2012 IECC Information Page

MD IECC Update

As of July 1, the 2012 IECC is in effect in the state of Maryland.  Most counties have adopted the code through their regular building code adoption process, however, some counties have not formally adopted the code.  Regardless of whether or not a jurisdiction is enforcing the new code, builders applying for building permits after July 1 should be prepared to build to the 2012 IECC.  

If you have any questions, please contact the local building code official listed below for each jurisdiction, or call HBAM at (410) 265-7400.

2012 IECC Training in Howard County

Howard County is offering a free 2012 IECC Training on August 21, 2012.  The class is only open to 150 participants, so you need to register ASAP.  It will be taught by an ICC Certified Instructor.  For more information and to register, click the following links: 

Click Here to view the Flyer with more information

Click Here to Register

What's new in the 2012 IECC?

Insulation Requirements



Wood Frame


Crawl Space

 1 30 13  0 0
 2 38 13 0 0
 3 38  20 or 13 + 5  5/13 5/13
 4 expt Marine 49  20 or 13 + 5    10/13 10/13
 4 Marine & 5 49  20 or 13 + 5 15/19 15/19
 6 49  20+5 or 13 + 10   15/19 15/19
 7 & 8 49  20+5 or 13 + 10   15/19 15/19


Fenestration Requirements
1 0.65 0.75 0.25
2 0.40 0.65 0.25
3 0.35 0.55 0.25
4 except Marine 0.35 0.55 0.40
4 Marine & 5 0.32 0.55 N/A
6 0.32 0.55 N/A
7 & 8 0.32 0.55 N/A
Duct Leakage

Total duct leakage testing is mandatory unless HVAC equipment and ducts are within the thermal envelope.  The following table shows the 2012 requirements compared to the 2009 IECC.

Total Duct Leakage

25 CFM per 100 sqft CFA

Construction Phase 2009
Post Construction 12 4
Rough-In 6 4
Rough-In if air handler
not yet installed
4 3

Duct Leakage is measured in cubic feet per minute (CFM) at a pressure of 25 Pascals for every 100 sq.ft. of conditioned floor space (CFA).

Thermal Envelope

The 2012 IECC requires ALL homes be tested for air leakage with a blower door test. In Maryland, air leakage cannot exceed 3 air exchanges per hour at 50 Pascals.

It is important to note that many county's in the HBAM area are interpreting this requirement slightly different because of rounding decimal places, so be sure and check with your local building code official to find out what will be accepted.  For instance, some counties will only accept 3.0 and less, some are accepting 3.5 and less, and at least one is going so far as accepting 3.99 or less.

Hot Water Piping

Hot water piping must be insulated to at least R-3 if the piping falls into one of the following groups:

  • Piping is larger than 3/4" in nominal diameter,
  • Piping serves more than one dwelling unit,
  • Piping runs from water heater to kitchen outlets,
  • Piping is located outside of conditioned space,
  • Piping runs from water heater to a distribution manifold,
  • Piping is located under a floor slab,
  • Piping is buried,
  • Supply and return Piping is in recirculation systems other than demand recirculation systems, and
  • Piping run lengths exceed the following maximum run lengths for a nominal pipe diameter:
Nominal Diameter of largest
pipe diameter in run
3/8" 1/2" 3/4" >3/4"
Max Run Length 30 ft 20 ft 10 ft 5 ft


75% of lighting fixtures must be energy efficient.  This is an increase from 50% in the 2009 IECC.
Additional Requirements

Builders must complete and post this certificate sticker on the electric panels of every home.  Most counties will give them out for free at permit application, however some counties will charge you.  This sticker will show results from duct system and air leakage tests in addition to insulation R-values, fenestration U-factors & SHGCs, and heating type and efficiency.


Energy Efficient Certificate Sticker

Local Information

Each County in the HBAM area is developing its own compliance checklist and forms.  Here are the important documents for each county as well as contact information if you have questions about the code:

Anne Arundel Inspections and Permits
William R. Bryant, MCP
Acting Director

No Documents Published as of July 18
Baltimore City
info coming soon
Baltimore County Permits, Approvals and Inspections

Glenn Berry
Chief, Building Inspector
410-887-3953 - Office

Important Documents for Baltimore County:

Residential Energy Conservation Code Introduction

Energy Efficiency Certificate of Compliance (PDF)

Notice to all Residential Permit Applicants

Carroll County Bureau of Permits and Inspections

Jason C. Green, Bureau Chief
410-386-2674, 1-888-302-8978

Important Documents for Carroll County:

Noteworthy Changes to the 2012 IECC

2012 IECC Residential Certificate Sticker

2012 IECC Flow Chart Application

Cecil County
info coming soon
Harford County Inspections, Licenses and Permits

Richard C. Truitt, Sr.
Deputy Director, Inspections, Licenses and Permits
(410) 638-3366

Important Harford County Documents:

2012 IECC Residential Energy Efficiency Code Flow Chart and Documentation for Permit

Howard County Inspections, Licenses and Permits

Don Mock, P.E.
Plan Review Chief

Important Howard County Documents:

Energy Conservation Code Information

2012 IECC Residential Energy Flow Chart 

2012 IECC Residential Energy Requirements 

2012 Residential Energy Checklist