California Balcony Law (SB 721 & SB 326)

Inspection requirements for balconies, decks, and walkways on multi-unit residential buildings

Last updated: April 3, 2026

Overview

In June 2015, a balcony collapsed at an apartment building in Berkeley, California, killing six people and injuring seven others. The cause was dry rot in the wood joists supporting the balcony. The rot had been building for years, hidden behind the waterproof membrane, with no inspection requirement that would have caught it.

California responded with two laws that now require periodic inspections of exterior elevated elements (balconies, decks, stairways, walkways) on multi-unit residential buildings. SB 721, signed in 2018, covers apartment buildings with three or more units. SB 326, signed in 2019, covers condominiums governed by HOAs. Together, these laws apply to millions of housing units across the state.

The goal is straightforward: find structural problems before they become life-threatening. Water intrusion, wood rot, and corroded connectors are the primary concerns. If an inspection finds damage, the building owner or HOA must repair it within specified timelines.

Deadline update: The initial inspection deadline for both SB 721 and SB 326 was January 1, 2025. Many buildings are still catching up due to inspector availability. If your building has not been inspected yet, schedule an inspection as soon as possible to avoid penalties.

SB 721 vs SB 326

These two laws cover different building types and have different rules for who can perform the inspection. The most important distinction: SB 721 covers apartments, SB 326 covers condos. If you are not sure which applies to your building, the ownership structure determines it. Rental apartments fall under SB 721. HOA-governed condominiums fall under SB 326.

Factor	SB 721	SB 326
Applies to	Apartments (3+ units)	Condos (HOA-governed)
Who inspects	Architect, engineer, or contractor	Architect or engineer only
Who is responsible	Building owner	HOA board
Initial deadline	January 1, 2025	January 1, 2025
Inspection cycle	Every 6 years	Every 9 years
Reporting	Report to building owner	Report to HOA board + local enforcement

Tip: SB 326 has stricter inspector qualifications than SB 721. Under SB 326, only licensed architects and structural engineers can perform the inspection. Licensed contractors, even with A, B, or C-5 licenses, do not qualify for SB 326 inspections, though they do qualify for SB 721.

What Gets Inspected

Both laws target "exterior elevated elements" (EEEs) that extend beyond the exterior wall of the building and rely on wood or wood-based structural support. The element must also be designed for human occupancy or use, meaning it is a surface people walk on, stand on, or use as a pathway.

Specifically, inspectors evaluate these types of structures:

Balconies and decks
Exterior stairways and landings
Walkways and elevated corridors
Entry structures that project from the building
Railings and guardrails attached to any of the above

The inspection focuses on the structural components that keep these elements attached to the building and capable of bearing load. That includes joists, ledger boards, beams, posts, connectors, and fasteners. It also includes the waterproofing systems that protect those structural components from moisture: membranes, coatings, flashings, sealants, and drainage details.

If a building's exterior elevated elements are supported entirely by concrete, steel, or other non-wood materials, those elements may be exempt. However, many buildings that appear to have concrete balconies actually have wood-framed substructures beneath a concrete topping. A qualified professional should evaluate the construction before assuming an exemption.

Common Failures Found During Inspections

The majority of problems found during SB 721 and SB 326 inspections trace back to water getting where it should not be. Wood-framed exterior elements are exposed to rain, irrigation overspray, and standing water from poor drainage. Once moisture gets past the waterproofing layer, it starts breaking down the structural wood.

Water intrusion at deck-to-wall flashing

The transition where a deck surface meets the building wall is the most vulnerable point. Flashing that is improperly installed, deteriorated, or missing allows water to wick behind the wall cladding and into the framing. This is the single most common cause of wood rot in balcony structures.

Deteriorated joists and ledger boards

Joists carry the load of the deck. Ledger boards connect the deck to the building. When these members absorb moisture over years, they develop fungal decay (dry rot) that weakens them from the inside out. The surface may look fine while the interior is soft and crumbling.

Missing or failed waterproof membranes

Some older buildings were built without any waterproof membrane over the plywood deck substrate. Others had membranes installed that have since cracked, delaminated, or worn through from foot traffic. Either way, the plywood and framing below are absorbing water with every rain event.

Corroded metal connectors

Joist hangers, bolts, nails, and other metal connectors corrode when exposed to moisture, especially in coastal environments. Corroded connectors lose load-bearing capacity. In severe cases, the connection can fail completely.

Tip: For a deeper look at how waterproofing systems protect deck structures, see the deck waterproofing guide. For help choosing between coating types, see the deck coating options guide.

Repair and Remediation

When an inspection finds structural damage, repairs must be completed within the timelines set by the inspector. Conditions that pose an immediate safety threat require emergency repairs within 120 days. Less severe issues are addressed on a maintenance timeline before the next inspection cycle.

Most repairs involve some combination of replacing damaged wood, improving waterproofing, and upgrading connectors. The goal is to fix the damage and prevent it from recurring. Without addressing the source of water intrusion, new framing will rot the same way the old framing did.

Waterproofing coatings

Elastomeric deck coatings create a continuous waterproof layer over the walking surface. They bridge hairline cracks, resist UV exposure, and provide a slip-resistant finish. For deck surfaces that need waterproofing as part of a post-inspection repair, coatings tested under ICC-ES AC39 provide documented performance data for water penetration resistance, crack bridging, and weathering.

Joist protection

Protecting replacement joists from future moisture damage is critical. Joist tape, borate treatments, and proper ventilation all help extend the life of new framing. For more on protecting deck joists specifically, see the deck joist protection guide.

Flashing replacement

Since failed flashing is the leading cause of water intrusion at deck-to-wall connections, any repair scope should include flashing replacement or upgrade. Proper flashing integrates with the wall weather-resistive barrier and directs water out and away from the framing. This is the single most important detail to get right during a repair.

Important: If the inspection finds conditions that pose an immediate threat to safety, the inspector must notify the building owner or HOA in writing. Emergency repairs must be completed within 120 days. Failure to address emergency conditions can result in civil penalties and increased liability exposure.

Frequently Asked Questions

Does this apply to single-family homes?

No. SB 721 applies only to buildings with three or more dwelling units. SB 326 applies only to condominium developments with three or more units that are governed by an HOA. Single-family homes and duplexes are not subject to these inspection requirements.

What happens if I don't get the inspection done?

Local building departments can issue notices of non-compliance. Failure to complete required inspections can result in civil penalties ranging from $100 to $500 per day. Failure to repair emergency conditions carries additional penalties. Beyond fines, non-compliance creates significant liability exposure if a structural failure injures someone.

Who pays for the inspection and repairs?

For SB 721 buildings, the building owner pays for both the inspection and any required repairs. For SB 326 buildings, the HOA is responsible. Repair costs can be substantial when deferred maintenance has led to widespread wood decay. Some HOAs fund repairs through special assessments.

What is the difference between SB 721 and SB 326?

SB 721 covers apartment buildings with three or more units and allows architects, engineers, or licensed contractors to perform inspections. SB 326 covers condominiums governed by HOAs and restricts inspections to licensed architects and structural engineers only. SB 326 also has stricter reporting requirements, including filing reports with the local enforcement agency.

Can I waterproof my deck to prevent future failures?

Yes, and proactive waterproofing is the most cost-effective long-term approach. Elastomeric deck coatings create a continuous waterproof barrier over the walking surface. Proper flashing at wall-to-deck transitions prevents water from reaching the framing. Joist protection products guard the structural wood from moisture damage. Together, these measures significantly reduce the risk of the rot and decay that these inspections are designed to catch.