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Written by Mike Pearlstein, CISSP, CEO of Fusion Computing Limited. Helping Canadian businesses build and manage secure IT infrastructure since 2012 across Toronto, Hamilton, and Metro Vancouver.
A mid-size contractor moves more money in a single progress draw than most retailers see in a quarter. Attackers worked that out years ago. Between 2023 and 2024, phishing attacks on Canadian construction companies rose 83%, and one Canadian contractor lost $9 million CAD to a single ransomware incident.
Fusion Computing has secured Canadian construction and trades firms since 2012, and the pattern we see on intake is consistent: strong operations, thin defences, and a payment workflow built on trust. This guide covers what’s actually hitting the sector and the controls that stop it.
Short answer: Cybersecurity for construction firms in Canada comes down to defending 3 things: the draw-payment approval chain, the shared project environment (drawings, PM platforms, subcontractor access), and the ability to recover from ransomware without paying.
In practice that means MFA on every account, payment-change verification callbacks, least-privilege project shares, tested backups, endpoint detection, and staff trained on construction-specific lures.
KEY TAKEAWAYS
- Construction is now a top-3 attacked sector. Canada ranks second worldwide by victim count, and phishing against Canadian construction firms rose 83% in a year.
- The progress draw is the target. Business email compromise against draw and holdback payments steals more from contractors than malware does.
- People and passwords open the door. Verizon found 60% of breaches involve the human element, with credential abuse the top entry vector at 22%.
- Site technology counts now. IoT malware targeting construction jumped 410% year over year, and connected equipment sits on the same networks as your books.
- Recovery is a choice you make in advance. 74% of Canadian ransomware victims paid; firms with tested, immutable backups don’t have to.
Why are construction firms now a top cyber target in Canada?
Construction ranked among the top 3 most-attacked industries in 2025, and Canada sits second worldwide by victim count, according to Rapid7’s sector threat research. Attackers like the combination: large recurring payments, hard project deadlines, a deep subcontractor ecosystem, and security budgets that lag the money flowing through the firm.
The growth numbers are the real warning. Canadian Underwriter reported in June 2026 that phishing attacks on Canadian construction companies rose 83% between 2023 and 2024, with ransomware up 41% over the same window. One Canadian contractor took a $9 million CAD hit from a single ransomware incident.
Deadlines make contractors good victims. A locked estimating server two weeks before a tender close, or a frozen PM platform mid-pour, creates pressure no retailer feels. The 2025 CIRA survey found 74% of Canadian ransomware victims paid, and attackers price that urgency in.
The Progress-Draw Fraud Kill-Chain: how construction firms actually get robbed
The Progress-Draw Fraud Kill-Chain: how construction firms actually get robbed. Fusion Computing helps Canadian SMBs approach cybersecurity for construction firms canada in a practical, compliant way, focusing on the decisions and trade-offs that matter for a regulated business.
Want to know if your draw process would survive a spoofed banking change? Talk to us →
The Progress-Draw Fraud Kill-Chain is the 5-step pattern behind most construction payment fraud, according to what Fusion Computing sees across Canadian contractor engagements: public recon on project awards, a phished mailbox in the payment chain, weeks of silent observation, a banking-detail change timed to a draw or holdback release, and a transfer that clears before month-end reconciliation.
Each step has a defence. Recon you can’t stop; project awards are public. The phish is blocked by email defence and MFA, because a stolen password with MFA in front of it is a dead end in 9 cases out of 10.
The observation phase is where logging matters: a mailbox rule that forwards anything with “draw” or “invoice” to an external address is the classic tell, and endpoint or Microsoft 365 monitoring catches it. The banking-detail change is beaten by a process control, not a product: every payment-detail change gets a callback to a known phone number plus dual approval in finance.
That last control costs nothing and would have stopped most of the construction BEC losses we’ve reviewed. The Canadian Anti-Fraud Centre counted a record CA$704 million in reported fraud losses in 2025, and estimates only 5 to 10 percent of incidents are ever reported.
What 7 controls stop the attacks construction firms actually face?
Seven controls cover the construction threat model: MFA everywhere, email and phishing defence, payment-change verification, least-privilege project shares, tested immutable backups, endpoint detection, and construction-specific awareness training. They map directly to how breaches start; Verizon’s 2025 DBIR found 60% of breaches involve the human element and credential abuse leads entry vectors at 22%.
| Control | Construction workflow it protects | Minimum standard |
|---|---|---|
| 1. Multi-factor authentication | Email, PM platform, bank portal, estimating server | MFA on every account; legacy sign-in blocked |
| 2. Email and phishing defence | Draw notices, tender documents, CRA and WSIB lures | Advanced filtering, external-sender banners, link scanning |
| 3. Payment-change verification | Progress draws, holdback releases, sub payments | Callback to a known number + dual approval on any banking change |
| 4. Least-privilege project shares | Drawings, contracts, joint-venture folders | Per-project access that expires at substantial completion |
| 5. Tested, immutable backups | Estimating data, project records, accounting | Immutable copies with a restore tested at least quarterly |
| 6. Endpoint detection (EDR) | Office workstations, site laptops, trailer machines | Managed EDR with 24/7 response, not just antivirus |
| 7. Awareness training | PMs, site supers, accounting clerks | Quarterly phishing simulations using construction lures |
None of the 7 requires an enterprise budget. They require a right-sized stack for a 25 to 200 person firm and one accountable owner, which is the role our managed IT services team plays for contractors. The order matters: credentials and email first, because that’s where the money leaves.
Where do project platforms, drawings, and site IoT fit in?
The shared project environment is the sector’s structural weakness: a typical Canadian project connects the GC, 15 to 40 subcontractors, consultants, and the owner through shared platforms and file links, and every connected party is a potential way in. Zscaler measured a 410% year-over-year jump in IoT malware targeting construction, per Canadian Underwriter.
Project management platforms like Procore or Autodesk hold your drawings, RFIs, and contracts, and they’re only as secure as the weakest login with access. Single sign-on through Microsoft 365 with MFA, plus per-project access that actually gets revoked, closes most of that exposure.
Site technology is the newer problem. Telematics on heavy equipment, connected cameras, and trailer Wi-Fi routers ship with default passwords and rarely get patched. Segment them: site IoT on its own network, never bridged to the office network where your accounting and estimating systems live. Our zero-trust guide for Canadian SMBs covers the access model that makes this manageable.
What do Canadian rules and cyber insurance expect from a contractor?
What do Canadian rules and cyber insurance expect from a contractor. Our team helps Canadian SMBs approach cybersecurity for construction firms canada in a practical, compliant way, focusing on the decisions and trade-offs that matter for a regulated business.
Why Canadian firms bring this work to Fusion Computing
CISSP-led, a Microsoft Solutions Partner and a CompTIA Managed Services Trustmark holder, securing IT for Canadian SMBs across Toronto, Hamilton, and Metro Vancouver since 2012.
Book a 20-minute call about your firm’s 90-day hardening plan →
The sharper enforcement mechanism is your insurer. Cyber-insurance applications now ask for MFA, EDR, tested backups, and payment-verification procedures by name, and a wrong answer either voids coverage or prices it brutally. Our guide to cyber insurance requirements for Canadian businesses maps the control list insurers actually check.
The stakes scale with the sector’s money: IBM’s 2025 Cost of a Data Breach report puts the average Canadian breach at CA$6.98 million, up 10.4% in a year. For a contractor, the bigger number is usually the project delay: liquidated damages don’t pause while you rebuild servers.
What mistakes do we see in the field at construction firms?
What mistakes do we see in the field at construction firms. Our team helps Canadian SMBs approach cybersecurity for construction firms canada in a practical, compliant way, focusing on the decisions and trade-offs that matter for a regulated business.
The spending instinct is usually backwards. Firms ask for a firewall upgrade when the exposure is a clerk who can change banking details from an unprotected mailbox. Spend on identity, email, and payment process first; per the 2025 CIRA Cybersecurity Survey, 43% of Canadian organizations were targeted in 12 months, and the attacks that landed came through people, not perimeter gear.
The “we’re too small” objection doesn’t survive contact with the data either. Attackers scan for unpatched systems and leaked credentials; they don’t pre-screen revenue. A 30-person trades company with a healthy receivables flow is exactly the right size to pay a 6-figure ransom, and right-sized security for that firm is a different stack, not a smaller enterprise one. The National Cyber Threat Assessment 2025-2026 calls cybercrime the most common cyber threat activity affecting Canadians.
What does a 90-day hardening plan look like for a contractor?
90 days is enough to close the doors that matter, according to the rollout Fusion Computing runs for contractors. Days 1 to 30: MFA everywhere, legacy sign-in blocked, payment-change verification written and signed by finance. Days 31 to 60: EDR on every machine, project-share permissions rebuilt, site IoT segmented. Days 61 to 90: backup restore tested, incident plan written, first phishing simulation sent.
| Phase | What gets done |
|---|---|
| Days 1-30 | MFA everywhere, legacy sign-in blocked, payment-change callback rule signed by finance |
| Days 31-60 | EDR on every machine, project-share permissions rebuilt, site IoT segmented |
| Days 61-90 | Backup restore tested, incident plan written, first phishing simulation sent |
The sequence front-loads the draw-fraud defences because that’s where contractors actually lose money first. Ransomware resilience lands second, and the training cycle makes both stick. A free cybersecurity assessment tells you which of the 7 controls you already have and which gaps an attacker would find first.
If you’d rather see the industry context first, our IT services for construction firms page covers the full operational stack, from estimating servers to site connectivity, and the ransomware recovery playbook shows what the bad week looks like when preparation was skipped.
Where should you start?
Start with the 2 controls that stop real losses: MFA on every account in the payment chain, and a written callback rule for any banking-detail change. Then test a backup restore before someone else tests it for you. Fusion Computing runs this rollout for Canadian contractors in 90 days.
Fusion Computing helps Canadian businesses across Toronto and the GTA, Hamilton, and Metro Vancouver with managed IT, cybersecurity, and Microsoft 365.
Frequently Asked Questions
Why are construction companies targeted by cyber attacks?
Construction firms move large recurring payments through progress draws, run on hard deadlines, and connect dozens of subcontractors through shared platforms. That mix made the sector a top-3 target in 2025, with Canada ranked second worldwide by victim count. Attackers know a contractor facing liquidated damages will pay faster than almost any other victim.
What is progress-draw fraud?
Progress-draw fraud is business email compromise aimed at construction payments. An attacker phishes a mailbox in the payment chain, watches the draw cadence for weeks, then submits altered banking details timed to a draw or holdback release. The transfer clears before month-end reconciliation. A callback to a known phone number plus dual approval on any banking change defeats it.
Get the 7 controls mapped against your current setup before tender season →
How much should a construction company spend on cybersecurity?
For a 25 to 200 person Canadian contractor, right-sized managed security typically runs a few hundred dollars per user per month all-in, far below the cost of one diverted draw. Spend order matters more than spend size: identity and MFA first, email defence second, payment verification third, because that chain is where construction firms actually lose money.
Is a small contractor really at risk?
Yes. Attackers scan for unpatched systems and leaked credentials without pre-screening revenue, and per the 2025 CIRA survey 43% of Canadian organizations were targeted in 12 months. A 30-person trades company with healthy receivables is the right size to pay a 6-figure ransom, which is exactly how attackers price it.
Are project management platforms like Procore secure?
The platforms themselves are generally well built. The exposure is access: shared logins, no MFA, and subcontractor accounts that never get revoked after substantial completion. Connect the platform to your Microsoft 365 identity with single sign-on and MFA, and rebuild per-project permissions so access expires when the project closes.
What should we do about subcontractor cyber risk?
Treat subs like the connected parties they are. Limit each sub to its own project folders, require MFA on accounts you issue, and verify any payment-detail change by phone regardless of who appears to ask. A typical Canadian project connects 15 to 40 subcontractors, and one compromised sub mailbox is the most common way draw fraud enters a GC.
Does site equipment and IoT really need security?
It does now. IoT malware targeting construction jumped 410% year over year, and telematics units, connected cameras, and trailer routers ship with default passwords. The fix is segmentation: site devices live on their own network, never bridged to the office network that holds estimating and accounting systems.
What do cyber insurers require from construction companies?
Applications now ask by name for MFA on email and remote access, endpoint detection and response, tested backups, and written payment-verification procedures. A wrong answer can void coverage after a claim. Treat the application as a control checklist: every question maps to one of the 7 baseline controls in this guide.
How fast can a construction firm reduce its cyber risk?
Materially within 30 days. MFA everywhere, legacy sign-in blocked, and a written callback rule for banking changes close the draw-fraud path almost immediately. Endpoint detection and rebuilt project-share permissions land by day 60, and a tested backup restore plus incident plan complete the 90-day baseline Fusion Computing runs for contractors.
Does PIPEDA apply to construction companies?
Yes, for the personal information a contractor holds: employee records, client contacts, and payroll data. Breaches posing a real risk of significant harm have required reporting to the Privacy Commissioner since November 1, 2018, with records kept 24 months. Most contractors meet the bar through the same 7 controls their insurer already expects.
