Updated : 04/22/2024

Overview

St. Louis County, MO has adopted the 2015 International Codes including the 2015 IRC (for One and Two Family Dwellings) and IBC. St. Louis County, MO County Codes § 1116.020 (IRC adoption), § 1116.101 through § 1116.144 (IRC amendments), § 1115.020 (IBC adoption) and § 1115.101 through § 1115.136 (IBC amendments).

Helpful resources for St. Louis County, Missouri include the following.

• PLRB, Ordinance and Law Coverage Discussion for Missouri

Residential Building Code

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

St. Louis 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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2015 IRC(St. Louis County, MO 1116.020 - Residential Code for One- and Two-Family Dwellings Adopted.)

...of the Administrative Director, being marked and designated as the International Residential Code for One- and Two-Family Dwellings, 2015 edition, including "APPENDIX K - SOUND TRANSMISSION," as published by the International Code Council, is hereby adopted as the Residential Code of St. Louis County, for regulating and governing the construction,...

Drip Edge

Drip Edge: yes

Ice Barrier

Are ice barriers required for St. Louis County ? No
Citation: St. Louis County, MO County Code § 25.11.020
Municipal Code https://library.municode.com/mo/st._louis_county/codes/code_of_ordinances?nodeId=TITXIPUWOBURE_CH1116RECO_1116.103AMINRECOOMIDW2015EDHA3BUPL
Comments:

TABLE R301.2(1) Climatic and Geographic Design Criteria

Ground Snow Load (lbs./ft. 2 )	Wind Design				Seismic Design Category f	Subject to Damage from			Winter Design Temp e	Ice Barrier Under-Layment Required h	Flood Hazards g	Air Freezing Index i	Mean Annual Temp j
	Speed d (mph)	Topographic effects k	Special Wind Region l	Wind-borne debris zone m		Weathering a	Frost line depth b	Termite c
20	V ult = 115 V asd = 89	NO	NO	NO	C	Severe	30 inches (762 mm)	Slight to Moderate	2° F	NO	May 24, 1985	1,000 days	55.2° F

Government Officials

Comments

St. Louis County, MO adopted the 2015 IRC including appendix K.  St. Louis County, MO County Code § 1116.020. 

For information regarding Automatic Fire Sprinkler Systems see St. Louis County, MO County Code § 1116.101 (see Sections R313.1 through R313.2.1).

Commercial Building Code

St. Louis County adopted the 2015 IBC, statewide. 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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See Muni. Code(St. Louis County, MO Municipal Code)

...Adoption not found...

Comments

St. Louis County, MO adopted the 2015 IBC including appendices C and H.  St. Louis County, MO County Code § 1115.020. 

Existing Buildings

St. Louis County MO adopted the 2015 IEBC. St. Louis County, MO County Codes § 1117.020 (adoption) and § 1117.101 through § 1117.116(amendments.)

Other Building Codes