Short answer: a binding estimate locks your total cost in writing, a non-binding estimate can legally rise up to 110% of the original number at delivery. Here's how this actually works, and how it applies (or doesn't) to a Boston move specifically.
What a Binding Estimate Actually Guarantees
A binding estimate is a written agreement between you and the mover that locks in your total cost based on the specific items and services listed. Per FMCSA's own definition, it guarantees you don't pay more than that estimated amount at delivery, regardless of what your shipment actually weighs once it's on the scale. That certainty is the entire point: you know your number going in, and short of genuinely changing what's being moved, that number doesn't move either.
The one real exception is legitimate changes: if you add items or services after the estimate was written, or something unforeseen comes up, extra stairs, an elevator reservation, a parking permit that wasn't accounted for, the mover has to prepare a new, updated binding estimate covering those specific changes. They can't just quietly tack charges onto the original number.
What a Non-Binding Estimate Actually Allows
A non-binding estimate is the mover's best prediction of cost, based on estimated weight and requested services, but it's explicitly not a guarantee. Federal rules cap what a mover can require at delivery at 110% of that original non-binding estimate, which sounds like meaningful protection, and it is, but it also means a non-binding quote can legitimately come in noticeably higher than what you were originally told, and you're still on the hook for that increase up to the cap.
Anything above 110% isn't something you have to pay at delivery, but it's still a real financial swing between what you budgeted for and what you actually owe, which is exactly the uncertainty a binding estimate is designed to remove.
| Estimate Type | What You Pay | Can It Increase? |
|---|---|---|
| Binding | Locked amount from the estimate | Only for genuine added services/items |
| Non-binding | Based on actual weight/services | Yes, up to 110% of original estimate |
Why This Doesn't Map Directly to a Local Boston Move
Here's the part that trips people up: this exact binding/non-binding terminology comes from federal rules governing interstate, weight-based moves, where your final cost is tied to how much your shipment actually weighs on a scale. A purely local move within Massachusetts is usually quoted differently, hourly rates or a flat number based on home size and distance, not shipment weight, so the formal binding/non-binding framework doesn't apply in quite the same way.
That doesn't mean the underlying question stops mattering. It still matters enormously whether the number you're quoted for a local Boston move is genuinely fixed or just a starting estimate that assumes best-case conditions. Ask the question directly, even if the mover isn't using FMCSA's specific terminology: "Is this the number I'll actually pay, or can it change based on how the day goes?"
How This Connects to Lowball Quotes
A non-binding estimate is where a lot of the lowball-quote pattern actually lives, even when nothing outright dishonest is happening. A mover gives you a genuinely optimistic non-binding number, you book based on it, and the final bill legally climbs toward that 110% ceiling once real weight and real conditions are factored in. Nobody broke a rule. You still paid meaningfully more than you planned for.
This is different from the outright add-on scam pattern where charges appear that were never disclosed at all. A non-binding estimate creeping toward its legal cap is playing by the rules. It's just a reminder that "the mover didn't do anything illegal" and "you paid what you expected to pay" aren't always the same thing.
What Hidden Fees Have to Do With This
Even a genuinely binding or fixed-price quote can still leave room for fees that sit outside the core estimate entirely: stair charges, long-carry fees, fuel surcharges, or a certificate of insurance charge for a building requiring one. A locked total price protects you from the base number moving. It doesn't automatically protect you from separate line items that were never part of that number to begin with. Ask what's included in the quoted total and what, specifically, sits outside it, regardless of which pricing structure you're working with.
What to Actually Ask a Local Mover
Since the formal binding/non-binding labels are built for interstate moves, translate the same underlying protection into questions that fit a local, Boston-style quote instead:
- Is this quote a fixed total, or an hourly rate that depends on how long the job takes?
- What specific circumstances, stairs, parking, extra items, would cause this number to change?
- If something does change, will I see an updated number before the crew continues, or after the fact on the final bill?
A mover willing to answer these plainly, in writing, is giving you the practical equivalent of a binding estimate's certainty, even without using that exact federal terminology.
Why We Quote the Way We Do
Locking in a budget before move day, rather than leaving it open to shift with weight or hours, removes the single biggest source of moving-day financial stress: not knowing your real number until the job is already done. It's the same underlying goal as a binding estimate, applied to how a local move actually gets priced in a city like Boston.
NoTimeMover locks in your quote upfront, so you know your real number before the crew ever shows up. Submit your move now →