Every state your mobile home crosses gets to charge for the trip, and what it charges is keyed to width. Federal rule sets the standard legal load width on the National Network of highways at 102 inches, which is 8 feet 6 inches, and nearly every livable mobile home is wider than that. Cross the line and the move becomes an oversize load: a permit from each state on the route, escort cars once the load passes thresholds that typically begin around 12 feet, daylight-only travel windows, and a route the permit office chooses rather than the one your map app prefers. That is why two moves of identical distance can be priced worlds apart, and why the first question any honest quote asks is the width.
This guide explains how the oversize system actually works, what each layer adds to the bill, and where to find the controlling rules for the states on your route.
Where does the 8 foot 6 inch line come from?
The width standard is federal. Under 23 CFR Part 658, the maximum vehicle width on the National Network, the system of Interstates and designated federal-aid highways, is 102 inches. Freight inside that envelope moves with no special permission, which is why the box trailers you pass on the highway never carry banners or pilot cars.
A mobile home does not fit the envelope. Single-wides commonly run 12 to 16 feet wide, and each half of a double-wide is itself typically 12 feet or more. There is no way to fold a home to legal width, so the move happens under a different legal instrument entirely: the oversize permit.
What is an oversize permit, really?
An oversize permit is a state's written permission for one specific overwidth load to travel specific roads under specific conditions. Three parts of that sentence carry the cost:
- One state. Permits do not cross borders. A route through three states needs three permits, obtained under three different fee schedules and rulebooks, each issued by that state's DOT permit office.
- One load. The permit attaches to the load and hauling equipment, not to your project. A double-wide traveling as two halves is two loads, so every state on the route is paid twice.
- Specific roads and conditions. The permit names the approved routing and its conditions: travel hours, escort configuration, flags and banners, and maximum speeds. Deviating from it is a violation, which is one reason professionals, not homeowners, typically pull these permits.
Permit fees themselves are usually the smallest layer of the width bill, commonly running from tens of dollars to a couple hundred dollars per state per load as a planning figure. The expensive consequences are the ones the permit triggers: escorts, routing, and time.
When are escort cars required?
Escort cars, also called pilot cars, are the flag bearers of an oversize move: a car ahead warning oncoming traffic and scouting pinch points, a car behind protecting the load's blind side, both in radio contact with the driver. States set their own escort thresholds, and they typically look like a ladder:
- Modestly overwidth loads, in many states, travel with banners and flags but no escort on divided highways.
- As width passes roughly 12 feet, one escort commonly becomes required, often front or rear depending on whether the road is divided.
- As width climbs toward 14 to 16 feet, two escorts, front and rear, are commonly required, and some states add height poles, specific signage, or police escorts on certain roads at the widest end of the ladder.
Those brackets are typical patterns, not your state's law: thresholds and configurations genuinely differ state to state and road type to road type, and the permit for your exact route is the controlling document. Confirm specifics with the oversize permit office of each state DOT on your route.
Escorts matter to the budget because they bill by the mile, commonly a few dollars per mile per car as a planning figure. Two escorts across 300 miles is a real line item, and on a double-wide the configuration can apply to each half. Width sets how many cars; distance sets how much each one costs. That interaction is most of why our Move Cost Estimator asks for both.
Why do wide loads only move in daylight?
Because the entire system is built on visibility. States typically restrict oversize travel to roughly sunrise-to-sunset hours, and many also restrict weekends, holidays, and high-traffic windows around major cities. Weather adds another gate: permits commonly bar movement in high wind, and a home's flat sides make it honest sailcloth, so transporters watch forecasts the way pilots do.
For your planning, the practical consequence is time. A 500-mile move is not one driving day; it is two or three permitted daylight windows, plus any days lost to weather, plus the wait for permits themselves, which can take from a day to a few weeks depending on the states and whether the route needs engineering review. Our cost guide covers how that time shows up in quotes.
Who chooses the route?
The permit office does, within limits. Oversize routing avoids low bridges, weight-restricted spans, narrow work zones, and roads a state simply does not allow wide loads to use. The result is that a mobile home's route is often longer than the direct one, and per-mile pricing follows the permitted route, not the shortest one. On the widest homes, some states require a route survey, and moves past utility lines can require the utility to lift wires, a service that carries its own fee.
None of this is arbitrary. A 16-foot load on a 24-foot road occupies both lanes; somebody has to have checked, in advance, every bridge and pinch point it will meet. The permit is the proof that somebody did.
Who pulls the permits for your move?
For the transport itself, the transporter typically pulls the oversize permits, because the permits attach to the hauling equipment and the load, and because permit offices deal in carrier credentials: USDOT numbers, insurance certificates, equipment specs. You can verify any interstate carrier's USDOT registration yourself in FMCSA's public SAFER system, which is part of our own vetting bar.
What commonly lands on the homeowner is the destination side: the county or city placement or installation permit, utility connection permits, and park approvals. Those are separate from the road permits and are governed by local building authorities and the federal installation standards at 24 CFR Part 3285; our guide to setup after the move covers that half. A good quote states in writing exactly who is pulling what, on both halves.
Frequently asked questions
Can I just move the home without permits and hope for nothing?
No, and not only because it is illegal. An unpermitted oversize move risks fines, an impounded load, voided insurance, and personal liability for anything the load hits, with your home stranded mid-route while it gets sorted out. The permit layer is a few hundred dollars on a bill measured in thousands; it is the cheapest insurance in the whole project.
Do permit rules apply on the last few miles of county roads?
Yes. State permits cover state road systems, and some counties and cities have their own oversize rules for local roads, which transporters handle as part of routing. The last mile into a park or rural site is often the tightest of the whole route, legally and physically.
Why did my quote change after the transporter ran the route?
Because the permit system answered something the estimate could not know: an escort configuration, a longer permitted routing, a bridge restriction, or a state fee formula. This is normal, and it is exactly why honest services quote in ranges before permits are run and in writing after. If a revised number ever comes without an explanation of which rule moved it, ask.
Where do I find my state's actual rules?
Search for your state DOT's "oversize overweight permit" office; every state publishes its fee schedule, width thresholds, escort requirements, and travel-hour rules. Those pages, not any summary including ours, are the controlling word for your route.
If you would rather hand the whole permit question to someone who does it weekly, request a free haul quote. We review your width and route, and we connect you with vetted pros as coverage opens, or say plainly that we cannot cover your route yet.