Update: When Window and Door Replacements in Threshold Buildings Require Special Inspection

The Rules Just Got Clearer, and for Many Boards, Simpler

In April we covered Binding Interpretation 318, the January 2026 ruling from the Florida Building Commission, the Florida Department of Business and Professional Regulation, and the Building Officials Association of Florida stating that window replacement constitutes a modification of a building's structural system and must therefore comply with Section 110.8.1 of the Florida Building Code, Building, 8th Edition (2023). That interpretation raised immediate questions across the industry: does every window and door swap in a threshold building now require a structural inspection plan and Special Inspector oversight?

The Florida Building Commission has now answered. Two declaratory statements, DS 2026-024 and DS 2026-025, were issued in response to questions submitted by Paul Zillio of Bliss & Nyitray Inc., and they draw a much clearer line between projects that require special inspection and projects that do not. For many condominium associations planning straightforward replacement projects, this is welcome news.

A Quick Refresher: What Is a Threshold Building?

Under Florida Statute 553.79, a threshold building is any building greater than three stories or 50 feet in height, or an assembly occupancy building exceeding 5,000 square feet with an occupant content of more than 500 persons. In practice, most mid-rise and high-rise condominiums in Florida qualify. Threshold buildings carry enhanced structural inspection requirements because the consequences of a structural failure are so much greater in taller, larger buildings.

New Construction: DS 2026-024

The first declaratory statement addresses windows and doors in new construction of threshold buildings. The question was whether Section 110.8.1 requires window inspections to be listed as a mandatory inspection in the structural inspection plan for a new building.

The Commission's answer puts the decision where it has always belonged: with the design professional of record. The structural inspection plan for a threshold building must be prepared by the engineer or architect of record and reviewed and accepted by the enforcing agency. Whether impact windows belong in that plan depends on whether they are part of, or critical to, the structural system or load path, as determined by the engineer or architect of record and subject to acceptance by the enforcing agency.

In other words, there is no automatic mandate to inspect every window in new threshold construction. The engineer or architect of record evaluates the role the windows play in the structural system and scopes the inspection plan accordingly, and the building department signs off on that judgment.

Existing Buildings: DS 2026-025

The second declaratory statement is the one most condo boards have been waiting for. It arose from a real project on an existing 12-story multi-family building that involved replacing windows with non-impact-resistant windows in the same rough openings, along with replacing doors and louvers. The petitioner asked directly: does Binding Interpretation 318 require inspection of these replacement windows, doors, and louvers?

The Commission's answer was no. In its words:

The replacement of impact-resistant and nonimpact-resistant windows, doors, and louvers with equivalent products within the same rough openings, where no structural members are modified, does not constitute work that modifies the structural system or structural loading of the building.

Because the work does not modify the structural system, it does not require special inspection under Section 110.8.1. The key conditions are worth reading carefully: the replacements must be equivalent products, they must go into the same rough openings, and no structural members may be modified. If your project meets all three conditions, the threshold building special inspection requirements do not apply.

What Still Triggers the Threshold Requirements

The exemption is narrow by design, and boards should not read it as a blanket pass for every window project. If your project enlarges or relocates openings, cuts or alters structural framing, modifies concrete or masonry around the openings, or changes the way loads travel through the wall, you are back inside Section 110.8.1 territory, and a structural inspection plan and Special Inspector oversight are required. Projects on aging coastal buildings frequently uncover deteriorated framing, corroded embeds, or concrete damage at the openings once the old units come out, and repairs to those structural elements can change the character of the project. A replacement that starts as like-for-like can become structural work mid-project.

It is also important to remember what the declaratory statement does not change. Replacement windows and doors still require permits. They still must meet current product approval, design pressure, and wind-borne debris requirements for your location. And the building envelope around them still has to manage water, which in our experience is where replacement projects most often go wrong. A flawless window installed over a compromised opening detail will still leak, which is why we recommend that boards treat any large replacement project as an opportunity for envelope evaluation and field water-penetration testing, particularly on buildings with a history of water intrusion or stucco and facade issues at the openings.

What Your Board Should Do Now

If your association shelved or re-budgeted a window or door replacement project earlier this year because of Binding Interpretation 318, it is worth revisiting the scope with your engineer. Start by having the design professional confirm in writing whether the project qualifies as an equivalent-product, same-opening replacement with no structural modification. If it does, your permitting path just got simpler and your inspection budget likely got smaller. If it does not, plan for the structural inspection plan and Special Inspector requirements from the outset rather than discovering them at permitting.

For projects already underway, coordinate with your engineer and your local building department before changing course. Local officials will be applying these declaratory statements to projects in their queue, and a short conversation now can prevent a stop-work surprise later. Contractors bidding replacement work on threshold buildings should scope their bids around the same three-part test and flag any structural repairs discovered during removal as a potential change in the project's inspection requirements.

How CSI Can Help

CSI's engineers hold the Special Inspector certifications that threshold buildings require when a project does trigger Section 110.8.1, and we handle the envelope evaluation, moisture mapping, and field water-penetration testing that protect replacement projects regardless of their inspection classification. We can review your project scope against the new declaratory statements, confirm whether special inspection applies, and provide the oversight that keeps the work compliant and watertight.

Source: Florida Board of Professional Engineers (FBPE), "Update: Window, Door Replacements in Threshold Buildings," by William Bracken, PE, FRSE, SI, published July 10, 2026. Based on Florida Building Code Binding Interpretation Report Number 318 and Florida Building Commission Declaratory Statements DS 2026-024 and DS 2026-025.