Short answer
There is no single number. The $3 million professional liability cost for a firm billing $1.5M to $2M depends on discipline, project types, claims history, deductible, and other underwriting factors. Two firms with the same billings can receive very different quotes. A broker can give a realistic range only after reviewing your actual operations and application.
Why can’t you price a $3 million professional liability policy by limit alone?
Carriers do not price coverage as a flat rate per million dollars. They rate the firm first, then apply the requested limits and retention.
Annual gross billings are the starting point, but they are only one input. A $2M architecture firm and a $2M structural engineering firm often present different risk, so the same billings can lead to different premiums.
What affects the $3 million professional liability cost?
Billings and discipline
Annual gross billings give the carrier a measure of exposure. Discipline then shapes how that revenue is viewed. Architecture, civil, structural, MEP, and other engineering work each carry different claims patterns, and carrier appetite varies.
Project types and geography
Residential, condominium, and other higher-severity project types may be rated differently from commercial or institutional work. Where you work can also matter, since some areas carry more claims activity.
Claims history and retroactive date
A history of claims or reported circumstances can raise the premium or limit your options. The retroactive date also matters, because an older date generally means the carrier is taking on more prior work.
Subconsultants and contractual risk
Firms that rely on subconsultants may be rated based on how those consultants are insured and contracted. Contracts with broad indemnification, or with limitation of liability clauses removed, can change how a carrier views the risk.
Deductible and defense costs
A higher deductible usually lowers the premium. The structure also matters. A first-dollar defense policy and a policy where the deductible applies to defense costs can differ in both price and how a claim plays out.
Per-claim and aggregate limits
Quotes for $3 million can be written as $3M per claim and $3M aggregate, or with a different aggregate. Each structure can price differently.
Does going from $1 million to $3 million triple the premium?
Not necessarily. Premium generally does not scale in a straight line with the limit, and the increase depends on the carrier’s rating approach.
Higher limits can also change the structure. A primary carrier may cap its limit, so the additional coverage may come from a different carrier or from excess coverage. That can affect underwriting requirements, terms, and total cost.
Real-world example
An engineering firm bills about $1.75 million a year and carries a $1 million professional liability policy. A client contract now requires $3 million per claim.
The firm’s broker requests quotes using the same application. One carrier offers $3 million primary with a higher deductible. Another offers $1 million primary with $2 million of excess above it. The two quotes differ in premium, deductible structure, and how defense costs apply.
The firm’s prior $1 million premium does not predict either quote. The final cost depends on the discipline, project types, claims history, and the specific policy terms offered.
What to check when you price a $3 million professional liability policy
- Whether the contract requires $3M per claim, in the aggregate, or both
- Your annual gross billings and your discipline
- The project types and locations you work in
- Your claims history and retroactive date
- Whether the deductible applies to defense costs
- Whether the quote is one policy or a primary plus excess structure
- How you use subconsultants and how they are insured
Common mistakes when comparing quotes
- Comparing premium without comparing deductibles
- Assuming the limit alone explains the price difference
- Ignoring whether defense costs erode the limit
- Using a quote from a different discipline as a benchmark
- Overlooking that the contract may require a specific limit structure
Related questions
How much does professional liability cost for a small engineering firm?
It varies with billings, discipline, and claims history. Our article on structural engineer costs shows how these factors play out in practice.
Why did my quote for higher limits jump so much?
Higher limits may need different carrier capacity or excess coverage, and underwriting can tighten at larger limits.
Is $3 million required for most contracts?
No. Requirements vary by client and project, so review the contract language directly.
Can I lower the premium without lowering the limit?
Sometimes, through a higher deductible or different policy structure. Each change has tradeoffs for how a claim would be handled.