What Is Included in a Structural and Title 24 Combo Package for a Permit Set

Nearly 40 percent of Bay Area permit applications are returned for corrections on the first submission — and missing or mismatched structural and energy documents account for the largest share of those rejections. A structural and Title 24 combo package bundles both engineering deliverables into one coordinated set, eliminating the disconnect that triggers most plan-check flags. Our team at Sunny Drafting & Design prepares these packages for residential room additions, ADUs, garage conversions, and light commercial projects throughout the Bay Area.

The combo package is not simply two separate reports stapled together. Every page references the same design assumptions — floor areas, insulation values, framing species, and occupancy type — so the structural calculations and the Title 24 energy report tell a consistent story to the plan checker. That consistency is the single biggest advantage most people gain from ordering both studies from one firm.

This article breaks down every component included in a standard combo package, explains how the documents interact, and identifies the errors our team sees most often on plans submitted without proper coordination.

What a Structural and Title 24 Combo Package Contains

A well-prepared combo package delivers three categories of documents: structural drawings and calculations, a Title 24 energy compliance report, and a set of coordinating sheets that tie the two together. Plan checkers expect all three to agree on every shared value.

Structural Drawings and Calculations

The structural portion addresses load paths, member sizing, and foundation design. Our team typically includes the following sheets:

• Foundation plan — footing sizes, rebar layout, and bearing capacity assumptions
• Framing plan — floor and roof framing with member sizes, spans, and connection details
• Shear wall schedule — the lateral-force-resisting system with hold-down locations
• Beam and column schedule — species, grade, and bearing lengths for every primary member
• Structural calculations — dead load, live load, seismic, and wind analysis per CBC (California Building Code)
• Details and sections — connections at ridge, ledger, shear wall boundary, and foundation

California sits in one of the highest seismic zones in North America. Seismic load analysis is a non-negotiable component of every structural package, regardless of project size. The California Energy Commission also mandates that structural and energy assumptions align in any permitted submittal touching conditioned space.

Title 24 Energy Compliance Report

Title 24 Part 6 governs building energy efficiency in California. The energy report our team produces covers:

• CF1R (Certificate of Compliance) — lists all mandatory energy measures for the project
• CF2R (Installation Certificate) — completed by contractors after work is done; we include a pre-filled template
• CF3R (Field Verification) — HERS (Home Energy Rating System) rater inspection checklist
• Insulation R-values for walls, ceilings, and floors
• Window U-factor and SHGC (Solar Heat Gain Coefficient) compliance
• HVAC system sizing and equipment efficiency ratings
• IAQ (Indoor Air Quality) ventilation calculations
• Mandatory lighting power density limits

Supporting and Coordinating Documents

These sheets prevent the most common plan-check rejections. Our team includes a coordinating notes page that cross-references structural member labels with energy envelope assumptions, a project data sheet covering occupancy group and climate zone, and a code compliance checklist.

Keeping Your Package Current After Initial Submittal

A permit package is a living set of documents. Design changes during plan check or construction require revisions to both the structural and energy portions simultaneously. Our team treats revision management as a core part of the combo package service.

• Scope changes — adding a window, moving a shear wall, or upsizing a beam triggers a structural recalculation and potentially a new energy compliance run
• Plan-check corrections — most corrections on combo packages affect shared values; fixing only one discipline creates new inconsistencies
• Product substitutions — swapping a window brand changes U-factor and SHGC; the CF1R must be updated before final inspection
• Contractor field changes — any deviation from approved structural details requires a revised structural sheet stamped by the engineer of record

Our experience shows that projects with a single point of contact for both disciplines resolve corrections faster. As we explain in our guide on why bundling structural calculations with Title 24 saves Bay Area homeowners time and money, coordinated revisions typically reduce plan-check cycles by one full round.

Misconceptions About Combo Packages

Several myths circulate about the structural and Title 24 combo package. Our team addresses the most persistent ones here.

• Myth: A combo package costs more than ordering separately. In practice, ordering both from one firm eliminates duplicate data entry, reducing total preparation time and overall cost.
• Myth: Small additions do not need structural calculations. Any addition that adds conditioned floor area, removes bearing walls, or modifies the lateral system requires a structural analysis under the CBC.
• Myth: Title 24 only applies to HVAC. Title 24 Part 6 covers the entire building envelope — insulation, windows, lighting, and mechanical systems — not just heating and cooling equipment.
• Myth: An architect can stamp the structural drawings. California requires a licensed structural engineer (SE) or civil engineer (CE) to stamp structural calculations and drawings for residential additions above certain thresholds.
• Myth: Energy compliance is optional for small room additions. California requires Title 24 compliance for all permitted additions to conditioned space, regardless of square footage.

Pro insight: Plan checkers flag inconsistent climate zone designations across structural and energy documents more often than any other single error — always verify that both reports reference the same CEC climate zone before submittal.

Benefits and Trade-offs of the Combo Package Approach

Our team recommends the combo package for most Bay Area projects. The approach has clear strengths and a few limitations worth acknowledging before ordering.

Primary Benefits

• Coordinated assumptions — one firm controls all shared values, preventing the number-mismatch errors that fail plan check
• Faster turnaround — internal coordination replaces back-and-forth between two separate firms
• Single point of accountability — one firm responds to all corrections affecting both disciplines
• Cleaner permit set — formatting and referencing standards are consistent across all sheets
• Cost efficiency — bundled pricing is typically lower than the sum of two separate engagements

Limitations to Consider

• Not every drafting firm can provide both disciplines in-house; verify credentials before ordering
• Complex commercial projects may require a mechanical engineer for HVAC Title 24 modeling, adding a third party
• If a structural engineer is already under contract, engaging a separate Title 24 provider may be more cost-effective than restarting with a new combo firm

For projects in cities with strict submittal requirements, our article on common reasons Bay Area permit sets get rejected at plan check provides additional context on how inconsistent engineering documents contribute to first-submission failures.

Best Practices for a Smooth Combo Package Submittal

Our team follows a consistent protocol when assembling a structural and Title 24 combo package. Most people who receive corrections at plan check have skipped one or more of these steps.

Before Work Begins

1. Confirm the CEC climate zone for the project address — this single value drives the entire energy analysis
2. Obtain current architectural floor plans and the site plan before structural work starts — calculations cannot proceed from preliminary sketches
3. Verify the jurisdiction's document checklist; city requirements vary significantly across the Bay Area

During Preparation

1. Lock in the window and door schedule before running the energy model — late product changes require a full re-run
2. Cross-check every floor area value between the structural calculations and the CF1R form
3. Confirm that insulation R-values on structural details match the CF1R compliance form exactly
4. Review the shear wall schedule against the architectural plan to ensure no walls are missing or mislocated

At Submittal

1. Include a complete permit set checklist matching the city's required document list
2. Attach the signed and stamped structural calculations immediately behind the structural drawings
3. Submit the CF1R with the permit application — do not wait for plan check to request it

For a broader look at what belongs in the full submittal, our guide on what goes into a complete residential permit set in the Bay Area covers every required sheet in detail.

Errors That Cause Permit Rejections

Our team reviews rejected permit sets regularly. The errors below appear on the majority of returned combo packages.

• Mismatched floor areas — structural calculations show 400 sf while the Title 24 report shows 420 sf; the plan checker flags both documents
• Wrong climate zone — the most common energy compliance error; each Bay Area city has a designated CEC climate zone that must match on every form
• Missing PE stamp — structural calculations without a wet or digital stamp from a licensed engineer are automatically rejected
• Unsigned CF1R — the Certificate of Compliance must carry the responsible person's signature before submittal
• Shear walls not shown on floor plan — the architectural plan must clearly mark all shear walls identified in the structural calculations
• Insulation values absent from details — structural section details must call out R-values that match the CF1R
• Outdated code edition — California adopts new building and energy codes on a regular cycle; calculations using a superseded edition are rejected without review

Our article on how to avoid plan check corrections on a Bay Area building permit expands on each of these points and includes city-specific guidance for San Jose, Oakland, and San Francisco.

How the Package Scales by Project Size

The structural and Title 24 combo package adapts to project complexity. The core documents remain constant, but the depth of analysis — and the total page count — increases with project size.

Smaller Projects: Room Additions and ADUs

For a standard room addition or ADU, the package typically runs 12 to 20 pages. The structural scope covers one new foundation section, a simple framing plan, and a prescriptive or performance Title 24 run. Our article on room addition permit set requirements in California describes the full document list for this project type.

ADUs carry their own submittal requirements that vary by jurisdiction. Our guide on ADU permit set requirements for Bay Area homeowners covers which cities require a standalone energy report versus a whole-building compliance approach.

Larger Projects: Second Stories and Major Additions

Second-story additions require a full lateral analysis of the existing structure in addition to new work. The structural package grows to 25 to 40 pages. Title 24 compliance shifts from prescriptive to performance path for most projects above 1,000 sf of new conditioned space, requiring computer-generated energy modeling.

• Structural additions: existing-building shear wall adequacy check, diaphragm analysis, drag strut calculations
• Title 24 additions: whole-building performance model, all-electric vs. mixed-fuel compliance path, battery storage credit evaluation
• Possible extras: geotechnical (soils) report if required by the jurisdiction; MEP (mechanical, electrical, plumbing) coordination sheets for commercial work

Our team's consistent recommendation for larger projects: start structural and energy work in parallel, not sequentially. This single scheduling decision saves the most calendar time of any step in the process.

Frequently Asked Questions

Key Takeaways

• A structural and Title 24 combo package delivers structural drawings, stamped calculations, and an energy compliance report in one coordinated set — reducing plan-check rejections caused by inconsistent values across disciplines.
• The most common cause of first-submission rejection is mismatched floor areas or climate zone designations between the structural and energy documents — a problem that coordinated preparation eliminates entirely.
• Package scope scales with project complexity: smaller additions run 12 to 20 pages, while second-story projects with full lateral analysis routinely exceed 40 pages and shift to performance-path Title 24 compliance.
• Ordering both disciplines from one firm shortens revision cycles, reduces total cost, and provides a single point of accountability throughout the permit process.