Accessory Dwelling Units (ADUs) are one of the most effective ways to add livable space, long-term value, and flexibility to your home. At Cascella & Sons Construction Corp, we specialize in designing and building high-quality ADUs that blend seamlessly with your existing property while meeting all local zoning and building requirements. Whether you’re planning an in-law suite, rental unit, guest house, or private home office, our team delivers ADU solutions built for comfort, durability, and lasting value.
Add space. Add style. Add value
Your home should evolve with the way you live—not limit it. A well-planned home addition creates space where you need it most while enhancing comfort, functionality, and long-term value. At Cascella & Sons Construction Corp, we design and build additions that feel like they were always part of your home, not an afterthought.
Whether you’re envisioning a private primary suite, an expanded kitchen for entertaining, or additional living space for a growing family or aging loved ones, our team turns ideas into thoughtfully crafted living environments. Every addition we build is designed to improve daily life today while strengthening your home’s value for the future.
We begin by understanding how you use your home and where it falls short. What feels cramped or inefficient? Where could better flow, light, or functionality make a difference? What would truly improve the way your family lives day to day?
From there, we design and construct a custom home addition that solves real problems while enhancing the overall balance and appearance of your home. Because an addition isn’t just about adding square footage—it’s about making your home work better in every way.
Unlike the traditional back-and-forth between architects and contractors, Cascella & Sons manages both design and construction under one roof. This streamlined approach results in clearer communication, tighter timelines, and a project that stays on budget and on schedule. With one experienced team guiding the process from concept through completion, you gain confidence, clarity, and a smoother path to a home that truly fits your life.
Detached ADUs are standalone structures built separately from the main home, offering maximum privacy and flexibility. These units are ideal for backyard guest houses, rental units, or long-term family living. Designed to blend seamlessly with your property, detached ADUs provide full living accommodations while preserving independence and comfort.
Create a private retreat designed around comfort and relaxation. Primary suite additions typically include a spacious bedroom, spa-like bathroom, and walk-in closets, offering separation from secondary bedrooms and flexibility for both first- and second-floor layouts.
In-law suite ADUs are designed to support multigenerational living while maintaining privacy and independence. These units typically include a bedroom, bathroom, kitchenette, and private entrance, creating a comfortable living solution for aging parents or family members who want to stay close—without sacrificing autonomy.
Different Long Island home styles require different ADU strategies. Cascella & Sons Construction Corp designs and builds Accessory Dwelling Units that respect your home’s original architecture while improving livability, privacy, and long-term value. Each ADU is carefully planned to feel like a natural extension of your home—not an afterthought.
Cape-style homes often need creative solutions to overcome low ceilings and limited second-floor space. We design second-story additions, dormer expansions, and rear additions that preserve classic charm while dramatically improving headroom, bedroom size, and overall livability.
Cape-style homes often benefit from creative ADU solutions that address low ceiling heights and compact layouts. We design garage conversions, dormer-supported ADUs, and rear or attached ADUs that preserve the classic Cape appearance while maximizing usable living space. These designs improve comfort, headroom, and functionality without compromising charm.
Colonial homes are well-suited for symmetrical attached ADUs and thoughtfully designed rear additions. Our ADU designs maintain architectural balance while adding fully independent living space. Whether used for multigenerational living or rental income, Colonial-style ADUs blend naturally with the home’s structure and scale.
A well-designed Accessory Dwelling Unit does more than add usable living space—it significantly strengthens your home’s market appeal, flexibility, and long-term value. As housing needs evolve across Long Island, ADUs have become one of the most strategic investments homeowners can make.
Thoughtful planning, quality materials, and professional construction all play a role in creating an ADU that feels intentional rather than forced. Buyers and appraisers respond positively to ADUs that integrate seamlessly with the main home, offering independent living space without compromising aesthetics or functionality. Whether used for rental income, multigenerational living, or future flexibility, a properly built ADU enhances both immediate usability and resale potential.
Cape-Style Homes
Cape-style homes were originally designed with expansion in mind, making them well-suited for attached ADUs, dormer-supported layouts, and garage or rear conversions. When designed correctly, ADUs on Cape homes improve headroom, functionality, and overall livability while preserving classic charm—often resulting in strong returns through increased usability and buyer appeal.
Ranch-Style Homes
Ranch homes benefit greatly from single-level ADUs that maintain accessibility while efficiently increasing square footage. Attached ADUs, garage conversions, and rear additions work particularly well with ranch layouts, offering independent living space without disrupting flow. These designs appeal strongly to buyers seeking flexibility, aging-in-place options, or rental potential.
Colonial-Style Homes
Colonial homes lend themselves to symmetrical, well-integrated ADUs that maintain architectural balance. Rear or side ADUs designed to mirror the existing structure can significantly increase living space while preserving curb appeal. For many buyers, a Colonial home with a thoughtfully designed ADU offers both classic design and modern functionality—an increasingly valuable combination.
Thoughtfully designed and expertly built home additions and renovations—managed seamlessly from concept to completion.
In Long Island’s competitive real estate market, moving often means leaving the neighborhood you love, paying a premium for a home that still needs work, or compromising on space and layout. A thoughtfully designed Accessory Dwelling Unit allows you to gain flexible living space, rental potential, or multigenerational accommodations—without giving up your location, community, or long-term financial stability.
An ADU gives you options: space for family, income opportunities, or future flexibility, all while staying rooted where you belong.
ADUs are often more cost-effective than purchasing a larger home
Generate potential rental income to offset mortgage or living expenses
Avoid closing costs, realtor fees, and moving-related expenses
Maintain your existing mortgage and interest rate
Increase overall property value and market appeal
Build equity through added livable, permitted square footage
Stay in your current school district and community
Keep family routines, neighbors, and daily conveniences intact
Create space for aging parents, adult children, or guests
Avoid bidding wars in a tight Long Island housing market
Customize the ADU to your exact needs—rental, in-law, or personal use
Gain flexibility for the future without uprooting your life
Building an Accessory Dwelling Unit requires more than adding square footage—it demands careful planning, zoning knowledge, architectural integration, and precise construction. At Cascella & Sons Construction Corp, we bring every aspect of the ADU process together under one experienced team, giving homeowners a clear, streamlined path from concept to completion.
From feasibility and design through permitting and construction, you work with a single, coordinated partner focused on delivering an ADU that feels intentional, compliant, and built to last. The result is clearer communication, fewer delays, and a smoother experience—without the confusion that comes from managing multiple firms.
When ADU design and construction are handled together, the entire process becomes more efficient and predictable. Our integrated approach provides:
Property and zoning feasibility review to confirm ADU eligibility
Architectural design tailored to your home’s style and local requirements
Full permit preparation and municipal approval management
Guidance through ADU-specific building codes and regulations
Material and layout planning focused on livability and long-term value
Dedicated project management with experienced construction oversight
Seamless coordination between designers, builders, and trades
One contract, one point of contact, and one team accountable for results
Some homeowners prefer a hands-off experience. Others want clear timelines, organized documentation, and full visibility into every phase of their project. At Cascella & Sons, we’re built for both—but we excel with clients who value structure, planning, and honest communication.
If you appreciate a well-defined process, clear expectations, and knowing exactly where your project stands at all times, you’ll feel confident working with our team.
Every decision, timeline, and budget item is clearly outlined and accessible, so there are no surprises along the way.
Regular updates keep you informed on progress, upcoming milestones, and next steps—before questions ever arise.
From permits and approvals through final walkthrough, every phase is planned and managed to ensure nothing is overlooked.
Skilled craftsmanship backed by thorough planning, inspections, and attention to detail—because quality should never be assumed.
We handle the complexity so you can follow along as much or as little as you want.
Hear from Long Island Homeowners Who Transformed Their Living Space with Us
Every ADU project begins with careful planning, documentation, and scheduling. We define scope, layouts, materials, zoning requirements, timelines, and logistics upfront so construction starts with clarity—not guesswork.
Your ADU is managed by experienced professionals who coordinate trades, manage schedules, and maintain quality standards throughout every phase of construction.
We provide clear, consistent communication with regular updates on progress, inspections, and next steps, so you always know where your project stands.
Each phase of construction is carefully inspected—from site preparation through final finishes—to ensure your ADU meets our standards and integrates seamlessly with your existing home and property.
Our organized approach keeps work moving efficiently, minimizes disruptions to your household, and ensures your ADU is completed on time and on budget.
We handle the complexity behind the scenes so you can move forward with confidence.
About Cascella & Sons Contractors
An ADU (Accessory Dwelling Unit) is a secondary residential living space built on the same property as a primary home. It functions as a complete, independent living unit and typically includes a kitchen, bathroom, sleeping area, and private entrance. ADUs are often used as in-law suites, guest houses, rental apartments, or home offices.
There are several types of accessory dwelling units:
Attached ADU – an addition connected to the existing house
Detached ADU – a separate small structure in the backyard
Garage Conversion – converting an existing garage into living space
Basement Apartment – finishing a basement into a legal apartment
Above-Garage Apartment – living space built over a garage
We evaluate your property to determine which option is permitted and most cost-effective.
Many towns now allow ADUs due to housing demand, but zoning requirements vary by municipality. Regulations typically involve lot size, setbacks, parking, and owner-occupancy requirements. We review local zoning codes and handle the approval process before construction begins.
Yes. ADUs require architectural plans, zoning approval, and building permits. Inspections are also required during construction. Our team prepares drawings, submits applications, and coordinates approvals to ensure the unit is legal and safe.
In many municipalities, yes — ADUs can be legally rented as long as they meet local housing and building codes. Some areas require owner occupancy or restrict short-term rentals. We help design the ADU to comply with local regulations so it can be used as a legal rental unit.
Costs vary depending on size, utilities, and whether the unit is attached or detached. Conversions such as basements or garages are typically less expensive than building a new structure. We provide a detailed estimate after evaluating the property, utilities, and structural requirements.
Yes. A legal ADU can significantly increase resale value and marketability because it provides additional usable square footage and income potential. Buyers often see ADUs as a flexible living solution for extended family or rental income.
Not always. ADUs can share utilities with the main house or have separate meters depending on local requirements and homeowner preference. We design plumbing, electrical, and HVAC systems appropriately for efficiency and code compliance.
