Before you sign a modular-home contract, confirm the home’s legal classification, the destination jurisdiction’s approval path, every permit and inspection, the site and foundation assumptions, each party’s installation duties, and the warranty service process. A factory-approved module is only one part of a permitted house: local foundations, grading, utilities, access, and site-built work still have to be designed, priced, inspected, and accepted for the specific property.
Start with the exact destination address. Rules vary by municipality, state or province, adopted building code, soil conditions, utility arrangements, and whether the home is treated as modular or HUD-code manufactured housing. Use the checklist below before paying a nonrefundable deposit.
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1. Confirm what kind of factory-built home you are buying
Do not assume that every factory-built house follows the same rules. A modular home is generally built to the building codes and specifications that apply at its intended placement location. A HUD-code manufactured home follows the federal HUD Code and its related installation requirements. The distinction affects the approval documents, labels, inspections, foundation design, installation rules, warranty expectations, and dispute processes.
Ask the supplier for the code basis
- The written classification of the home: modular, industrialized, manufactured, or another category used by your jurisdiction.
- The building-code edition and state or provincial requirements used for design and construction.
- State approval, insignia, label, or registration information where the jurisdiction requires it.
- Approved architectural, structural, mechanical, electrical, energy, and foundation drawings.
- The name of the agency that approves the factory work and the authority that approves the site work.
- Any engineering calculations, snow, wind, seismic, flood, or energy documentation required for your address.
HUD materials explain that modular homes are built to the codes and specifications for the placement location rather than the HUD Code. That description does not eliminate local zoning, permit, foundation, grading, utility, or inspection requirements. State approval and labeling arrangements, including arrangements described by HUD as Category III systems, are an overview of possible processes—not a determination that a particular home is approved for your site.
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Verify the classification independently
Send the supplier’s documents to the destination building department and, where applicable, the state modular or industrialized-housing regulator. Ask the officials to confirm which agency reviews the factory plans, which agency reviews the property-specific plans, and what label or inspection record must accompany delivery. Obtain the answer in writing or retain the applicable code and permit correspondence in your project file.
| Question | Why it matters | Evidence to retain |
|---|---|---|
| Is the home modular or HUD-code manufactured? | Different regulatory and installation paths may apply. | Supplier classification and agency confirmation |
| Which code edition governs? | Plans, energy calculations, and inspections must match the adopted edition. | Code statement and approved drawings |
| Who approves factory construction? | Factory approval is separate from site approval in many systems. | State approval, label, or inspection documents |
| Who approves the property? | The local authority may control zoning, foundation, grading, utilities, and final occupancy. | Permit instructions and contact details |
2. Identify every permit before ordering
Ask for a permit list tied to your address, not a generic statement that “the home is code compliant.” The destination jurisdiction determines which applications are required, who files them, what drawings are submitted, and when inspections occur.
Use a written permit matrix
| Permit or approval | Questions to ask | Typical supporting information |
|---|---|---|
| Building permit | Does the modular package need a local building permit? Is a separate permit required for site-built portions? | Approved module drawings, site plan, code summary, structural documents |
| Foundation or structural permit | Who designs and permits the foundation, basement, crawlspace, piers, anchors, and connections? | Site-specific foundation plan, soil information, engineering and connection details |
| Grading and drainage | Is land disturbance, excavation, stormwater control, or a drainage plan regulated? | Grading plan, drainage details, erosion-control measures |
| Utility approvals | Who obtains approvals for water, sewer, septic, electrical, gas, communications, and temporary services? | Utility layouts, service applications, septic design, equipment schedules |
| Driveway and access | Is a driveway, road opening, culvert, or access permit needed for delivery and emergency access? | Access plan, sight-distance information, road authority approval |
| Septic or well | Does the health or environmental authority approve the system before the building permit? | Percolation results, septic design, well location and setbacks |
| Inspections and occupancy | Which inspections occur before setting, after joining modules, before concealment, and before occupancy? | Inspection schedule, sign-off forms, occupancy or completion certificate |
Clarify who applies and who pays
For every permit, record the applicant, fee payer, drawing preparer, submission date, inspection requester, and person responsible for responding to corrections. A supplier may provide drawings without filing the application. A general contractor may obtain the building permit while a septic contractor handles the health approval. Your contract should reflect those boundaries rather than relying on a sales conversation.
Texas guidance specifically calls out approved plans, including foundation plans, as part of permitting. Ontario guidance notes that both factory-built modules and work that cannot be completed in the factory—such as the foundation, basement, site preparation, or grading—may need to be covered by a building permit. These examples show the questions to raise; they are not nationwide rules. Confirm the requirements with your own authority having jurisdiction.
Do not order on an unverified assumption
Before the cancellation period or deposit deadline, ask the building office whether the proposed home can be placed on the parcel under current zoning, setbacks, lot coverage, height, appearance, flood, fire-access, and utility rules. Planning approval and building approval may be separate. A home that meets construction requirements can still be unsuitable for a lot if zoning, access, septic setbacks, or flood restrictions prevent placement.
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3. Test the site against the delivery and foundation plan
Site preparation is not a minor finishing task. It determines whether modules can reach the property, whether the foundation can support the design, whether water drains away from the structure, and whether the completed house can pass inspection.
Map the delivery route
- Measure the route from the factory or transfer point to the property, including bridge limits, low clearances, narrow lanes, steep grades, weight restrictions, and seasonal road closures.
- Identify the turning radius needed by the transport equipment and the space required for staging modules before the crane arrives.
- Check overhead wires, trees, signs, street furniture, fences, retaining walls, and neighboring property boundaries.
- Confirm whether traffic control, police detail, temporary road closures, permits, or utility-line lifting are required.
- Obtain written permission for any use of neighboring land and define who pays for temporary access work and restoration.
Have the installer or transport company inspect the route rather than relying solely on a satellite image. A route that looks adequate for a car may not accommodate a long module, escort vehicles, a crane, or a delivery during wet weather.
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Ask what soil bearing capacity, frost depth, groundwater level, slope, seismic condition, and flood elevation the foundation design assumes. If the supplier’s standard foundation is based on assumptions that do not match the property, obtain site-specific engineering before construction. Determine where excavated soil goes, how surface water is diverted during construction, and how final grades will shed water away from the foundation.
HUD’s manufactured-home homeowner checklist emphasizes site access, stable soil, a proper foundation and anchoring, and drainage away from the foundation. Those are useful investigation points for any factory-built project, but HUD manufactured-home guidance should not be treated as a modular-home code for every jurisdiction. HUD’s concise guidance is: “Site selection is critical to the performance of your home.”
Define foundation and basement work
Determine whether the contract includes excavation, footings, walls, slabs, piers, crawlspace or basement construction, waterproofing, insulation, anchors, hold-downs, drainage tile, sump equipment, backfill, and final grading. Ask who supplies the structural connection details between the modules and the foundation, who installs them, and who signs the inspection documents.
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If a basement or crawlspace is site-built, confirm that its dimensions, openings, stairs, egress, fire separation, insulation, and mechanical penetrations match the factory modules. A foundation that is merely “ready” may still lack anchor hardware, embedded plates, utility sleeves, or a level tolerance required for setting.
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Locate water, sewer or septic, electrical, gas, communications, HVAC equipment, meters, service disconnects, and exterior condensate or drainage lines on the site plan. Establish who trenches, supplies conduits and sleeves, makes final connections, obtains utility releases, and repairs damage to public or private infrastructure. Coordinate stub-out locations with the approved module drawings; changing them after delivery can require concealed rework and additional inspections.
4. Put every handoff and exclusion in the contract
Factory-built projects fail financially when responsibilities are described as “standard installation” without defining what that phrase includes. Require a line-item scope that follows the project from factory gate to occupancy.
| Work item | Contract language should identify |
|---|---|
| Transport | Route planning, permits, escorts, delivery dates, weather delays, and responsibility for road or property damage |
| Unloading and crane work | Crane size, setup pad, lifting plan, rigging, operator, waiting time, and standby charges |
| Foundation | Design, excavation, concrete or piers, anchors, waterproofing, drainage, backfill, and inspection |
| Setting and joining | Module placement, fastening, structural connections, roof and wall marriage lines, seals, flashing, and weatherproofing |
| Interior and exterior completion | Finish carpentry, siding, roofing repairs, stairs, decks, porches, skirting where applicable, painting, and cleanup |
| Utilities | Trenching, service equipment, meters, hookups, testing, startup, and utility-company fees |
| Permits and inspections | Applications, fees, scheduling, correction responses, reinspection charges, and occupancy documentation |
| Damage and repairs | Who documents delivery damage, performs repairs, pays for hidden damage, and handles claims between trades |
Separate included work from allowances
An allowance is not the same as a completed scope. Ask whether an amount is a fixed price, a unit price, or an estimate subject to change. Require assumptions for rock excavation, unsuitable soil, long utility runs, retaining walls, tree removal, crane access, winter protection, and permit-driven revisions. If a condition is unknown, define the investigation method and the change-order approval process before work starts.
Coordinate the schedule by dependency
Set milestones for permit issuance, site clearing, foundation completion, utility rough-ins, delivery, crane setup, module setting, weatherproofing, interior completion, inspections, testing, and occupancy. State what happens if a permit, inspection, utility release, road closure, or weather event delays a milestone. Do not allow a delivery date to be fixed before the foundation and access conditions are confirmed.
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5. Understand inspections and acceptance
Ask the building department and installer for an inspection sequence. Some authorities inspect the foundation before concrete or concealment, require a setting or connection inspection, and require final inspections after utilities and life-safety systems are complete. The factory’s quality-control records do not replace a local inspection unless the jurisdiction expressly says they do.
Keep a project record
- Approved plans and revisions, including the foundation and site plans.
- Permit cards, inspection reports, correction notices, and final approvals.
- Delivery photographs showing module condition before unloading and after setting.
- Weatherproofing, connection, utility, pressure, electrical, and startup records.
- Change orders identifying price, schedule effect, and the approving parties.
- Names and contact details for the factory, installer, general contractor, engineer, and warranty administrator.
Before accepting the home, walk each room and exterior elevation with the contract, plans, and a written punch list. Record incomplete work, water entry, damaged finishes, misaligned doors or windows, missing trim, mechanical defects, and utility or drainage problems. Specify who corrects each item and whether payment or occupancy is conditional on completion.
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Ask for the complete warranty booklet and any installation, foundation, appliance, system, or state warranty-plan documents before you commit. A brochure or verbal promise is not a substitute for the terms that control a claim.
Extract the terms into a warranty summary
| Term to record | What to verify |
|---|---|
| Provider | Legal name, address, claims portal or phone number, and whether the factory, seller, installer, or another administrator handles the claim |
| Start date | Delivery, substantial completion, occupancy, registration, or another stated trigger |
| Duration | Length of coverage and whether different components have different periods |
| Covered work | Structural members, roof, exterior envelope, plumbing, electrical, HVAC, finishes, appliances, and installation labor |
| Exclusions | Normal wear, owner maintenance, landscaping, site drainage, movement, unauthorized alterations, weather events, or damage caused by another contractor |
| Claim deadline | Notice period, documentation required, and whether late notice can reduce or bar coverage |
| Labor and travel | Whether diagnosis, labor, mileage, lodging, equipment, removal, and replacement are included |
| Preservation duties | Required maintenance, inspections, registration, approved installers, or immediate mitigation of damage |
| Remedy and escalation | Repair, replacement, reimbursement, mediation, arbitration, regulator complaint, or court process |
Separate factory, installer, appliance, and legal protections
One warranty may cover factory components while another covers setting, joining, foundation, or site work. Appliances and mechanical equipment may have their own manufacturer terms. Ask which document controls a defect at an interface—for example, a leak at a roof marriage line, a plumbing connection, or a foundation-to-module attachment.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchHUD states that a manufacturer warranty is not federally required for manufactured homes and is separate from HUD standards and HUD dispute resolution. Do not transfer that rule automatically to modular homes. Warranty rights, statutory protections, registration duties, and dispute procedures depend on the home type and location. Ontario guidance recommends checking warranty-plan eligibility for a modular project; buyers elsewhere should ask the relevant local warranty or consumer-protection authority the equivalent question.
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Protect the claim process
- Register the home and appliances if the warranty requires registration.
- Keep the closing statement, serial or module identification, plans, permits, inspection approvals, and paid invoices together.
- Report leaks, electrical hazards, structural movement, or unsafe conditions promptly and take reasonable steps to prevent additional damage.
- Use the required service contact and obtain a claim number or written acknowledgment.
- Do not authorize a permanent repair that could void coverage unless the warranty administrator or an emergency-safety exception allows it.
- Escalate unresolved claims using the procedure stated in the warranty and applicable local law.
7. Compare proposals on an identical scope
The lowest factory price is not necessarily the lowest completed-project price. Compare written proposals only after normalizing what each one includes.
| Comparison axis | What to place side by side |
|---|---|
| Approval path | Code basis, state approval, labels, approved drawings, and responsibility for revisions |
| Site work | Clearing, excavation, grading, drainage, soil treatment, foundation, basement or crawlspace, and restoration |
| Delivery and setting | Transport, permits, crane, rigging, staging, module joining, weatherproofing, and damage responsibility |
| Utilities | Trenching, service upgrades, hookups, meters, testing, septic or well work, and utility fees |
| Inspections | Applications, scheduling, correction work, reinspection charges, and final occupancy documents |
| Schedule | Lead time, permit dependencies, site-readiness deadline, weather allowances, and delay responsibility |
| Exclusions | Rock, unsuitable soil, long runs, retaining walls, access improvements, landscaping, decks, appliances, and cleanup |
| Warranty | Provider, start date, duration, covered interfaces, exclusions, labor or travel, and claim escalation |
| Defect ownership | Named party for factory defects, transport damage, installation defects, foundation movement, utility failures, and delays |
These comparison axes come from the practical responsibilities that must be coordinated among the factory, installer, contractors, and authorities. They are not a performance ranking of suppliers. Ask each bidder to mark an item “included,” “excluded,” “allowance,” or “not applicable,” and to identify the assumption supporting the answer.
8. A pre-order decision sequence
- Choose the exact parcel. Confirm ownership, zoning, setbacks, access, utilities, flood or environmental constraints, and the authority having jurisdiction.
- Classify the home. Obtain the code basis, approval or label information, approved drawings, and regulator contacts.
- Request the jurisdictional permit list. Include building, foundation, grading, drainage, utility, driveway, septic or well, and occupancy approvals.
- Commission site checks. Verify route access, crane setup, soil, slope, drainage, groundwater, frost or seismic assumptions, and foundation requirements.
- Define the scope. Assign every transport, site, foundation, installation, utility, inspection, cleanup, and repair task to a named party.
- Compare normalized proposals. Make exclusions, allowances, schedule dependencies, and change-order rules visible.
- Review warranties and remedies. Record provider, coverage, start date, exclusions, claim deadlines, labor, travel, and escalation.
- Make the deposit conditional where possible. Tie ordering to satisfactory zoning, permit feasibility, site investigation, financing, and document review, subject to advice from your lawyer and local professionals.
- Release construction in stages. Require approved plans, permitted work, foundation acceptance, delivery inspection, setting records, final inspections, and occupancy documentation.
9. Red flags that require a pause
- The seller cannot state whether the home is modular or HUD-code manufactured.
- You are told that factory approval automatically replaces local permits.
- No one will identify the authority responsible for foundation or site approval.
- The proposal says “set and finish” without listing transport, crane, weatherproofing, utilities, inspections, or cleanup.
- The foundation price is based on an unverified standard detail despite unknown soil, slope, flood, or frost conditions.
- The delivery route has not been physically checked for clearance, turning, staging, or crane access.
- Warranty terms are promised verbally but the actual document is unavailable before signing.
- Separate contractors are expected to resolve interface defects without a written responsibility matrix.
- Payment is requested before permits, approved plans, or site-readiness conditions are established.
When a red flag appears, pause the order and request a written answer, revised drawing, site investigation, or contract clause. If the answer depends on a code interpretation, ask the authority having jurisdiction rather than relying on a sales representative’s interpretation.
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10. Final document checklist
Before signing, place these items in one project file and make sure names, addresses, module identifiers, and revision dates agree:
- Purchase agreement and complete specifications.
- Home classification and code-basis statement.
- State or provincial approval, label, or registration documents where applicable.
- Approved module, structural, energy, foundation, site, grading, drainage, and utility plans.
- Written permit matrix with applicants, fees, inspections, and final-approval requirements.
- Site access and crane plan, including temporary work and restoration.
- Soil, foundation, drainage, septic, well, flood, or other site-specific reports.
- Scope-of-work and responsibility matrix for factory, transport company, installer, contractors, and owner.
- Schedule with permit and site-readiness dependencies.
- Change-order, delay, damage, and dispute procedures.
- Warranty documents, registration instructions, service contacts, exclusions, and claim deadlines.
- Payment schedule tied to measurable milestones and accepted work.
A modular home can simplify some construction, but it does not remove the need for property-specific planning. The safe purchase is the one in which the classification is confirmed, permits are identified before ordering, the site and foundation are engineered for the parcel, every handoff is priced in writing, inspections are scheduled, and warranty responsibility is clear.
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