What to Include in an ADU Blueprint

When preparing to build an Accessory Dwelling Unit (ADU), many homeowners ask: What exactly should an ADU blueprint include to ensure fast permit approval?

A strong, professional ADU blue print, often based on a preapproved ADU plan or permit ready ADU plans, makes the permit process smoother, avoids costly corrections, and speeds up construction.

1. Site Plan

The site plan must show:

• Entire property layout

• Location of the main home and the ADU

• Property lines and dimensions

• Required setbacks from all structures and property edges

• Parking locations (if required)

Submitting a clean site plan is critical for zoning approval of your ADU permit.

2. Floor Plan

The floor plan provides:

• Interior room layout with dimensions

• Door and window placements

• Kitchen and bathroom configurations

• Room labels (living room, bedroom, bathroom, etc.)

A detailed floor plan, such as those in permit ready ADU plans, helps building officials quickly understand your design.

3. Building Elevations

Building elevations must include:

• Front, rear, and side views of the ADU

• Exterior finishes (stucco, siding, brick, etc.)

• Roof slopes

• Overall height of the structure

Matching elevations are often required when submitting a preapproved ADU plan.

4. Foundation and Structural Plans

To pass structural review, you must show:

• Foundation type (slab, raised floor, etc.)

• Wall framing details

• Roof construction

• Structural connections and seismic anchoring (especially in California)

A complete ADU blue print avoids expensive redesigns later.

5. Plumbing, Mechanical, and Electrical (PME) Plans

PME plans display:

• Locations of sinks, toilets, showers, and appliances

• Electrical panels, outlets, switches, and lights

• Heating and cooling systems (HVAC)

Clear PME plans are essential for passing city inspections and securing your ADU permit.

6. Title 24 Energy Compliance Documentation

California requires ADUs to meet energy efficiency standards.A Title 24 report must align with:

• Insulation R-values

• Window performance ratings

• HVAC system efficiency

Permit ready ADU plans usually include Title 24 compliance built into the design.

Why Good Blueprints Matter

City officials rely on accurate ADU blue prints to:

• Verify code compliance

• Confirm zoning rules are followed

• Ensure life and safety standards are met

Incomplete or messy blueprints are a major cause of permit delays.

Real-World Example

A homeowner in Walnut Creek submitted a complete permit package featuring a preapproved ADU plan and professionally drawn ADU blue print. The project was approved within seven weeks — with no resubmittal or corrections required.

Common Mistakes to Avoid

• Missing room dimensions

• Forgetting smoke and carbon monoxide detector placements

• No notes on insulation or energy compliance

• Confusing plumbing or electrical layouts

Final Thoughts

A well-prepared ADU blueprint is the foundation of a smooth permitting process and successful construction project. At ADUnest, we help homeowners create detailed ADU blueprints, select preapproved ADU plans, and submit permit ready ADU plans that meet all city and state requirements. If you have any questions about creating your ADU blue print, feel free to leave a comment below — the ADUnest team will assist you every step of the way!