Local Building Departments - Modulars
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In Colorado, there are over 300 jurisdictions. Most have active building departments and each have their own Ordinances and building code adoptions. With the vast differences in codes, it can be difficult to produce a manufactured unit that can be installed anywhere in Colorado. The Division of Housing (DOH) does take this into consideration and has adopted rules that require that at a minimum, these units comply with local geographic and climatic conditions. Below you will find a few elements of construction that the DOH takes into consideration.
Construction Requirements
A Modular (FB/FBNR) built unit has to comply with the following requirements at a minimum in Rule 2 of the Administrative Rules 8 CCR 1302-14:
- Roof Snow Load: 30 psf, non-reducible
The roof snow load, wind design, and seismic zone shall be in accordance with the local jurisdiction requirements and shall not be less than the minimums stated. The allowable increase for snow duration shall not be used when the snow load is above 65 PSF. - Basic Wind Speed: 115 (Vult), Exposure C
The roof snow load, wind design, and seismic zone shall be in accordance with the local jurisdiction requirements and shall not be less than the minimums stated. The allowable increase for snow duration shall not be used when the snow load is above 65 PSF. - Wind Topographic Effect: Per Local
- Seismic Design Category: Minimum B
The roof snow load, wind design, and seismic zone shall be in accordance with the local jurisdiction requirements and shall not be less than the minimums stated. The allowable increase for snow duration shall not be used when the snow load is above 65 PSF. - Weathering: Severe
- Frost Line Depth: Per Local
In areas of the state without a local jurisdiction, the Division of Housing will approve all temporary or permanent foundation systems as defined in Rule 2. - Termite Damage: Slight
- Winter Design Temperature: Per Local
See Appendix B of the Administrative Rules and verify with local jurisdiction. - Ice Barrier: Yes
- Flood Hazards: Per Local
- Air Freezing Index: Per Local
See the National Climatic Data Center data table “Air Freezing Index-USA Method (Base 32o Fahrenheit).” - Mean Annual Temperature: Per Local
See the National Climatic Data Center data table “Air Freezing Index-USA Method (Base 32o Fahrenheit).” - Wildfire Risk: Per Local
- Fire Suppression: Per Local
Currently Adopted Codes are as follows, with amendments within Rule 2 of the Administrative Rules 8 CCR 1032-14:
- 2021 International Building Code (IBC)
- 2021 International Residential Code (IRC)
- 2021 International Plumbing Code (IPC)
- 2021 International Mechanical Code (IMC)
- 2021 International Fuel Gas Code (IFGC)
- 2023 National Electric Code (NEC) - The Division of Housing will update to the newest version of the NEC when the State Electrical Board adopts a newer version of the code.
- Colorado Model Electric Code
On-site Construction Inspections
On-site Construction (OC), as defined by DOH, are items that have to be completed on site, to complete the compliance of the structure. These items can vary, but do not relate to the installation of the structure, nor items built on site for attached/detached structures, or utility work. Typical site-built items that are permitted by local governments include, but are not limited to, garages, patios, patio covers, decks, external stairs, and carports.
Items that relate to OC include, but are not limited to, the completion of insulation at the crawlspace or basement for thermal envelope, under floor plumbing and gas to complete the plumbing system to utility connection, mechanical and plumbing vents above the hinge of a hinged roof system, drywall on the exterior of home where an onsite attached garage will be built, dormers, and exterior fixtures.
These OC items are required to be placed on our OC form, by the manufacturer, for review and approval by DOH. This form is then submitted to the local government for the review to either accept the responsibility of the inspection of these items, to the DOH approved plans, or deferred back to the manufacturer, who then can decide if a DOH third party agency will be contracted to do the inspection or DOH.
Review the On-site Construction Form for further information.
Foundation Requirements
As mentioned above, there are over 300 jurisdictions with active building departments, these jurisdictions have complete authority over the plan review, inspection and approval for the construction of foundation systems within its jurisdiction. The only requirement that DOH enforces through C.R.S. Title 24-32-33 and in the Administrative Rules 8 CCR 1302-14, is that a permanent or temporary foundation system that is designed for the installation of manufactured buildings, must be engineered.
If you are in a jurisdiction that does not have a building department or you are curious about the requirements for those jurisdictions, please look at the Jurisdiction without Building Departments section.
Participating Jurisdictions
Participating jurisdictions (PJs) are jurisdictions that opt into the DOH installation program to assist with the installation inspections of manufactured homes, multifamily, and tiny homes in Colorado. These PJs are approved by DOH to conduct installation inspections after they have submitted an application and attended required installation training. For more information please contact our Manufactured Home Installation Program Coordinator at dola_mhip@state.co.us.
Manufactured homes, tiny homes, and multi-family structures installed in a participating jurisdiction must schedule installation inspections with the local building department. These jurisdictions have been authorized to complete inspections on the behalf of the Division of Housing.