordinary knobs and hinges is generally part of installation labor, but damaged or seized fasteners can add time. Rusted screws, painted-over hinge pins, or stripped heads may add $15-$60 per door when removal requires careful drilling or extraction. Old paint around hinge leaves can also make a new hinge sit unevenly unless the surface is cleaned or lightly fitted.
Disposal is usually minor because old hardware is small, and many installers include it in the service. A separate disposal fee of $10-$40 is possible for a larger project or when other renovation debris is involved. Replacement strike plates, latch plates, longer screws, and wood filler may add $5-$30 per door in parts, with installation included or charged separately.
Painting and refinishing are usually outside a knob-and-hinge quote. Touch-up painting may cost $50-$150 for a small visit, while repainting several doors can be priced by the door or by the room. If new hardware changes the visible footprint, patching and paint can cost more than the hardware itself, especially on stained wood where color matching is difficult.
Ask the installer to flag likely repairs before work begins and get approval for added charges. A written estimate should distinguish a simple hardware swap from jamb repair, repainting, or door replacement.