Price crane inspection intervals into your hourly rate by checking operating hours and calendar deadlines, then allowing for inspection stops or a replacement crane.
Key takeaways
- Check the rule that governs your job before using California's figures.
- Compare remaining inspection hours with estimated meter hours for the job.
- Check certification and proof load test dates against your schedule.
- Put stopped time, inspection timing or a crane swap into the quote.
One counts hours of operation. The other counts calendar time. If either clock runs out while a crane is on your job, the crane may have to stop until someone examines it, and that lost time lands on your schedule and your margin. This post shows how to find both intervals, turn them into assumptions you can price, and write those assumptions into the rate you quote or accept.
Most of the figures here come from California's crane rules in Title 8 of the California Code of Regulations, because that text states its limits in plain numbers. Those are California's rules, and other places set their own. The UK guidance from the Health and Safety Executive is used where it covers who is responsible for a lift, a question that comes up on almost any hired crane.
Confirm who owns the inspection duty
Before you price any inspection, settle whether the duty belongs to you or to the hire company. The Health and Safety Executive's guidance on lifting operations says the law requires every lifting operation to be properly planned by a competent person, appropriately supervised, and carried out in a safe manner. It also says cranes and lifting accessories must be of adequate strength, tested, and subject to the required examinations and inspections. Lifting operations, HSE
The same guidance speaks to hired cranes directly. When a crane is hired, responsibility for planning, supervising and carrying out the lift rests with the user, unless the hire company explicitly takes those responsibilities on under a "contract lift." That gives an estimator a clear test for any rental quote. If the quote does not say the hire company has taken the duties on as a contract lift, plan on the planning and supervision being yours, and price the time your own people need to do them.
The HSE page also points to British Standard BS 7121 Part 1 (2006) as an acceptable standard for managing lifting operations using cranes on construction projects. If your bid crosses into the UK, that standard is a useful reference when you write the lift plan, and the rate should reflect the planning time it requires. Planning time is easy to leave out of an hourly figure because it happens before the crane arrives, so put it on the sheet as its own line.
Ask for the inspection file before you sign. Ask who holds it, what date the last examination took place, and whether the crane will arrive with its examinations current for the days you need it. Ask who will check the crane before the first lift, and whether that person is the one named in the lift plan. Get the answers in writing. A verbal assurance about inspection status is hard to defend when a crane is stopped on a Monday morning and the crew is waiting for paperwork.
Read the hour meter against the 750-hour limit
The first clock counts hours. The California inspection section sets the rule plainly: "Cranes shall not be operated more than 750 hours, between periodic inspections." Title 8, Section 5031 Your job is to find out how many of those hours the crane has already used and how many your job will add.
Get three numbers from the hire company: the hour reading at the last periodic inspection, the reading today, and the hours between them. To calculate hours used, subtract the reading at the last periodic inspection from the start-of-shift reading. Then compare that figure with your own crane-hour estimate for the job. If the crane has already logged most of its allowance and your job needs a substantial block of crane hours, the total may pass the limit before the job ends. The crane would then need an inspection in the middle of your schedule. This is a hypothetical case, but it shows how a crane that looks fine on the day of the quote can need attention partway through the work.
Ask the hire company how the hour meter is read, whether the reading on the machine matches the hours in its inspection records, and whether the meter runs during standby, setup and travel. Each answer changes your estimate. If the meter runs during standby and your job has long waits between lifts, the hours can climb faster than the lift time suggests. A crane that waits through a shift for a trade to clear the site may add hours to the meter without lifting anything.
Keep two figures in your estimate. The first is the crane hours you bill to the client. The second is the crane hours on the meter. Those are not always the same number, so write both down. The first drives your rate. The second decides when the next periodic inspection falls, and that date controls whether the crane can keep running on your job.
Keep the inspection deadline separate from operating costs when you talk to the client. Mixing them up is how a rate ends up carrying a cost that belongs in a contingency, or a contingency that should have been a hard line.
Turn the hour limit into a schedule and a contingency
Once you know the hours remaining, decide what you will do about them. There are three practical choices, and each one belongs in the rate or the contract.
The first is to accept the crane and carry the risk. If the crane will reach its limit partway through your job, the periodic inspection will land in the middle of your schedule. Build a line for what a stopped crane costs: the crew on standby, the delay to every trade that waits on the lift, and any rescheduled delivery. Price that line as a contingency, not as a guess buried in the hourly rate. A buried guess disappears the first time someone asks what it covers, while a named contingency can be defended and adjusted.
Count the stop in crew hours, not crane hours. Take the number of people held idle, multiply by the hours they wait, and then add the crane's own standby and the delay to the trades behind the lift. Multiply the crew hours by the labor rate on your own sheet, and the result is the contingency for that stop. If you expect more than one stop, price each one separately, because each periodic inspection brings its own stopped time. Check your labor allowance alongside crew paid-time and overtime costs.
Illustrative example: price crew waiting time
Suppose an inspection stop leaves 5 people waiting for 10 hours. That is 50 crew hours. Multiply those hours by your own labor rate, then add the crane's standby charge and other affected costs separately. These illustrative figures show the calculation, not an expected inspection duration or a quoted price.
The second is to ask for a crane with more hours left. This is often the simplest fix. A crane that arrives with a fresh inspection and plenty of hours remaining before its next inspection gives you room for the whole job. It costs you one question to the hire company, which is far cheaper than a schedule problem on site. If the hire company has a choice of machines, ask which one has the most hours remaining before its next periodic inspection.
The third is to time the inspection on purpose. If the periodic inspection can be done before the job starts, the crane arrives with a fresh record. If it can be done at a planned break, such as a weekend or a gap between phases, the stop costs less than an unplanned one. Write the chosen date into the schedule so the whole team sees it and the trades can plan around it.
Whichever choice you make, write it into the quote. If the rate assumes a crane that will hit its limit mid-job, the quote should either carry a contingency for stopped time or state that the hire company will swap the crane. Make the swap clause specific. Name who pays for the swap, how long it takes to bring a second crane to site, and whether the hourly rate changes while the first crane is out of service. A clause that says only "replacement as required" leaves the price open at the moment you can least afford it.
Add the calendar clock: annual certification and the four-year load test
The second clock runs on calendar time. It is the one estimators tend to miss because it does not show up on a meter. The California section ties periodic inspections to the annual certification required by Section 5021(a). In its words: "The annual certification, as required by Section 5021(a), can serve as one of the required periodic inspections." Title 8, Section 5031 For scheduling, that means the certification date is a point at which an inspection can fall inside your job window. Find out that date for every crane you rent, and check it against the start and end dates of your job.
The same section sets a four-year cycle for proof load tests. It reads: "In any year in which no quadrennial (every four years) proof load test is required on cranes or derricks, such equipment shall be examined by a qualified person as described in Section 5021." Neither kind of year is free of examination, and the rate should not assume that a quiet year means no work.
Put that into dates. Suppose your job runs from late in one calendar year into the next. The annual certification may fall in one year and the proof load test in the other. You would then need to check both years, and the rental quote should say which requirement applies to the crane you are getting. A job that looks like a short rental can carry inspection obligations from different parts of the cycle.
Keep the calendar clock separate from the hour clock. A crane can be well inside its hour limit and still be due for its certification. The reverse is also possible: a crane can have its certification current and still have used most of its hours. Each clock needs its own check, and a clean result on one tells you nothing about the other.
Do not put a cost figure on it without a quote from the person who will do the work. A rate that says "inspection included" with no figure behind it is a risk you have not priced. If the hire company will not name the inspector or give you a date, treat that as a gap in the quote, not as a detail to sort out later.
When a certification date falls inside your job, ask the hire company whether the examination will be done on site and how much of the crane's working time it will take. The quote should say which of those you have priced, so the schedule shows the stop before it happens.
Price the parts that fail on their own timing
Inspections are not the only thing that can take a crane out of service. Hooks and wire rope can fail on their own timing, and the California section gives removal criteria rather than a fixed replacement schedule. That difference matters for how you write a contingency.
For hooks, the section says: "Crane hooks with cracks or with deformation of throat opening more than 15 percent in excess of normal opening or more than 10 degree twist from plane of unbent hook shall be removed from service." Title 8, Section 5031 Any one of them is a reason to take that hook out of use. An estimator does not need to inspect a hook personally to price the risk, but should ask the hire company whether the hook has been checked against those limits recently, and whether the record is on file.
For wire rope, the section gives wire-break counts for running ropes: "In running ropes, 6 randomly distributed broken wires in one rope lay, or 3 broken wires in one strand in one lay." The section also includes a timing note: "Note 1: Many variable factors are involved in determining the exact time for replacement of rope and timely replacement for safety." Title 8, Section 5031
That note is the one to remember when you write a rope allowance. Ask for the rope's inspection record and its replacement history, and price a contingency that reflects the crane's age and use. A crane that has worked hard on a long run of similar jobs may need closer attention than one that has done light work. That is a judgment about the specific crane in front of you, and the record is what supports it.
These are California's criteria. A manufacturer's manual, another jurisdiction, or the crane's own inspection program may set different limits. Where your rate depends on a particular limit, name the source in the quote so the hire company can show that the crane meets it. A quote that cites no criterion is hard to check after the lift, and hard to dispute when a rope or hook is pulled from service mid-job.
Write the two intervals into the rate sheet
Pull the threads together in the rate sheet. Each assumption should have a number or a date, a source, and a named party who will confirm it. Record the meter readings, estimated job hours, certification date, proof load test year, rope and hook condition, and lift responsibilities. Use source checks before pricing a rule when checking the basis for each assumption.
Fill the sheet before you agree the rate, not after. Each entry answers one question the hire company should be able to answer in writing. If the hour reading, the certification date, or the proof load test year is missing, do not fill the gap with a guess. Ask for the record, or add a contingency and a swap clause to the quote so the risk has a price and an owner. A contingency does not replace a required inspection.
Revisit the sheet whenever the crane changes or the job moves into a new calendar year. An hour reading that was accurate on the day of the quote is out of date the moment the crane starts working, and a certification date that sat outside your window at the start may sit inside it by the time the job is running.
On a live job, the sheet works best as a daily check rather than a one-time form. When the remaining hours fall below what the rest of the job needs, bring the swap or the inspection date to the hire company that day, not after the crane has stopped.
Take the next step today
Ask the hire company for the latest inspection record, current meter reading and next examination dates today. Compare them with your job schedule before agreeing the rate.
Related guides: California tower crane permits: 2 types to check · Construction overtime cost: 5 inputs for a bid rate · Construction wage selection: 3 checks for a bid rate.
Common questions
Does annual certification replace every periodic inspection?
No; annual certification can serve as one of the required periodic inspections. Check the crane's operating hours as well as its certification date.
How should I price an inspection stop?
Price the crew's waiting time, crane standby and affected trades separately. Use your own rates and the hire company's timing estimate, then state the allowance in the quote.