Modular Building Hauling Services
Modular buildings and prefab structures present a specific challenge in heavy haul transport: they are almost always wider than the legal 8-foot-6-inch highway limit, frequently taller than standard clearance heights, and long enough to require either a specialized trailer configuration or a permit for overlength loads. R&RM LLC has been transporting oversize loads across all 48 continental states since 2011. Whether you are moving a single portable office trailer across a state line or relocating a multi-section modular school across the country, we handle the permits, the trailer selection, and the escort coordination.
Types of Modular Buildings We Transport
Portable Office Trailers and Job Site Buildings
Construction site office trailers are among the most frequently relocated modular structures in the country. Standard office trailers range from 8 feet to 14 feet wide and 36 feet to 72 feet long. Trailers up to 8 feet 6 inches wide travel on a standard flatbed within legal limits; anything wider enters oversize territory and requires a wide load permit, OVERSIZE LOAD banners, and in most states a pilot car escort.
- Single-wide office trailers: 8′ to 12′ wide, 36′ to 72′ long, 12,000 to 30,000 lb
- Double-wide office complexes: Transported in two sections, 24′ total width when set — each section 12′ wide on the trailer
- Restroom and break room trailers: Same size range as office trailers, similar transport requirements
- Security guard booths: Small and lightweight, but often taller than standard clearance heights
Portable Classrooms and School Buildings
School districts and universities across the country rely on portable classrooms to manage enrollment fluctuations and campus renovation projects. These structures are typically 14 feet wide and 64 feet long — both dimensions that require oversize permits in all states and pilot car escorts in most. Height varies by manufacturer, with some portable classrooms reaching 14 feet 6 inches or taller on a transport trailer, requiring height permits on routes with low bridges.
School moves are time-sensitive: portable classrooms typically need to be in place before the start of a school year or semester. Our permit team understands the urgency and works to process permits as quickly as each state's DOT allows. Our permit services handle all applications for multi-state moves.
Modular Homes and Residential Structures
Manufactured and modular homes are built in sections at a factory and transported to the home site for final assembly. Single-wide manufactured homes are typically 14 to 18 feet wide; double-wide homes are moved in two sections that, when set, total 24 to 36 feet in width. Each section must travel separately on its own permit and its own trailer. Transport of residential modular structures involves close coordination with local building departments and utility companies at the destination site.
Industrial Modules and Skid-Mounted Equipment Buildings
The oil and gas, chemical, and power generation industries use prefabricated process modules and equipment skids that are built in a facility and shipped to the field in one piece. These structures can be extremely large — some process modules measure 80 feet long, 20 feet wide, and 18 feet tall — and extremely heavy, ranging from 50,000 to several hundred thousand pounds. Transport of industrial modules often requires multi-axle lowboy or hydraulic platform trailers, superload permits, and full escort packages.
Related: pressure vessel and industrial tank transport and power transformer transport follow similar permit and trailer requirements.
Specialty Modular Structures
- Medical clinic trailers: Temporary clinic and medical office buildings for hospitals, military bases, and disaster response
- Data center modules: Prefabricated data center containers and modules with integrated cooling and power systems
- Retail kiosks and modular storefronts: Food service trailers, retail booths, and modular store structures
- Military and government field structures: Blast-resistant buildings, command post modules, and prefab base facilities
- Precast concrete panels and components: Wall panels, tilt-up sections, and stair assemblies transported to construction sites
Trailer Types for Modular Building Transport
The right trailer for a modular building move depends on the structure's dimensions, weight, and whether it travels on its own chassis or must be crane-loaded.
Flatbed with Wide Load Permits
Single-wide office trailers and portable classrooms that have their own running gear (axles and wheels attached) typically move on their own wheels pulled by a semi tractor — not on a separate trailer. In this configuration, the structure rolls like a trailer and the oversize width drives the permit and escort requirements. Wide load transport of this kind is one of the most common forms of oversize freight on American highways.
Drop Deck and Step Deck Trailers
Structures that must be loaded onto a trailer rather than towed on their own wheels use a drop deck or step deck when height must be minimized. The lower deck height of a drop deck — typically 36 to 42 inches off the ground — is critical when the structure's height already consumes most of the permitted clearance.
Multi-Axle RGN Trailers
Heavy industrial modules that do not have their own chassis and exceed normal flatbed weight limits load onto removable gooseneck trailers. The detachable gooseneck allows the module to be driven or craned directly onto the trailer deck at grade level, simplifying loading for structures that cannot be lifted from above. See our RGN hauling service for more detail on how RGN loading works and when it is the right choice.
Hydraulic Platform Trailers
The largest industrial modules — process skids weighing more than 200,000 pounds or structures requiring very precise load distribution — move on hydraulic platform trailers (also called self-propelled modular transporters, or SPMTs). These are specialized trailers with computer-controlled hydraulic suspension systems that allow the load height to be adjusted in transit and the weight distributed across many axles to stay within per-axle bridge limits. SPMT transport is superload territory and requires engineering studies, detailed route surveys, and extensive permit applications.
Oversize Permit Requirements for Modular Buildings
Almost every modular building transport requires at least a width permit. Legal highway width for a loaded vehicle is 8 feet 6 inches in most states; an office trailer or portable classroom that is 12 or 14 feet wide is significantly oversize in every state it passes through.
Width Permits and Pilot Car Thresholds
Width permits are required for any load wider than the state's legal width limit, which is 8 feet 6 inches in nearly all of the 48 continental states. Pilot car (escort vehicle) requirements kick in at different widths depending on the state:
- 12 feet wide: One pilot car (typically front) required in most states
- 14 feet wide: One or two pilot cars required in most states; some states require a rear escort beginning at 14 feet
- 16 feet wide: Two pilot cars (front and rear) required in virtually all states; some states also require law enforcement escort
- Over 18 feet wide: Law enforcement escort typically required; some states require advance notice to state police before travel
Our team pulls permits for every state on the route and arranges pilot cars as part of the move. See our pilot car requirements guide for a state-by-state breakdown of escort thresholds.
Height Permits
Standard legal height on most US highways is 13 feet 6 inches. Many portable classrooms and office trailers on transport trailers reach 13 feet 6 inches to 14 feet 6 inches, requiring height permits and route planning to avoid low bridges. Some states issue height permits readily; others require a detailed route survey and bridge height verification before a permit will be issued for loads taller than 14 feet.
Length Permits
Standard legal length for a combination vehicle is 53 feet in most states. Office trailers 60 feet and longer, and industrial modules of similar length, require overlength permits. Length permits are generally less complex to obtain than width or height permits, but they do specify the maximum legal length and may restrict travel to certain routes.
Planning Your Modular Building Move
Dimensions and Weight Are Critical
Permit applications require exact dimensions and weight. For modular buildings on their own chassis, the permitted width is measured to the widest point of the structure, including any roof overhangs, eave projections, or exterior wall attachments. For structures loaded on a trailer, the loaded height must account for the trailer deck height plus the structure height. If dimensions are not available from the manufacturer, we can work with approximate figures — but the permits will be issued for those figures, and a structure that is actually wider or taller than permitted cannot legally travel.
Site Access
Modular building moves require clear site access at both pickup and delivery. A 14-foot-wide portable classroom needs a 14-foot-wide clear path from the road to the setting location. Low overhead utility lines, tree branches, and gate widths all need to be verified before the move. At the destination, the setting area must be firm enough to support the structure's weight during unloading and placement.
Lead Time
Plan on a minimum of 3 to 5 business days for permit processing on a standard modular building move. Multi-state moves with width exceeding 14 feet, or any move requiring superload permits, may need 1 to 3 weeks of lead time. Contact us early — especially for school relocations with a fixed start-of-year deadline.
Modular Building Transport Industries We Serve
- Construction and general contracting: Job site office relocations between active projects
- Education: Portable classroom moves for K-12 districts and universities
- Healthcare: Medical clinic trailer relocations for hospitals and mobile health providers
- Oil and gas: Man camp modules, process skids, and wellsite facility buildings
- Military and government: Field facility structures, command modules, and base camp buildings
- Modular home dealers and manufacturers: Factory-to-site delivery of manufactured and modular homes
- Commercial real estate: Temporary retail, office, and hospitality structures
Get a Quote for Modular Building Transport
To quote a modular building move, we need the structure's width, height, length, and weight; pickup and delivery addresses; and your required pickup date. If the structure is on its own chassis, note whether it has functioning running gear. If it needs to be loaded on a trailer, note whether a crane will be available at the origin or whether a crane-tail trailer is needed.
Call us at (404) 987-6225 or request a quote online. R&RM LLC, based in Cumming, Georgia, has been handling oversize load transport across all 48 states since 2011.
Related Equipment & Services
- Pressure Vessels & Tanks — industrial modules, process skids, and large vessel transport
- Transformers & Industrial Equipment — power equipment and large industrial loads
- RGN Hauling — how removable gooseneck trailers work for wide and heavy structures
- Oversize Load Transport — full guide to oversize permitting and routing
- Pilot Car Requirements by State — escort thresholds for all 48 states