If you ask a contractor for an estimate, you’ll most likely get a quote that’s just plain wrong. We’re talking a +/- 30% difference (or worse). 30% too high, and you won’t get the best value for your money. 30% too low, and you may be left with a hole in the ground while you scramble for financing.

The secondary home includes a bedroom, a kitchen, a bathroom, a living area, and an office. It will save the family more than $3,000 per month in rent and allow them to live together, helping each other and being near one another every day. Here are the plans.

A homeowner in Oakland wanted to add space to her home that could be used as storage, a guest room, a laundry room, or a home office. New Avenue created this accessory building to enhance her property, making her home into a place that better suits her busy life.

For many homeowners, adding an accessory structure like this makes it possible to stay in the neighborhood they love. It’s an efficient way to add square footage to your home without the expense and difficulty of buying a new home in the area.

This ADU is loaded with extraordinary features including solar energy, an incredible storage loft, an accessible bathroom, and luxurious finishes.

Erin’s new attached ADU can be used as a guest suite, additional space for the homeowner, a home for family, or a rental unit. This kind of ADU rents for $2,500 or more per month, which will be enough to pay for the project and additional expenses such as helping with the mortgage on the main home, travel, education, leisure activities, or retirement.

When California passed AB 68, among other groundbreaking legislation related to ADUs, we were thrilled. The new laws gave California homeowners more rights related to adding ADUs to their property, including the right to add two accessory dwellings. So for most homeowners, the answer is yes, you can add two ADUs. Here’s a look at some plans for adding two ADUs developed for a client in Berkeley.

The homeowners’ New Avenue design professional created a home with one bedroom, a bathroom, a washer/dryer, a kitchen, and a living area with bamboo flooring. The family will be able to bring in around $3,000 per month in rental income. The ADU will pay for itself in no time, and they can also use the income to pay for the mortgage on the main home, education, travel, or anything else they may need.

New Avenue assessed the property to help the homeowners determine the best course of action. We found that the old ADU was built in 1932, at the same time as the main home. Structural damage, a weak foundation, and asbestos made the original cottage unsuitable as a home.

The family opted to build a new ADU. New Avenue’s experienced design professional created an accessory dwelling that fit beautifully on the property.

Many people replace their detached garages with ADUs, scrapping the garage entirely. Others say, “Why not both?” and add an ADU over their garage. For this project in Berkeley, the homeowners contacted New Avenue to create an entirely new two-car garage with an apartment over it. Here's the design.