Master key locks typically cost $300-$900 for a small commercial setup covering 5-10 doors, while larger or high-security systems can exceed $2,500. The final price depends on door and cylinder counts, whether existing locks can be rekeyed, hardware grade, key hierarchy, and locksmith labor.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Small master key system | $150 | $500 | $900 | Usually 3-10 compatible cylinders; rekeying existing hardware |
| Cost per rekeyed cylinder | $15 | $25 | $45 | Price may exclude a service-call minimum |
| New commercial lock installed | $100 | $175 | $350 | Per door; higher for commercial-grade or restricted-key hardware |
| Larger 20-door system | $800 | $1,800 | $3,500+ | Depends on replacement hardware, hierarchy, and site conditions |
What a 5- to 10-door master key system costs
For 5-10 doors with working, compatible locks, a basic master key setup commonly totals $300-$900. This assumes a locksmith rekeys the existing cylinders, supplies new keys, and sets up one master key level, with no major repairs or hardware replacement. A very small setup of 2-4 doors may come in around $150-$450, although a service-call minimum can make the per-door price higher.
For a standard small business, budget about $50-$120 per door when several cylinders are serviced together. That estimate can include cylinder rekeying, a share of the setup charge, and ordinary keys; it does not necessarily include new locksets, premium restricted keys, or electronic access hardware. A quote should state the number of cylinders and keys, the number of master-key levels, and whether the price includes travel.
For 10-20 doors, expect roughly $700-$2,500 if most existing locksets can be retained. Replacing several locks or building a more complex hierarchy can lift the project to $3,500 or more. High-security cylinders and systems with multiple departments, managers, and access levels require more precise keying and documentation than a simple single-master arrangement.
Assumptions: Typical U.S. metro-area locksmith rates, standard commercial cylinders, normal access, and no emergency callout.
How cylinder rekeying and hardware shape the locksmith quote
A master-keying quote usually combines cylinder work, key cutting, system setup, and labor. The table shows common planning ranges; actual charges vary with lock brand, cylinder condition, location, and whether the locksmith can service the locks at the property.
| Quote component | Typical price | Unit or scope | What changes it |
|---|---|---|---|
| Rekey existing cylinder | $15-$45 | Per cylinder | Lock type, condition, and quantity |
| Master-key system setup | $75-$250 | Per small system | Key hierarchy and key schedule |
| New commercial lockset | $60-$200 | Hardware per door | Grade, function, and finish |
| Installation labor | $40-$100 | Per lock in a multi-door job | Door preparation and access |
| Keys and duplication | $3-$15 | Per standard key | Key blank and restriction level |
| Service call or trip | $50-$150 | Per visit | Distance, minimum charge, and timing |
Some locksmiths quote one project price rather than separate line items. Others charge a setup fee plus a per-cylinder rate. An additional master-key level may add about $50-$200 for planning and keying on a small system, with extra key copies billed separately. Restricted keyways, which limit who can order duplicates, can add $10-$40 or more per key and may involve authorization procedures.
Ask for one written total that distinguishes rekeying from lock replacement. The estimate should identify each door or cylinder, the lock model where known, keys included, any trip charge, and the price for added keys. A low quote may cover only basic rekeying and exclude damaged hardware or replacement cylinders.
How door count, key levels, and cylinder type change the price
Door count matters, but the number of separate cylinders is more useful for estimating than the number of doors alone. A double-cylinder door may have two keyed cylinders, while a door with a compatible interchangeable core can be faster to service. Adding doors often lowers the average trip cost per cylinder, but it does not always reduce the cost of planning a complex key system.
Key hierarchy is another major variable. A basic setup may have one master key that opens all included locks and individual change keys for each door. Adding two or three intermediate levels for departments or floors increases the number of key combinations and the work needed to prevent unwanted access. For a small system, added hierarchy may raise the system portion by roughly $50-$200; larger systems can require a custom quote.
Hardware compatibility can decide whether rekeying stays near $15-$45 per cylinder or replacement becomes necessary. If a lock has a damaged cylinder, obsolete keyway, or nonstandard format, a replacement cylinder may cost $30-$100 before labor. A full commercial lockset replacement can reach $100-$350 installed per door. High-security or restricted-key cylinders may cost $80-$250 or more each before installation.
Capacity also affects planning. A system with 5-10 cylinders is relatively straightforward; systems with 25 or more cylinders, several buildings, or multiple independent master groups call for a key schedule and careful records. If the system must support future expansion, the locksmith may need to reserve combinations, which can affect the hardware selected and the initial setup cost.
Rekeying existing locks versus replacing commercial locksets
Rekeying is usually the less expensive option when the current locks are in good condition and use compatible cylinders. It changes which keys operate the locks without replacing the complete lockset. A bundle of 8 cylinders might cost around $200-$450 to rekey and master-key, excluding unusual hardware or a high service minimum.
Replacement makes more sense when locks are worn, damaged, inconsistent, or incompatible with the intended keyway. For 8 commercial doors, new standard locksets with installation can run roughly $800-$2,800, before any premium system fees. Replacing only the cylinders may lower that total if the existing lock bodies are suitable. Ask the locksmith to price both approaches when hardware condition is uncertain.
Do not pay for full lock replacement solely to change who has keys. Rekeying can address lost or unreturned keys at a fraction of replacement cost, provided the cylinders are serviceable. Replacement may be justified for security upgrades, failed hardware, code requirements, or a need to standardize different lock brands.
Electronic locks are a separate comparison. A keypad or networked access system can cost about $150-$600 per door installed for basic standalone equipment, and more for connected commercial platforms. It may reduce key handling but brings battery, software, wiring, and ongoing support considerations. A conventional master-key system generally has the lower upfront price.
How many locksmith hours and service fees to expect
A locksmith may complete a simple 5-10-cylinder rekeying job in about 2-4 hours on site, including setup and key testing. A 20-door project can take 5-10 hours, especially if the technician must remove locksets, troubleshoot mismatched cylinders, or install new hardware. Larger properties may need multiple technicians or separate visits.
Typical locksmith labor rates are about $75-$150 per hour, though some businesses quote per cylinder or per door instead. A dispatch or service-call fee of $50-$150 may apply, and remote locations can add mileage or travel time. After-hours, weekend, or emergency work can add 25%-100% to labor or trigger a higher minimum charge.
Scheduling a planned daytime visit and grouping all doors into one appointment can limit trip and labor charges. Before booking, confirm whether the quoted rate includes inspection, key cutting, testing, and cleanup. If the job may require replacement parts, request approval before the locksmith proceeds beyond the agreed estimate.
How regional labor rates shift master-key pricing
Prices tend to be highest in dense, high-cost metro areas and lower in many rural markets, but travel can erase some of the difference. As a rough budgeting adjustment, major coastal cities may run 15%-35% above national midrange pricing. Smaller cities and rural areas may be 5%-20% below it when a locksmith is nearby and the job is scheduled during normal hours.
For example, a 10-door rekeying project estimated at $600 in a mid-cost market could run about $700-$810 in a high-cost city, or around $480-$570 in a lower-cost area. Those figures are directional, not fixed regional tariffs; commercial labor availability, lock brand, parking, access restrictions, and local taxes can change the quote.
Compare local quotes using the same cylinder count and key hierarchy rather than comparing headline totals alone. Ask whether each estimate includes the visit, all requested keys, and any parts. A quote that is $100 lower but excludes several keys or replacement cylinders may not be the less expensive option.
Three sample quotes for common master-key jobs
These examples show how scope changes the total. They assume ordinary weekday work, standard hardware, and no code upgrades. A local locksmith can adjust the estimate after checking the cylinders and confirming how many keys and access levels are required.
| Scenario | Scope | Estimated total | Approximate rate |
|---|---|---|---|
| Small office | 6 cylinders rekeyed, 1 master level, 10 standard keys, 2.5 labor hours | $350-$650 | $58-$108 per door |
| Retail suite | 12 cylinders, 2 key levels, 18 keys, 4-6 labor hours | $700-$1,350 | $58-$113 per door |
| Older 20-door property | 12 cylinders rekeyed, 8 locksets replaced, 3 key levels, 8-12 labor hours | $1,700-$3,500 | $85-$175 per door |
In the small-office example, the price includes a system setup allowance and a trip charge shared across six doors. The retail estimate allows for more keying combinations and additional keys. The older-property example costs more because some locks are replaced and several access levels must be coordinated.
Use the sample closest to the actual job, then adjust for parts and access conditions. A locksmith may charge more if doors are difficult to reach, cylinders are seized, or the site requires work outside normal business hours. The quote should say how many keys are included and the price for each additional copy.
Which key-system choices can lower the final bill
Keep the hierarchy as simple as operational needs allow. One master level and individual change keys are less complicated than several floor, department, and building-level groups. Before ordering, list who needs access to each door and identify any doors that do not need to join the system.
Reuse compatible locksets when they are reliable, and ask the locksmith to inspect a sample cylinder before pricing every door as a replacement. Grouping several doors into one visit spreads the trip fee across more work. Supplying a complete door list and key count in advance can also reduce revisions and return visits.
Choose the lowest hardware grade that meets the door’s use and security requirements, not the cheapest part regardless of fit. Standard commercial cylinders may be sufficient for interior offices, while exterior or high-traffic doors may warrant stronger hardware. Avoid buying extra keys before the access list is settled, and confirm the added-copy rate upfront.
Compare at least two or three written estimates with matching scope. Check whether each quote includes rekeying, new cylinders, locksets, keys, labor, travel, tax, and system documentation. A useful quote also identifies excluded repairs and gives a process for approving additional work, helping prevent a low starting price from turning into a larger invoice.