ADU Cost Calculator

Get quick ADU cost estimates based on real Los Angeles construction data and California regulations.

Plan Your Accessory Dwelling Unit with Confidence

Building an Accessory Dwelling Unit (ADU) is an excellent way to add value to your property, create rental income, or provide extra living space for family members. But before you start, it’s important to understand the potential costs involved.

Our ADU Cost Calculator gives you a quick, realistic estimate for your project — whether you’re planning a detached ADU, garage conversion, junior ADU, or an addition to your home.

How the ADU Calculator Works

Our ADU calculator is designed to guide homeowners through the early budgeting stage. In just a few clicks, you can enter your desired ADU size, type, level of finishes, and location to see an estimated price range.

The calculation includes:

Estimated construction costs based on size (from 200 sq ft studios to 1,200 sq ft multi-bedroom units).
Site preparation and utility connections.
Permitting and city fees.
Finish level (basic, standard, or high-end).

This tool is ideal for anyone exploring ADU floor plans and wanting to compare different configurations before committing to a design.

Start Your Project

Building in Los Angeles or Southern California?

Construction costs here often differ from the California average due to higher labor rates, stricter permitting, and site-specific challenges. Our ADU Cost Calculator Los Angeles takes into account:

Local construction prices and contractor availability.
City-specific plan check and permit fees.
Additional requirements for hillside, historic, or coastal properties.

This localized approach gives you a more precise budget estimate — tailored to your specific location and site conditions.

Factors That Affect ADU Cost in California

While our calculator provides a reliable estimate, actual project costs depend on multiple factors, including:

Lot conditions — slope, soil type, and accessibility for construction crews.
Existing structures — converting a garage or basement may cost less than new construction.
Design complexity — custom layouts or architectural features can increase costs.
Utility upgrades — adding new water, sewer, or electrical lines.
Code requirements — seismic retrofitting, fire sprinklers, energy compliance (Title 24).

Ataman Studio designs every ADU with California’s building codes in mind, ensuring your project moves smoothly from concept to completion.

From Estimate to Build-Ready Plans

Once you have your estimate, our team can provide:

Custom ADU design tailored to your property and goals.
CAD drafting services for city approval.
Permit management to handle all communication with local agencies.
Construction support to ensure your project matches the approved plans.

Use the ADU Cost Calculator to get your initial budget estimate, then connect with Ataman Studio for a detailed proposal and build-ready plans. Whether you’re in Los Angeles or anywhere in California, our expertise in ADU design, drafting, and permitting will save you time and help you avoid costly mistakes.

Get your ADU estimate now and take the first step toward transforming your property.

Compare ADU Costs by Size

200 sq ft 300 sq ft 400 sq ft 500 sq ft 600 sq ft 700 sq ft 800 sq ft 900 sq ft 1000 sq ft 1100 sq ft 1200 sq ft

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