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Boston, MA Building Safety: Door Locking Hardware (2026)

Significant Restrictions
Compiled from the official code textEditor Martyn O'NeillLast verified August 2026

Key Facts

Enforcing agency
Inspectional Services Department
Opening size threshold
Over 1 sq. ft., under 8 ft. high
Approved materials
Steel plates, mesh grates, lexan, concrete block
Compliance deadline after notice
30 days
Weekly maintenance fine
Up to $300 per week

Summary

Boston requires every vacant, unguarded building open to unauthorized entry to have all door and window openings closed and secured, with chronically-violated properties needing certified security hardware like steel plates or mesh grates. Noncompliance is a $300-a-week fine.

When a building is vacant, unguarded and open to unauthorized entry, all building openings must be closed, secured and protected as follows. ... Every opening larger than one square foot in area that is located less than 8 feet above the ground or that is accessible from ground level or within 8 feet in any direction of an exterior stairway, fire escape or other means of access shall be secured using practices and materials approved by the Inspectional Services Department and the Office of the City Fire Marshal, including, but not limited to, stainless steel plates or shutters, steel mesh grates, lexan panels and concrete blocks.

Source: Massachusetts State Building Code (780 CMR)View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: 2026 S-2: Current through Ordinance 2025 C. 14, passed 11-5-2025).

Full Breakdown

4(C) requires that when a building is vacant, unguarded and open to unauthorized entry, all building openings must be closed, secured and protected in a manner not inconsistent with Inspectional Services Department rules for securing vacant buildings. 4(C)(2)(a), every opening larger than one square foot that sits less than 8 feet above ground, or within 8 feet of an exterior stairway or fire escape, must be secured using materials approved by the Inspectional Services Department and the Office of the City Fire Marshal, specifically naming stainless steel plates or shutters, steel mesh grates, lexan panels and concrete blocks.

4(C)(2)(b) as having a permanent, secured door or window in each opening with all components, frames, jambs, rails, sashes, panes, intact and unbroken; a building failing that standard is "violated," and it becomes a violation of the Section for a previously-certified unviolated building to become violated. The Commissioner sends written notice by certified mail to the on-site manager, the sign-posted agent for service, or the owner of record, and the owner then has 30 days to comply. 4(B) also requires a posted sign giving 24-hour contact information for the responsible manager and the owner's agent for service of process.

Violations & Fines

Under § 16-52.6, failing to properly secure and maintain a registered vacant property is punishable by a fine of up to $300 for each week the property is not maintained; failing to initially register with the Commissioner, or to properly identify the local responsible individual or management company, is a separate $300 fine. All funds go to the Inspectional Services Department Enforcement Fund, and an aggrieved owner may appeal administratively to Inspectional Services and then to court under § 16-52.7.

Frequently Asked Questions

Does Boston require vacant buildings to have their doors and windows secured?
Yes. Section 16-52.4(C) requires that when a building is vacant, unguarded and open to unauthorized entry, all openings must be closed and secured per Inspectional Services Department rules, with certified security hardware required for chronically violated properties.
What counts as an "unviolated" vacant building under Boston's rule?
Section 16-52.4(C)(2)(b) defines it as a building with a permanent, secured door or window in every opening, with all frames, jambs, rails, sashes and panes intact and unbroken; failing that makes the building "violated."
What happens if my vacant Boston property isn't secured?
Under § 16-52.6(C), failure to maintain the property is punishable by a fine of up to $300 for each week it remains unmaintained, with funds directed to the Inspectional Services Department Enforcement Fund.
How long do I have to fix a vacant building security violation in Boston?
Section 16-52.4(C)(2)(c) gives the owner 30 days from the mailing of the Commissioner's certified-mail notice of violation to bring the building back into compliance.

Sources & Official References

Other rules in Boston

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