When You Need Professional Liability Insurance on a Construction Project
Who needs professional liability insurance? Most homeowners know their contractor should carry commercial general liability insurance (CGL). Fewer know that CGL won’t cover everything. Design-related failures on your project may fall into a gap that leaves you holding the cost of fixing them.
Depending on the type of project you’re undertaking — new construction, remodel, or renovation — professional liability insurance may be a coverage you need to understand, verify, and potentially secure before work begins.
What Is Professional Liability Insurance?
Professional Liability Insurance covers claims arising from actual or alleged errors and omissions (E&O). Also negligence, breach of duty, or misleading statements resulting from professional design services. Think of it as the construction industry equivalent of malpractice insurance for doctors or dentists.
For architects, engineers, and design-build contractors, this coverage addresses situations where there is a design flaw. That means the design caused a system or element of your project to fail to perform as intended. Most policies cover both the cost of defending a claim — attorney fees, court costs — and any resulting settlements or judgments.
Why This Matters for Homeowners
When you hire a licensed architect to design your project, they should carry their own Professional Liability policy.
The problem is that many homeowners skip the architect entirely. Instead, they go directly to a contractor or subcontractor who offers in-house design services. In that scenario, design liability coverage is not standard — and may not exist at all.
If your contractor is performing both design and construction, what you want them to carry is Contractors E&O insurance. This is a form of errors and omissions coverage specific to contractors who provide in-house design services. Without it, a design failure on your project may have no insurance coverage behind it.
What Counts as a Faulty Design?
Faulty design claims apply when work your contractor designed and installed does not perform as promised in your original contract. This is the same whether on a new build, renovation, or remodel.
Importantly, this applies in situations where the failure doesn’t result in property damage or bodily injury. Those situations are covered under the contractor’s Commercial General Liability (CGL) policy. Professional Liability fills the gap when there’s a performance failure but no physical damage or injury.
A straightforward example: an HVAC system is designed and installed by your contractor. The ductwork, however, is undersized for the space it needs to condition. Or the connections are improperly made.
The system consistently fails to heat or cool the area as designed. No property has been damaged and no one has been injured — but the system doesn’t work. It needs to be redesigned and reinstalled.
In this scenario, your contractor’s CGL policy won’t cover the cost of fixing it. That cost falls to you — unless Professional Liability or E&O coverage is in place.
One important distinction worth understanding: Professional Liability covers poor design. It does not cover poor workmanship alone. If the design was sound but the installation was sloppy, that’s a workmanship issue. No insurance policy covers that directly. Your recourse there is through your contract and the contractor’s warranty obligations.
Your Time Limit for Making a Claim
Most Professional Liability Insurance policies are written on a “claims made” or “claims made and reported” basis. This means any claim you make for faulty design must be filed within the active policy period — not just within a general statute of limitations.
This makes it critical to obtain proof of your architect’s or contractor’s coverage before you sign a contract. The certificate of insurance will show you the policy period — the window during which a claim must be made.
If you discover they carry no coverage, that’s the moment to either secure your own Professional Liability Insurance policy or reconsider who is doing the design work on your project.
What Professional Liability Coverage Limit Is Enough?
The limit of liability on your contractor’s or subcontractor’s Professional Liability policy depends. It should be equal to the estimated cost of having the work entirely redone at today’s prices. Let’s say the HVAC system in the example above would cost $40,000 to redesign and reinstall. The policy limit should cover at least that amount. For larger or more complex projects, set the bar accordingly.
The Bottom Line
Before signing any contract that includes design services — whether from an architect, engineer, or design-build contractor — ask for proof of Professional Liability Insurance. Or E&O coverage and confirm the policy period, and verify the coverage limit is proportionate to the scope of work. It’s a straightforward step that closes a gap most homeowners don’t know exists until it’s too late.
