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How ADU Plan Modifications Work

See how stock ADU plans can be adapted for different properties, lifestyles, dimensions, and design preferences.

Plan Buying•5 min read

Stock plans give homeowners a proven starting point without beginning every project from a blank sheet of paper. When the design is close but not quite right, plan modifications can bridge the gap.

Common plan modifications

Move interior walls

Resize rooms

Adjust the overall width or depth

Change windows and doors

Modify kitchen layouts

Reconfigure bathrooms

Add accessibility features

Change exterior materials

Modify porches

Adjust roof or exterior details

Start with the closest plan possible

Modifications work best when the stock plan already solves most of the project. If nearly every room, dimension, roofline, and exterior feature needs to change, a custom design may eventually make more sense.

Describe the changes clearly

Provide as much detail as possible when requesting a quote. Sketches, screenshots, marked-up floor plans, inspiration images, dimensions, and written notes can all help communicate the desired result.

Property requirements may drive modifications

Sometimes the homeowner wants a change. Other times the property requires it. A narrower footprint, different window location, alternate foundation, or accessibility feature may be necessary because of the building site or intended use.

Local requirements still apply

Changing a stock plan does not automatically make it compliant with every local requirement. Engineering, site-specific design, and jurisdiction review may still be necessary.

Project requirements vary.

Best ADU Plans provides general educational information. Zoning, building codes, engineering, permitting, utilities, and property conditions should be verified for the specific project and jurisdiction.

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Local ADU requirements vary. Always verify current zoning, permitting, and property requirements with the applicable jurisdiction.

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