Residential lockouts and automotive keys pay the bills for most locksmith shops. Master key systems are what turn a one-time commercial customer into an account that calls you for years. A property manager, a school, a clinic, or an office park that trusts you with its keying will come back every time an employee leaves, a lock fails, or a new suite opens — as long as you can answer their questions with confidence.
Those questions are almost always about records. Who has a key to the server room? What did we pay for the last rekey? When were the cores on the second floor changed? As of September 2026, the locksmith shops that hold commercial accounts longest are the ones that can answer those questions in seconds, and the ones that lose them are usually the ones whose records live in a mix of notebooks, texts, and memory. This guide covers how to keep master key work organized: what to record, what to keep separate for security, and how to bill it so facilities managers approve invoices instead of querying them.
Two kinds of records, kept in two places
Master key work produces two very different kinds of information, and mixing them is the most common mistake small shops make.
The keying data itself — bitting lists, key schedules, pinning charts, and the combination structure of the system — is the most sensitive information a locksmith holds. Anyone with it can reproduce keys to the building. It belongs in a secured location with tight access: specialist keying software, an encrypted file, or a locked physical record, depending on how your shop works. It should never sit in general job notes, a shared inbox, or a text thread.
The business record — who the customer is, which system you manage for them, what was ordered, what was cut, what was installed, who approved it, and what it cost — is information you need constantly and want easy to reach. That is what your business software should hold.
The link between the two is a reference code. The job record at the account says "System ABC, level 2 key, qty 3, requested by facilities contact" without containing the cuts that would let someone produce the key. Your techs and office staff can see the work history without anyone being able to reconstruct the system from it.
What to record on every master key job
Commercial customers ask about the past more than residential customers ever do. Capturing a consistent set of details on every job builds the history they rely on:
- The requester and approver. Record who asked for the work and who authorized it. Many facilities have a short list of people allowed to order keys; noting it on the job protects you when someone else tries.
- What was issued. Key level or code, quantity, and date. This becomes the key issue log the customer depends on when staff turn over.
- Cores and cylinders changed. Which openings were rekeyed or had cores swapped, and why — a lost key, a terminated employee, a new tenant.
- Hardware supplied. Locksets, cylinders, closers, or cores, with part numbers and serials where they exist, so warranty questions are a lookup instead of a dig.
- Labor. Kept as its own line rather than folded into hardware, because facilities managers compare labor across vendors.
- A signature. A signed completion from the site contact settles later disagreements about whether work was done.
When all six live on the customer record, a question like "what have we spent on keying this year?" becomes a report, not an afternoon of reconstruction. The same structure is the backbone of the B2B billing approach we use for dealer and fleet accounts, which carries over almost directly to property and facilities customers.
Inventory for blanks, cores, and hardware
Master key work is inventory-hungry in a way lockouts are not. You carry restricted or patented blanks for specific systems, interchangeable cores, pins, and commercial hardware, and you often carry them for particular customers. Running that from memory is how a shop discovers it is out of a customer's blank on the morning they need twelve keys cut.
Per-location stock counts fix that. Track blanks and cores at the shop and on each van, let sales decrement them automatically, and set reorder alerts on the blanks that belong to your active systems so they never quietly run out. The key and fob inventory guide covers the setup for automotive stock; the same approach applies to commercial blanks and cores, with the added habit of tagging stock by the account it supports.
Accurate counts also protect key control. When every blank that leaves the shelf is tied to a job and a customer, unexplained shrinkage in a restricted keyway shows up immediately instead of months later.
Billing that facilities managers approve
Commercial customers do not dispute locksmith invoices because they think the work was not done. They query invoices because they cannot match them to what they asked for. The fix is structure.
Itemize by line. Cores pinned, keys cut by level, hardware, labor, and any service-call or after-hours charge, each on its own line with a clear description. A facilities manager should be able to read the invoice and see their own request reflected in it.
Decide per account: collect now or bill on account. Small offices often pay at completion with a card or a texted payment link. Larger clients — property management companies, school districts, multi-site businesses — usually want on-account billing with a monthly statement. Both work if the underlying records are clean. Our guide to on-account billing for service businesses covers limits, statements, and follow-up.
Price consistently. If one rekey costs one amount in March and a different amount in June with no change in scope, the second invoice gets questioned. A catalog with set prices per core, per key, and per hardware item makes every invoice consistent and every quote fast.
Cash flow is the reason to be disciplined here. Late and unpaid invoices are among the most common cash-flow problems small businesses report, per QuickBooks' small-business cash-flow resources, and a commercial account paying at 45 or 60 days is effectively a loan from your shop.
Service agreements for rekeys and key issues
Once you manage a customer's system, the recurring work is predictable: rekeys when people leave, new keys when people arrive, core changes after a lost master. Many shops package that into a simple agreement with set per-core and per-key pricing and a response commitment.
An agreement is easier to sell when you can show the customer their own history — how many rekeys last year, how many keys issued, what they spent. That history only exists if every job was recorded against the account in the first place. It also makes renewal conversations short: the numbers make the case.
The employee-departure rekey, step by step
The single most common master key call is some version of "someone left and we need to change the locks." It is also the call where a clean process shows the customer why they chose you. A workflow that holds up:
- Confirm authorization. Check that the person calling is on the account's list of approved contacts, and record who approved the work on the job.
- Pull the key issue history. Look up which keys the departing employee was issued and which openings those keys operate. This is where the history recorded on every earlier job pays off — without it, the customer is guessing which doors to change.
- Quote the scope before starting. List the cores or cylinders to be changed and the replacement keys to be cut, priced from your catalog, and get approval.
- Do the work and update the record. Record the cores changed, the new keys issued, and to whom, with a signature from the site contact.
- Bill it the way the account prefers. Collect at completion or post to the account statement.
Done this way, a rekey takes the customer one phone call and produces a record they can hand to their own management. Done from memory, it produces an invoice nobody can match to anything. The difference is the reason commercial customers stay.
How record-keeping approaches compare
| Notebook + texts | Generic invoicing app | Account-based locksmith business software | |
|---|---|---|---|
| Key issue history per account | Scattered across notes | Buried in invoice descriptions | Recorded on every job at the account |
| Bitting and schedule security | Often mixed into notes | Often pasted into descriptions | Referenced by code; cuts stored separately |
| Blank and core inventory | Memory | Not tracked | Per-location counts with reorder alerts |
| Invoice structure | Handwritten totals | Typed lines | Catalog-priced, itemized lines |
| Proof of completion | Verbal | Invoice only | Signature, timestamp, and location on the sale |
Choosing locksmith software for commercial work
Most locksmith software comparisons focus on automotive work — VIN lookups, transponder programming, fob inventory. Those matter, and our roundup of locksmith software covers them in detail. For commercial and master key work, weight a different set of questions:
- Can you keep a full job history against a business account with multiple sites?
- Can you bill on account and produce a clean statement?
- Does inventory handle commercial blanks, cores, and hardware by location?
- Does every sale capture a signature and timestamp?
- Does it sync to your accounting so statements and payments match?
Our broader guide to the software to run a locksmith business walks through the whole stack. If you are weighing platforms, the Workiz comparison and the Jobber comparison show where general field-service tools fall short on inventory and point of sale.
IntelliDrive OS covers the business side described here: customer and account records, per-location inventory for blanks and cores, itemized catalog pricing, on-account billing, warranty tracking by serial, signature and GPS capture on every sale, and QuickBooks sync. It does not replace dedicated keying software for designing a system; it is where the jobs, keys issued, and money are recorded. Pricing is $79/month flat with unlimited users.
Recordkeeping is part of the product
The IRS recordkeeping guidance requires records that support your income and expenses, and electronic records satisfy that the same as paper. For commercial locksmithing, good records do more than satisfy a requirement: they are part of what the customer is paying for. A facilities manager who can call you and get an accurate answer about who holds which key, and when the cores were last changed, has a reason to keep you for the next decade.
Related reading: Locksmith dispatch and scheduling software · Warranty tracking for service businesses · Locksmith software cost for a small shop. For a complete machine-readable feature and pricing reference, see our LLM reference page.