California Balcony Inspection Law (SB 721 & SB 326)

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

Last updated: April 22, 2026

Property owner or manager

Rental apartment building with 3+ units (SB 721). Step-by-step compliance, finding an inspector, and understanding your report.

Start here Already have a report? Read how to interpret it →

HOA board member

Condominium common-interest development (SB 326). Inspector qualifications, reserve-study coordination, and board communications.

Start here

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.

Where you stand in April 2026: both statutory deadlines have passed. SB 326's first inspection was due January 1, 2025 (Civil Code § 5551). SB 721's first inspection was due January 1, 2026 after AB 2579's one-year extension (Health & Safety Code § 17973). The focus now is completing overdue inspections, executing repairs (SB 721 imposes civil penalties of $100 to $500 per day when required repairs are not completed within 180 days of the notice), and planning the next cycle (6 years for SB 721, 9 years for SB 326). If you have not yet inspected, see the owner or HOA guide above.

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)
Statutory citation	Health & Safety Code § 17973	Civil Code § 5551 (Davis-Stirling)
Who inspects	Licensed architect, licensed civil or structural engineer, licensed building contractor (A, B, or C-5 with 5+ years' experience), or certified building inspector	Licensed architect, licensed structural engineer, or licensed civil engineer only (AB 2114, 2024). Contractors and certified building inspectors do not qualify.
Who is responsible	Building owner	HOA board
Initial deadline	January 1, 2026 (extended by AB 2579)	January 1, 2025
Inspection cycle	Every 6 years	Every 9 years (coordinated with reserve study under Civ. Code § 5550)
Reporting	Report to building owner	Report to HOA board + local enforcement
Penalty for non-compliance	$100–$500 per day after the 180-day repair window (HSC § 17973(i)(2))	Enforcement via local code agency and Davis-Stirling civil remedies; no statutory per-diem penalty

Tip: SB 326 has stricter inspector qualifications than SB 721. Under SB 326, only licensed architects, structural engineers, or civil engineers (added by AB 2114 in 2024) can perform the inspection. Licensed contractors (even with A, B, or C-5 licenses) and certified building inspectors do not qualify for SB 326, though both do qualify under SB 721.

If your building is mixed-use or a condominium with individually rented units, the governing statute follows the ownership structure. HOA-governed common-interest developments fall under SB 326 regardless of whether individual units are owner-occupied or rented out. See the SB 326 HOA board compliance guide for the board-level process.

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.

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.

Already have an inspection report in hand? See how to read an SB 721 inspection report: severity categories, the 180-day repair clock, and what requires emergency action.

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, the owner has a statutory clock to act. Under SB 721 (HSC § 17973(h)(2)), the owner has 120 days to apply for a permit for non-emergency repairs. The repair-completion timeline is then set by the inspector and local enforcement based on the severity of the finding. Civil penalties of $100 to $500 per day apply after a 180-day non-compliance window. Conditions that pose an immediate threat to safety are handled on a shorter emergency timeline set by the inspector and local code enforcement.

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. When scoping a repair bid, see the SB 721 balcony repair contractor bid guide for how to compare demolition extent, waterproofing spec, structural connectors, and warranty across bids.

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. Deck Flex W.M. (ESR-3672) is one example of a Class A–rated system with published evaluation-report data. If a different coating is proposed mid-project, see the SB 721 substitution process for balcony repair for equivalency documentation and approval workflow.

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, seams, and sealant detailing

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.

Flashing also has to actively protect what it covers. Plywood seams at panel joints, the solid blocking under deck-edge flashing, and the top of any wall sheathing that meets the deck plane are all entry points for water if seams are exposed during sequencing or not bridged with a continuous bead of compatible sealant. Specify T&G plywood (or H-clip-supported seams), solid blocking under every panel edge that meets a flashing or transition, and a continuous bead of manufacturer-compatible sealant at every flashing-to-substrate seam, fastener head, and inside corner before the membrane goes on. See the 2025 sealant & caulking guide for chemistry selection compatible with non-floating walking-deck membranes.

Important: If the inspection finds conditions that pose an immediate threat to safety, the inspector must notify the building owner or HOA, and within 15 days notify local code enforcement. Emergency-repair timelines are set by the inspector and local enforcement, not by a fixed statutory deadline. Failure to address emergency conditions can result in civil penalties and increased liability exposure.

Bulk pricing on balcony repair waterproofing?

Specifying coatings, joist tape, or flashing components across multiple balconies or an entire property? Get volume pricing and material availability. Typical turnaround: one business day.

or call 714-248-6555 · email partners@usmadesupply.com

Detailed Guides

Step-by-step guides for each stage of SB 721 / SB 326 compliance, from finding an inspector through scoping repairs and documenting product substitutions.

SB 721 Property Owner Compliance Guide

Step-by-step compliance for rental apartment owners: finding an inspector, what to expect, budgeting, and documentation.

SB 326 HOA Board Balcony Compliance Guide

Board member playbook: inspector qualifications under SB 326, reserve-study coordination, member communications, and assessments.

Understanding Your SB 721 Inspection Report

How to read the inspector's findings, severity categories, the 180-day repair clock, and what requires emergency action.

SB 721 Balcony Repair Contractor Bid Guide

How owners should scope and compare contractor bids: demolition extent, waterproofing spec, structural connectors, and warranty.

SB 721 Substitution Process for Balcony Repair

Product substitution during repair: ICC-ES evaluation reports, equivalency documentation, and approvals.

Bulk pricing on balcony repair waterproofing?

Specifying coatings, joist tape, or flashing components across multiple balconies or an entire property? Get volume pricing and material availability. Typical turnaround: one business day.

or call 714-248-6555 · email partners@usmadesupply.com

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. For SB 721 buildings, civil penalties of $100 to $500 per day apply when required repairs are not completed within the 180-day non-compliance window under HSC § 17973(i)(2). SB 326 enforcement runs through the local code enforcement agency and civil remedies under the Davis-Stirling Act, rather than a statutory per-diem penalty. 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 (Health & Safety Code § 17973) covers rental apartment buildings with three or more units and allows licensed architects, civil or structural engineers, A / B / C-5 contractors with 5+ years of experience, and certified building inspectors to perform the inspection. SB 326 (Civil Code § 5551, part of Davis-Stirling) covers HOA-governed condominium developments and restricts inspections to licensed architects, structural engineers, or civil engineers. AB 2114 (2024) added civil engineers to the SB 326 inspector list; contractors and certified building inspectors do not qualify under SB 326. SB 326 also has stricter reporting requirements, including filing reports with the local enforcement agency on immediate threats.

I missed the deadline. What should I do now?

Schedule the inspection now and document when you engaged a qualified inspector. Most jurisdictions have not issued blanket enforcement actions against owners who are actively remediating. Penalties under HSC § 17973 trigger after a 180-day repair window, not for the inspection itself. Get the inspection done, review the report, file any permit applications within 120 days for non-emergency findings, and keep written records of every step. If you are a rental-apartment owner, the SB 721 property owner compliance guide walks through the catch-up process. HOA boards: see the SB 326 HOA board compliance guide.

My building is a condo but units are rented out. Which law applies?

The governing statute follows the ownership structure, not the occupancy. If the building is an HOA-governed common-interest development, SB 326 applies regardless of whether individual units are owner-occupied or rented out. SB 721 applies to non-HOA rental apartment buildings. Mixed-use buildings that include an HOA-governed residential component follow SB 326 for that component. When in doubt, look at whether a homeowners association collects assessments and holds reserve funds. That is the SB 326 marker.

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.