From detached backyard cottages and garage conversions to in-law suites and attached additions, our team manages every phase of the process with quality craftsmanship, transparent communication, and attention to detail.
At JOSCON, we understand that every property is different. Our experience in residential construction and remodeling allows us to design and build ADUs that blend seamlessly with your existing home while maximizing comfort, efficiency, and long-term value.
Contact JOSCON today for professional and quality service from start to finish.
JOSCON provides complete ADU design-build services throughout Southern New Hampshire and Massachusetts. Whether your vision is modern, traditional, compact, or fully customized, we create spaces that are both practical and beautifully finished.
Standalone structures are designed to provide privacy and independence while complementing your existing property.
Transform underutilized garage space into a comfortable and fully functional living area.
Create safe, convenient living accommodations for extended family members while maintaining privacy and connection.
Provide a welcoming and comfortable space for visiting friends and family with custom guest accommodations.
Build an income-producing property addition with efficient layouts and professionally managed construction.
Design a dedicated workspace, studio, or multifunctional living area separated from your primary residence.
We discuss your goals, property layout, budget, and long-term plans to determine the best ADU solution for your home.
Our team develops detailed plans focused on functionality, aesthetics, and compliance with local regulations.
We help guide you through zoning requirements, permitting, and construction approvals to keep your project moving smoothly.
JOSCON coordinates every phase of the build with skilled craftsmanship, organized project management, and clear communication throughout the process.
We complete a thorough review to ensure every detail meets our quality standards and your expectations.
At JOSCON, we believe an ADU should feel like a natural extension of your property. Our team combines construction expertise, practical design solutions, and professional project management to create spaces that are functional, attractive, and built to last.
Whether you are planning a detached backyard cottage, converting an existing structure, or adding an in-law suite to your home, JOSCON delivers the experience and attention to detail needed to bring your vision to life.
If you’re dealing with inspection-related repairs, we’re here to help make the process easier. From initial review to final fixes, we’ll guide you every step of the way.
An Accessory Dwelling Unit (ADU) is a secondary residential living space located on the same property as a primary home. ADUs may be detached, attached, converted from existing space, or built as additions.
In many areas, yes. Local zoning regulations vary, so we help homeowners understand local requirements and permitted uses before construction begins.
Project timelines depend on the size, complexity, permitting process, and site conditions. Most ADU projects typically range from several months from planning through final completion.
Absolutely. Garage conversions are one of the most efficient ways to create additional living space while maximizing your current property footprint.
Costs vary based on size, finishes, utilities, site preparation, and overall project scope. We provide transparent proposals tailored to your project goals and budget.
In many cases, yes. Professionally designed and constructed ADUs can increase both property functionality and long-term resale value.
Building and Remodeling has always been a passion for Jonathan O’Sullivan, the founder and President of JOSCON Management, Inc.
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