An LMCC — Low-Rise Multifamily Compliance Certificate — is the Title 24 Part 6 compliance document for low-rise multifamily residential buildings. This includes duplexes, triplexes, fourplexes, and apartment buildings up to three stories.
Where a CF1R covers single-family residential energy compliance, the LMCC covers multi-unit residential buildings: lighting, mechanical HVAC systems, controls, envelope performance, water heating, and, where they apply, solar and battery requirements. For a side-by-side comparison, see CF1R vs LMCC.
LMCC reports are generated using CEC-approved compliance software and must be registered with an approved California registry before permit submission. Complexity varies significantly by project scope — a simple duplex is straightforward, while a larger multifamily building with complex HVAC zoning requires a full envelope and mechanical analysis.
When is an LMCC required?
Any time you pull permits for a new low-rise multifamily building or a significant addition or alteration to one. Your local building department will confirm the requirement, but in most cases any new multi-unit residential structure up to three stories will require an LMCC.
How an LMCC Is Prepared
Most new multifamily buildings comply using the performance method: the building is modeled in CEC-approved software and compared with a code-defined standard design for the same building in the same climate zone. The model has to account for things a single-family model does not — different unit types, shared walls and floors between units, corridors or common areas, and whether each unit has its own system or shares central equipment. Title 24 calculations explains the method, and Title 24 requirements covers the mandatory measures that apply either way.
What to Provide for an LMCC
- Floor plans for each unit type and the overall building, with unit count
- Elevations and a window schedule
- Wall, roof and floor assemblies, including walls and floors between units
- Heating, cooling and ventilation for each unit, or the central system
- Water heating — individual heaters or a central system
- Common-area and exterior lighting, where included in the scope
See what documents to upload for the full list.
After the Permit: Verification
Like a CF1R, an LMCC can flag items for field verification by a HERS (ECC) rater, such as duct leakage or ventilation airflow. Results are recorded in the same data registry where the LMCC is registered. See what CHEERS is and HERS rater vs Title 24 report.
Title24Comply's multifamily report starts at $345 per building for up to 4,000 sq ft with 4 units — affordable fixed-rate pricing for LMCC reports in California.
Frequently Asked Questions
Does an ADU need an LMCC?
No. A single ADU uses a CF1R, even on a lot with an existing house. See ADU Title 24 reports.
What about a building with shops on the ground floor?
The residential units use multifamily forms, and nonresidential spaces use the NRCC forms. Request a quote through our commercial Title 24 form.
How is an LMCC priced for more units?
Additional square footage beyond 4,000 sq ft is $25 per 500 sq ft, and each unit beyond four is $95.