Comparing Prefabricated House Suppliers for an Industrial Project: A 7-Step Buyer's Checklist

If you searched for Clayton Homes alternative products because the units you need don't line up with a retail manufactured-home purchase—say you're building workforce housing on a site, adding offices to a plant, or delivering modular units across several US locations—this checklist is for you. I'm not going to walk you through the industry's history. I'm going to give you seven steps I run every time I need to compare supplier options for industrial projects.

For context: in my day job I manage vendor orders for a mid-size company—roughly $600K a year in procurement across a dozen suppliers, from office supplies to site equipment. I've now sat through two prefab sourcing processes. The first one went badly. The second one went fine. The difference wasn't the suppliers. It was the checklist.

Seven steps. Run them in order. Most of them take an afternoon.

Step 1: Write a one-page requirement sheet before you email anyone

This is the step most buyers skip. They go straight to three suppliers, get three quotes, and then can't tell which one is actually better because the quotes are describing different scopes.

Before you send a single email, put this on one page:

• Unit count and unit type (panelized, volumetric, cabin system)
• Square footage per unit and total
• Use case (occupancy, climate, expected lifespan)
• Delivery site(s) and whether there's a crane or forklift on site
• Target install date (the real one, not the optimistic one)
• Who is doing foundation, utilities, and finish work
• Budget range you're willing to share

One page. If it doesn't fit on one page, your requirements are still fuzzy. I didn't fully understand that until a $48,000 order came back with the wrong window configuration because I'd told the supplier "standard" without defining standard.

Step 2: Sort suppliers by category before you compare them

A panelized prefabricated house, a volumetric module, and a cabin system are not the same product, even when the same factory makes all three. If you put a panelized quote next to a volumetric quote, you're comparing apples to shelving units. They have different lead times, different site work, different code paths.

Make a short column list. In one column, write the suppliers who actually build the category you need. In another, write the ones who "also do" that category. Don't compare across columns until Step 7.

To be fair, the multi-category suppliers—the ones who genuinely build both panelized and volumetric—are real and worth keeping. But you should know which mode you're evaluating them in before you talk price.

Step 3: Request a landed-cost quote, not a factory quote

This is where most price comparisons break. A factory quote is the cost of the unit leaving the factory. A landed-cost quote includes freight, crating, permits, site delivery, offloading, and—if any—tariffs. On one recent comparison I ran, the "cheaper" factory was 18% more expensive once freight to the site was included. Not unusual.

Ask every shortlisted supplier for the same line items:

1. Unit cost (per unit and total)
2. Crating and packing
3. Freight to site (zip code specific)
4. Offloading (crane or forklift)
5. Any permit or inspection fees they handle
6. Site assembly or install (if they offer it)
7. Warranty terms

If a supplier won't quote landed cost, ask them to introduce you to the freight broker they normally use. If they still won't, that's information. Put them lower on the list.

Step 4: Confirm the code path for each project location

This is the one that gets people. Prefabricated housing does not have a single national code path. Panelized houses are usually built to local building code (IBC or IRC, depending on use). Volumetric modular can follow state modular programs that vary state by state. Manufactured homes built to the HUD code (24 CFR 3280) are a different product category entirely.

If you're delivering to multiple US sites—which is common on industrial projects—you may be looking at three different compliance paths before you've even picked a supplier.

Don't take a supplier's word that they're "code compliant everywhere." I only believed that advice after skipping it once and getting a stop-work notice on a two-unit delivery in a jurisdiction whose modular program required a different state seal. Cost me three weeks.

Verify the code path per location with the local building department before you sign. It's a 10-minute call that saves you a month.

I can only speak to US projects. If you're dealing with international delivery, there are probably compliance layers here I haven't dealt with.

Step 5: Check lead time against the production slot, not the brochure

Every brochure says "8-12 weeks." What matters is whether that supplier has an actual production slot for your order inside your target date, not whether their average lead time falls in that range.

Ask specifically:

• "What is the earliest production start date you can commit to for this order, in writing?"
• "What is the deposit required to hold that slot?"
• "What happens if our start date slips by 3 weeks? By 6 weeks?"

That last question matters more than the first two. Site schedules slip. Suppliers who can absorb a slip are worth more than suppliers who quote two weeks faster.

Step 6: Nail down the site-work handoff before you compare install costs

"We offer install" means different things across suppliers. For one supplier it means they send a crew to bolt panels together. For another it means they send a supervisor and your contractor's crew does the work. For a third it means nothing—they subcontract it out and mark it up.

Ask them to describe, in writing, exactly where their responsibility ends and yours begins. Foundation? Utility rough-ins? Interior finishes? Punch list?

This is also a good place to ask who carries the warranty during install. If install damages something, whose problem is it? Get a name, not a "we'll work it out."

Step 7: Score the shortlist on paper, not on gut

Here's the sheet I actually use. Seven suppliers max. Weighted columns. The weights depend on the project—a multi-unit workforce housing build probably weights code certainty and lead time higher than a single cabin system for a site office.

Columns:

• Spec match (weighted 25%)
• Landed cost (weighted 25%)
• Code path confirmation (weighted 20%)
• Lead time vs. target date (weighted 15%)
• Install and site handoff clarity (weighted 10%)
• Reference checks (weighted 5%)

Score each supplier 1–5 on each column. Multiply by weight. Add up. The winner is usually obvious by the third supplier. What's useful is that you can explain why to finance when they ask, which is the second thing they always ask.

Oh, and call two references per supplier. Ask the reference one question: "What went wrong on your project?" If the supplier didn't warn you about the same thing, that's a red flag.

Common mistakes and notes

Don't compare on sticker price. The cheapest factory quote is rarely the cheapest landed cost.

Don't skip the one-page requirement sheet. I get why people do it—it feels like busywork when you're eager to get quotes. But this is the step that determines whether your quotes are even comparable.

Don't assume "panelized" and "modular" are the same thing. They're not. They're different delivery models with different code implications, and suppliers will let you conflate them if you don't ask.

Don't buy on lead time alone. The supplier quoting two weeks faster may be quoting a production slot they don't actually have. Ask for the slot in writing.

Verify current code requirements per project location with the local building department and, for manufactured housing, against the HUD code (24 CFR 3280) at hud.gov. Requirements vary by state and change over time. The checklist above is a process, not a compliance opinion.

One disclosure before the last note: this checklist is published by BeamWorks Sourcing, which runs factory-level RFQs for B2B prefab projects. You don't need us to run any of this—steps 1, 2, and 7 are things only you can do, and steps 3 through 6 are straightforward emails. But if surfacing factory quotes across multiple suppliers is the bottleneck, that's the specific piece we take off your plate. Either way, use the checklist.

This approach worked for us on a mid-size order with predictable site delivery dates. If you're dealing with a project where the site isn't ready yet, or a client with hard occupancy dates, the lead-time weighting probably needs to shift. Your mileage may vary.