Plan the site around the exact prefabricated building you will install, not around a generic “flat, accessible lot.” Before delivery is booked, confirm local zoning and permits, obtain the manufacturer’s approved foundation and connection details, verify utilities, prove that trucks and cranes can reach and support the work area, and assign every installation and inspection responsibility in writing. Building type, jurisdiction, soil, module dimensions, weather, and lifting equipment can change the requirements, so use qualified local designers, contractors, utility professionals, and crane personnel for project-specific decisions.
1. Define the building and test site feasibility first
A modular classroom, a volumetric house, a panelized office, and a pre-engineered industrial building do not impose the same site requirements. Start with a project brief that both the supplier and local authority can understand.
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Record the project facts
| Project item | What to document | Why it affects site planning |
|---|---|---|
| Building type and occupancy | Residential, commercial, institutional, industrial, temporary, or another use; expected occupants and use of each space | Occupancy determines applicable code reviews, fire protection, accessibility, egress, and utility demand. |
| Module or panel information | Number of units, overall dimensions, shipping dimensions, individual weights, lifting points, and delivery configuration | These figures control transport permits, turning movements, staging space, crane capacity, working radius, and the lift sequence. |
| Property and proposed location | Legal address, boundaries, intended building footprint, orientation, finished-floor elevation, and future expansion areas | Setbacks, easements, drainage, access, and service connections must fit the actual placement. |
| Site constraints | Road width, bridge or culvert limits, grades, trees, walls, neighboring buildings, overhead lines, underground services, water bodies, and restricted work hours | A route or crane setup that looks adequate on a sketch can fail when a trailer must turn or a boom approaches an obstruction. |
| Intended handover | Required completion date, seasonal limits, temporary facilities, and who will occupy or control the property during installation | Inspection bookings, weather protection, traffic control, and utility energization must be sequenced around the handover. |
Ask the manufacturer for its current installation manual, approved drawings, connection details, allowable tolerances, module weights, lifting points, shipping dimensions, temporary bracing requirements, and site-readiness checklist. Treat those documents as design inputs, not as a substitute for local engineering or approval.
Check zoning and permits before committing to site work
Identify the authority having jurisdiction (AHJ) for zoning, building, fire, utilities, road access, and environmental approvals. Ask which submissions are required for the factory-built portions and for work performed on the property. A modular label does not automatically remove local permit obligations.
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Ontario’s guidance says both the factory-built modules and work that occurs on site—such as foundations and grading—must be covered by the building permit. It also advises owners to confirm service access and local requirements before proceeding. Read the Government of Ontario guidance on building a modular house for that jurisdiction-specific process.
San Diego’s process for California-approved modular buildings reviews site placement, setbacks, fire protection, accessibility, foundations, water and sewer, zoning, and plan submissions. Its list is a useful example of the breadth of a site review, but its procedures apply in San Diego and are not universal. See the City of San Diego modular-building permit bulletin.
Oregon likewise explains that substantial foundation and utility work performed at the property can require permits and plan review. The Oregon Building Codes Division Plan Review Guide illustrates why the factory inspection and the site inspection should be planned separately.
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Your site plan should let the AHJ, civil or structural designer, supplier, transporter, crane company, utility contractors, and site crew see the same constraints. Use the local authority’s required scale, symbols, title blocks, and submission format.
Show the physical arrangement
- Property lines, easements, adjacent roads, neighboring structures, and the vicinity map requested by the AHJ.
- Proposed building footprint, orientation, setbacks, finished-floor elevation, entry points, stairs, ramps, decks, and future work that could affect access.
- Existing and proposed contours, drainage paths, retaining structures, clearing limits, erosion controls, and areas requiring fill or compaction.
- Foundation outline, bearing surfaces, anchor locations, crawlspace or basement limits, and any tolerances supplied by the building designer.
- Construction access, trailer route, turning and reversing areas, unloading or staging zone, parking, pedestrian routes, and emergency access.
- Crane position or positions, working radius, tail-swing area, pick path, exclusion zones, outrigger or crawler support areas, and overhead clearance envelope.
- Known underground utilities, tanks, voids, wells, septic components, drainage structures, and overhead lines. Mark locations that have been positively located and identify information that still needs verification.
- Water, sewer, septic, electrical, gas, communications, fire-service, and other connection points, including the proposed route from each point to the building.
Coordinate the drawing set and supporting documents
San Diego identifies a site plan, vicinity map, foundation plans, structural calculations, and a geotechnical investigation report among its submittals. Other jurisdictions may ask for different documents, but the principle is consistent: the building drawings, civil layout, foundation design, utility plans, and lifting arrangement must not contradict one another.
Use a drawing register with revision dates. When the supplier changes a module dimension, connection, finished-floor elevation, or delivery configuration, check every affected sheet before construction. Keep the approved set available to the site supervisor, crane director, inspection staff, and emergency contacts.
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3. Investigate the ground and design the foundation
Use project-specific foundation information
Obtain the supplier’s approved foundation reactions, bearing locations, anchor and tie-down details, minimum elevations, level tolerances, connection clearances, and requirements for temporary support. A qualified structural designer should convert those inputs into a foundation suitable for the actual building and jurisdiction.
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Obtain geotechnical and structural information when required
A geotechnical professional can evaluate soil layers, groundwater, settlement, slope stability, frost susceptibility, expansive or collapsible soils, fill quality, and the need for excavation or improvement. The structural designer uses that information with the building reactions to specify footing sizes, reinforcement, anchors, retaining systems, and construction tolerances. The AHJ may require a signed report and calculations, as San Diego’s submittal example shows.
Before concrete or other foundation work begins, establish benchmarks and verify the building grid. Check excavation limits, reinforcement, anchor-bolt locations, elevations, curing requirements, drainage, and the clearances needed for module connections. Record inspection results and survey the completed foundation so deviations can be corrected before a truck arrives.
Assess the separate ground area used by cranes and placement equipment
The ground that supports a crane, transporter, telehandler, or temporary shoring system is a separate engineering and safety question from the building foundation. Inspect for soft or wet soils, uncontrolled fill, slopes, voids, buried tanks, trenches, culverts, basements, utility lines, and drainage features. Determine the equipment-specific support arrangement with the crane company or operator; do not substitute a generic “tons per square foot” assumption.
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OSHA’s Ground Conditions for Cranes guidance assigns ground-preparation duties to the controlling entity. It states: “The controlling entity must also inform the user and operator of the equipment of hazards beneath the equipment set-up area (such as voids, tanks, utilities) if those hazards are identified in documents (such as site drawings, as-built drawings, and soil analyses) in the possession of the controlling entity (whether at the site or off-site) and of any other hazards known to the controlling entity.” Give the crane team current drawings, survey information, soil reports, and a site briefing, and document any required mats, cribbing, engineered pads, drainage, or stabilization.
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4. Resolve utilities and service connections early
Inventory every required service
List the building’s water, wastewater, septic, electrical, gas, fire-protection, stormwater, communications, and other service needs. For each one, confirm the available point of connection, capacity, pressure or voltage, route length, easements, metering, inspection authority, and expected energization date. A service that is “near the lot” is not necessarily available at the required capacity or elevation.
GSA’s ordering guide for pre-engineered and prefabricated buildings treats immediate installation-area preparation, leveling, clearing, foundations, and utility hookups as potential project scope. Confirm whether each connection is supplied by the building contractor, site contractor, utility company, owner, or another party.
Assign connection responsibilities in writing
| Interface | Decisions to record before delivery |
|---|---|
| Water | Connection point, meter, service size, backflow protection, trench and bedding responsibility, testing, and approval. |
| Wastewater | Municipal connection elevation and invert, pump requirements, cleanouts, inspection, or the engineered septic layout and approval route. |
| Electricity | Utility service, transformer or temporary power, disconnect location, trenching, grounding, energization, and final inspection. |
| Gas or other fuel | Supply authority, regulator or storage location, pipe route, pressure test, ventilation, and commissioning responsibility. |
| Communications and fire services | Conduit or cable entry, network demarcation, fire-alarm or sprinkler connection, testing, and authority sign-off. |
Plan for sites without municipal services
Ontario notes that a site without municipal water and sewer may need a reliable drinking-water arrangement and a septic system, with local approvals potentially required. Confirm well yield or another approved water source, wastewater loading, reserve areas, setbacks, access for maintenance, and seasonal conditions before finalizing the building position. Do not place modules or crane pads where septic tanks, fields, wells, or future service trenches will be inaccessible.
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Prove the delivery route
Have the supplier and transport company review the complete route from the factory or transload point to the property. Check legal load dimensions and weight, bridge and culvert ratings, turning radii, grades, lane widths, traffic restrictions, construction zones, low clearances, sharp bends, and temporary road closures. Obtain oversize-load permits or escorts where the road authority requires them.
Walk or survey the final approach, not just the public road. Confirm gate widths, shoulder strength, tree trimming, fences, ditches, parked vehicles, neighboring driveways, and the point at which a trailer must reverse or uncouple. Establish who will obtain permissions to use private roads and who will restore damaged surfaces.
Design the unloading and staging area
Reserve enough room for the actual trailer combination, safe pedestrian separation, temporary storage, dunnage, weather protection, rigging inspection, and emergency access. Keep the area level, drained, and free of overhead and underground hazards. Define where modules will wait if the crane, inspection, or utility work is delayed; do not improvise a storage location on arrival.
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Develop the lift plan with the crane team
The lift plan should show module weights and centers of gravity, certified lifting points, rigging configuration, crane type and capacity, working radius, boom length, counterweight and outrigger arrangement, pick and set sequence, communication method, wind or weather limits, exclusion zones, and contingency actions. The crane company must verify that its selected equipment can perform every lift at the planned radius and site elevation.
Identify overhead power lines, communication cables, trees, buildings, lighting, and temporary services along the boom and load path. Locate underground utilities, tanks, voids, trenches, and culverts below the crane and transporter positions. Fence or barricade the swing and drop zones, control traffic, brief all workers, and appoint one person to direct the operation.
OSHA explains that prefabricated building sections hoisted for installation can fall under the construction crane standard; do not assume that a delivery or “set” is exempt because the building was manufactured elsewhere. Its Cranes and Derricks in Construction FAQ, revised July 18, 2016, describes duties that depend on the equipment, activity, employer relationships, and applicable rules. Verify the current requirements for the live project with the competent safety and lifting professionals.
Use a controlled installation sequence
- Release the delivery only after permits, route checks, weather review, foundation acceptance, utility conflicts, and crane setup have been confirmed.
- Conduct a pre-start meeting with the supplier, transporter, crane director, site supervisor, utility representatives, and inspection personnel. Review drawings, signals, exclusion zones, emergency contacts, and stop-work authority.
- Position the crane and support system on the approved ground-preparation layout. Inspect mats, cribbing, outriggers or tracks, level, clearances, and proximity to hazards.
- Receive each vehicle in the planned order. Verify module identification, visible shipping damage, lifting points, rigging condition, and the next set location before connecting the load.
- Lift, guide, and place the module under the appointed signal person’s direction. Keep nonessential people outside the exclusion zone and stop for unexpected movement, wind, communication failure, or a change in ground condition.
- Secure modules with the specified temporary or permanent connections before releasing the rigging. Install weather protection and temporary bracing exactly as the manufacturer directs.
- Complete module-to-module, foundation, utility, and life-safety connections, then release the area for the inspections required by the AHJ and the manufacturer.
6. Define interfaces, sequence, and inspections
Write a responsibility matrix
A written matrix prevents the common failure in which everyone assumes someone else is preparing the site. Include the owner, supplier, general or site contractor, foundation designer, utility contractors, crane company, transporter, inspector, and AHJ.
| Work package | Questions the contract or coordination plan must answer |
|---|---|
| Site preparation | Who clears, grades, drains, excavates, improves soil, restores roads, and provides temporary access? |
| Foundation | Who designs, builds, surveys, inspects, and accepts the foundation and anchors? |
| Utilities | Who obtains approvals, installs each service to the connection point, tests it, and pays connection or inspection fees? |
| Transport and crane | Who obtains route permissions, supplies traffic control, provides rigging, prepares crane ground, directs the lift, and handles a damaged or delayed load? |
| Module joining and weathering | Who installs gaskets, bolts, welds, sealants, roof or wall transitions, temporary bracing, and weather protection? |
| Closeout | Who submits as-built information, test certificates, warranties, inspection records, occupancy documents, and correction items? |
Separate factory checks from property inspections
Ask the manufacturer for a list of factory inspections and tests, such as production quality checks, concealed work records, and pre-shipment verification. Ask the AHJ which work must be inspected on site, including foundation reinforcement, anchors, underground utilities, structural connections, fire protection, accessibility, and final occupancy items. A factory approval does not automatically satisfy a local site inspection.
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7. Establish approval and readiness gates
Use objective release gates rather than a calendar date alone. The site is ready for delivery only when each applicable gate has an owner and evidence:
- Jurisdiction, zoning, building, fire, access, environmental, and utility approvals are identified and obtained or formally scheduled.
- Supplier drawings, foundation design, geotechnical information, structural calculations, and site plan revisions are coordinated and approved.
- Foundation construction, survey, tolerances, drainage, and anchor locations have been inspected and accepted.
- Utility routes, connection points, capacity, permits, and installation responsibilities are confirmed.
- Transport route, road permissions, staging area, traffic controls, and contingency arrangements are verified.
- Crane selection, ground preparation, lift plan, rigging, overhead-line controls, underground-hazard information, and exclusion zones are approved.
- Inspection dates, emergency contacts, weather limits, communication methods, and stop-work authority are written into the site briefing.
8. Compare alternative sites or delivery approaches
When several lots, foundations, suppliers, or installation approaches are possible, compare them against the same planning axes. A lower purchase price can be offset by difficult access, long utility extensions, extensive ground improvement, or an expensive crane setup.
| Comparison axis | Questions to ask |
|---|---|
| Approval feasibility | Can the proposed placement meet zoning, setbacks, accessibility, fire, drainage, and submission requirements? |
| Foundation and ground | Is the foundation compatible with the building design, and what geotechnical, excavation, stabilization, or crane-support work is required? |
| Utilities | Are water, wastewater or septic, electricity, fuel, communications, and fire services available at suitable capacity and cost? |
| Delivery and lifting | Can the largest vehicle reach the site, turn, stage, and leave safely, with adequate crane radius and ground support? |
| Responsibility clarity | Are supplier, owner, site contractor, utility, transporter, crane, and inspection interfaces documented without gaps? |
| Schedule and inspection | Can the site be ready when modules are manufactured, and can required inspections occur before work is concealed? |
9. Troubleshoot common planning failures
The foundation is complete, but modules do not fit
Typical causes include a superseded supplier drawing, incorrect anchor locations, elevation errors, unverified survey control, or a foundation built to a generic rather than approved design. Stop delivery, compare the as-built survey with the latest approved drawings, and obtain written direction from the structural designer and manufacturer. Do not grind, drill, shim, or relocate anchors without an engineered correction.
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The trailer can reach the neighborhood but not the lot
Recheck the final approach, gate, turning radius, shoulder, grade, and overhead clearances with the actual trailer dimensions. Options may include trimming vegetation, removing and replacing a gate, strengthening a crossing, obtaining temporary access rights, changing the delivery configuration, or selecting a different crane or staging point. Confirm every change with the road authority, property owners, transporter, and insurer before dispatch.
The crane setup area looks firm but settles
Stop the lift and keep people clear. Reassess soil, drainage, fill, voids, utilities, and mat or cribbing performance with the crane company and a qualified ground professional. Improve or relocate the setup only under an approved plan; never compensate for settlement by improvising packing beneath a loaded outrigger.
Utilities conflict with the foundation or crane
Use current records, locating results, surveys, and safe excavation practices to verify the conflict. Revise the route, foundation, crane position, or module orientation through the responsible designers and utility owners. Update every affected drawing and brief the crew before work resumes.
Inspections are missed or work is concealed
Create an inspection hold-point schedule tied to the construction sequence, not just a final inspection date. Notify the AHJ and inspectors in the time required locally, photograph concealed work, retain test certificates, and obtain written acceptance before backfill, enclosure, or module joining prevents access.
Weather or a late vehicle disrupts the set
Define weather limits and a cancellation deadline with the crane director and supplier. Keep the foundation protected, maintain a secure staging or return plan, and ensure utilities, traffic control, and labor can be rescheduled without leaving a partially secured module exposed. The site supervisor should have authority to stop the operation when conditions differ from the approved plan.
10. Keep the plan current through installation
Assign one person to control revisions and distribute changes to every affected party. At each daily briefing, confirm the module order, ground and weather conditions, utility status, exclusion zones, inspection hold points, and emergency access. Record deviations and approvals as they occur. A site plan is successful when the approved building can arrive, be lifted, connected, inspected, and serviced without last-minute assumptions.
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