Lena: This is the part that usually makes people’s heads spin—the difference between a bid, an estimate, and a quote. In common conversation, we use them interchangeably, but in a legal contract, they mean very different things, right?
Miles: Oh, absolutely. Mixing those up is probably the fastest way to lose money or end up in a dispute. An "estimate" is really just a cost prediction. It’s a forecast based on the info you have at the time—it’s preliminary. But a "bid"? That’s a formal, fixed-price offer to complete a defined scope of work. If you submit a bid and it’s accepted, you are generally bound to that price for that specific scope.
Lena: So an estimate is a "maybe," and a bid is a "commitment." What about a "quote," then?
Miles: A "Request for Quote," or RFQ, is usually for a specific task or a specific material. It’s a bit more focused than a full construction bid, which usually includes labor, materials, equipment, overhead, and profit. Then you have the "Request for Proposal," the RFP, which is where the owner is asking you to provide a detailed solution, your qualifications, and your approach, not just a price.
Lena: It’s like a job interview but for a whole company. And once that proposal is accepted, you get into the actual contract structures. I was fascinated by the "Guaranteed Maximum Price," or GMP. It sounds great for the homeowner because it sets a ceiling, but it sounds risky for the contractor.
Miles: It can be. A GMP contract caps the total price the owner will pay. If the costs go over, the contractor eats the difference. However, it often involves "open-book" cost tracking. So if the project comes in under the cap, there might be shared savings. It’s a way to limit the owner’s risk while allowing the project to start before every single detail is finalized—what we call "fast-track construction."
Lena: "Fast-track" meaning you start building before the design is 100% done?
Miles: Exactly. You’re finishing the design as you go. It’s efficient, but it requires a very high level of trust and very clear terminology. Contrast that with a "Lump Sum" or "Fixed Price" contract. That’s one total price for everything. The contractor bears all the risk of cost overruns, but they also keep all the profit if they find efficiencies.
Lena: And then there’s "Time and Materials," or T&M. My understanding is that’s the most open-ended one.
Miles: It is. The owner pays for actual labor time at agreed rates plus the cost of materials, usually with a markup. It’s great when the scope is totally unknown—like when you’re doing a demo and you don't know what’s behind the walls yet—but it requires the owner to monitor the project very closely so the budget doesn't just balloon.
Lena: That makes sense. Now, let’s talk about the paperwork that keeps the money moving. We mentioned "Lien Waivers" earlier. Why are they so critical during the payment process?
Miles: Because a mechanics lien is a legal claim a contractor or sub can make against the owner’s property if they aren't paid. A "Lien Waiver" is the document the sub signs saying, "I’ve received my payment, and I relinquish my right to file a lien for this amount." As a GC, you have to collect these from your subs every time you pay them to protect the homeowner.
Lena: And then there’s "Retainage." I’ve heard this can be a point of contention. It’s basically a portion of the contract price that the owner holds back, right?
Miles: Usually 5% to 10%. It’s the "carrot" to make sure the contractor actually finishes the "Punch List"—that final list of tiny deficiencies like a crooked cabinet door or a missing bit of caulk. The owner keeps that retainage until "Substantial Completion" is reached.
Lena: And "Substantial Completion" is another one of those terms with a very specific legal weight. It doesn't mean the house is perfect; it means it’s sufficiently complete for its intended use.
Miles: Right. The owner can move in. The clocks for warranties and statutes of limitations usually start ticking at substantial completion. It’s a major milestone. If you’re taking the exam, you need to know that "Final Completion" is when the punch list is zeroed out and the final payment, including retainage, is released.
Lena: It’s all about the "Scope of Work," or SOW. If it isn't in the SOW, it isn't in the contract. And if the owner wants something that isn't in the SOW, that’s when we get into "Change Orders."
Miles: The dreaded change order! But really, it’s just a written amendment. It modifies the price, the schedule, or the scope. Unsigned change orders are the leading cause of disputes in residential construction. If a roofer finds rotted decking and just replaces it without a signed change order, they’re doing that work at a financial risk. They might not get paid for it.
Lena: So the lesson for the journeyman moving into management is: document everything. If it isn't in writing, it didn't happen.
Miles: Precisely. Whether it’s a "Field Order"—which is just a minor clarification that doesn't change the contract—or a full-blown change order, the paper trail is your best friend.