Builders Risk Water Damage and the LEG Defects Clauses in 2026

The Loss That Defines the Placement

Fire makes the headlines, but water writes the checks. Loss data compiled in early 2026 attributes roughly 30 percent of all builders risk payouts to water damage, against an estimated $16 billion in annual water losses across U.S. construction. Marsh underwriters point to plumbing failures—a cracked fitting, an open riser, a temporary line left charged overnight—as among the leading causes of builders risk claims. Fire and smoke have building codes; water, on an active jobsite, has none. That gap is where the exposure lives.

For contractors, water is no longer a line item carriers tolerate—it is the exposure they underwrite around. Knowing how your course-of-construction policy responds when water follows a defect, and what the carrier now expects you to control, separates a covered loss from a six-figure surprise.

What the LEG Defects Clauses Actually Do

Most builders risk and course-of-construction forms handle faulty work through one of the London Engineering Group’s model defect exclusions—LEG 1, LEG 2, or LEG 3. LEG 1 is the broadest exclusion and the narrowest cover: it removes all loss or damage arising from defective workmanship, materials, or design, including the damage that flows from the defect. LEG 2 is the common middle ground, excluding only the cost that would have been incurred to put the defect right immediately before the damage—the resultant damage itself stays covered.

LEG 3 is the widest cover, at a higher premium or excess, excluding only the cost of improving on the original design, materials, or workmanship. The distinction is not academic: when a defective pipe joint fails and floods three finished floors, LEG 2 and LEG 3 respond to the water-damaged drywall, finishes, and systems, while LEG 1 can leave you arguing that the flood was separable from the defect that caused it.

Resultant Damage and the 2026 LEG Revision

These clauses carry real weight on old wording—the original LEG language dates to 1996 and was last revised in 2006—and courts on both sides of the Atlantic have strained to apply them. In late June 2026, LEG chairman Charlie Dee confirmed the group is drafting revised clauses for publication by the end of summer, after recent decisions exposed ambiguity over what counts as “damage,” what is actually excluded, and, under LEG 3, what counts as an “improvement.” The English Court of Appeal in Sky UK v Riverstone framed damage as a physical change that impairs a property’s value or usefulness—a definition likely to shape the next generation of wording.

The discipline for contractors is to read the actual clause number and its resultant-damage language on every project. A revised clause on a 2026 renewal may not behave like the version on last year’s job.

Deductibles and Sublimits Have Moved

Even where the clause covers resultant water damage, the deductible decides how much of it reaches the carrier. A few years ago, water deductibles commonly sat between $25,000 and $50,000. In 2026, first-incident water deductibles of $150,000 to $250,000 are routine, and on large projects underwriters describe water deductibles of $500,000 to $1 million—with repeat claims capable of exceeding $1 million on their own. Brokers also report tighter sublimits for non-weather water losses even as base premiums hold roughly flat.

These figures are not fixed. The H1 2026 market has shown genuine flexibility—water-damage deductible buy-downs are readily available, and residential placements have seen rate reductions of 15 to 30 percent. The leverage belongs to the contractor who can demonstrate control over the peril the carrier fears most.

The Move to Water-Mitigation Warranties

That is the real story of 2026: carriers are pricing—and, increasingly, conditioning—coverage on jobsite water controls. Underwriters now ask, before binding, how temporary water systems are isolated, whether overnight monitoring exists, and how fast a shutoff protocol can run. Insurers including Shepherd have begun offering reduced water deductibles and premium credits for projects running leak-detection and automatic-shutoff platforms, with deductible reductions of 50 percent or more where the technology is deployed and kept active. Zurich underwriters describe active controls as the difference between a $2 million and a $1 million water deductible on a large project, while Munich Re Specialty reports that monitoring can pull a maximum foreseeable loss estimate from $20 million down to roughly $1 million.

Adoption on large building projects is approaching half, and the direction is set. Expect carriers to move from rewarding monitoring to requiring it—and to verify the system stayed active through construction, not merely that it was installed at kickoff. A warranty satisfied at install but allowed to lapse mid-project is a coverage gap waiting to surface.

Keeping the Coverage Intact

Water damage will remain the leading builders risk loss driver, so the coverage mechanics and the jobsite controls have to be managed together—not bound once and filed away. This is where our 4-Step Strategic Process does the work: Strategic Discovery surfaces which LEG clause and water sublimit actually sit on each project; Risk Assessment illuminates the deductible and the controls the carrier will expect; Solution Design crafts the placement and warranty terms around how you build; and Ongoing Optimization confirms the shutoff protocols and monitoring stay active through completion. Carry the torch on that detail, and the coverage you paid for responds when a line lets go.

— Ryan Mefford, President & Risk Advisor