Third party plan review is a program offered by many local building departments that lets you hire a pre-approved private firm to check your construction documents for building code compliance instead of waiting in the municipal review queue. The appeal is speed: a private reviewer handling your project is not juggling hundreds of other applications, and turnaround times of one to two weeks are common for work that might take six to eight weeks through municipal staff. You pay the reviewer’s professional fee for that speed, usually on top of the standard permit cost. Eligibility, reviewer qualifications, and fee structures are set by local ordinance, so the specifics vary from one jurisdiction to the next.
Which Projects Qualify
Most jurisdictions open the program to a broad range of residential and commercial construction. New single-family homes, guest houses, major additions, and structural renovations typically qualify on the residential side. Retail buildouts, office buildings, and industrial facilities are common commercial candidates. Specialized systems fall within scope too, so electrical, mechanical, plumbing, and fire protection plan reviews can go through a private firm rather than waiting for each municipal trade reviewer separately.
The general rule: any project that needs a standard building permit can go through third party review unless the jurisdiction explicitly excludes it. Common exclusions include work in historic districts, projects that need complex zoning variances, and structures subject to special governmental review such as flood plain development or critical infrastructure. Some municipalities limit the program to commercial work only; others cover residential from the start. Your building department’s website or permit counter lists the eligible project types.
What It Costs
Using a private reviewer creates two separate cost streams: the reviewer’s professional fee and the municipal permit fee.
Reviewers generally price their services one of three ways. A flat fee based on project valuation or square footage is common for straightforward work with a well-defined scope. Hourly billing fits complex or unusual projects where review time is harder to predict. Some firms use a hybrid, charging a flat fee for the initial review and hourly for additional correction cycles. Get a written fee proposal before committing, and confirm whether the quoted price includes a set number of re-review rounds or charges separately for each cycle.
On the municipal side, some jurisdictions reduce the standard permit fee when you go the third party route since the building department is not performing the technical review. The reduction varies. Some places charge only a reduced administrative processing fee; others charge the full permit fee regardless. Ask the building department about any adjustment before you assume the private path will save money on the government side. Factoring in the reviewer’s fee, the total cost of third party review is almost always higher than municipal review. You are paying for speed, not savings.
How the Process Works
Once you select an approved reviewer and assemble the full document package, the process moves through a predictable sequence.
Review and Correction Cycles
The reviewer examines every sheet of the construction documents against applicable building, fire, mechanical, electrical, plumbing, and energy codes. First submissions almost always contain non-compliant elements, so expect a written list of deficiencies to come back to the applicant and design team. The design professionals correct the plans and resubmit. This back-and-forth continues until the reviewer is satisfied that every code requirement has been met. Experienced reviewers provide a specific code reference for each deficiency, which makes corrections faster and reduces the number of cycles.
Certification
When the plans pass, the reviewer prepares a signed and sealed certification report affirming that the documents comply with all applicable codes. The certified package, meaning the approved plans plus the reviewer’s report, goes to the local building department. The building official does not re-review the technical content from scratch. Instead, the official performs an administrative verification: confirming that the reviewer is currently approved, that the certification is complete, and that no jurisdictional issues such as unresolved zoning conditions remain outstanding.
Permit Issuance
The building official retains final authority. In the typical case, the official accepts the third party certification and issues the permit after administrative review. Some jurisdictions set a specific deadline for this step; model legislation from organizations studying building regulatory reform calls for a 10-business-day turnaround from receipt of the certified package. If the official identifies a problem with the certification or finds a jurisdictional conflict the reviewer could not have known about, the official can reject the recommendation and send the project back for further review. That outcome is uncommon when both sides are doing their jobs, but it reinforces the point that the municipality never fully delegates its authority over building safety.
What to Submit
The document package for third party review is the same as what you would submit for a municipal review. The reviewer needs everything required to evaluate code compliance across all building systems. A typical submission includes:
- Architectural drawings, including floor plans, elevations, building sections, and details showing materials, dimensions, and means of egress
- Structural calculations prepared by a licensed engineer demonstrating that the building can handle dead loads, live loads, wind, seismic forces, and snow where applicable
- A site plan showing the structure’s location relative to property lines, setbacks, easements, utilities, and existing topography
- Mechanical, electrical, and plumbing plans with equipment specifications and sizing calculations
- Fire protection plans, including sprinkler layouts, alarm system configurations, and fire-rated assembly details where required
- Soil and geotechnical reports with boring logs and foundation recommendations from a geotechnical engineer
Most jurisdictions now also require proof that the building envelope and mechanical systems meet energy efficiency standards adopted from the International Energy Conservation Code. For residential projects (detached one- and two-family homes and multifamily buildings three stories or fewer), the Department of Energy’s REScheck software generates a compliance report showing whether the proposed insulation levels and window specifications meet code through a thermal performance tradeoff calculation.1Building Energy Codes Program. REScheck Commercial projects use the companion COMcheck tool for the same purpose. Include these reports in the submission package because the reviewer will need them to certify full code compliance.
Alongside the technical documents, complete the jurisdiction’s third party program application. These forms typically request the property owner’s legal name and contact information, the project address, total square footage, occupancy type, and estimated construction valuation. You also identify which approved firm is handling the review. Every data point on the forms should match what appears on the construction drawings. Inconsistencies between the application and the plans are one of the most common reasons submissions get bounced back before review even starts.
How to Vet a Reviewer
Private reviewers must meet professional standards that mirror or exceed what the jurisdiction requires of its own staff. The baseline credential is typically a current license as a professional engineer or registered architect in the state where the project is located. In many programs, an ICC Master Code Professional certification can substitute for or supplement state licensure. Firms and individuals must register formally with the local building department before they can accept review assignments, so your first check is confirming the firm is on the jurisdiction’s approved list.
Beyond state licensure, many jurisdictions require reviewers to hold discipline-specific plans examiner certifications from the International Code Council covering the trades they’re reviewing: building, electrical, mechanical, plumbing, fire, and energy.2ICC. Credentialing – Combination Designations A reviewer checking fire sprinkler layouts needs the fire credential; one checking structural plans needs the building credential. Larger firms employ specialists across multiple disciplines so they can handle a complete set of construction documents in-house rather than farming out individual trades.
Reviewers must also carry professional liability insurance, commonly called errors and omissions coverage. Minimum policy limits vary by jurisdiction but typically fall between $1,000,000 and $5,000,000. The coverage protects property owners and municipalities if the reviewer misses a code violation that later causes damage or requires costly corrections. Some programs also require general commercial liability as a separate policy. Ask the firm for a current certificate of insurance.
Conflict of Interest Rules
The integrity of a private review depends entirely on the reviewer having no financial or professional stake in the project’s outcome. Jurisdictions that authorize these programs typically prohibit a reviewer from accepting an assignment when any of these relationships exist:
- The reviewer is owned by, employed by, or otherwise controlled by the project owner, general contractor, or any subcontractor on the project
- The reviewer, or anyone at the reviewer’s firm, prepared architectural, structural, mechanical, plumbing, or electrical design documents for the same project
- The reviewer previously served as a code consultant or advisor to the owner or design team on the same project
- The reviewer is also providing inspection services for the same project, which creates a situation where the same entity both approves the plans and verifies the construction
When a potential conflict is ambiguous, the reviewer is expected to disclose the relationship to the building official and seek a determination before starting work. Failing to disclose a conflict can result in revocation of the reviewer’s approval status, rejection of the completed review, and potential professional discipline. Before you hire a firm, confirm in writing that no one on their team has worked on the design or will be inspecting the construction.
Who Is Liable If Something Is Missed
If a reviewer certifies plans that later turn out to have a code violation, who is on the hook? The answer depends on the jurisdiction, but the general framework puts primary professional liability on the reviewer. That is exactly why errors and omissions insurance is a prerequisite for approval. The certification is a professional statement that the plans comply with code, and a negligent certification exposes the reviewer to claims from the property owner, the municipality, or injured parties.
The building official who accepted the certification and issued the permit is generally shielded from liability for technical errors in the review itself, since the official’s role is administrative verification rather than independent technical analysis. If the official had reason to know the certification was deficient and issued the permit anyway, that protection weakens. The design professionals who prepared the original plans also retain their own liability. A reviewer’s approval does not relieve the architect or engineer of responsibility for their design. Third party review adds a layer of professional accountability rather than replacing the existing ones.