AI plan check in Denver, CO
Denver Community Planning and Development reviews against the 2021 Denver Building Code, the 2021 IBC with local amendments that include the Green Building Ordinance and electrification requirements for new construction. Two physical facts also shape every set here: the ground under much of the metro is expansive bentonite clay that lifts slabs, and the city sits high enough that combustion equipment and air handling have to be derated for altitude. AI plan check screens the drawings against all of that before submittal.
For Denver, CO construction teams. Last reviewed August 2026.
Why Denver's Building Code Matters for Your Drawing Set
Denver enforces the 2021 Denver Building Code, built on the 2021 IBC and amended locally in ways that hit the drawings hard. The Green Building Ordinance applies to larger projects and puts roof-area obligations, energy performance, and related documentation directly onto the architectural, structural, and mechanical sheets, since a green roof or solar area changes dead load, drainage, and access as much as it changes the compliance narrative. Electrification requirements for new construction reach the mechanical and electrical sets together, changing equipment selection, service size, panel schedules, and the space allocated for equipment. Beyond the written amendments, two site conditions behave like code requirements in practice. Expansive bentonite clay is widespread across the Front Range, and it makes foundation type a geotechnical decision rather than a default: drilled piers with void form, structural floors over crawl space, and detailed slab separation are typical, and reviewers expect the details to match the soils report. Altitude is the other. Reduced air density derates combustion equipment and changes airflow, so equipment schedules need altitude-corrected capacities rather than catalog sea-level numbers. Snow loads per ASCE 7 close it out, with drift and sliding at roof steps carrying most of the risk.
How the Denver Community Planning & Development Reviews Construction Drawings
A Denver set moves through separate building, structural, fire, zoning, and site development reviews at Community Planning and Development, and a typical commercial review runs roughly 4 to 10 weeks. On larger projects the Green Building Ordinance and electrification items add review touchpoints that teams from outside Colorado often do not budget for. Zoning review deserves particular attention, because Denver's form-based zoning puts building form, height, and street-level requirements into the same submittal window as the technical review, and a form correction can force a change the building reviewers already cleared. Site development review for drainage and public way work runs alongside. The practical scheduling lesson is that a single correction letter in Denver rarely touches only one discipline, so the cost of a bounce is the coordination effort to reconcile everything the change touches, not just the reviewer's turnaround time.
Common Plan-Check Issues in Denver
The recurring failures on Denver sets are foundational, mechanical, and documentary. Expansive soil is the first: structural drawings that show a conventional slab-on-grade where the geotechnical report calls for drilled piers and a structural floor draw comments immediately, as do pier schedules missing void form, and slabs detailed without the separation and float clearance that keep interior partitions off a heaving floor. Altitude is the second and it is easy to miss on a set produced out of state, because furnaces, boilers, and water heaters lose rated input at this elevation and air handling volumes shift, so schedules built from sea-level catalog data understate what the building needs. Green Building Ordinance compliance gets returned when the chosen path is described in a narrative but the roof plan, structural framing, and drainage never picked it up. Electrification items surface late when a gas-fired prototype gets swapped to electric equipment without resizing service, panels, or equipment space. Snow loading generates structural comments at roof steps, parapets, and mechanical screens where drift and sliding loads were never calculated. Historic and Lower Downtown design overlays add a facade review layer on renovation work in specific districts.
Denver Project Types and What They Require
Denver's pipeline is dominated by dense urban work with an unusual specialty tail. Mixed-use urban infill in RiNo, Cherry Creek, and along Broadway brings podium construction, occupancy separation, and ground-floor form requirements from the zoning code. Multifamily carries accessibility distribution, fire separation, and the Green Building Ordinance once the project passes the applicable size. Transit-oriented development around RTD stations adjusts parking and density and pulls station-area zoning language onto the drawings. Cannabis facilities are a Denver specialty with a distinctive compliance footprint: odor control and exhaust, hazardous materials for extraction processes, electrical loads for cultivation lighting, and security requirements that all land on the MEP sheets. Life science and lab space adds containment, exhaust, and vibration criteria that push structural and mechanical well past office norms. Each of those changes what a reviewer looks for first.
Denver Plan-Check FAQs
What building code does Denver use?
Denver enforces the 2021 Denver Building Code, which is the 2021 IBC with Denver amendments including the Green Building Ordinance and electrification requirements for new construction. Design to the amended Denver edition, since those local provisions are where the majority of corrections start.
How long does Denver plan review take?
A typical commercial review runs roughly 4 to 10 weeks across separate building, structural, fire, zoning, and site development reviews. Larger projects add Green Building Ordinance and electrification review touchpoints. Because Denver corrections often affect multiple disciplines at once, the coordination cost of a bounce usually exceeds the reviewer turnaround time.
How does expansive bentonite clay affect my foundation drawings?
Expansive clay is common across the Front Range and it can heave slabs and lift interior partitions. Reviewers expect a foundation type that matches the geotechnical report, which often means drilled piers with void form and a structural floor rather than a conventional slab-on-grade. Pier schedules and slab separation details that contradict the soils report are a frequent structural correction.
Does Denver's altitude change mechanical equipment sizing?
Yes. Reduced air density at Denver's elevation derates combustion equipment and changes airflow, so furnaces, boilers, water heaters, and air handling need altitude-corrected capacities rather than sea-level catalog values. Equipment schedules produced out of state commonly understate capacity, which shows up as a mechanical correction.
What does the Green Building Ordinance require on the drawings?
For projects above the applicable size threshold it sets roof-area and energy performance obligations that have to show up as real design decisions. A green roof or solar area changes dead load, drainage, and roof access, so the architectural, structural, and mechanical sheets all have to reflect the compliance path chosen, not just the narrative.
How does AI plan check help on a Denver project?
Helonic reads the full set against the 2021 Denver Building Code in minutes and flags likely issues across Green Building Ordinance compliance, electrification, expansive soil foundation detailing, altitude-corrected equipment, and snow drift loading, citing the sheet and section for each. Helonic is a screening tool. The licensed Engineer of Record retains design responsibility, and Community Planning and Development retains approval authority.
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