Technology and AI

Construction data security basics for contractors

For most contractors, data security comes down to a short list: require multi-factor authentication, verify every change to bank details by phone, give each person their own login, shut off access the day someone leaves, keep backups an attacker cannot reach, and hold software vendors to written security terms.

Two construction professionals review paper plans beside a tablet at a jobsite workbench.
Plan reviews connect field conditions, drawings, and the next decisions on a job. AI-generated illustration.

Construction data security is mostly about protecting money, not secrets. Contractors move large payments to subs and suppliers on predictable schedules, handle bank details and Social Security numbers for payroll, and share drawings and pay apps with dozens of outside companies. That makes a mid-size GC or trade contractor an attractive target. The basics that stop most problems are not expensive: multi-factor authentication, a call-back rule for payment changes, one login per person, fast offboarding, reliable backups, and clear rules for vendors.

Why construction companies get targeted

The FBI's Internet Crime Complaint Center (IC3) 2024 report lists business email compromise (BEC) at 21,442 complaints and $2,770,151,146 in reported losses for the year. BEC is the scam where a criminal poses as a known vendor or executive by email and asks for a payment or a change in bank details. Construction fits the pattern almost perfectly:

  • Large, recurring payments to subs and suppliers, often by ACH or wire.
  • Many outside parties emailing invoices, lien waivers, and pay apps, so an unfamiliar sender does not look odd.
  • Office staff under pressure to pay before a deadline so a crew keeps working.
  • Field staff on shared tablets and personal phones.
  • Payroll files holding Social Security numbers and bank accounts for every worker.

The 8 security basics every contractor should have

  1. Turn on multi-factor authentication (MFA) everywhere. Email first, then banking, accounting, payroll, and project software. CISA recommends requiring MFA wherever possible, starting with admin accounts and people who handle sensitive data, and using the strongest method available (security keys or authenticator apps over text-message codes).
  2. Verify every bank change by phone. Any request to change where a sub, supplier, or employee gets paid is confirmed by calling a number you already have on file, never one in the email. The FTC recommends verification steps like calling to confirm wire transfers.
  3. Give everyone their own login. No shared "jobsite" account on the tablet. Individual logins give you an audit trail and let you remove one person without changing everyone's password.
  4. Offboard the same day. When a PM, super, or bookkeeper leaves, disable email, project software, accounting, shared drives, and bank access before they leave the building.
  5. Use strong, unique passwords. The FTC suggests at least 12 characters or a passphrase of random words, and never reusing passwords. A password manager makes this realistic.
  6. Back up and keep a copy offline. The FTC recommends regular backups kept disconnected from your network so ransomware cannot reach them. Test a restore at least once.
  7. Patch and update. Phones, laptops, routers, and the office server. Unpatched systems are a common entry point.
  8. Set role-based permissions. Subs see their own scope, foremen cannot approve payments, and only two or three people can change vendor bank details.

Worked example: stopping a fake bank change

Say your concrete supplier is owed $86,400 on the 15th. On the 12th, accounts payable gets an email from what looks like the supplier's credit manager: new bank, new account number, please update before this payment. The email signature is right and the invoice attached is real (the supplier's mailbox was compromised).

Example only
StepWithout a processWith a call-back rule
Email arrivesAP updates the vendor record and pays on the 15thAP flags the request as a bank change and does not touch the vendor record
VerificationNoneAP calls the supplier's office number from the vendor file, not the email
Result$86,400 goes to a criminal; the supplier is still unpaid and may file a lienSupplier confirms it never changed banks; payment goes to the right account
Follow-upDiscovered weeks later when the supplier callsSupplier is warned its email is compromised; incident reported

Write the rule down, train AP on it, and require a second person to approve any change to vendor or employee bank details. If you discover a fraudulent transfer, contact your bank immediately and file a complaint with IC3; the IC3 report describes a Recovery Asset Team that works with banks to try to freeze funds.

Protecting project documents and field devices

  • Share drawings and documents through your project software or a controlled link with expiration, not through personal email attachments.
  • Lock phones and tablets with a PIN, turn on device location and remote wipe, and keep a list of which device is on which job.
  • Separate guest Wi-Fi in the job trailer from the network your office laptop uses.
  • Store payroll and personnel files with access limited to the people who process them.
  • Keep a document retention schedule so old files with Social Security numbers are destroyed when they are no longer needed.

Holding software vendors to a standard

Your project management, payroll, and accounting vendors hold your most sensitive data. The FTC advises putting security requirements in vendor contracts, verifying compliance instead of taking the vendor's word, limiting vendor access to what they need, and encrypting data sent to and stored by vendors. Before signing, ask whether the software supports MFA for every user, role-based permissions, an audit log, and a full data export. The cloud-based construction software explained guide lists more questions.

Write a one-page security policy

A 30-person contractor does not need a binder. It needs one page everyone signs at hire and reviews once a year. Keep it short enough that a foreman will actually read it:

  • Who can approve payments, and who can change vendor or employee bank details (two different people).
  • The call-back rule for any payment change, with the words "never use the number in the email."
  • MFA is required on email and every business app; no exceptions for the owner.
  • Company devices are locked with a PIN, and lost devices are reported the same day.
  • Who to call when something looks wrong, and that reporting a mistake quickly will never get anyone in trouble.

That last line matters. A bookkeeper who clicked a bad link and reports it within ten minutes is an asset. One who hides it out of fear turns a small problem into a large one.

Mistakes to avoid

  • Treating security as an IT project instead of an accounts payable process. Most losses start with an email and end with a payment.
  • Using text-message codes when an authenticator app is available.
  • Keeping a former employee's email active "to catch messages." Forward it to a manager instead and disable the login.
  • Having no plan for a ransomware day. The FTC recommends keeping a plan to run the business during an attack.
  • Assuming small companies are not targets.

Smart Business Automator gives each user a role-based login, keeps an audit trail on change orders, invoices, and subcontractor records, and stores compliance documents with the job instead of in inboxes. See subcontractor compliance automation and how to automate construction paperwork.

Frequently asked questions

What is the biggest cybersecurity risk for contractors?

For many contractors it is payment fraud through email, where a criminal poses as a sub, supplier, or executive and redirects a payment. A strict call-back rule for any bank change prevents most of it.

Do small contractors need cyber insurance?

Many carriers now offer it and some require controls like MFA and backups before they will quote. Talk to your broker about what the policy covers, including funds transfer fraud, which is sometimes excluded or sublimited.

Is text-message MFA good enough?

It is better than no MFA. CISA ranks text or email codes as the weakest option and recommends security keys or authenticator apps where available.

What should we do if we sent money to a fraudster?

Call your bank right away and ask it to recall the transfer, then file a complaint with the FBI's IC3. Speed matters for any chance of recovery.

How often should we back up?

Often enough that losing the data since the last backup would be tolerable. Keep at least one copy disconnected from the network and test that you can restore it.

Sources

  1. FBI Internet Crime Complaint Center: 2024 Internet Crime Report
  2. Federal Trade Commission: Cybersecurity for Small Business
  3. CISA: Require Multifactor Authentication
Written and edited by

Maurice Francois writes and edits construction operations guides for Smart Business Automator. More from Maurice on the Scaling Legends podcast.

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