For a standard accessory dwelling unit (ADU) installation in California, a crane costs between $2,800 and $7,200. If the crane must lift the unit over a two-story house or avoid severe overhead obstacles, the price often reaches $8,000 to $10,000.
In dense areas like the San Francisco Bay Area and Los Angeles, crane rental is a standard part of modular construction. Buyers are often surprised to learn the ADU seller usually does not cover the crane cost. That expense, along with permits and site preparation, falls to the homeowner or general contractor.
This guide explains what you are paying for, the hidden costs that inflate budgets, and how to prepare your property for installation.
The Shift to Modular ADUs and Crane Delivery
California legislation encourages adding ADUs to single-family lots. To save time and reduce noise, many owners choose prefabricated units. These buildings arrive on flatbed trucks up to 90% complete.
This method requires moving a 15,000 to 30,000-pound structure from the street to the backyard foundation. The unit must be hoisted, requiring heavy equipment.
For related guidance, read about modular home set day planning.
Read your purchase contract carefully. Manufacturers charge a delivery fee, but this usually only covers trucking the unit to your street. Lifting the building onto your concrete pad is a separate expense. You or your general contractor must hire a local crane service.
Average Crane Costs for ADU Installation
Crane pricing combines hourly rentals, travel fees, and labor. Here is what makes up the $2,800 to $7,200 average cost.
Hourly Rental Rates and Minimums
Cranes are rented by the hour based on the machine’s size. Most ADU installations require a mobile hydraulic crane with a 40-ton to 90-ton capacity.
- Hourly Rate: Expect to pay $300 to $600 per hour for the crane and a certified operator.
- Minimums: Crane companies enforce a minimum time requirement, usually four to eight hours. Even if the lift takes 45 minutes, you pay for a half or full day.
Mobilization and Travel Fees
You pay for the time it takes the crane to travel from its yard to your property and back, known as a mobilization fee.
- Mobilization Cost: $500 to $1,500. Heavy traffic increases this cost. Companies charge either a flat travel fee or bill the travel time at their standard hourly rate.
Rigging and Support Crew
The crane operator runs the machinery but does not hook the ADU to the crane. You need a rigger to secure the load and guide the operator.
- Crew Cost: $1,000 to $2,500. Proper rigging keeps the unit level, preventing damage to the drywall or framing. You may need a multi-person residential ADU crane rigging team.
Factors That Drive Up the Final Price
Base rental rates provide a starting point, but your property layout dictates the final bill.
The Reach
Distance matters as much as weight. The reach is the distance from the crane to the ADU foundation.
If the crane parks next to the foundation, it performs a short reach lift using a smaller, less expensive machine.
If the crane parks on the street and lifts the ADU over your house, the reach increases. Lifting heavy loads at long distances reduces a crane’s capacity. Lifting a 15,000-pound unit over a two-story house requires a 200-ton or 300-ton machine, which costs more per hour and has higher mobilization fees.
Unit Size and Weight
Weight dictates the required equipment. A wood-framed studio is relatively light. Units with steel frames, concrete floors, or heavy appliances weigh more. Provide the exact shipping weight from the manufacturer so the crane company sizes their equipment correctly.
Swing Path and Airspace
The swing path is the route the ADU travels through the air from the street to your backyard foundation. Cranes require a clear corridor at least 20 feet wide so the unit can hang from the cables and rotate slightly in the wind without contacting your roof, chimney, or trees.
Before requesting quotes, walk the street where the crane will park and identify every object intruding into that airspace: roof overhangs and eaves, chimneys, satellite dishes, large tree branches, telephone poles, utility wires, and streetlights. Problems found early give you time to trim branches or request utility adjustments before the crew shows up.
Overhead Obstacles
Cranes need clear airspace. Mature trees or utility lines slow down the lift, increasing your hourly bill. If clearance is too tight, the crane company may require an arborist to prune trees before starting the job.
California cities have strict regulations about tree pruning and removal. If the obstructing tree sits in the parkway between the sidewalk and the street, it is likely city-owned. Cities like San Francisco, San Jose, and Los Angeles require an Urban Forestry Permit before trimming a street tree, and permitting takes one to four weeks. For trees on private property, check whether the species is protected—native trees like the Coast Live Oak and Western Sycamore require permits even for significant pruning, and tree removal often mandates planting replacements. Address tree clearances at least three months before delivery to avoid a last-minute schedule hold.
Street Access
Mobile cranes are larger than commercial trucks and need space to deploy stabilizing outriggers. If you live on a narrow or winding road, a large crane may not fit. The company must use specialized compact equipment, which carries a premium price.
Hidden Costs to Budget For in California
Beyond the crane company quote, California municipal regulations introduce mandatory soft costs.
Street Encroachment Permits
If the crane parks on a public street, you must apply for an encroachment permit from your local public works department. In San Francisco this is called a Temporary Occupancy Permit; in Los Angeles, a Temporary Street Closure Permit. Most applications require a Traffic Control Plan showing where the crane will sit, how traffic will reroute, and where pedestrians will walk. Cities typically need two to four weeks to review and approve these plans.
- Permit Cost: $500 to $2,000. You must also post official “Tow-Away, No Parking” signs along the curb at least 72 hours before the crane arrives so neighbors can move their vehicles.
The flatbed truck hauling your ADU is an oversize load. California Department of Transportation (Caltrans) requires a Single Trip Permit for loads wider than 8.5 feet. Since most ADUs are 10 to 12 feet wide, the delivery truck will likely need pilot cars (escort vehicles with flashing lights) and will be restricted from traveling during peak commute hours. Factor these logistics into your delivery-day scheduling.
Traffic Control and Flaggers
If the equipment blocks a traffic lane, the city requires a professional traffic control plan. You must hire a certified company to set up warning signs and provide flaggers.
- Traffic Control Cost: $1,000 to $3,000.
Utility Disconnects and Power Line Clearances
Overhead power lines are a major safety hazard. Under Cal/OSHA regulations, the legal minimum clearance between any part of the crane—including the boom, cables, and suspended ADU—and energized residential distribution lines is 10 feet. Because heavy loads sway in the wind, Cal/OSHA also requires a 20-foot planning zone: if any part of the operation could come within 20 feet of energized lines, you must implement strict safety measures and post a dedicated spotter.
If your property is too tight to maintain that clearance, you must contact your utility to request temporary de-energization. Submit this request at least 30 business days before delivery.
- Utility Cost: $500 to $1,500 or more.
Permanent placement matters too. Under California Public Utilities Commission (CPUC) General Order 95, the roof of the installed ADU must remain at least 12 feet below primary overhead lines, and walls typically must maintain 4 to 6 feet of horizontal clearance from the vertical plane of the wires. If your foundation plan violates these clearances, the utility can refuse service or require you to relocate the building.
The Pre-Lift Site Walk
Reputable crane companies mandate a site visit before providing a final price.
An estimator will measure the distance from the street to the pad, inspect overhead clearance, evaluate street slope, and determine where the delivery truck will park.
They also check ground stability. Cranes exert heavy pressure on their outriggers. The company must verify the surface can support the weight without cracking the concrete or sinking. Companies may charge $200 to $500 for this site walk, often crediting it toward your final bill.
Preparing Your Property for Crane Day
Because you pay by the hour, delays cost money. Prepare your property to keep the budget under control.
Clear the Work Zone and Airspace
Clear all vehicles from your driveway and the street in front of your house. Move landscaping boulders, garbage cans, and portable basketball hoops. Hire an arborist to trim any tree branches hanging over the lift path well before the lift. If branches block the way, the operator will halt the job.
Check the Foundation
The concrete pad or pier system must be finished and cured before the unit arrives. Clear the immediate area around the foundation so the crew can work safely.
Evaluate Ground Moisture
Heavy rain softens ground soil. If the crane must place an outrigger on dirt or grass, soft soil poses a safety hazard. Notify the crane company about ground conditions so they can bring extra timber mats to distribute the weight.
Communicate with Neighbors and HOAs
Industrial equipment causes disruptions. At least 48 hours before delivery, hand out informational flyers to adjacent neighbors listing the date and time of the delivery, which sections of the street will be closed, and your direct phone number. Good communication prevents noise complaints that can halt your project.
If you live in a Homeowners Association (HOA), clear the delivery through the architectural review committee before scheduling the crane. HOAs have rules about blocking roads and noise. Submit your delivery plan, street closure permits, and the crane company’s insurance certificates to the board in advance. Most cities require the crane company to carry $1 million to $2 million in general liability insurance, and the HOA will likely ask to be listed as an additionally insured party.
Mark Underground Utilities
Never allow a crane to set up directly over underground water mains, sewer lines, or gas pipes. The pressure from outriggers will crush them. Call 811 at least two business days before the crane arrives to have all underground utility lines marked with paint. This service is free and legally required in California before any ground disturbance.
The Lift Execution: What Happens on the Day
The crane arrives first, typically early in the morning. The crew spends an hour or more extending the outriggers, placing composite pads under the feet to distribute weight, and conducting safety checks.
The flatbed truck carrying your ADU reverses into position. The rigging crew secures the load to the crane.
The team reviews safety protocols before the lift begins. Read about these checks in our guide on how to plan a critical lift.
The operator lifts the unit slightly off the trailer to check balance. Once confirmed level, they swing it over to your backyard. A ground crew uses taglines to prevent the unit from spinning in the wind.
The crane lowers the unit onto the foundation, and the crew unhooks the rigging. The flying process often takes less than an hour.
Hiring the Right Service for Your ADU
Dropping a building onto a foundation requires experience. Ask specific questions when interviewing crane companies.
Verify insurance coverage. A general liability policy covers property damage, like a cracked driveway. Ask if they carry “on-hook” coverage, which insures the ADU itself while suspended in the air. If the unit drops, this policy pays to replace it.
Ask about modular home experience. Lifting a finished home requires careful rigging so the frame does not twist, which cracks drywall or shatters windows.
Clarify the weather cancellation policy. Cranes cannot operate if wind speeds exceed safe limits, typically 20 to 30 miles per hour. Determine who pays the daily rental fee if unexpected winds delay the lift.
Establish responsibility for soft costs. Clarify whether the crane company pulls street encroachment permits and supplies traffic control flaggers, or if you must handle those tasks. Get every detail in writing before signing the contract.