What is a frame gap exclusion in builder's risk insurance?

If you've underwritten enough wood-frame multifamily or mixed-use jobs, you've run into the term even if your form doesn't use it by name. A frame gap exclusion (sometimes written as a frame-only exclusion, sometimes buried in an endorsement titled something duller) is language that limits or carves out coverage during the stretch of a vertical build when the structure is framed but not yet enclosed.

That stretch is the part of the schedule carriers worry about most. Studs are up, sheathing may or may not be on, there's no roof membrane, no active sprinkler system, no fire-stopping between floors. A single ignition source, a dropped cigarette, a space heater, an electrical short from temporary power, can move through an open frame in minutes with nothing to slow it down. Underwriters have seen the loss photos. The frame stage is where total-loss fires in large wood-frame projects tend to happen, and it's the period insurers are least willing to take on full limits without conditions attached.

What the exclusion does

The mechanics vary by form, but the pattern is consistent. Some policies exclude fire or named perils entirely while the building is in "frame" status, defined as framed but not dried-in or weathertight. Others don't exclude the peril outright but attach a sublimit, a tighter deductible, or a requirement that the insured notify the carrier (and sometimes pay an additional premium) once the project crosses from frame into enclosed status. A few forms tie the exclusion to a hard day count, so many days past the framing permit without evidence of enclosure and coverage for that period is reduced or voided.

The common thread: the exclusion is written around a milestone, not a calendar date. "Enclosed," "dried-in," and "weathertight" are the terms doing the work, defined by what's physically on the building at a given point in the schedule.

Why that's a problem when the only update is a contractor's word

Here's where it gets practical for claims and renewal underwriting both. The trigger for the exclusion is a construction milestone, but the only record most carriers have of when that milestone happened is a monthly progress narrative from the contractor or GC, usually written to support a draw request, not a coverage determination. A contractor has every incentive to report ahead of schedule on a draw schedule and no particular incentive to flag that the building sat in open-frame status six weeks longer than planned because of a steel delay or a labor shortage.

That gap between what's reported and what's actually standing on site is exactly the exposure the frame gap exclusion was written to manage, and it's the same gap that makes the exclusion hard to enforce after a loss. If a fire hits during what the policy calls the frame period, the carrier needs to show the building was in fact unenclosed on that date. If the insured's file only has monthly percent-complete numbers from the builder, that's a thin record to argue from either direction.

Documenting the frame stage independently

A dated image of the roof deck beats a contractor's percent-complete line every time a frame gap question comes up at renewal or in a claim. Builder's Risk Monitor exists for that gap specifically. It reads stage of completion from repeat aerial imagery each month and files it against the policy, so a frame gap question can be checked against a dated image of the roof deck, sheathing, and envelope instead of a contractor's progress percentage.

If you're scheduling a course-of-construction risk through a long frame period, it's worth asking what your file will show if the frame stage runs longer than the schedule assumed, because the policy language is already written around that answer. Worth a look if that's a gap you're carrying on current projects.