A bill of materials (BOM) is an itemized list of the materials needed for a job or a part of it, with quantities, sizes, specifications, and units, used to price, order, and track materials.
Material quantities, delivery timing and equipment availability shape the next phase of work. AI-generated illustration.
A bill of materials, or BOM, is a shopping list built from the drawings. It lists each material with the exact size, spec, quantity, and unit: 2x6 SPF #2 studs, 9 feet 1 inch, 640 each. Estimators use it to get supplier pricing. PMs and purchasing use it to write purchase orders and to check deliveries.
A quantity takeoff measures quantities from the plans, such as 4,800 square feet of wall. The BOM turns that into orderable products: so many sheets of 5/8 inch Type X drywall, so many boxes of screws, so many tubes of sealant, with waste added.
Example: framing BOM for one floor
Partial BOM, level 2 framing
Item
Spec
Quantity
Unit
Note
Studs
2x6 SPF #2, 9 ft 1 in
640
Each
Includes 10 percent waste
Top and bottom plate
2x6 SPF #2, 16 ft
210
Each
Headers
LVL 1.75 x 11.875
18
Each
Per structural schedule
Wall sheathing
7/16 in OSB, 4x9
148
Sheets
Shear wall nailing per S-301
Hold-downs
Per structural schedule
24
Each
Confirm model with engineer
Nails
Coil, 0.131 x 3 in
12
Boxes
Once the BOM is done, it goes to two or three suppliers for pricing. Lead times come back with the quotes. If the LVL headers are three weeks out and framing starts in two, the PM knows now, not the morning the crew shows up.
The waste column deserves attention. A framer who orders the exact count from the takeoff will be short by the second wall. One who adds a flat 15 percent to everything ends up with a pile of headers and hold-downs nobody needed. Engineered items like LVLs and hardware are usually ordered to the count, while commodity lumber and sheet goods get a waste factor based on the company's own history.
How BOMs are used through the job
Estimating: price per line, plus tax and delivery.
Procurement: break the BOM into releases by phase or floor and turn each into a PO.
Receiving: check delivery tickets against the BOM line by line.
Job costing: compare what was ordered against the budget for each cost code.
Change orders: a revised BOM backs up the material portion of a change price.
Common BOM mistakes
Using one waste factor for everything. Waste on sheet goods, trim, and pipe is very different.
Missing small items: fasteners, adhesives, blocking, flashing. They add up.
Not updating the BOM after an addendum or RFI answer changes a spec.
Ordering everything at once, so material sits on site and gets damaged or stolen.
Listing generic descriptions where the spec requires a named product or approved equal.
What is the difference between a takeoff and a bill of materials?+
A takeoff measures quantities from plans. A BOM converts those quantities into specific orderable products with sizes, specs, and waste.
Who makes the BOM on a construction job?+
Often the estimator at bid time, then the PM, foreman, or supplier refines it for ordering. Suppliers frequently produce BOMs for framing and lumber packages.
Should a BOM include labor?+
No. A BOM is materials only. Labor hours are estimated separately, though they are often based on the same quantities.
How much waste should a BOM include?+
It depends on the material, the layout, and the crew. Use your own job history by material type rather than a single flat percentage.
A NASDAQ-listed consolidator, Construction Partners (ROAD), is quietly buying the local asphalt and paving contractors across Sunbelt metros — GMJ Paving in Houston, Four Star Paving in Nashville — while posting 44% revenue growth. We break down what changes for the independent contractor-owner when a public roll-up enters your market: pricing power, talent gravity, materials integration, and what it means for your own exit options.
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Read the full episode transcript
Published transcript from Scaling Legends. It may contain transcription errors. View the source transcript.
As always this content is for educational and informational purposes only. It is not legal, financial, or professional advice. Welcome to another deep dive edition of Scaling Legends, the construction industry podcast specifically designed for you, the contractor owner. Before we get into it, I just want to mention that we are currently accepting beta testers for Smart Business Automator. Right. And it's worth noting that beta testers actually get first access to new features and updates before the public rollout, which is a huge advantage. Yeah, exactly. So you can sign up for that right now at smartbusinessautomator .teto88 .com. So let's jump in. One NASDAQ -listed company grew revenue 44 % in a year, largely by buying up the local paving contractors in your market, one metro at a time. And, you know,
our goal for this deep dive is to really unpack the mechanics behind that massive number. We are looking at the ongoing wave of sunbelt, asphalt, and paving roll -ups. And I want to be really clear right from the jump. This isn't just breaking news about a single deal. This is a massive ongoing trend that's fundamentally altering the competitive landscape for independent contractor owners like you. I mean, let's be real, growing 44 % in a 12 -month window in the heavy civil and paving space, that's just aggressive. You don't hit that kind of scale by, I don't know, winning a few extra municipal bids or doing a couple more commercial parking lots. No, absolutely not. So, like, who is the player executing this? And what do the underlying financials actually look like? So, the company driving a lot of this
consolidation is Construction Partners. And they're traded on the NASDAQ under the ticker ROAD. And to give you the precise scope of what they're doing, I'm actually pulling this data specifically from Smart Business Automator's Market Intelligence Report. Okay, what are we looking at? Looking at their queue. 2021 FY2026 financials, they posted a staggering $809 .5 million in revenue. Oh, wow. Right. That's up 44 .1 % year over year. And even more importantly, they swung from a previous loss straight to $17 .2 million in net income. Wait, seriously? That's a near half billion dollar revenue jump. Yeah, it's massive. So... Let's break down how they're achieving that, because, I mean, they aren't just putting more boots on the ground, right? It feels almost like they're playing a real -life game of Monopoly.
Like, they're just quietly buying up all the utilities and railroads and the Sunbelt before the other players even notice the board has changed. That is exactly what's happening. The growth is fueled by these really strategic... Metro by Metro acquisitions. But if these acquisitions are happening right under the noses of local markets, how exactly are they pulling this off without disrupting the local customer base? Well, their lack of disruption is highly intentional. It's really the core of the specific corporate playbook they use. Let me give you two recent examples from early 2026. So in February, they acquired GMJ Paving down in Houston. And then just a couple of months later in April, they picked up four -star paving over in Nashville. Okay, so they're moving fast. Very fast. And they use a platform roll -up template. So when
Rode acquires a shop like four -star paving, they fold it into an existing platform, like pavement restoration. Oh, nice. And when they bought GMJ Paving, it went into the Derwood Green platform. But here's the kicker. To the outside world, absolutely nothing changes. They keep the original brand and they keep the crew. They simply plug in their own massive corporate back office. Wait, hang on. If everything looks exactly the same to the customer, like same truck, same logo, same guys pouring the asphalt on a Tuesday, what is actually changing behind the scenes that justifies these massive corporate acquisitions? What's the real advantage here? The real advantage is scale and more specifically, control over raw materials. That's what changes the fundamental economics of local paving. Control over the materials,
like the asphalt itself. Exactly. Let's look at that Houston market example again. When GMJ Paving was acquired, it didn't just become part of a portfolio. It became Rhodes' 12th Houston area plant. 12 asphalt plants in one single metro area. Okay, pause. Because if you're an independent owner listening right now, that is a terrifying reality. It absolutely is. And here's why it mattered to the listener. When a single buyer owns 12 asphalt plants in your specific metro area, they achieve complete vertical materials integration. Which means? It completely alters the bid math for every independent contractor in that region because the consolidator now controls the supply chain. You're basically bidding against the guy who makes the rules and owns the raw
materials. Precisely. So if you're an independent contractor, how do you even survive that kind of margin compression when the deck is just stacked against you from the jump? Well, margin compression is a huge issue. But independent owners aren't just at risk of losing bids. They are at risk of losing their people. Ah, the guys in the field. Right. We have to talk about talent gravity, basically the war for the crew. Because roll -ups aren't just buying plans and heavy machinery. They are buying experienced crews. And in this industry, with the labor shortage, that's everything. Exactly. Acquiring an intact functioning team is incredibly valuable right now. So the listener really needs to understand this retention imperative. Which means what exactly? It means when a well -funded, publicly traded company comes to town
with... You know, corporate benefits and deep pockets. Independent shops are highly vulnerable. Independents must have a rock solid retention story to hold onto their bench. But I mean, if it's essentially a corporate giant raiding your roster, how does a local contractor owner build a moat around their best operators to keep them from jumping ship? You can't outspend Nasdaq, you. No, you can't outspend them. But building a moat, or honestly, making your own business attractive enough to be bought out by them, requires looking at how your business is fundamentally structured and documented. Structure in terms of the books. Yeah, we're talking about valuation benchmarks and operational legibility. Because this trend means something very specific for contractor owners who might be thinking about their eventual exit or succession. Oh, because
they're seeing real -world payouts. Exactly. Because a live repeat acquirer is actively paying real multiples in the market, it gives independent owners a highly accurate valuation benchmark. Right. So you actually know what your company is worth on paper. Right. But it all comes down to... It's acquireability versus defensibility. Whether you want to build a moat to defend against the roll -ups or you want to make your book highly acquirable to them, you need operational legibility. Okay. What does operational legibility actually mean in this context? It means having clean job costing and thoroughly documented systems. Right. Because, you know, relying on gut instinct for estimating and job costing might work when you're a small, scrappy operation, right? Sure. It works
for a while. But you can't sell a gut instinct to a NASDAQ you acquire. No, you absolutely cannot. And honestly, this is exactly why our tool set exists. It's why we always talk about Smart Business Automator to create that exact operational legibility. And you have to translate your business into a language the big guys understand, right? Yes. 100%. If your operations aren't legible, you can't defend your margins, and you certainly can't command a premium if you decide to sell. So just to recap the whole deep dive for the listener today, the Sunbelt Taving Roll -Up is completely changing local bid math. It is. It's turning skilled crews into the ultimate acquisition target. And ultimately, it's forcing independent contractor owners to get their operational houses in order. That's the core takeaway. Yeah. Well,
I want to remind you all one last time that you can gain an edge by... becoming a beta tester at smartbusinessautomator .com to get early access to tools that build that operational legibility. And to wrap things up, I want to leave you with one final lingering question to ponder. If a public consolidator were to secretly look at your books and your crew today, what would they see? Would they see a formidable, structurally sound competitor they have to acquire, or just an unorganized shop that can easily outbid and slowly bleed of talent?
