United StatesMaryland

(2012 IECC) county and municipal codes (Maryland)

Applicable Building Type(s)

New residential

Policy Requirement Level


Policy Sequence


Development Authority: International Code Commission

Implementation Authority: Maryland counties and municipalities

Prescriptive Compliance path

Energy Requirements:


U-Values (Btu/h.ft2)FloorRoofWallsWindows
Climate zone 1 0.064 0.035 0.197 0.5
Climate zone 2 0.064 0.03 0.165 0.4
Climate zone 3A and 3B 0.047 0.03 0.098 0.35
Climate zone 4C 0.033 0.026 0.082 0.32
Climate zone 5 0.033 0.026 0.082 0.32
Climate zone 6 0.033 0.026 0.06 0.32
Climate zone 7 0.028 0.026 0.057 0.32
Climate zone 8 0.028 0.026 0.057 0.32


U-Values (W/m2.K)Solar energy gains
Climate zone 1 0.25
Climate zone 2 0.25
Climate zone 3A and 3B 0.25
Climate zone 4A and 4B 0.4


Skylights are 0.75 W/m2.k zone 1, 0.65 W/m2.k zone 2 and 0.55 W/m2.k zones 3-8

Air Leakage

5 ACH tested at 50 Pa for climate zones 1 and 2. 3 ACH tested at 50 Pa for climate zones 3-8 Recessed luminaries must be sealed, rated and labelled as < 0.944L/s tested at 75 Pa

Space Heating System

Thermostatic controls are mandatory and programable ones are required where the primary heating system is a forced-air furnace. Ducts must be sealed and insulated and duct tightness must be verified with a postconstruction test or a rough-in test. Ventilation, equipment sizing, snow melt controls and pool systems are mandatory and detailed on IECC 2012 p.35.

Water Heating System

Circulating hot water systems must have an automatic or readily accessible manual switch that can turn off the pump when the system is not in use. Insulation is prescribed.


75% of permanently installed lamps or lighting fixtures must be high-efficacy lamps

Compliance Softwares:

End-uses considered:

Space cooling, Space heating, Water heating, Ventilation

Performance Compliance path

Not a requirement. Performance based elements are based on a reference model and are relative to energy costs

Energy Requirements:



Climate zones