Updated : 04/22/2024

Overview

Boulder County, CO adopts the following codes:

• The International Building Code, 2015 edition, including specifically Appendix Chapters C, I, J, and K, with amendments.
• The International Residential Code, 2015 edition, including specifically Appendix Chapters E, F, H, R, and S, with amendments.
• The International Existing Building Code, 2015 edition, with amendments.

ADOPTION OF MODEL CODES BY REFERENCE, WITH DELETIONS AND AMENDMENTS.

Helpful resources for Boulder County, Colorado include the following.

• PLRB, Ordinance and Law Coverage Discussion for Colorado

Residential Building Code

Colorado has yet to adopt a statewide residential code. Local laws will control.See PLRB, Colorado Building Codes for more information on state level codes.

Boulder County adopted the 2015 IRC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the model code here.

You can find information about amendments to the model code here.

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2018 IRC(Boulder, CO 10-5.5-2. - Adoption of the International Residential Code With Modifications.)

...(a) The 2018 edition of the International Residential Code of the International Code Council is hereby adopted by reference as the City of Boulder Residential Building Code and has the same force and effect as though fully set forth in this chapter, except as specifically amended by the provisions...

Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for Boulder County ? Yes
Citation: Boulder County, CO 2015 IRC amendments.
Municipal Code https://assets.bouldercounty.org/wp-content/uploadshttps://assets.bouldercounty.gov/wp-content/uploads/2017/03/building-code- 2015.pdf#page=26/2017/03/building-code-2015.pdf#page=22
Comments:

TABLE R301.2(1)

CLIMATIC AND GEOGRAPHIC DESIGN CRITERIA

GROUND SNOW LOAD	Varies
WIND SPEED	Varies
TOPOGRAPHIC EFFECTS	No
SPECIAL WIND REGION	Yes
SEISMIC DESIGN CATEGORY	B
WEATHERING	Severe
FROST LINE DEPTH	30”
TERMITE	Slight to Moderate
WINTER DESIGN TEMPERATURE	1° F.
SUMMER DESIGN TEMPERATURE	91° F.
ICE BARRIER UNDERLAYMENT REQUIRED	Yes
FLOOD HAZARDS	Yes
AIR FREEZING INDEX	1000
ANNUAL MEAN TEMPERATURE	50° F.
ANTICIPATED SNOW DEPTH Plains Mountains	12 inches 24 inches

Boulder County, CO Design Criteria.

Comments

Boulder County, CO adopts the International Residential Code, 2015 edition, including specifically Appendix Chapters E, F, H, R, and S, with amendments.

Existing Buildings

Existing buildings, meaning buildings that were built in accordance to code at the time of construction, typically merit extra consideration in a current updated code.

There is no mention of the adoption of Appendix J of the 2015 IRC.

Commercial Building Code

Boulder County adopted the 2015 IBC, locally. Note that adoptions usually come with amendments. So, it is important to review those amendments in addition to the unamended model code.

You can find a copy of the code here.You can find information about amendments to the model code here.

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2018 IBC(Boulder, CO 10-5-2. - Adoption of International Building Code With Modifications.)

...(a) The 2018 edition of the International Building Code of the International Code Council is hereby adopted by reference as the City of Boulder Building Code and has the same force and effect as though fully set forth in this chapter, except as specifically amended by the provisions of this chapter....

Comments

Boulder County, CO adopts the International Building Code, 2015 edition, including specifically Appendix Chapters C, I, J and K, with amendments.

Existing Buildings

Boulder County, CO adopts the International Existing Building Code, 2015 edition, with amendments.

Other Building Codes