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ADU's - Granny Flats - Second Dwellings

Recent changes to ADU's (Accessory Dwelling Units) have made them easier than ever to get permitted. The County of San Diego even has pre-approved plans for free.  Below are a few examples of County standard plans.

1200 square foot ADU
2 bedroom and 2 bathrooms

This is Plan C from the County of San Diego's pre-approved plan list. This plan has 2 bedrooms, 2 bathrooms, and an open design with the kitchen and living room area.

How much does an ADU          Cost?  $280,000*

Some included features:*

  • Custom Paint Grade Cabinets

  • Tile Showers

  • Solid Surface countertop(quartz stone, granite...)

  • Vinyl plank flooring throughout.

  • Tile flooring in bathrooms.

  • Custom closets

  • Asphalt shingle roof and Stucco

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This plan C we built has asphalt shingle roof and a stucco finish.

This is a modified version of the Plan C kitchen, adding a large pantry area.

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Plan C modified Kitchen.

This is a variation with a shower instead of a tub

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1000 square foot ADU
1 Bedroom and 1.5 Bathrooms

(Possible conversion to 2 bedrooms and 2 bathrooms)

This is the Plan D from the County of San Diego pre-approved plans.

How much does a second dwelling cost? $240,000*

Some included features:*

  • Custom Paint Grade Cabinets

  • Tile Showers

  • Solid Surface countertop(quartz stone, granite...)

  • Vinyl plank flooring throughout.

  • Tile flooring in bathrooms.

  • Custom closets

  • Asphalt shingle roof and Stucco

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Custom ADU

Can't find a pre-approved plan you like or maybe it doesn't fit your property, or you want to add a garage to it as well? We can get you in touch with a designer and create a custom ADU to fit your needs.

Costs: A custom designed ADU is a longer and more expensive process but you get to create the perfect house for you. On average, the living space is around $250 - $300 a square foot while the garage is $100 a square foot and covered patios are about $40 a sqft.* Prices can vary drastically based on design.

Additional Costs:

Permit process

The permit process varies greatly depending on the area you live in. It could be as quick as two months and as long as a year+ to get a permit. Also, while many of the permit fees are waived, there are still some permit fees, and school fees. These also vary but $8 to $10* a square foot is a rough idea.

Site Development

Each property is unique and will require a site visit from us to address the needs of the house. All houses will need to have a graded and certified house pad. They will also need to have utilities, such as power, sewer, and water to the house. We can typically do this for around $20,000* but the price could vary wildly based on the property.

* Prices listed on this website are for informational purposes only and are not an official price estimate. Coble Homes must visit the site and then will give the customer a formal estimate based on the unique conditions of each property. Coble Homes only takes on as much work as they can handle, and as such may not always be available for hire. Reach out to us for current availability and pricing.

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ADU Information

Want to see all the pre-approved plans from the county of San Diego? Here is a link:

https://www.sandiegocounty.gov/content/sdc/pds/bldg/adu_plans.html

Go here for additional information if you are in the county of San Diego:

https://www.sandiegocounty.gov/pds/bldg/adu.html

For all other cities, check with your local building department for current information. Also, check with the Fire Department regarding their requirements. If you are on a septic system, your local health department can give you information if your system needs to be expanded.

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