Calculate Your ADU Remodel Budget with Our Online Estimator

Step 1: Establish a baseline construction cost

• The calculator starts with a base unit cost that reflects typical ADU construction pricing.
• It scales that baseline using your square footage.

Step 2: Apply ADU-style adjustments

• A detached ADU generally costs more than an attached one because it requires separate foundation work, potentially more utility trenching, and standalone exterior construction.
• A garage conversion may reduce certain structural costs but can increase others if the slab, framing, or utilities need major upgrades.
• The calculator applies style-based multipliers so the estimate matches the build type.

Step 3: Factor in your finish level

• Basic finishes typically mean simpler cabinetry, standard fixtures, and budget-friendly flooring.
• Mid-range finishes bring better durability, improved aesthetics, and more choices.
• High-end finishes usually mean premium materials, custom details, and higher labor time.
• The calculator increases or decreases the estimate using finish multipliers to reflect these differences.

Step 4: Add design-build service costs

• Service level affects how comprehensive your design-build process is.
• A premium service level generally includes deeper design collaboration, stronger project management coverage, and more coordination support.

Step 5: Calculate soft costs
These can include:

• Architectural design & drawings
• Structural engineering
• Permitting and plan check allowances
• Project management
• Optional design support like interior selections (depending on service scope)