Your Change Order Notice Deadline Is Costing You More Than Bad Estimating

I spent years watching money disappear before I understood why.

Retail, then Telenor, then close enough to construction to see the same pattern on repeat: the work gets done, the invoice doesn’t match it, and nobody can say exactly where the gap came from. Everyone blames the estimate. The estimate was usually fine.

The real leak is quieter than that. It’s a change order notice deadline buried on page 40 of a GC agreement, and a field crew that’s too busy running the actual job to re-read it every week.

The number that should bother you more than it does

Change orders typically run around 10% of contract value — and on complex jobs, up to 25%, according to Dodge Data & Analytics. Separately, industry estimates put unbilled extras — work performed but never formally noticed, documented, or billed — at up to 20% of construction profit, gone.

Not because the work wasn’t done. Because nobody submitted a notice of claim before the window closed.

Most standard-form contracts are stricter about this than people realize:

• AIA A201–2017 gives you 21 days from the event to submit a general claim, and only 14 days for differing site conditions.
• ConsensusDocs 200 gives you 14 days for a claim notice.

Miss it, and in a lot of cases you don’t just lose leverage — you lose the contractual right to be paid for that work at all, regardless of how accurate your original estimate was.

Why “better estimating” isn’t the fix

The construction tech world loves talking about smarter takeoffs and predictive margins. Almost nobody’s building for the moment after the estimate — when scope actually changes on-site and someone has to catch it, document it, and hit a deadline they may not have even known existed.

That’s a documentation and deadline problem. Not an estimating problem. I think that distinction matters more than the industry currently treats it.

A free way to check your own exposure

If you want to see how tight these windows actually are, I built a small, free change order notice deadline calculator — pick a contract type (AIA A201, ConsensusDocs 200, or a custom day count) and a date, and it tells you exactly when your notice is due.

You can use it two ways:

• As a web tool, no install
• As a Chrome extension (pending Chrome Web Store approval — link going live shortly)

It’s not trying to sell you anything. It’s the same logic I kept doing by hand until I got tired of doing it by hand.

What I actually built

The calculator is a small piece of something bigger. I built **ScopeLedger** — change order and notice deadline tracking built specifically for electrical, mechanical, HVAC, and fire protection contractors. Not another all-in-one platform trying to also be your accounting software and your scheduling tool. Just the piece that most of those platforms — and most Procore alternatives for change orders — treat as an afterthought.

The core view is an executive portfolio: approved contract value, pending exposure, and notice windows at risk, all in one place, with an evidence-confidence score behind every number instead of a spreadsheet you have to trust blindly. If a notice window closes in two days, it says so, in plain language, before it becomes a conversation with a lawyer.

I’ve been running it against a pilot project on synthetic data while I finish onboarding the first real client, so the numbers in the dashboard aren’t a live customer’s yet — but the mechanics are real: approved movement, pending exposure, notice pressure, and a document register underneath it that never silently overwrites anything.

The thesis is simple: if you’re a specialty trade contractor losing money, it’s far more likely to be sitting in a missed notice window than in a bad number on a bid.

I’m building this in public and I’d rather show the work than talk about it in the abstract. If you want to follow along, I’m posting updates on Product Hunt.

If you’re in the trades

I’d genuinely like to hear how you currently track this — spreadsheet, sticky notes, memory, a PM who just happens to be good at it. Drop a comment. I’m collecting exactly this kind of ground truth right now, and it’s shaping what gets built next.