A modular builder has three risk identities at the same time. In the plant it is a manufacturer. On the road it is a shipper of one of the most valuable single objects a small company ever moves. On the site it is a contractor, working at height with a crane. Almost every program we read covers the first one properly, the third one partially, and the second one by accident.
Factory-built construction is one of the few genuinely growing manufacturing categories in South Georgia — classroom buildings, workforce and disaster housing, healthcare pods, quick-turn commercial space. The plants are typically in small towns, they are frequently the largest private employer within twenty miles, and their premiums are large enough that the program deserves an actual reading rather than a renewal.
The trouble is that the standard submission treats the business as a wood-products factory. That is one third of it. This page covers the other two thirds, and the seams between them — because in this trade the losses live in the seams, not inside any one policy.
| Identity | Where it lives | What actually drives it |
|---|---|---|
| Manufacturer | Plant comp, property, equipment breakdown, products liability | Payroll and units shipped. Ground-level, fixed-machinery work — the rate is mid-range, not high. |
| Shipper | Inland marine transit, motor truck cargo, commercial auto | Value per loaded unit, oversize permits, escorts, and who bears risk of loss at each stage. |
| Contractor | Field comp, GL ongoing operations, crane and rigging, umbrella | Work at height, the crane arrangement, and public exposure on school and hospital property. |
Five variables move the whole number: units per year and average value per unit; whether the company sets its own modules or sells free-on-board the plant; the end-use mix (residential, classroom, healthcare, commercial, disaster housing); the maximum work height and crane arrangement at set; and the losses read claim by claim, with plant, transit and set events kept separate.
This is the single most valuable hour a modular manufacturer can spend, and it is not an insurance question first — it is a contract question. A finished module on a lowboy under an oversize permit can fall into any of four places:
Two further points. Coverage for over-the-road transit is not the same as coverage for loading, unloading, temporary storage and the set — confirm each stage explicitly. And check the covered-auto symbols and hired/non-owned wording if you use company tractors, contract haulers or escort vehicles; the symbols page covers how that reads.
A manufacturing classification describes work at your own premises. The moment a crew drives to a customer site to receive, crane, land, marry, weld, seal, roof and finish the modules, that crew is doing construction — separately classified, at a materially higher rate. Same for warranty and service crews returning to completed buildings.
Three consequences, in ascending order of seriousness:
At the set itself, the crane arrangement decides which policy responds: owned, rented bare, or rented with an operator are three different answers. Rented-with-operator raises borrowed-servant and contractual questions; rented bare puts the machine on your contractors' equipment coverage and the operation on your GL. A suspended module is also the textbook care, custody and control problem — property of another in your control, which standard GL forms address by exclusion.
Under a standard GL form the products and completed operations hazard picks up injury and damage arising out of your product once it has left your premises and your physical possession — and it carries its own separate aggregate. So a manufacturing defect found after delivery is a products claim; a bystander injured during the set is an ongoing-operations claim under the general aggregate. Three difficulties follow.
Damage-to-your-work and damage-to-your-product exclusions mean repairing or replacing the unit is normally your own cost. What the policy answers for is resulting damage to other property — in this trade, almost always water: a failed marriage-line seal or roof detail damaging interiors, contents, equipment and finishes inside the building.
Buildings are occupied for decades. Framing, moisture-control and mechanical defects surface years out. That tail is a live reason not to lapse coverage after exiting a product line, and a reason to read how any new carrier's form treats prior work. If you're weighing form triggers, the occurrence vs. claims-made page covers the mechanics.
Factory-built buildings are generally regulated under a state industrialized or modular building program — or under the federal manufactured-housing standard for units built to it. The mechanism is that the building is inspected and labeled at the plant by a third-party inspection agency, a state approval or insignia is affixed, and local jurisdictions then accept the building without inspecting concealed work.
That is efficient, and it moves risk onto the manufacturer in three specific ways:
Program requirements, approved-design procedures, inspection-agency roles and label rules are set by state statute and by state and federal administrative authority and are amended — confirm with the relevant agency and qualified counsel.
Unlike a site builder whose exposure is spread across many jobs, a modular plant stacks the building, the line, raw stock and high-value work-in-process under one roof. One fire or one severe-weather event reaches all of it. Four renewal items:
One easy miss: finished units sitting in the yard awaiting shipment. Some property forms treat property in the open differently from property in a building. Confirm it rather than assume it. Plant-floor parallels are covered further on the manufacturing plant page.
I'll read the transit clause, the class split and the products tail against what your plant actually does — no charge, no obligation.
Get a free risk review →If you also do site work, foundations or utilities ahead of the set, the civil contracting and excavation pages cover that side. If your contracts require bid, performance or payment bonds on public and school work, BettrBonds handles the surety.
There's no single rate, because you're priced as three businesses sharing an owner. The plant rates as manufacturing — payroll for comp, generally sales or receipts for products — in the middle of the wood and light-metal fabrication range, because the work is at ground level under a roof on fixed machinery. The set crew rates as construction, materially higher, and unsupported splits default to the highest applicable class. Transit and unit values drive an inland marine and property number often larger than either liability line. Five variables move it: units and value per unit; whether you set or sell FOB plant; the end-use mix; work height and the crane arrangement; and losses read claim by claim. Rates and rules are set by the applicable rating bureau and state authority and are amended — confirm with your carrier.
Whoever the contract says — and the contract is usually the part nobody read. Four possible homes: your inland marine transit, the hauler's motor truck cargo (subject to their limit and released-value terms, routinely far below unit value), the buyer's builder's risk if written broadly enough to reach transit and off-site storage, or nowhere. The controlling document is the risk-of-loss and title-transfer term in the purchase agreement. The worst common version is a contract reading FOB plant while the manufacturer still arranges and pays for the haul — operational control without insurable interest. Confirm limits against actual loaded value, and confirm the coverage reaches loading, unloading, temporary storage and the set, which are separate perils from over-the-road transit.
Generally not — this is the most common classification error in the trade. Manufacturing classes describe work at your own premises. A crew that travels to receive, crane, land, marry, weld, seal and finish modules is doing construction, separately classified at a higher rate, and the same goes for warranty crews. Three consequences: unsupported splits default to the highest applicable class at audit; a carrier that underwrote a factory may not have accepted a crane-at-height exposure on school property; and crews crossing state lines raise which-state-applies questions answered by the policy's state schedule and other-states provision, where an unlisted state is a genuine gap.
Both, and the split runs down the middle of the GL form. Products and completed operations picks up injury and damage from your product once it has left your possession, under its own separate aggregate; injury during the set is ongoing operations under the general aggregate. Three difficulties: the module itself is excluded as your work or your product, so what the policy answers for is resulting damage to other property — usually water inside the finished building; claims arrive years late, which makes lapsing coverage or changing carriers without checking prior-work treatment a live exposure; and there is normally no coverage to inspect, retrofit or recall units that have not yet failed, which is precisely the modular scenario since one design defect is replicated across the whole run. Recall and withdrawal are separate purchases.
They turn a construction question into a certification question, and certifications are warranties. The building is inspected and labeled at the plant by a third-party agency, a state insignia is affixed, and local jurisdictions accept it without inspecting concealed work. So conformance to the approved design and code edition is a representation, and breach of warranty and contract are ordinarily excluded from GL — that gap is what professional liability, products extensions and E&O address. In-house engineering is professional services, commonly excluded from GL outright. And because an approval attaches to a design rather than a unit, a design defect reaches every unit built to it. Program rules are set by state and federal authority and are amended — confirm with the agency and counsel.
Concentration and swing. Building, line, raw stock and high-value WIP sit under one roof, so one event reaches everything. Work-in-process is hard to value — selling price, cost to reproduce or ACV decides what you recover. Values swing with backlog, which is what peak-season and reporting-form provisions exist for. BI on a single line is a period-of-restoration problem governed by machinery lead time, not by rebuild speed, and machinery failure is equipment breakdown rather than fire. Dependence on a few suppliers for framing packages, windows or mechanicals is contingent BI, frequently not purchased. And confirm that finished units in the yard are covered — some forms treat property in the open differently.
A submission that separates the three businesses before they ask. Unit count, average and maximum unit value; end-use mix; whether you set, subcontract or sell FOB plant with the risk-of-loss language attached; payroll split plant versus field with supporting records and every state listed on the comp policy; the transit arrangement naming the hauler, permit and escort practice, cargo limits and released-value terms, and who insures at each stage; the crane arrangement at set — owned, bare rental or with operator; state approvals, inspection agency, approved designs and code editions, and who does the engineering; QC and in-plant inspection records; property values split into building, machinery, raw stock, WIP and finished goods with valuation basis and peak figure; supplier concentration for contingent BI; the vehicle schedule with MVRs; sample contracts showing warranty, indemnity and additional-insured obligations; and three to five years of losses with plant, transit/set and post-delivery defect claims separated.
For general information only. Not legal advice and not a quote or contract of insurance. Policy forms, endorsements, sublimits and exclusions vary by carrier and form edition — damage to your work, damage to your product and impaired property exclusions, products and completed operations aggregates and prior work exclusions, professional services exclusions, care custody and control exclusions, product recall and withdrawal coverage, inland marine transit and property in the open terms, motor truck cargo released value and limitation of liability terms, builder's risk transit and off site storage extensions, covered auto symbols and hired and non owned wording, equipment breakdown and contingent business interruption terms, property valuation clauses including selling price and peak season provisions, and umbrella schedules of underlying insurance must all be read as actually issued. Workers' compensation classification, payroll allocation between manufacturing and construction operations, other states insurance and extraterritorial application, officer inclusion and exclusion, and premium audit rules are set by the applicable rating bureau and state authority; industrialized, modular and manufactured building program approvals, third party inspection agency roles, design approval and label requirements are set by state statute and by state and federal administrative authority; oversize and overweight transport permitting and escort requirements are set by state authority; construction defect obligations, warranty obligations and any statute of repose are set by state statute and case law. All are amended over time — confirm your obligations with the relevant agency and qualified counsel. Coverage subject to policy terms, conditions, exclusions and carrier appetite.