Architecture Firms need professional liability, also called Errors and Omissions (E&O), first, then general liability, cyber liability, a business owners policy once there is an office or equipment, and workers compensation at the first hire. Everything else is driven by client contracts. Who this is for: Architecture firms who bill clients for a drawing set, a specification, or a field report.
The short version
- Professional liability is the first policy a architecture firm should buy, not the last.
- General liability does not cover a claim about the quality of your work, and errors and Omissions does not cover a visitor tripping in your office.
- Expect a total starting program in the $3,200 to $16,160 range for a small firm.
- Client contracts, not the law, are what usually force limits up to $2M to $5M per claim for institutional and public work, with project specific policies on larger jobs.
- Cyber belongs in the core stack now because you hold project models.
The core stack for architecture firms
Almost every architecture firm we quote ends up with the same four or five policies. The mix moves with headcount, office space, and what your client contracts demand, but this is the starting point.
| Coverage | What it actually pays for | Typical limit | Typical premium |
|---|---|---|---|
| Professional liability, or errors and Omissions | Claims that your work, advice, or a drawing set, a specification, or a field report cost a client money | $1M per claim / $1M aggregate, sometimes with a project specific excess | $2,500 to $18,000 a year |
| General liability | Someone gets hurt or something gets damaged at your office or a client site | $1M per occurrence / $2M aggregate | $700 to $2,200 a year |
| Cyber liability | A breach, ransomware event, or funds transfer fraud involving project models | $1M, with $250K to $1M sublimits inside it | $900 to $3,500 a year |
| Business owners policy | Your office contents, laptops, and business income if you cannot operate | Contents at replacement cost | $1,000 to $2,800 a year |
| Workers compensation | Employee injury and illness, required in nearly every state at the first hire | Statutory, with $1M employers liability | $600 to $2,600 a year |
Premiums above are ranges for firms in the small to midsize band. Carriers rate architecture firms on gross billings, project types, and the share of work that is construction administration, so two firms with the same headcount can price very differently.
Why professional liability comes first
For architecture firms, the expensive claim is almost never a slip and fall. It is a client saying your work cost them money. That claim lands on the errors and Omissions policy, not on general liability, and it is the one coverage a architecture firm should never go without.
The three things we see trigger it most often in your line of work:
- A dimensional conflict between the structural and architectural sets.
- A specified roofing assembly that failed an energy code review after permit.
- An accessibility non-compliance found at final inspection.
General liability will not respond to any of those. It covers bodily injury and property damage to third parties, which is a different problem entirely. You need both, and they are not substitutes.
What your contracts will force you to buy
Even firms that would rather run lean end up buying coverage because a client demands it. For architecture firms that pressure comes from the standard American Institute of Architects owner architect agreement (form B101), public bid requirements, developer and lender requirements, and design build teaming agreements.
The requirements we see most often are $1M per claim / $1M aggregate, sometimes with a project specific excess in professional liability, $1M per occurrence in general liability, workers compensation at statutory limits, and increasingly a $1M cyber liability requirement. Larger buyers ask for $2M to $5M per claim for institutional and public work, with project specific policies on larger jobs.
What changes as you grow
| Moment | What it changes |
|---|---|
| First employee | Workers compensation becomes mandatory in nearly every state, and Employment Practices Liability Insurance (EPLI) starts to make sense |
| First office or coworking desk | Contents, business income, and a general liability requirement from the landlord |
| First enterprise client | Higher limits, additional insured status, primary and non contributory wording, and a certificate on demand |
| First subcontractor | You now own their mistakes unless your contract and their insurance say otherwise |
| First design work for a project built abroad | Territory wording on your errors and Omissions policy needs a real look |
What you can usually wait on
Not everything needs to be bought in year one. Directors and officers coverage generally matters once you have firms with multiple principals, a buy sell agreement, or an employee ownership plan. Employment practices liability becomes urgent around your fifth to tenth employee. Commercial auto in your own name is only needed once the business owns a vehicle, though site visits during construction administration creates a hired and non owned exposure well before that.
What this looks like in practice
Illustrative example. Numbers are typical of claims we see and are not a promise of how any specific claim would be handled.
The setup: A architecture firm with a handful of staff carrying $1M per claim / $1M aggregate, sometimes with a project specific excess in professional liability.
The claim: The matter started with a dimensional conflict between the structural and architectural sets. The contractor claimed $310,000 in rework and delay.
The cost: $58,000 in defense costs and $190,000 in settlement, $248,000 in total, paid inside the policy limit after the retention.
The lesson: The claim was a professional error, so only the errors and Omissions policy responded. A general liability policy alone would have left the firm paying the whole thing out of pocket.
Frequently asked questions
Q: What is the single most important policy for a architecture firm?
Professional liability. It is the coverage that answers the claim your business actually generates, which is a client alleging your work cost them money. General liability is important, but it will not respond to a professional error.
Q: Can I put it all on one policy?
Often yes. Many carriers package general liability, property, and professional liability for architecture firms into a single policy with one bill and one renewal date. Packaging usually saves money, but check that the professional liability limit is separate and not shared with the general liability aggregate.
Q: How much does a full starter program cost?
For a small architecture firm, a professional liability plus general liability plus cyber program commonly lands between $3,200 and $16,590 a year in total. The spread is driven by revenue, services performed, and claims history.
Q: Do I need workers compensation if it is just me?
In most states, a sole owner with no employees can exclude themselves. Two cautions: your clients may still require a policy on the certificate, and if you use 1099 help who are not properly insured, an audit can treat them as employees.
Q: Does a business owners policy include professional liability?
No. A business owners policy bundles property and general liability. Professional liability is a separate coverage part or a separate policy, and it is the one that matters most for architecture firms.
Q: What limits do most architecture firms buy?
$1M per claim / $1M aggregate, sometimes with a project specific excess is the common starting point, and firms move to higher limits when a contract requires it or when a single engagement is large enough that the limit would not cover a bad outcome.
How Morrow helps architecture firms
Morrow is a licensed independent commercial insurance brokerage that specializes in architecture firms. Building the right coverage stack for a architecture firm is exactly the kind of question we answer every week, and because we place this coverage every day we know which carriers write it well, which forms are broad, and which contract language actually needs an endorsement behind it.
- We read the contract clause and tell you what your current policy already does and does not do.
- We market your account to carriers that have real appetite for architecture firms rather than whoever answers first.
- We issue certificates the same day a client asks, with the endorsements listed correctly.
- We stay on the file at renewal so limits, retroactive dates, and contract requirements do not quietly drift.
Get in touch and we will see how we can help. Tell us what you do, send over any contract that is driving the requirement, and send us the question and we will tell you where you stand. Start at morrowinsure.com or reach the team through the contact options on that page.
One more thing. This article is general information for architecture firms and is not legal advice, tax advice, or a statement of coverage. Policy wording controls in every case, and forms vary by carrier and by state. Have a licensed advisor review your own policy and your own contract before you rely on any of it.
Last updated: Reviewed by the Morrow commercial lines team. Last updated August 2026.