Multi-Family

Multi-family buildings split between the single-family and the multifamily rules depending on the number of units and stories. These pages cover the small building types, additions and unit remodels, common areas and replacements.

In this section

• Duplex, triplex and fourplex (7)
• Additions and unit remodels (4)
• Common areas (5)
• Replacements and testing (6)

Duplex, triplex and fourplex

How many reports a small building needs and which rules apply to each unit count.

1. Does a Duplex Need Title 24?
2. Do Triplexes and Fourplexes Need Title 24?
3. Townhome and Rowhouse Title 24 Report
4. Do Apartments Need Title 24?
5. Duplex Title 24: One Report or Two?
6. Triplex Title 24 Requirements
7. Fourplex Title 24 Requirements

Additions and unit remodels

Adding to a multifamily building and remodeling an apartment unit.

1. Does a Multi-Family Remodel Need Title 24?
2. Adaptive Reuse and Title 24
3. Multifamily Addition Title 24 Requirements
4. Apartment Unit Remodel Title 24 Requirements

Common areas

Lighting and HVAC in corridors, lobbies and shared spaces.

1. Multifamily Lighting Under Title 24
2. Does Multi-Family HVAC Work Need Title 24?
3. Multifamily Ventilation Requirements
4. Multifamily Common Area Lighting Title 24 Requirements
5. Multifamily Common Area HVAC Title 24 Requirements

Replacements and testing

Water heater and roof replacement, and acceptance testing before final inspection.

1. Multifamily Water Heating Requirements
2. Apartment Window Replacement Under Title 24
3. Multifamily Solar and Battery Requirements
4. Multifamily Water Heater Replacement Title 24 Requirements
5. Multifamily Roof Replacement Title 24 Requirements
6. Multifamily Acceptance Testing Before Final Inspection

For the bigger picture, see everything you need to know about Title 24, the requirements overview and all Title 24 questions.