Mobile Home Tie-Downs & Anchors in Bullhead City

A tie-down system is the set of ground anchors and steel straps that keeps a manufactured home from sliding, racking, or lifting in wind. In Bullhead City three sets of rules touch it at once: the federal installation standard Arizona enforces, the city’s own permit checklist, and, on lots along the river and the washes, the flood rules. Anchor installs and retrofits run $600 to $3,500, and strap re-tensioning comes with every relevel.

What Bullhead City’s permit checklist says

Bullhead City publishes a zoning information pamphlet for manufactured and factory-built home permits (Information Series 18, Development Services, 2355 Trane Road). Its anchoring section is short and specific:

• A singlewide needs four anchors on each side: one at each corner plus two more per side attached to the frame.
• Anchoring materials and installation must be as specified by a registered architect or engineer, or by the state manufactured housing division’s design bureau.
• A separate Arizona Department of Housing installation permit is required alongside the city permit.
• The city inspects when the home is placed on the lot and again within three months, and tie-downs are on the list that has to pass before the city issues a Certificate of Compliance. The permit holder has 180 days to get there.

The same pamphlet says anchoring for homes wider than a singlewide is not required outside a designated floodplain. That line does not match the state: the Arizona Department of Housing’s installation FAQ states that all mobile homes and all new and used manufactured homes must be anchored. For a doublewide in Bullhead City, plan on anchors and confirm the count with Development Services and the Department before a permit is pulled.

River lots, washes, and the floodplain rule

The pamphlet ties floodplain status to the permit: when a lot falls in a FEMA-mapped floodplain, a separate Floodplain Development Permit ($120) is issued with the home permit. Arizona’s floodplain rules for manufactured homes, from 44 CFR, require the home to be securely anchored to an adequately anchored foundation system to resist flotation, collapse, or lateral movement, and elevated so the bottom of the frame is at or above the regulatory flood elevation.

That changes what an anchor is for. On high ground the load is wind from the side. In a mapped flood zone it is also water trying to float the home off its piers. Owners on lots near the Colorado River or a mapped wash should look up the flood zone before pricing anchors, because it changes the design, not just the paperwork. The city pamphlet also asks for site drainage of half an inch per foot for the first ten feet around the home, which keeps monsoon runoff from softening the ground around the anchor heads.

The soil table, and why caliche is its own case

Federal installation rules (24 CFR 3285.202) require the soil to be classified before anchors are picked. The table they use:

Every anchor has to be certified for the soil class it goes in and rated to a 3,150-pound working load and a 4,725-pound ultimate load (24 CFR 3285.402). Lime-cemented caliche is hard pan, Class 1, so an auger rated for Class 3 sand cannot just be screwed into it. Where the pan is shallow it is pre-drilled, or the manufacturer’s instructions or an engineer set an alternative anchor. Where the ground above the pan is loose gravelly fill, a torque probe reading low means a longer anchor. Both conditions can show up on one lot, which is why the survey probes more than one spot.

The weather the straps are working against

All of Arizona, Mohave County included, is HUD Wind Zone I under 24 CFR 3280.305, the lowest of the three federal zones. That governs how the home is built. It does not remove the anchoring requirement, and it does not describe summer here.

What an anchor system in Bullhead City meets is monsoon outflow. Haboobs form in and cross central Mohave County, National Weather Service forecasts on active days have carried gusts of 50 to more than 75 mph, and the season runs June 15 through September 30. It lands in the hottest part of the year: July averages a daily high of about 111°F, and the city sees 100°F on roughly 135 days a year. Many homes here sit empty through exactly those months while their owners are north, which is why slack or cut straps go unnoticed until October.

What a retrofit survey looks for

Under an existing home the survey checks the things the city checklist and the federal tables care about:

• Anchor count against the layout. A singlewide with only its four corners anchored is short of the city’s four per side.
• Strap tension. Straps go slack as piers settle; a relevel is the natural time to re-tension them.
• Corrosion and cuts. Straps cut for plumbing or electrical work and never replaced, and rust where the strap meets the anchor head.
• Anchor type against soil. Augers set in loose fill above the pan, or anchors with no visible rating.

Pricing

The anchor count, the soil class, and how many anchors have to be pre-drilled set the number. A floodplain lot can add engineering. The survey is free and the price is written before any drilling. Full tables are on the pricing page.

Who can do the work

Arizona licenses manufactured home installers through the Department of Housing, and anchoring is installation work. Ask us for the license number before any anchor goes in, and check it. A home on an engineered permanent foundation is anchored through that foundation, which is a different job handled with transport and setup.

The sensible times to look under the skirting are May, before the first outflow, and October, after a summer unattended. Buyers get the same check in a pre-sale inspection. We cover Bullhead City, Fort Mohave, Mohave Valley, Lake Havasu City, Golden Valley, and Kingman.