About Us Learn who we are, how we build, and why homeowners trust us with their ADU projects. ADU Process A step-by-step overview of how IMKAT takes your ADU from concept… to permits… to construction. Events / Open Houses Visit our build sites, tour completed ADUs, and meet the team in person. Careers Explore opportunities to grow your career with IMKAT.

ADU Retirement Units Comfortable backyard homes for aging loved ones. ADU for Investors Maximize rental income with high-ROI ADUs. ADU Financing Flexible financing options to fit your budget. Detached ADUs Private standalone backyard homes for any use. Tiny Home Builder Custom tiny homes built for smart, efficient living.

Pre-Construction Get expert design, engineering, and permit management — all handled by one coordinated team. ADU Design Custom floor plans, layouts, and elevations created to match your property and lifestyle. ADU Engineering Structural, Title-24, and code-accurate plan sets that ensure safety and faster approvals. ADU Permitting Complete permit management — submissions, revisions, resubmittals, and final approval handled for you.

1 Bedroom ADU Models Compact, efficient layouts perfect for guests or small rentals. 2 Bedroom ADU Models Maximize rental income with high-ROI ADUs. 3 Bedroom ADU Models Spacious models ideal for multi-gen living or high-value rentals. Duplex ADU Models Two independent units under one roof… perfect for investors or maximizing rental income. Customize Your ADU Fully personalize layouts, finishes, and features to match your vision. NEW Retirement ADU Models Senior-friendly plans focused on accessibility, comfort, and peace of mind.

Interior Design Packages Curated design packages to help you style your ADU interior with modern finishes, cohesive themes, and optimized layouts. Blogs Insights, guides, and tips to help you plan, build, and optimize your ADU project. FAQ Quick answers to the most common ADU questions — permitting, costs, timelines, requirements, and more.

adu builders in your city

Custom ADU builders in
Vallejo, California

We design and build high-quality ADUs in San Jose with a streamlined, end-to-end process that covers plans, permits, engineering, and construction.

adu builders in your city

Custom ADU builders in
Vallejo, California

why homeowners choose us

Trusted ADU builders for San Jose homeowners

We build ADUs that fit San Jose properties, follow local regulations, and deliver long-term value. Our team manages everything in-house – design, engineering, permits, and construction – so your project moves forward smoothly without surprises.

Local ADU Zoning Expertise

We design ADUs that follow San Jose zoning rules, setback requirements, and permit standards to ensure fast approval.

Full ADU Design and Construction

Complete ADU services - architectural plans, engineering, permits, and full build - all managed by our in-house San Jose team.

Fast and Predictable ADU Timelines

Efficient planning, clear scheduling, and consistent project management to keep your San Jose ADU construction on track.

From San Jose Backyard ADUs to full custom builds, add more living space without the cost or stress of moving.

Years of Combined Building Experience

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ADUs Designed
& Built

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Years of Combined Building Experience

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ADUs Designed
& Built

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ADU MODELS

Popular ADU models for San Jose homeowners

Explore our most requested ADU designs built for San Jose lots, rental goals, and family living needs. Every model includes full architectural plans, engineering, and construction – all completed by our licensed San Jose ADU team.

All Products
01 Bedroom
02 Bedroom
03 Bedroom
Duplex

Cost Calculator

Estimate your ADU cost in Vallejo

Use our quick ADU calculator to get an estimated build cost based on your preferred size, layout, and finishes. Designed for Vallejo homeowners, this tool gives you a fast, realistic price range before scheduling a consultation.

Choose ADU Size

300

County

Estimate Cost

Monthly

$993

Total

$141,827

We Build the Ultimate ADUs

why build an ADU in San Jose

Smart reasons to build an ADU on Your San Jose property

From increasing your home’s value to creating rental income, ADUs offer San Jose homeowners a practical and high-return way to expand living space. With rising housing demand and flexible zoning rules, building an ADU today brings long-term benefits for your family and your investment.

Earn Up to $2,500–$3,500/Month

San Jose rental demand is high, and ADUs easily generate $2,500+ per month in long-term rental income sometimes more in high-demand neighborhoods.

Add 400–1,200 sq. ft. of
Living Space

Create new space for family, guests, or work-from-home setups without needing to buy a larger home.

Flexible, Future-Proof Living

An ADU adapts as your needs change — from hosting aging parents to creating a private space for adult children or long-term guests.

The Perfect
Retirement Plan

Thousands of San Jose retirees are downsizing into accessible, low-maintenance ADUs while renting out their main homes for income.

Increase Property Value

Boost your home’s value by 25%–35% with a quality-built ADU.

Save $300k+ Compared to Buying a Bigger Home

A new ADU costs far less than upgrading to a larger property in San Jose — making it one of the smartest financial decisions for homeowners.

Simplify the Entire Process

IMKAT handles design, permits, and construction start to finish.

Save $300k+ Compared to Buying a Bigger Home

A new ADU costs far less than upgrading to a larger property in San Jose — making it one of the smartest financial decisions for homeowners.

Lower Monthly Cost Than Major Renovations

Most ADUs qualify for financing with low monthly payments — often cheaper than large-scale home remodels.

types of ADUs we build

ADU options that fit San Jose homes

We build a variety of ADU types designed to match San Jose property layouts, zoning rules, and long-term living needs. Whether you’re expanding space for family or creating a rental unit, we offer solutions that fit your lot and your goals.

Attached ADUs

Expand your home with a connected custom ADU addition that blends perfectly with your main house.

Detached ADUs

Standalone backyard ADUs offering privacy, flexibility, and full living comfort ideal for rentals or family.

Garage Conversions

Turn your existing garage into a turnkey livable ADU perfect for guests, tenants, or a home office.

ADU walkthrough

Step inside a beautifully built San Jose ADU

Take a guided look at the finishes, layout, and design details we deliver in every San Jose ADU project.

San Jose ADU regulations

San Jose ADU regulations made simple

Building an ADU in San Jose comes with specific rules for size, setbacks, parking, and utilities. Our team helps you navigate all requirements so your ADU is approved quickly and built correctly. Here are some of the key regulations you should know:

Maximum ADU Size

San Jose allows detached ADUs up to 1,200 sq. ft., depending on lot size and zoning. Junior ADUs (JADUs) are limited to 500 sq. ft. inside the primary home.

Setback Rules

Most detached ADUs require a 4-foot rear and side setback. Front setbacks vary by zoning district.

Parking Requirements

No additional parking is required if your home is within ½ mile of public transit. Garage conversions do not require replacement parking.

Utility Connections

Detached ADUs need separate water, sewer, and electrical hookups. Attached ADUs may share existing utility systems.

Height Limits

Detached ADUs in San Jose can be up to 16 feet tall. Taller structures may be allowed with additional review.

ADU Zoning

ADUs are allowed in most San Jose residential zones, including R-1 and R-2. We confirm lot eligibility, setbacks, and easements before starting your project.

Our Projects

Over 150 ADUs Built for Families Like Yours

From Sacramento to the Bay Area — every IMKAT project reflects craftsmanship, trust, and long-term value.

Spanish ADU

Sacramento CA

684

1 Bedroom

1 Bathroom

Spanish ADU

Penryn CA

1198

2 Bedroom

2 Bathrooms

Davis ADU

Davis CA

750

1 Bedroom

1 Bathroom

749 SQFT ADU

Pleasant Hill CA

749

2 Bedroom

2 Bathrooms

462 SQFT ADU

Citrus Heights

462

1 Bedroom

1 Bathroom

Pool House ADU

Vacaville

289

1 Bathroom

How It Works

A simple, predictable ADU process for San Jose homeowners

We’ve created a step-by-step ADU process that keeps everything clear, organized, and hassle-free. From initial design to final inspection, our San Jose team manages the entire project so you always know what’s happening next.

Plan Strategically

We evaluate your San Jose lot, utility access, and goals to create a clear project roadmap.

Design & Permitting

Complete architectural plans, engineering, and permit approvals handled in-house.

Construction

Quality craftsmanship from licensed builders with consistent communication and updates.

Rent & Earn

Your ADU is delivered ready-to-use — for living, guests, or rental income.

Construction

Quality craftsmanship from licensed builders with consistent communication and updates.

Rent & Earn

Your ADU is delivered ready-to-use — for living, guests, or rental income.

why choose IMKAT

Why build with IMKAT Homes?

See how IMKAT compares to general contractors and other ADU builders in San Jose. Our specialized process, transparent pricing, and proven experience set us apart.

Features

Specializing in ADUs

ADU Built in Just 8 Months

Financing Options Available

3 Months of Free Assisted Living for Retirees

Over 200 ADUs Built

General Contractors

Other ADU Contractors

Create a comfortable, modern ADU that adds space, value, and rental income to your San Jose home.

Your San Jose ADU starts with the right estimate

Trusted ADU specialists serving San Jose

End-to-end project management

High-quality materials and craftsmanship

Engineering, permitting, and design included

Trusted ADU specialists serving San Jose

End-to-end project management

High-quality materials and craftsmanship

Engineering, permitting, and design included

financing options

Flexible ADU financing options for San Jose homeowners

Building an ADU is a smart investment, and we make it easier with financing plans designed for San Jose property owners. Whether you’re looking to build rental income, create space for family, or increase home value, we help you choose the most affordable option.

Home Equity Loans (HELoan):Get funds upfront with a fixed interest rate and predictable payments.
HELOC: Borrow as needed, ideal for phased pool house construction.
Cash-Out Refinance: Use your home’s increased value to pay for your new ADU project.
Fast Approval Process: Quick pre-qualification and same-week approvals through trusted lenders.

Testimonials

Homeowners Love Building With IMKAT.

With hundreds of successful ADU projects completed, we’re proud to be one of the most trusted ADU builders across California. See what real homeowners have to say about working with our team.

Let’s Build Your Dream ADU Together

From the first sketch to the final tile, IMKAT Homes delivers custom ADUs built to your lifestyle, your property, and your timeline.

Let’s Build Your Dream ADY Together

From the first sketch to the final tile, IMKAT Homes delivers custom ADUs built to your lifestyle, your property, and your timeline.

Frequently Asked
Questions About ADUs

Everything you need to know about building, pricing, and designing your backyard ADU with IMKAT. Whether you’re just starting or ready to build these answers cover it all.

Didn’t find your answer?

What are the benefits of building an ADU?

ADUs offer several advantages:

Affordable Housing: They provide an affordable housing option without the need for purchasing additional land or major new infrastructure.
Additional Income: Homeowners can generate rental income by leasing the ADU.
Family Flexibility: ADUs allow extended families to live close together while maintaining privacy.
Efficient Use of Space: They make use of underutilized spaces, enhancing property value and utility.

Do ADUs require separate utility connections?

ADUs can share utilities with the main home or have separate meters. Some cities require separate sewer and water connections. Our ADU consultants will assess your electrical panel to determine if it can support your ADU or if an upgrade is needed.

How much does it cost to build an ADU in California?

Our costs range from $125,000 to $300,000+, depending on size, location, and materials. Garage conversions are typically the cheapest, while detached ADUs are the most expensive.

View some of our models and consult with our ADU specialists for pricing.

Our pricing does not include utilities and permits as they vary by property.

What permits are required for an ADU in California?

Permits are required for construction, zoning, and utilities. The permit process takes 3-5 months and varies by city. California law requires cities to approve or deny ADU applications within 60 days.

Can I rent out my ADU?

Yes! ADUs can be rented long-term (30+ days). Short-term rentals (Airbnb) may be restricted based on city rules.

What are California’s size limits for ADUs?

Detached ADUs: Up to 1,200 sq. ft.
Attached ADUs: Up to 50% of the primary home’s size (or 800 sq. ft., whichever is larger).
JADUs: Max 500 sq. ft.

Detached ADUs: Up to 1,200 sq. ft.
Attached ADUs: Up to 50% of the primary home’s size (or 800 sq. ft., whichever is larger).
JADUs: Max 500 sq. ft.

Be aware that ADU size limits may vary by county and are subject to local zoning regulations. For exact requirements, consult your county officials or speak with one of our representatives for more information.

Can I sell an ADU separately from my home?

Generally, no—ADUs are part of the main property. However, California’s SB 9 law allows lot splits in certain cases, which may enable separate ADU ownership.

For more details, check with your local planning department or contractor.

How do ADUs impact property taxes?

In California, adding an ADU increases property taxes only on the new unit, not the main home. The tax hike is typically 1–1.5% of the ADU’s assessed value. For a $200K ADU, expect an annual increase of $2K–$3K. Prop 13 caps future annual increases at 2%. Consult your county assessor for exact details.

Do you provide financing?

Yes! We partner with RenoFi to offer financing options for your ADU project.

Learn More Here

About Us

ADU Process

Events / Open Houses

Careers

ADU Retirement Units

ADU for Investors

ADU Financing

Detached ADUs

Pool House ADUs

Tiny Home Builder

1 Bedroom ADU Models

2 Bedroom ADU Models

3 Bedroom ADU Models

Duplex ADU Models

Customize Your ADU

Retirement ADU Models

ADU Design

ADU Engineering

ADU Permitting

Interior Design Packages

Blogs

FAQ

Custom ADU builders in Vallejo, California

Custom ADU builders in Vallejo, California

why homeowners choose us

Trusted ADU builders for San Jose homeowners

Local ADU Zoning Expertise

Full ADU Design and Construction

Fast and Predictable ADU Timelines

From San Jose Backyard ADUs to full custom builds, add more living space without the cost or stress of moving.

ADU MODELS

Popular ADU models for San Jose homeowners

Estimate your ADU cost in Vallejo

Smart reasons to build an ADU on Your San Jose property

Earn Up to $2,500–$3,500/Month

Add 400–1,200 sq. ft. of Living Space

Flexible, Future-Proof Living

The Perfect Retirement Plan

Increase Property Value

Save $300k+ Compared to Buying a Bigger Home

Simplify the Entire Process

Save $300k+ Compared to Buying a Bigger Home

Lower Monthly Cost Than Major Renovations

ADU options that fit San Jose homes

Attached ADUs

Detached ADUs

Garage Conversions

Step inside a beautifully built San Jose ADU

San Jose ADU regulations made simple

Maximum ADU Size

Setback Rules

Parking Requirements

Utility Connections

Height Limits

ADU Zoning

Over 150 ADUs Built for Families Like Yours

Spanish ADU

Spanish ADU

Davis ADU

749 SQFT ADU

462 SQFT ADU

Pool House ADU

A simple, predictable ADU process for San Jose homeowners

Plan Strategically

Design & Permitting

Construction

Rent & Earn

Construction

Rent & Earn

Why build with IMKAT Homes?

Features

Specializing in ADUs

ADU Built in Just 8 Months

Financing Options Available

3 Months of Free Assisted Living for Retirees

Over 200 ADUs Built

General Contractors

Other ADU Contractors

Create a comfortable, modern ADU that adds space, value, and rental income to your San Jose home.

Flexible ADU financing options for San Jose homeowners

Custom ADU builders in
Vallejo, California

Custom ADU builders in
Vallejo, California

Add 400–1,200 sq. ft. of
Living Space

The Perfect
Retirement Plan

Frequently Asked
Questions About ADUs