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Professional Services
Design claims arrive years after the building opens. Your program has to last as long as the risk.
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An architect in Canada needs professional liability (E&O) for design errors first, and in Ontario it is mandatory: Regulation 27 under the Architects Act requires a per-claim limit of $250,000, $500,000 or $1,000,000 based on the previous year's fees, placed with Pro-Demnity unless exempt. Around that core, a practice needs excess limits for large projects, general liability for site visits, cyber, an office package and a plan for claims that arrive years after completion.
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Architects carry one of the longest tails in professional liability. A detail drawn today can lead to a claim a decade after occupancy, usually through a contractor or owner who names everyone on the project. In Ontario, E&O is mandatory under the Architects Act, placed with Pro-Demnity at a minimum limit set by your fees, and that is only the floor. RFPs and institutional clients regularly ask for more. See our professional liability guide for how claims-made cover works.
We build the program around your mandatory E&O: commercial general liability for site visits, cyber for drawings and client data, an office package with business interruption, and a plan for excess limits as projects grow. We read client agreements before you sign and issue certificates as projects start. The wider picture for advice-based firms is on our business and professional services page.
This page is for architectural practices: sole practitioners, partnerships and corporations that hold a certificate of practice, and the architects they employ. The general picture for advice-based firms sits on our business and professional services page. This page covers what is different about design work that gets built.
Three things set architects apart. In Ontario the core policy is mandatory and comes from one insurer. Claims arrive late and usually name every consultant on the project. And RFPs keep asking for higher limits than the mandatory floor.
Most practices carry five or six policies. The gaps between them are where firms get caught.
| Coverage | What it answers | Notes for architects |
|---|---|---|
| Professional liability (E&O) | Allegations that a design, specification, drawing or contract administration decision was negligent and caused a loss | Mandatory in Ontario through Pro-Demnity. Claims-made, so continuity and prior acts matter |
| Excess or increased limits | Projects and RFPs that require more than the mandatory per-claim limit | Arranged above the annual practice policy, for the practice or for a single pursuit |
| Commercial general liability | Bodily injury and property damage, such as a fall during a site visit or damage to a client's building | E&O does not cover a slip on site. Clients and landlords ask for CGL certificates |
| Cyber liability | Ransomware, a breach of client files, or fraud that diverts a fee payment | BIM models, drawings and client data all sit on servers and cloud platforms |
| Office package with business contents | Computers, plotters, models, records and leasehold improvements, plus lost income after a fire or flood | Include laptops and tablets taken to site and to client meetings |
| Directors and officers and employment practices | Claims against the firm's principals for management decisions, and claims by employees | Relevant once the practice has partners, a board or a growing staff |
| Non-owned commercial auto | Liability when staff drive their own cars to sites and meetings | Their personal policy pays first, but the firm can still be named |
Section 48 of Regulation 27 under the Architects Act requires every member of the Ontario Association of Architects and every holder of a certificate of practice to be insured against errors and omissions in architectural services. The insurer is the one referred to in the Act, Pro-Demnity Insurance Company. The minimum limit per claim is tied to the gross fees charged for architectural services under the certificate in the previous financial year.
| Gross architectural fees in the previous financial year | Minimum limit per claim |
|---|---|
| Over $1,000,000 | $1,000,000 |
| Over $500,000, up to $1,000,000 | $500,000 |
| $500,000 or less, or no previous financial year | $250,000 |
The regulation also sets out exemptions. Architects employed by the Ontario or federal Crown, a municipality, a school board or private school, or by a business that does not hold a certificate of practice, are exempt in their capacity as employees. Some holders are exempt from the Pro-Demnity requirement, including a holder with no office in Ontario. Those holders must still carry E&O with a limit of at least $250,000 per claim, and must apply for the exemption every year.
Outside Ontario, each provincial association sets its own rules, and some leave insurance to the firm and its clients. Check with your association before assuming the Ontario model applies. If you practise in more than one province, tell us where each project is, because the coverage has to follow the work.
A practical point: we do not replace the mandatory Pro-Demnity policy for an Ontario practice. Our job is the program around it, and checking that each contract's insurance schedule fits what you carry.
The mandatory limit is a floor. A practice billing $600,000 a year needs only $500,000 per claim by law, yet a single institutional RFP can ask for $2,000,000 or more. There are several ways to close the gap.
Defence costs matter when you choose a limit. Check whether they sit inside or outside the limit on each layer. Our professional liability guide explains how defence inside limits erodes what is left for a settlement.
Design errors often show up after occupancy: water getting through an envelope, a failed roof assembly, an accessibility shortfall, a fire separation that was never right. Ontario's Limitations Act, 2002 sets a basic limitation period of two years from the day a claim is discovered and an ultimate limitation period of 15 years from the act or omission. For an architect, the clock on discovery can start many years after the drawings were issued.
Section 18 of the Act deems a claim for contribution and indemnity, where one defendant brings another party into the suit, to arise on the day the first defendant was served. Pro-Demnity has argued that this should not let a contractor or owner pull in an architect for work more than 15 years old. In Lower William Properties v. Santaguida, 2026 ONCA 581, released August 13, 2026, the Court of Appeal for Ontario overturned a lower court ruling that had allowed such a third party claim against the architect of a 2001 renovation. But the court did not finally decide whether the 15-year limit applies to every kind of contribution claim. Until it does, assume old projects can still come back.
Treat E&O as a career-long policy: keep it continuous, keep project files, and report circumstances as soon as you know of them.
These hypothetical examples show which policy responds, not what a claim would cost.
| Scenario | Allegation | Policy that responds |
|---|---|---|
| Six years after a mid-rise condo is occupied, units suffer water damage at window openings | Detailing of the envelope and window interface was negligent | E&O; the condo corporation typically sues the builder, who then claims against the architect |
| A school addition fails a code review and needs redesign during construction | Errors in code analysis caused delay and extra cost | E&O, for the redesign cost and the contractor's delay claim |
| An architect certifies a progress payment for work later found defective | Negligent contract administration | E&O; certification and site review are professional services |
| A project architect trips over materials during a site visit and the owner's property is damaged by a dropped tablet case | Bodily injury to your own employee goes to workers' compensation; damage to the owner's property is a liability claim | CGL for the property damage; your WSIB or provincial workers' compensation coverage for the employee |
| A spoofed email from the firm tells a client to send the next fee instalment to a new bank account | The client says your compromised email caused its loss | Cyber, including social engineering cover if purchased |
The pattern is consistent. Design and administration claims go to E&O, physical injury and damage go to CGL, and data and payment fraud go to cyber. Our post on CGL vs. professional liability sorts other common claims.
Architects sit between two sets of contracts. Your agreement with the client sets your scope, your liability and the insurance you must carry. The construction contract between the owner and the contractor, which you often administer as consultant, sets the contractor's insurance, and you are frequently the one asked to collect its certificates.
Our post on why every contract asks for a certificate of insurance explains each request. For the contractor side of the project, see our construction and contractors package.
Because E&O is claims-made, closing a practice does not end the exposure. In Ontario, Pro-Demnity runs a Retirement from Practice program. According to Pro-Demnity, once the certificate of practice is surrendered and the annual practice policy expires, it provides continuing cover for claims about past work at no premium, with limits of $250,000 per claim and $500,000 in aggregate and defence costs in addition. It covers the architect for life and the estate for up to six years after death. Eligibility requires at least two years with Pro-Demnity and all premiums, levies and deductibles paid.
There are limits. The program does not apply if you keep providing architectural services, and an architect who joins another firm as a director, officer, partner, shareholder or supervising architect must buy prior acts cover instead. If your practice carried higher limits, Pro-Demnity may quote an excess policy above the retirement limits.
In Ontario the mandatory E&O premium is set by Pro-Demnity. The rest of the program is priced by the insurers we compare, and each one rates on the same broad factors.
Conditions currently favour buyers. Marsh's Global Insurance Market Index put Canadian financial and professional lines rates down 4% in the third quarter of 2026. It is a reasonable time to raise thin limits.
Ready to compare the coverages around your E&O? Request a quote, or see how we combine policies on bundle and save.
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This page is general information, not insurance or legal advice. Coverage depends on your policy wording and the insurer. Speak with a licensed broker about your situation.
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