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 — and an Accessory Dwelling Unit (ADU) is one of the smartest ways to do it. Whether you’re creating space for family, generating rental income, or increasing your property value, a well-designed ADU gives you flexibility without sacrificing your existing home.
At Cascella & Sons Construction Corp, we design and build custom ADUs across Long Island that feel fully integrated, functional, and built for long-term value. From detached backyard cottages to garage and basement conversions, every ADU is tailored to your property, your goals, and local zoning requirements.
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.
Ranch-style homes offer the perfect foundation for seamless expansions and accessory dwelling units. With their single-story layout and wide footprint, we design rear extensions, side additions, and detached or attached ADUs that maximize square footage without disrupting the home’s natural flow. Ranch-style ADUs are ideal for multigenerational living, guest suites, or rental income, providing easy accessibility, open layouts, and modern functionality while maintaining the home’s original character.
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.
Thoughtfully designed and expertly built accessory dwelling units — from concept to completion, fully managed for a seamless experience.
An ADU is a smart way to increase your home’s value while adding flexible, functional space. Whether for family, rental income, or future use, it offers both immediate benefits and long-term potential.
At Cascella & Sons, we design and build ADUs that blend seamlessly with your home—delivering lasting value, efficiency, and versatility.
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.
