Experienced ADU Builders Specializing in Every Type of Accessory Dwelling Unit
Custom ADU Builder is a team of experienced professionals specializing in the construction of accessory dwelling units. Once a homeowner has their city-approved plans in hand and the permit is pulled, Custom ADU Builder gets to work — with an average completion time of just 3 months. Whether the project is a detached ADU, an attached ADU, or a garage conversion, they have the expertise and resources to deliver.
As a trusted ADU contractor, Custom ADU Builder handles a wide range of project types, including:
- Detached ADUs up to 1,200 square feet
- Attached ADUs around 500 square feet
- Garage conversions starting at approximately 350 square feet
- Junior ADUs (JADUs) quoted on a case-by-case basis
Their pricing is competitive. Detached ADU construction starts at $235 per square foot for units larger than 850 square feet, while garage conversions can start at $85,000 depending on the size of the space. In many cases, they can also split electric, water, and gas utilities so the ADU operates on completely separate utility bills from the main house.
Attached JADU projects are more complex to estimate, as cities often require homeowners to bring certain aspects of the main house up to code. Factors that can affect pricing include high-end designer finishes, difficult utility positioning, matching non-standard exterior features like tile roofs or smooth stucco, and building on a slope.
Quality Finishes That Set Them Apart
What distinguishes Custom ADU Builder as a leading accessory dwelling unit builder is their commitment to quality from the ground up. Their standard finishes are considered upgrades by many other contractors in the industry. Every project begins with:
- Quartz countertops
- Full tile showers extending to the ceiling
- 100% waterproof luxury vinyl plank flooring
For clients who want to go further, upgrades such as hardwood flooring, designer tile, or waterfall quartz countertops are available. However, Custom ADU Builder's philosophy centers on using durable, long-lasting materials that appeal to the widest range of potential tenants — maximizing return on investment for income-producing ADUs.
A Truly Turn-Key ADU Building Experience
Custom ADU Builder keeps things simple when it comes to what's included in their price: everything needed to move in. From cabinet knobs to the ice line behind the refrigerator, no detail is overlooked. Their all-inclusive approach means homeowners don't have to worry about hidden costs or forgotten line items.
The only exclusions from their pricing are:
- Blueprints and permit fees
- Solar panels (if required or desired)
- Landscaping
- Appliances
Everything else is covered. As a full-service granny flat builder and garage conversion contractor, Custom ADU Builder delivers a seamless, stress-free process from permit approval to move-in day — making them a top choice for homeowners looking to add value and livable space to their property.
