5 Star Rating

Accessory Dwelling Units (ADUs) in Connecticut

A smarter way to add living space—without moving.

START MY PROJECT

Custom built home with outdoor design and view.

FEELING STUCK?

Feeling stuck by rising home prices?

Casali Companies designs and builds high-quality Accessory Dwelling Units (ADUs) across Connecticut—helping homeowners create flexible living space for family, guests, or rental income, without the cost and stress of buying a new home.

We guide you through zoning, permitting, and construction with clarity and confidence—so you can make smart, long-term decisions for your property.

An ADU allows you to expand your home’s potential while staying exactly where you are—adding independence, privacy, and flexibility on your existing property.

Request a Consultation

An ADU is a great fit if you are:

Planning for aging parents

Need space for adult children

Hosting guests comfortably

Looking for long-term rental income

We intentionally limit the number of ADUs we build each year so every project receives the attention it deserves.

Learn more about ADUs →

WHAT IS AN ADU?

What Is an Accessory Dwelling Unit (ADU)?

An Accessory Dwelling Unit (ADU) is a fully self-contained living space located on the same property as a primary home. It includes its own kitchen, bathroom, living area, and private entrance—designed to function as an independent residence.

ADUs are commonly used for family members, guests, or long-term rental income, while preserving privacy for both the main home and the ADU.

Detached backyard cottage

Garage or basement conversion

Attached ADU addition

WHY

Why Connecticut Homeowners Are Choosing ADUs

Insights, Ideas & Expert Guidance for Your Next Home Project

Why Connecticut Homeowners Are Choosing ADUs

Insights, Ideas & Expert Guidance for Your Next Home Project

With home prices rising and limited inventory across Connecticut, many homeowners are looking for smarter ways to create space—without leaving the communities they love. Accessory Dwelling Units (ADUs) offer a flexible, long-term solution that adapts to changing family needs while maximizing the value of an existing property.

Icon representing landscaping and garden service features.

Rising Home Prices

Add living space without buying a new home or competing in today’s market.

Rising Home Prices

Add living space without buying a new home or competing in today’s market.

Multigenerational Living

Create privacy and independence for parents, adult children, or long-term guests.

Multigenerational Living

Create privacy and independence for parents, adult children, or long-term guests.

Future-Proofing

Plan ahead for aging in place, lifestyle changes, or future downsizing options.

Future-Proofing

Plan ahead for aging in place, lifestyle changes, or future downsizing options.

Stay Local

Remain in the neighborhood you love while adapting your home to your needs.

Stay Local

Remain in the neighborhood you love while adapting your home to your needs.

Rental Income

Create long-term income potential with a fully permitted ADU—whether as a long-term rental, guest suite, or future flexibility for changing needs.

Rental Income

Create long-term income potential with a fully permitted ADU—whether as a long-term rental, guest suite, or future flexibility for changing needs.

COMPARISON

Moving vs ADU

Moving

Higher home prices

Competing in today’s market often means paying a premium for less space.

Higher home prices

Competing in today’s market often means paying a premium for less space.

Higher interest rates

New mortgages can significantly increase monthly costs and long-term expenses.

Higher interest rates

New mortgages can significantly increase monthly costs and long-term expenses.

Closing costs

Agent fees, taxes, and moving expenses add up quickly.

Closing costs

Agent fees, taxes, and moving expenses add up quickly.

Leaving your community

Relocating often means giving up the neighborhood, schools, and routines you value.

Leaving your community

Relocating often means giving up the neighborhood, schools, and routines you value.

Building an ADU

Independent living space

Create a private, self-contained unit without disrupting your main home.

Independent living space

Create a private, self-contained unit without disrupting your main home.

Long-term flexibility

Adapt the space over time—for family, guests, or future needs.

Long-term flexibility

Adapt the space over time—for family, guests, or future needs.

Lower total investment

Expand your living options without purchasing an entirely new property.

Lower total investment

Expand your living options without purchasing an entirely new property.

No relocation stress

Stay put and improve the property you already own and love.

No relocation stress

Stay put and improve the property you already own and love.

Start My Project

Our ADU Design-Build Process

Feasibility & Zoning Review

Confirm what’s allowed on your property

Design & Planning

Create a functional, code-compliant layout

Permits & Approvals

Coordinate submissions and town approvals

Construction & Finishes

Build and complete your ADU

COST EXPECTATIONS

What Does an ADU Cost in Connecticut?

$150,000 – $350,000+

View our ADU Cost Guide

Most Connecticut ADU projects fall within this range, but every property is different. We provide clear cost guidance early in the process so there are no surprises later.

COST EXPECTATIONS

What Does an ADU Cost in Connecticut?

$150,000 – $350,000+

View our ADU Cost Guide

Most Connecticut ADU projects fall within this range, but every property is different. We provide clear cost guidance early in the process so there are no surprises later.

COST EXPECTATIONS

What Does an ADU Cost in Connecticut?

$150,000 – $350,000+

View our ADU Cost Guide

Most Connecticut ADU projects fall within this range, but every property is different. We provide clear cost guidance early in the process so there are no surprises later.

COST EXPECTATIONS

What Does an ADU Cost in Connecticut?

$150,000 – $350,000+

View our ADU Cost Guide

Most Connecticut ADU projects fall within this range, but every property is different. We provide clear cost guidance early in the process so there are no surprises later.

ZONING & APPROVALS

Navigating ADU Zoning in Connecticut

Local zoning review

Town approvals

Parking & septic considerations

Historic & coastal requirements

Accessory Dwelling Unit regulations vary widely from town to town across Connecticut. Zoning requirements, lot size, parking, septic capacity, and historic or coastal overlays can all affect what’s allowed on your property.

Our team handles the research, coordination, and approvals process—working directly with local zoning officials to ensure your ADU complies with all applicable regulations before design and construction begin.

See our Town-by-Town ADU Zoning Guide

See our ADU Zoning Guide

FAQ

Common Questions

Do all towns allow ADUs?

Can I rent out my ADU?

Do ADUs increase property value?

How long does an ADU take to build?

WHY CHOOSE US

Why Work With Casali Companies?

Family-owned since 1973, we bring generations of craftsmanship to every custom home, addition, and renovation.

CT-based builder

Deeply rooted in Connecticut, with decades of experience building in local towns, neighborhoods, and conditions.

Our track record →

CT-based builder

Deeply rooted in Connecticut, with decades of experience building in local towns, neighborhoods, and conditions.

Our track record →

Local zoning experience

We understand Connecticut’s zoning requirements and navigate approvals before construction begins.

Our process →

Local zoning experience

We understand Connecticut’s zoning requirements and navigate approvals before construction begins.

Our process →

Custom, not pre-fab

Every ADU is thoughtfully designed for your property, your needs, and long-term use—never a one-size-fits-all solution.

Our projects →

Custom, not pre-fab

Every ADU is thoughtfully designed for your property, your needs, and long-term use—never a one-size-fits-all solution.

Our projects →

Clear communication

You’ll always know what’s happening, what’s next, and where your project stands—from planning through completion.

Our testimonials →

Clear communication

You’ll always know what’s happening, what’s next, and where your project stands—from planning through completion.

Our testimonials →

Quality craftsmanship

We focus on durable construction, refined details, and finishes that feel integrated with your existing home.

Our quality →

Quality craftsmanship

We focus on durable construction, refined details, and finishes that feel integrated with your existing home.

Our quality →

53+ Years Building

Family-owned since 1973, with generations of hands-on experience in custom homes, additions, and renovations.

More about us →

53+ Years Building

Family-owned since 1973, with generations of hands-on experience in custom homes, additions, and renovations.

More about us →

GET IN TOUCH

Let’s Discuss
Your Project

Considering an ADU for Your Property?

If you’re planning an accessory dwelling unit (ADU) and are looking for a builder who values quality, clarity, and craftsmanship, we’d be happy to talk.