Windows 10 End of Support Passed in October 2025. What Southern Colorado Construction Firms Should Do Now

Windows 10 hit End of Support on October 14, 2025. If your Fountain, Pueblo, or Colorado Springs construction business is still running Windows 10 on any machine this morning, those devices are no longer getting security updates from Microsoft. Not today, not next month, not ever. Every critical vulnerability published after that date is permanent on those machines.

That's the reality most of the small businesses we walk into in Southern Colorado are still living with. Not because nobody told them, but because the deadline quietly passed during busy season, migration projects got deprioritized behind actual revenue work, and eighteen months later the problem's still there.

Here's what actually matters now, what it costs to keep limping, and how to catch up without burning a month of billable time.

What "end of support" actually changed

As of October 15, 2025, Microsoft stopped issuing free security patches for Windows 10. The operating system still runs. Your estimating software still opens. Your printers still work. This is the problem: nothing breaks visibly, so nothing forces the issue. Meanwhile, any new vulnerability in the Windows 10 kernel, browser, or core services stays unpatched forever on your machines.

Microsoft is offering paid Extended Security Updates (ESU) for Windows 10, but the pricing gets uncomfortable fast for a small business. The per-device cost climbs year over year, is billed on top of whatever other Microsoft licensing you carry, and is explicitly a stopgap, not a solution. For a construction firm with 15 to 40 Windows machines spread across an office, a trailer, and a shop, ESU is rarely the right move once you compare it to the cost of moving forward.

Why Southern Colorado construction offices get stuck here

A few patterns show up over and over when we audit construction-firm networks in the Pueblo and Colorado Springs area.

Estimating software fear. Sage 100 Contractor, Procore, Foundation, RedTeam: nobody wants to be the one who upgrades the machine and breaks the bid workflow the week before a proposal is due. So the estimator's box stays on Windows 10 past EOL because the upgrade is "high-risk" until scheduled quiet time shows up. Quiet time doesn't show up.

Trailer laptops age out differently. The office laptops get touched yearly. The two or three machines at a job trailer get forgotten for three years. They often turn out to be the oldest Windows 10 boxes in the whole company, running on hardware that also can't meet Windows 11's minimum requirements (TPM 2.0, supported CPU generation).

Mixed Windows versions create real risk. A network where half the machines are on Windows 11 and half on unsupported Windows 10 is harder to defend than either extreme. Patch baselines diverge, endpoint security tools behave differently on each OS, and phishing or credential-theft attacks that touch the weakest link spread laterally to the rest.

What it costs to keep running Windows 10

The hard costs are visible in two places.

First, cyber insurance. Most cyber-insurance carriers now ask, at renewal, whether you run any unsupported operating systems. "Yes" answers either raise the premium, add exclusions (the carrier won't pay claims tied to a Windows 10 machine), or disqualify you entirely for certain policies. Our clients who renewed in the last six months have all gotten this question in writing.

Second, specific compliance pressure. If you handle cardholder data, you're subject to PCI DSS requirements around supported software. If you're a sub on a federal or defense project, CMMC and DFARS requirements reference supported operating systems explicitly. General construction might not touch these directly, but increasingly the general contractors do, and they push down the requirements to their subs.

The soft costs are worse. A ransomware attack that enters via an unpatched Windows 10 endpoint tends to spread faster than one that hits a well-patched Windows 11 environment. Recovery time goes up. Depending on your backup posture, recovery might not be full.

How to catch up without losing a month

What works for most construction offices we walk in on looks like this.

Inventory first. Before any upgrade planning, get a real list: how many endpoints, what Windows version is on each, what hardware generation, what role (estimator, PM, super, trailer, yard, shop). This is a two-hour exercise, and it routinely surfaces three or four machines nobody remembered were still in service. We use our RMM to pull it automatically, or a CSV export from whatever you have.

Classify each device into one of three buckets. (1) Hardware meets Windows 11 requirements and the software is compatible: these are in-place upgrades, usually one evening per device. (2) Hardware meets Windows 11 but the software is a question mark: needs a test run on one device before full rollout. (3) Hardware doesn't meet Windows 11 requirements: these are replacements, not upgrades. Plan for the cost.

Start with the replacements, not the upgrades. Replacement timelines have supply-chain lead time (2 to 6 weeks depending on model) and more friction for the user. Get those started while you still have Windows 10 on the floor, then do the in-place upgrades in batches after the replacements arrive and you've validated the software stack.

Do the trailer machines last but deliberately. They feel low priority, but they're usually the riskiest to ignore. Don't let them slip again. Put them on the calendar with a specific date and stick to it, even if the office machines are easier wins to knock out first.

If you're still on Windows 10 in April 2026

A few options, roughly in order of what makes sense for most Southern Colorado construction firms.

Option 1 is the right answer for almost everyone: move to Windows 11 on every device that supports it, replace the ones that don't. This ends the exposure, stops the insurance friction, and resets the hardware clock for the next five years.

Option 2, if your budget cycle makes Option 1 impossible this quarter: buy one year of Microsoft ESU for the non-upgradable machines only, use that year to replace them on a planned schedule. Don't buy ESU for everything. It's expensive and encourages drift.

Option 3, rarely the right call: migrate those non-upgradable machines to a Linux desktop or a thin client pointed at a cloud-hosted Windows environment. This is a real option for certain workflows, but it's a bigger change-management lift than most firms want to take on mid-year.

Option 4, not an option: keep running unsupported Windows 10 because nothing has broken yet. This is the one that ends in a ransomware claim with an insurance denial attached.

Where GTZ fits

We do this migration work for construction clients in Fountain, Pueblo, and Colorado Springs as part of managed IT, or as a one-time project. The approach is the same either way: inventory, classify, sequence, execute in batches small enough not to disrupt bid cycles.

If you want a no-obligation inventory review, we'll walk your office, catalog what you have, and tell you exactly which machines are upgradeable, which are replacements, and what it'll cost in hardware and labor. Book a 30-minute call and we'll put it on the calendar. Bring whatever Windows-device list you have, or none. We can pull it.