SB 721 Balcony Repair Contractor Bid Guide

This guide is for contractors preparing a bid on SB 721 or SB 326 balcony repair work, and for owners and HOA boards evaluating bids that come back. It covers how to scope the repair, which CSLB license classifications actually cover the work, how to structure a bid that survives hidden substrate damage, what submittals belong with the proposal, how warranty stacks, and what inspector coordination the general contractor is responsible for.

It does not cover the inspection itself. The inspection is a separate scope, performed by a qualified professional under different statutory requirements. For background on the inspection side and what triggers a repair, see the California Balcony Law hub. To interpret an inspection report before scoping a bid, see Understanding Your SB 721 Inspection Report.

Under Business & Professions Code § 7028, performing contracting work outside of the classifications a license authorizes is a misdemeanor and voids mechanics lien rights. SB 721 repair work typically spans framing, waterproofing, flashing, guardrails, and finishes. Almost always more than one trade. The prime contractor must either hold a classification that covers the full scope or sub-contract the parts it does not cover to appropriately licensed specialty contractors.

Inspector-qualification classifications (A, B, or C-5 with 5+ years of multistory wood-frame experience) under § 17973(a) are a separate question from who can perform the repair. See the Inspector Coordination section for how the inspector and repair contractor roles interact.

A complete SB 721 or SB 326 repair bid usually covers each of the following. Omitting any of them is the fastest way to create a change-order cascade after demolition exposes the substrate.

A pure lump-sum bid on SB 721 repair work rarely works. The contractor cannot see what's under the membrane until demolition starts, and the inspection report. While useful. Is a visual observation of the exposed condition, not an exhaustive destructive survey. The bid format that holds up is a three-part hybrid: lump-sum for the knowable scope, unit-price for the quantity-variable items, and allowance for the genuinely unknowable.

Pricing ranges commonly cited in industry sources (illustrative, not CSLB data): waterproofing and resurfacing per balcony ~$1,500–$5,000; structural framing repair per balcony ~$3,000–$15,000+; railing replacement per unit ~$1,000–$4,000; full rebuild per unit ~$10,000–$30,000+. These are broad ranges. Regional labor rates, system specification, and site access all move the number significantly.

Submittal quality is a bid-evaluation signal. A bidder who submits the following with the proposal is demonstrating they have done the specification work; a bidder who says "we'll submit after award" is shifting that risk to the owner.

• Product data sheets for the waterproofing system, flashing, sealants, and primary fasteners
• ICC-ES Evaluation Report reference for the waterproofing system (for example, ESR-3672 for Deck Flex W.M. and W.F. under AC39). The ESR number binds the assembly that will be installed. See ICC-ES AC39 for what AC39 evaluates
• Warranty registration forms for the manufacturer material warranty and, where applicable, the joint system warranty
• Approved-applicator certification from the waterproofing manufacturer, with effective date and expiration
• Shop drawings for structural repairs. Ledger connection detail, joist-hanger schedule, guardrail post anchorage
• Material samples of the waterproofing topcoat color and texture
• Proof of CSLB license, workers-comp coverage, and project-appropriate general liability limits
• Bidder-named specialty sub-contractors with their CSLB license numbers verifiable at CSLB License Lookup

CBC § 105.1 requires a permit for any repair, alteration, or replacement of a building or structure. Cosmetic work exempt under § 105.2 (painting, wallpaper, small sheds) does not apply here; any SB 721 or SB 326 repair that touches framing, ledger, guardrail anchorage, flashing, or membrane requires a permit from the local jurisdiction. HSC § 17973(g) reinforces this: "All necessary permits for repair or replacement shall be obtained from the local jurisdiction… and shall be subject to the California Building Standards Code."

The 120-day clock under § 17973(h)(2) is specifically 120 days to apply for the permit, not to complete the repair. Completion timing is set by the permit, the severity of the finding, and any inspector-directed emergency stabilization; do not bid the project on the assumption that all repairs must be finished within 120 days of the inspection report.

Stamped engineered drawings are required whenever a structural member is modified or replaced beyond a like-for-like in-kind replacement. Per CBC § 107.1 and § 1603, structural drawings for Group R occupancy repairs must be prepared by a California-licensed architect or civil or structural engineer. In practice, most jurisdictions require stamped plans the moment the repair deviates from in-kind replacement. For example, re-engineering a ledger connection because the original detail is unknown, upsizing joists, or adding a guardrail anchor that did not exist in the original construction. Confirm locally before pricing; some plan-check desks require stamps for all SB 721 repairs as a matter of policy.

The general contractor typically pulls the permit. When the owner pulls it under an owner-builder permit, the CSLB restriction under B&P Code § 7044 still applies. The owner cannot use an owner-builder permit to avoid hiring licensed contractors for the actual work.

The inspection is not done when the report is delivered. The original inspector (or their firm) typically returns for pre-cover re-inspection of critical assembly points. Flashing integration, structural connectors, ledger reattachment. Before the waterproofing closes up the work. Build those re-inspection visits into the project schedule and the base bid. Leaving them as an owner-direct line item creates scheduling friction and invites a bidder to strip the cost out of their base to come in low.

SB 326 has no analogous provision in Civil Code § 5551 because SB 326 inspectors are limited to architects and licensed engineers. Not contractors. So the conflict cannot arise the same way. Any firm that performed the SB 326 inspection still should not bid the repair; the professional-conflict norms for architects and engineers reach a similar result even without the statutory language.

Good inspector coordination on the general contractor side includes: at least 5 business days' notice before each re-inspection milestone; a hold-point schedule in the submittal package showing when the inspector is needed (substrate cleared, flashing installed, membrane applied, final); and a written completion letter from the manufacturer field rep that the inspector can attach to the final report.

A defensible SB 721 repair warranty is a three-layer stack. Each layer has a distinct obligor and a distinct scope. Collapsing them into a single "contractor guarantees the work for X years" statement almost always means the material side is unregistered. And therefore voided . From day one.

Most walking-deck ESRs condition manufacturer warranty. And in some cases the evaluation report itself. On installation by a manufacturer-trained, approved applicator. Verify the specific language on the ESR for the system being specified; it varies by report.

As a worked example, the Deck Flex W.M. (Class A) and W.F. (Class B) specification guides under ESR-3672 both require a two-part applicator test for bonded walking-deck installations:

• Licensed contractor approved by the manufacturer (written certification on file, current)
• Licensed specialty contractor in the business of applying elastomeric membrane roofing and waterproofing for a minimum of 5 years

This two-part test is representative of the approved-applicator standard for non-floating bonded systems. It is not a universal rule across all walking-deck ESRs, but it is a useful benchmark when evaluating a bidder: the 5-year elastomeric-membrane operating history is a gating criterion that separates specialty applicators from painting contractors who occasionally touch deck work.

Manufacturer quality-assurance procedures for approved-applicator projects typically include: written certification that the applicator is approved for this type and size of project; a pre-start site visit to inspect substrates (commonly with 5 days' notice); periodic review during waterproofing work with written exceptions; and a completion letter to the architect or owner indicating compliance. These QA steps are part of why the joint system warranty exists. The manufacturer has direct observation of the install.

The patterns below come up on almost every multi-balcony repair project. Each one is avoidable if the bid is structured deliberately.

This section is for the owner, property manager, or HOA board reviewing contractor bids. You do not need to evaluate framing calculations or coating chemistry. The questions below are surface-readable and catch most of the problems before they become construction-phase fights.

• Verify the bidder's CSLB license status at CSLB License Lookup. Check for an active license, classifications that cover the full repair scope (or named sub-contractors who do), and no pending disciplinary actions.
• Confirm the bid names a specific waterproofing system by ICC-ES ESR number, not just by product brand. "ESR-3672" is a verifiable reference; "Brand X deck coating" is not.
• Confirm the bidder is listed on the manufacturer's approved-applicator roster with a current effective date, not just "we use that product."
• Look for unit-price line items for joists (per LF), membrane (per SF), and guardrail posts. A pure lump-sum bid on SB 721 repair is a red flag.
• Confirm warranty terms by layer. Material, workmanship, and (when applicable) joint system. With the manufacturer registration process written in.
• Confirm that inspector re-inspection coordination is in the bidder's scope, with a named number of visits. Ask what happens if additional visits are needed.
• Confirm none of the bidders performed the SB 721 inspection on your property. HSC § 17973(g) bars inspecting contractors from performing the repair.
• Ask how the bidder handles weather delays, tenant access, and dust containment. The answers to these three questions tell you more about their operational maturity than the line-item total does.