Free Estimation Tool
ADU & SB9
Cost Estimator
From garage conversions to brand-new detached units and SB9 developments — get a realistic cost estimate for your Los Angeles ADU project in minutes.
Full turnkey: Design, permits, and construction all included in every estimate.
ADU Type
Step 1
Step 1 · Project Type
What type of ADU are you building?
Select the option that best describes your project. Each type has different requirements, timelines, and costs.
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JADU
Junior ADU (JADU)
Convert an existing bedroom, attached garage, or interior space — max 500 sq ft. No new foundation needed. Shares entrance with main home.
💚 Most affordable ADU option
🏗️
ADU Attached
Attached ADU
A new addition connected to your existing home — own entrance, kitchen, and bathroom. Built on a new foundation attached to the house.
🟡 Mid-range — new construction attached
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ADU Detached
Detached ADU
A completely separate structure in your backyard — own foundation, utilities, entrance. Maximum privacy and rental potential. Most popular in LA.
🟡 Higher — standalone structure
🏘️
SB9
SB9 — New Principal Unit
California law allows up to 2 principal dwelling units on a single-family lot. Build a full second home — not limited to 500 sq ft like an ADU.
🔴 Higher — full new dwelling unit
🏘️🏡
SB9 + ADU
SB9 Unit + ADU — Maximum Development
The most you can build on a single-family lot under California law. One new SB9 principal unit + one ADU on the same property. Up to 4 total units possible with lot split.
🔴 Highest scope — full property development
Step 2 · About Your Project
Tell us about your project
A few details help us build an accurate estimate.
Size of the ADU
Step 3 · Foundation & Structure
Foundation and structure details
These factors significantly affect the overall cost of your project.
Foundation type
Slab on Grade
Concrete slab poured directly on ground. Most common and cost-effective.
💚 Standard cost
Raised / Pier & Beam
Elevated foundation — matches older LA homes or sloped lots.
🟡 Moderate addition
Using Existing Foundation
Existing concrete pad, driveway, or structure — no new foundation needed.
💚 Saves significant cost
Roof type
Flat / Low Slope
Modern look — common for ADUs and detached structures in LA.
💚 Cost-effective framing
Gable / Pitched
Classic peaked roof — matches traditional home styles.
🟡 Moderate — more framing
Match Existing Home
Tie into or match the main home’s roofline — best for attached ADUs.
🟡 Depends on existing style
Parking impact
✓ No Parking Impact
No existing garage or parking to remove. No replacement required.
💚 No added scope
Replacing Existing Parking
Converting garage or driveway — replacement parking may be required depending on transit proximity.
🟡 May require replacement parking structure
Step 4 · Interior Scope
What’s inside the ADU?
Every ADU needs a kitchen, bathroom, and living area. Select the features and finishes planned for your unit.
Kitchen type
Kitchenette
Mini-fridge, microwave, 2-burner cooktop — no full range or dishwasher. Common in JADUs.
💚 Lower scope
Standard Kitchen
Full range, sink, cabinets, countertop, refrigerator space. Standard ADU kitchen.
🟡 Mid-range
Full Kitchen
Island or peninsula, dishwasher, full appliance suite, premium cabinets. Higher-end finish.
🔴 Higher scope
Bathroom count & type
Full Bathrooms
1
Half Baths / Powder Rooms
0
Bedroom count
Studio
Open plan — no separate bedroom.
1 Bedroom
Separate bedroom with closet.
2 Bedrooms
Two separate bedrooms — larger ADU scope.
3 Bedrooms
Three bedrooms — typically SB9 unit size.
Laundry
✓ No Laundry
Shared laundry with main home or laundromat.
💚 No added scope
Washer / Dryer Hookups
Rough-in only — client supplies appliances.
💚 Minor addition
In-Unit Stackable
Full in-unit washer/dryer — dedicated plumbing and electrical.
🟡 Moderate addition
Step 5 · Utilities & Features
Utilities and special features.
How the ADU connects to utilities and any additional features that affect scope and cost.
Utility connection
Shared with Main Home
Share existing electrical panel, water meter, and gas line. Lower upfront cost — requires proper load calculation.
💚 Lower utility connection cost
Separate Sub-Panel / Meters
Separate electrical sub-panel. May include separate water and gas meters if unit will be independently rented. Required for separate billing.
🔴 Higher — separate utility setup
HVAC
Mini-Split System
Dedicated ductless mini-split — most common for ADUs. Efficient, independent control, no duct work needed.
🟡 Standard for ADUs
Central HVAC Extension
Extend existing home HVAC system into the ADU. Only viable for attached ADUs.
🟡 Moderate — depends on existing system
Special features
Select all that apply
Solar Ready
Conduit and panel space for future solar installation. Required for new ADUs over 500 sq ft in California.
💚 Minor — rough-in only
EV Charger (240V outlet)
Dedicated 240V outlet for electric vehicle charging.
🟡 Moderate — dedicated circuit
Accessibility Features
Wider doorways, roll-in shower, grab bars — for aging-in-place or ADA considerations.
🟡 Moderate addition
Private Patio / Deck
Small outdoor patio or deck for the ADU — concrete, pavers, or wood decking.
🟡 Depends on size and material
Security Camera Wiring
Pre-wire for security cameras and doorbell.
💚 Minor addition
High Ceilings (9ft+)
Taller ceilings add cost to framing and drywall but dramatically improve the feel of a small space.
🟡 Moderate framing addition
Timeline
🔥 ASAP
Ready to start within 1–2 months.
📅 1–3 Months
Planning ahead, ready soon.
🗓️ 3–6 Months
Still in research phase.
⏰ Flexible
Exploring options, no rush.
Final · Your Estimate
Your ADU Project Estimate
Built from your selections using current Los Angeles construction rates. Includes design, permits, and full construction.
Total Project Estimate — Design, Permits & Construction
Calculating…
Based on your selections and current LA construction rates.
Note: This estimate is based on your selections and current LA market rates. Final pricing is confirmed after a free on-site consultation and design review. We provide a detailed written contract before any work begins — no surprises.
Get Your Detailed Quote
Fill in your details below and your estimate will be sent directly to our team. We’ll reach out within 24 hours to schedule your free consultation.