The building plan review process is the local government’s technical audit of your construction drawings before a permit is issued, and it runs your plans through specialists in structural engineering, fire protection, zoning, accessibility, and energy efficiency against the codes your jurisdiction has adopted. Nearly every new building, major addition, or significant structural change goes through it. Simple residential projects can clear in two to four weeks; complex commercial work routinely takes 60 to 120 days for the first pass, and most projects come back with corrections before approval.
When Your Project Needs a Plan Review
If the work changes a building’s structure, footprint, or occupancy classification, expect to submit plans. That covers new construction, room additions, removing a load-bearing wall, commercial tenant buildouts that alter the floor plan, and use conversions like turning a warehouse into a restaurant.
Smaller work is often exempt. Typical exemptions include storage sheds under a certain size (often around 200 square feet), short fences, small retaining walls, like-for-like window or door replacements, and minor plumbing or electrical swaps that don’t change the system layout. Thresholds vary by jurisdiction, and the building official can also exempt genuinely minor work that doesn’t affect safety. Check with your local building department before you assume your project qualifies.
What Goes in the Submission Package
A plan review submission is a package, not a single document. One missing component can send the whole thing back at intake, so assembling it carefully is the best time investment you’ll make.
The core is the architectural set: floor plans, elevations, and cross-sections showing layout, room dimensions, ceiling heights, and how the building sits on the lot. Structural engineering plans go with these, including calculations for foundation loads, beam sizing, roof support, and resistance to wind or seismic forces. Reviewers use those calculations to confirm the building can handle what it will face over its lifetime.
Site plans show the property from above: lot boundaries, setbacks from property lines, existing structures, grading, drainage, and utility connections. The department needs to confirm your project won’t push water onto neighbors or conflict with utility easements. Larger projects may need a separate grading plan from a civil engineer.
Mechanical, electrical, and plumbing (MEP) drawings cover the internal systems: HVAC ductwork and equipment, electrical panel locations and circuits, water supply and drainage piping. Each discipline must show compliance with the applicable national standards.
Then there’s the administrative paperwork: the permit application, parcel number, contractor licensing information, and proof of workers’ compensation insurance. Licensed architects or engineers sign and seal the plans to certify professional responsibility for the design. Many jurisdictions now accept digital submissions with encrypted electronic seals, though the technical requirements for valid digital signatures vary by state.
Environmental and Flood Zone Documents
Projects that will disturb one or more acres of land trigger federal stormwater requirements under the Clean Water Act. You’ll need a Stormwater Pollution Prevention Plan (SWPPP) and coverage under the NPDES Construction General Permit before construction begins. Sites under one acre still need coverage if they’re part of a larger development that will eventually disturb an acre or more.1Environmental Protection Agency. Getting Coverage Under EPA’s Construction General Permit / Waivers
If the property is in a FEMA-designated Special Flood Hazard Area, the package must include an Elevation Certificate prepared by a licensed surveyor, engineer, or architect. The form documents the building’s lowest floor elevation relative to the Base Flood Elevation and shows compliance with National Flood Insurance Program rules. Non-residential buildings in these zones can be floodproofed up to or above the Base Flood Elevation; residential floodproofing is generally not allowed unless FEMA has granted the community a specific exception.2Federal Emergency Management Agency. Elevation Certificate and Instructions
What Reviewers Actually Check
Reviewers work through the plans discipline by discipline, checking each system against the code your jurisdiction has adopted. Most jurisdictions use some edition of the International Building Code (IBC) for commercial structures and the International Residential Code (IRC) for one- and two-family homes. The 2024 edition is current, but many jurisdictions still enforce an earlier version depending on when they last updated their local adoption.3ICC Digital Codes. 2024 International Building Code
Zoning and Land Use
Before anyone looks at structural math, the plans get a zoning check. The reviewer confirms the proposed use matches what’s allowed on the property, verifies setback distances, lot coverage limits, building height restrictions, and parking counts. A commercial project can’t go on land zoned exclusively for residential use, and emergency vehicles need to be able to reach the building.
Structural Integrity
Structural reviewers verify load-bearing capacity from the foundation up through the roof. Specified concrete strength, rebar grade, lumber dimensions, and steel connection details all have to meet minimum safety thresholds for regional conditions: wind in coastal areas, snow loads up north, lateral forces in seismic zones. If a calculation doesn’t work, the reviewer flags that section for redesign. This is where most plan review corrections originate, and for good reason. A structural failure can’t be patched after the building is up.
Fire Protection and Life Safety
Fire review covers egress paths, fire-rated wall and floor assemblies, and automatic suppression systems. The IBC requires automatic sprinklers in most commercial occupancies, with rules varying by building height, area, and use. One- and two-family dwellings follow NFPA 13D.4ICC Digital Codes. IBC Chapter 9 – Fire Protection and Life Safety Systems Reviewers confirm exits are properly sized, clearly marked, and lead to a safe discharge point. In townhomes and mixed-use buildings, fire-rated separations between units get close attention.
Projects in wildfire-prone areas may also need to comply with the International Wildland-Urban Interface Code, which requires ignition-resistant construction: roofing, siding, vents, and decks built to resist embers, radiant heat, and direct flame.5International Code Council. Wildland-Urban Interface Code
Energy Efficiency
Energy compliance is evaluated against the International Energy Conservation Code (IECC), which the U.S. Department of Energy has determined improves energy efficiency in buildings subject to the code.6Federal Register. Analysis Regarding Energy Efficiency Improvements in the 2021 International Energy Conservation Code Reviewers check insulation R-values, window glazing specifications, HVAC equipment efficiency ratings, and air sealing details. The edition your jurisdiction enforces depends on local adoption.
Accessibility
Commercial buildings and public accommodations have to comply with federal accessibility law at the plan review stage, not during construction as an afterthought. Under the Americans with Disabilities Act, any facility designed for first occupancy must be readily accessible to and usable by individuals with disabilities. Buildings under three stories or under 3,000 square feet per floor don’t need elevators, unless the building is a shopping center, shopping mall, or healthcare provider’s office.7Office of the Law Revision Counsel. 42 USC 12183 – New Construction and Alterations in Public Accommodations and Commercial Facilities
The enforceable standard is the 2010 ADA Standards for Accessible Design, mandatory for all new construction and alterations since March 15, 2012.8eCFR. 28 CFR 36.406 – Standards for New Construction and Alterations Reviewers check accessible routes, door widths, ramp slopes, elevator specifications, accessible parking and restroom counts, and signage. When an alteration affects a primary-function area, the path of travel to that area must also be made accessible, capped at 20 percent of the alteration’s total cost.9ADA.gov. 2010 ADA Standards for Accessible Design
Multifamily housing with four or more units carries separate obligations under the Fair Housing Act. In buildings with elevators, every unit must meet seven accessibility design standards; in buildings without elevators, those standards apply to all ground-floor units. The requirements cover wide doorways, accessible routes through each unit, reachable environmental controls, reinforced bathroom walls for future grab bars, and usable kitchens and bathrooms.10Office of the Law Revision Counsel. 42 USC 3604 – Discrimination in the Sale or Rental of Housing
How Submission and Intake Work
Once your package is assembled, you submit through the building department’s permit portal or deliver physical copies to the counter. Many departments use online platforms where you upload drawings, track status, and receive comments electronically. A plan review fee is collected at intake. Some jurisdictions charge a flat rate by project type, others calculate fees as a percentage of estimated construction cost, and some use square footage formulas. Expect anywhere from a few hundred dollars for a simple residential project to several thousand for large commercial work.
At intake, a clerk confirms all required documents are present and that professional seals and signatures appear where required. If anything is missing, the package comes back with a checklist. Once accepted, your project gets a tracking number and the plans are distributed to reviewers in each discipline: structural, fire, plumbing, mechanical, electrical, zoning, and accessibility.
Some jurisdictions let you hire an approved third-party plan review firm instead of waiting for the municipal queue. The third-party reviewer applies the same codes and standards, but turnaround is often faster because they’re working on your project directly. The building department still issues the final approval, but the technical review work is done. Not every jurisdiction offers this option.
How Long It Takes
Timelines vary enormously by jurisdiction, project complexity, and departmental backlog. Simple residential projects in responsive jurisdictions can clear review in two to four weeks. Complex commercial projects routinely take 60 to 120 days for the initial cycle, and some large metros stretch well beyond that. Those figures are just the first pass. If your plans come back with corrections, and they usually do, each resubmittal triggers another review cycle, though later rounds are typically shorter.
The biggest factor you can control is submission quality. Incomplete packages, missing calculations, and hard-to-read plans slow everything down. Working with architects and engineers who know your local department’s expectations can shave weeks off the process. Submitting plans that are 90 percent right but missing a few details is worse than waiting another week to submit a complete package, because a rejection resets your place in the queue.
Corrections and Final Approval
After each discipline reviewer finishes, the department compiles the feedback into a correction sheet, sometimes called plan check comments. The document lists every point where the design fails to meet code or needs clarification. Some comments are substantive, like a beam flagged as undersized for its specified load. Others are documentation issues like missing notes or unclear dimensions.
You address each comment by revising the drawings or providing supplemental calculations, then resubmit. The back-and-forth continues until every item is resolved. For a straightforward residential project, one round of corrections is typical. Commercial projects with multiple reviewing disciplines often go through two or three. The same mistakes recur constantly in experienced reviewers’ queues: undersized headers, missing fire-rated assemblies at occupancy separations, inadequate accessible parking counts. Addressing them in the original submission pays off.
When the last reviewer signs off, the department stamps the plans as approved. That stamp is the legal authorization to proceed with construction under the oversight of local building inspectors. The building permit is then issued, and in most jurisdictions it remains valid for roughly six months, provided construction activity begins within that window. If you don’t start work before the permit expires, you’ll generally need to reapply and pay additional fees, and your project may have to comply with any code updates adopted in the interim.
What Approval Covers and What Comes Next
Approved plans aren’t the end of oversight. Construction triggers a series of mandatory inspections at specific milestones: foundation before concrete is poured, slab or under-floor before the pour or subfloor goes down, rough framing with MEP before insulation, insulation before drywall, and a final inspection when the building is substantially complete. You can’t proceed past each stage until the inspector signs off. Covering up work before inspection, like pouring concrete over uninspected rebar, is one of the fastest ways to get a stop work order and have to remove the finished work at your own expense.
After the final inspection passes, the building department issues a certificate of occupancy for commercial buildings or final approval for residential projects. The certificate of occupancy confirms the building is safe for its intended use and is typically required before any business can operate from the premises.
Appealing a Reviewer’s Decision
If you believe a reviewer has misinterpreted the code, applied a provision that doesn’t fit your project, or rejected an alternative method that meets or exceeds the code’s intent, you can appeal. The IBC establishes a board of appeals in each jurisdiction for this purpose. Under the model code, an appeal must be based on one of three grounds: the code was incorrectly interpreted, the code provisions don’t fully apply to the situation, or an equally good or better form of construction is proposed.11ICC Digital Codes. IBC Appendix B – Board of Appeals
The model code appeal window is 20 days from the date of the decision. You file with the building official, pay an appeal fee, and present evidence to the board at a hearing. The board hears testimony from both sides and issues a ruling. One important limit: the board can’t waive code requirements. It can only decide whether the code was correctly applied or whether your alternative provides equivalent safety.
Zoning disputes follow a different track. If your project conflicts with a zoning ordinance and strict application creates an unreasonable hardship from unique property characteristics, like an oddly shaped lot or unusual topography, you can apply for a variance through the zoning board of adjustment. The hardship has to stem from the property’s inherent conditions rather than something you created, and the requested variance must still be consistent with the ordinance’s intent and public safety.
What Happens If You Build Without Approved Plans
Skipping plan review isn’t a shortcut. The first consequence is usually a stop work order. Once a building inspector or code enforcement officer discovers unpermitted construction, all work halts until the situation is resolved. Continuing to build after a stop work order carries daily fines that typically range from $250 to $500, with some jurisdictions imposing penalties up to several thousand dollars per day.
Resolving a stop work order means going through plan review retroactively, which costs more and takes longer than doing it right the first time. You’ll need a professional to document existing conditions, prepare as-built drawings, and submit them for review against current codes rather than the codes in effect when the work was done. Many jurisdictions charge penalty multipliers on retroactive permit fees, often two to four times the standard cost. If the completed work doesn’t meet code, bringing it into compliance can mean opening walls, replacing materials, or demolishing and rebuilding portions of the structure.
The consequences extend past fines. Unpermitted work can block the sale of a property when it surfaces in a title search or buyer’s inspection. Homeowners insurance policies routinely exclude coverage for damage caused by or to unpermitted construction. And if the work causes injury to an occupant or a neighbor, the liability exposure grows sharply because the work was never reviewed for safety.