Accessory Dwelling Units (ADUs)

Custom-built ADUs starting at $125K+ or approximately $200 per square foot

Whether you are building for rental income, a home office, or multigenerational living, ADUs provide flexible, high-value living space on your property.

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ACCESSORY DWELLING UNIT

What is an ADU?

An Accessory Dwelling Unit (ADU) is a smaller, independent residential unit located on the same lot as a single-family home.

Also Known As:

Granny Flats
In-Law Suites
Backyard Cottages

To Qualify, the Unit Must Include:

Living

Sleeping

Cooking (kitchen with stove, sink, refrigerator)

Bathroom

Types of ADUs

🏡

Detached
(standalone structure)

🏠

Attached
(connected to main home)

🔨

Conversion
(garage, attic, basement)

📐

Junior ADU
(under 500 sq ft within main home)

ADU Floor Plans

Compact Studios

UNDER 500 SQ FT

Huckleberry

~583 SQ FT

Open-concept layout
Floor-to-ceiling windows
Kitchen island
Private bedroom nook

Backyard Oasis

~400 SQ FT

Affordable design
Airbnb-style use
Full bathroom
Compact footprint

Kestrel & Tanager

~160 SQ FT

Ultra-minimalist
SIP shell kits
Custom interior
Office or pool house use

One-Bedroom ADUs

500–800 SQ FT

Modern Slanted Roof Plan

~935 SQ FT

Vaulted ceilings
Covered porch
Can function as 2-bed or office
Standalone home feel

Meadowlark

~336 SQ FT

Privacy-focused
Separate sleeping/living areas
Efficient layout

L-Shape Layout

~749 SQ FT

Wraparound design
Creates private outdoor space
Strong indoor-outdoor flow

Large / Multi-Story ADUs

Carriage House / Osprey

~1,391 SQ FT

Two-story unit
Built over garage
Suitable for full family or premium rental

Stacked 1BR/1BA

~950 SQ FT FOOTPRINT

Vertical build
Ideal for tight lots
Maximizes limited space

DESIGN FEATURES / DIFFERENTIATORS

Vaulted ceilings increase perceived space
“Storage wall” concept keeps layouts open
Indoor-outdoor flow using patios and glass doors
SIP panels improve efficiency and speed construction

Removing Load-Bearing Walls: Myth-Busting the Open Concept Dream

COST SECTION

Base Pricing:

Starting at $125,000+ ~$250 per square foot

Typical Ranges:

Garage conversions: $80,000–$150,000 Detached builds: $200,000–$400,000+

Additional Cost Factors:

Utilities and hookups Soil conditions (expansive clay may require reinforced foundation) Finish level Site prep

TIMELINE

Total Duration

6-8 months

Planning & Feasibility

~30 days

Design & Engineering

~30 days

Permitting

1–3 weeks

Construction

4–6 months

Final Inspection

~3 days

Variations

Garage: 1–3 months
Detached: 4–6 months
SUP (Special Use Permits) extend 90 days

Common Delays

Utility hookups
HOA approvals
Soil conditions

ROI & VALUE

Property Value Increase:

Typically 20%–35% increase

Example:

Build cost: $200,000
Added value: $250,000
Equity gain: 25%

Rental ROI Example:

Rent: $2,000/month
Annual: $24,000
Expenses: ~$4,000
Net: $20,000
ROI: ~8%

Payback Period:

Garage conversions: 5–8 years
Detached builds: 10–15 years

Additional ROI Drivers:

Energy efficiency (SIPs reduce costs)

Frequently Asked Questions

GENERAL

What is an ADU?

→ A secondary residential unit on the same property.

What types of ADUs exist?

→ Detached, attached, conversion, and junior ADUs.

COST & VALUE

How much does it cost?

→ $80K–$400K+ depending on type.

Does it add property value?

→ Yes, typically 20%–35%.

ZONING & REGULATIONS

Can I build an ADU?

→ Depends on zoning, setbacks, and lot coverage.

What are setbacks?

→ Required distance from property lines.

What is lot coverage?

→ Max % of property that can be built on.

TIMELINE & PROCESS

How long does it take?

→ 6–18 months.

What causes delays?

→ Utilities, HOA approvals, soil conditions.

CONSTRUCTION & DESIGN

What is a SIP panel?

→ High-efficiency building panel that speeds construction.

Do I need a separate utility meter?

→ Not always. Sub-metering is optional.

RENTAL

Can I rent the ADU?

→ Usually yes, depending on local rules.

Does it require a full kitchen?

→ Yes.

GARAGE / ADDITION QUESTIONS

How much does a garage addition cost?

→ $150–$350 per sq ft.

Does a garage add value?

→ 60%–80% ROI.

TECHNICAL DETAILS

Do I need special foundation work?

→ Sometimes, especially in clay-heavy soil.

Are there height restrictions?

→ Typically 15–25 ft depending on area.

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