Design. Plan. Build.
ADU Construction Contractor
Greenville, SC
Greenville's Top ADU Construction Contractor in The Upstate, SC
Accessory Dwelling Units (ADUs) are a smart, practical way to add living space, generate rental income, or accommodate multigenerational families, all without moving. Whether you want a home office, guest suite, rental unit, or private retreat, a custom ADU expands your property’s functionality and value. These units, often referred to as "in-law suites" or "carriage houses" or "laneway suites" can be either attached to the primary residence or built as detached structures.
With Greenville County’s rapidly growing population and increasing housing demand, ADUs are an effective solution for homeowners seeking flexibility and long-term investment. At Nunley Custom Homes, we bring over 34 years of experience designing and constructing ADUs that blend seamlessly with your existing home, while maximizing comfort, aesthetics, and efficiency.
Call us at (864) 380-0724 to schedule your free consultation today.
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Why Greenville Homeowners Build ADUs?
ADUs solve common space and lifestyle challenges:
- Additional Living Space: To create extra bedrooms, home offices, or guest quarters without sacrificing existing living areas.
- Rental Income Potential: Many Greenville homeowners earn supplemental income from ADU rentals, helping offset mortgage costs.
- Flexible Lifestyle Options: ADUs can serve as private spaces for aging parents, adult children, or even your personal retreat.
- Long-Term Property Value: Homes with secondary units often see increased appraisal value and buyer appeal in Greenville’s competitive market.
- With Greenville County home values increasing steadily, a well-designed ADU is an investment that pays off both immediately through use and long-term through property value appreciation.
Types of ADUs
Every property and homeowner has unique needs, so our Greenville ADU specialists design units that fit your goals, lifestyle, and budget while enhancing your property’s value. Choosing the right type ensures your ADU is both functional and visually appealing.
Detached ADUs
Detached ADUs are stand-alone units built separately from your primary home, offering full privacy-perfect for rental income, in-law suites, or private retreats. They maximize backyard space while maintaining the main home’s footprint, which is valuable on smaller lots. Greenville County data shows detached ADUs are increasingly popular for rental purposes.
Attached ADUs
Attached ADUs connect directly to your main residence while maintaining a separate living space. Ideal for families who want proximity without sacrificing privacy, these units integrate seamlessly with the home’s architectural style, making them feel like a natural extension.
Garage Conversions / Above Garage ADUs
Underused garage space can be transformed into livable units, or a new ADU can be built above the garage. These spaces work well for bedrooms, home offices, or studio apartments. Above-garage ADUs preserve yard space while offering high-demand rental or guest accommodations, often yielding 50–65% ROI for Greenville homeowners.
Basement & Attic ADUs
When outward expansion isn’t feasible, basement or attic ADUs convert underutilized areas into functional living spaces. Proper planning for light, insulation, and egress is needed, but these units offer a cost-effective way to expand living space without altering the home’s exterior footprint.
ADU Construction Styles
Choosing the right construction method affects cost, timeline, and customization options. Here’s how we approach each style:
Modular ADUs
Prefabricated units built off-site and delivered to your property. These offer faster construction timelines , predictable costs, and minimal disruption to your daily routine. Studies show modular ADUs can reduce on-site labor by up to 30% compared to traditional builds.
Stick-Built ADUs
Traditional on-site construction that allows for full customization . Stick-built ADUs integrate seamlessly with your home’s existing architecture and materials, making them ideal for unique layouts or high-end finishes.
Tiny Home Style ADUs
Compact, efficient units that maximize limited space with multi-functional furniture, built-in storage, and open layouts . Perfect for small lots or homeowners seeking minimalistic, cost-efficient designs.
Luxury ADUs
High-end units with custom cabinetry, upscale finishes, spa-style bathrooms, and premium flooring . Luxury ADUs are often designed as full-featured apartments or private retreats, offering both style and comfort for families or tenants.
Sustainability-Focused ADUs
Environmentally conscious designs featuring solar panels, green roofs, energy-efficient insulation, and passive solar orientation . These ADUs reduce utility costs, minimize environmental impact, and can qualify for tax incentives or rebates in South Carolina.
At Nunley Custom Homes, we combine over 34 years of construction expertise with modern design trends to deliver ADUs that are functional, beautiful, and compliant with Greenville County regulations. Whether you’re looking for a detached rental unit, a cozy attic conversion, or a luxury eco-friendly ADU, we create spaces that fit your vision and enhance your property value.
Our ADU Construction Process
Adding an ADU can seem complex, but we simplify the process for Greenville homeowners:
step 1 :
Consultation & Design
We begin by understanding your goals, budget, and lifestyle needs. Our design team creates a tailored plan that integrates seamlessly with your property.
STEP 2 :
Permits & Compliance
Greenville County regulations can be tricky. We handle:
- Zoning regulations, setback requirements, lot coverage, and height restrictions
- HOA approvals and neighborhood covenant considerations
- Inspection scheduling for plumbing, electrical, and structural compliance
step 3 :
Construction & Craftsmanship
Our skilled team manages every detail:
- Framing, roofing, and finishes
- Plumbing, HVAC, and electrical integration
- Energy-efficient insulation and optional smart home features
step 4:
Final Walkthough & Handover
We walk through the ADU with you, addressing every detail to ensure full satisfaction.
Key Considerations Before Deciding on a Home Addition
When planning a home addition in Greenville or Upstate SC, here are important factors to keep in mind:
- Building Codes & Zoning: Greenville County requires permits for most structural changes.
Nunley handles the compliance process for you. - Structural Impact: Additions often require foundation, roofline, and load-bearing wall adjustments.
- Utilities: Plumbing, HVAC, and electrical upgrades may be needed.
- Timeline: Smaller projects can take 2–3 months; larger additions may take 6+ months.
- Budgeting: Beyond construction, factor in design, permits, and finishes.
We anticipate these challenges early, helping you plan and budget effectively.
Cost of ADU Construction in Greenville
The cost to build an Accessory Dwelling Unit (ADU) in Greenville, SC, typically ranges from $150 to $400 per square foot, depending on the type of unit, materials used, and complexity of the design. Attached ADUs are generally more affordable, while detached units or above-garage conversions can be on the higher end due to structural requirements and additional utilities.
Typical ADU Costs in Greenville:
- Attic ADUs: $50,000–$100,000 – Complete attic conversions with living space, electrical, plumbing, and HVAC integration.
- Above Garage ADUs: $75,000–$150,000 – Transform unused space above your garage into functional living units.
- Detached ADUs: $100,000–$250,000 – Fully new construction standalone units offering maximum privacy and flexibility.
Factors That Influence ADU Costs:
- Size & Layout: Larger units or complex floor plans require more materials and labor.
- Structural Work: Foundations, framing, roof tie-ins, or garage reinforcements can add to the cost.
- Finishes & Materials: Choices in flooring, cabinetry, lighting, and trim affect the overall budget.
- Utilities & Systems: Plumbing, HVAC, and electrical integration for comfort and compliance increase costs.
- Permits & Fees: Greenville County inspections, zoning approvals, and building permits are mandatory and factored into the budget.
At Nunley Custom Homes , we provide transparent, itemized estimates so homeowners know exactly what to expect. From design and materials to utilities and permits, we ensure your ADU project stays on budget while delivering a functional, high-quality living space.
Permits, Codes & Zoning Requirements in Greenville County
Successfully building an ADU in Greenville County requires careful attention to local regulations. At Nunley Custom Homes, we manage the permitting process from start to finish, ensuring your project is fully compliant and stress-free.
Zoning & Setbacks
All ADUs must follow Greenville County zoning rules, including height limits, lot coverage, and property line setbacks. These regulations ensure that new units do not overshadow neighboring properties or disrupt the neighborhood’s character. Data from the Greenville County Planning Department shows that strict adherence to these rules significantly reduces construction delays and costly redesigns.
ADUs cannot exceed 50% of the primary dwelling’s floor area. For example, a 2,500 sq. ft. home allows for a maximum 1,250 sq. ft. ADU. This limitation keeps the unit secondary in scale while providing sufficient living space for guests, extended family, or rental purposes.
HOA Approvals
Many Greenville neighborhoods have Homeowners Association (HOA) covenants or design guidelines. We assist homeowners in navigating these requirements, ensuring your ADU aligns with neighborhood aesthetics and avoids potential disputes. Studies show that projects approved by HOAs on the first submission reduce delays by up to 30%.
Inspections & Compliance
ADUs require plumbing, electrical, and structural inspections to meet South Carolina building codes. Compliance guarantees safety, energy efficiency, and long-term durability. Our team coordinates with inspectors and ensures all documentation is submitted correctly, preventing fines and construction setbacks.
Why Choose Nunley Custom Homes
for ADUs in Greenville?
- Local Expertise: Deep understanding of Greenville zoning, codes, and home styles.
- 34+ Years of Experience: Proven craftsmanship and expertise in home additions.
- Custom Designs: Each ADU is tailored for your lifestyle and property.
- Start-to-Finish Service: From concept to final walkthrough.
- Transparent Pricing: Detailed estimates with no hidden fees.
- Proven Reputation: Portfolio and testimonials reflect successful projects across Upstate SC.
- Warranty & Support: Ongoing maintenance guidance post-completion.
Call us today at (864) 380-0724 or request a consultation online to start planning your ADU.
Common Challenges in Building ADU & Our Solutions
Building an ADU can present unique challenges, but our 34 years of experience in Greenville ensures each project is handled efficiently and with minimal stress. From tight lots to complex design integration, we anticipate hurdles before they arise and provide practical, cost-effective solutions.
- Foundation & Grading: We engineer solutions for slopes and tight lots.
- Design Integration: Matching materials, roofing, and siding keeps your ADU cohesive with the main house.
- Minimal Disruption: We schedule construction to limit noise and interference with your daily routine.
- Small Lot Solutions: Smart layouts and vertical designs maximize available space efficiently.
With careful planning and expert execution, your ADU will feel like a natural extension of your property while avoiding common construction pitfalls.
Maintenance & Long-Term Considerations for ADU
At Nunley Custom Homes, we design and build ADUs with durability and longevity in mind. Proper maintenance and thoughtful material choices help ensure your unit remains functional, comfortable, and visually appealing for years to come.
- Weather-Resistant Finishes: High-quality siding, roofing, and windows withstand Greenville’s seasonal weather variations.
- Warranty Coverage: Post-construction support provides peace of mind and ensures lasting quality.
- Climate Considerations: Correct insulation, HVAC sizing, and moisture management protect your ADU from seasonal temperature swings and humidity.
- Regular Maintenance: Routine inspections of plumbing, electrical, and structural systems help prevent costly repairs and extend the unit’s life.
By combining expert construction with proactive care, your ADU will remain a valuable, functional, and attractive addition to your property for decades.
FAQs About ADUs in Greenville, SC
Q: What is an ADU?
A: An Accessory Dwelling Unit (ADU) is a secondary residential unit on a property with an existing single-family home. ADUs can be detached structures, attached extensions, or conversions of underutilized spaces like attics, garages, or basements, providing extra living space, guest accommodations, or rental income opportunities.
Q: Is my property eligible for an ADU?
A: To build an ADU in Greenville, your property must be zoned for single-family residential use, and either the primary residence or the ADU must be occupied by the homeowner. We help assess eligibility and guide homeowners through local zoning and building requirements.
Q: What is the best size for an ADU?
A: Greenville County regulations limit ADUs to a maximum of 50% of the primary dwelling’s floor area. For example, a 2,000 sq. ft. home could have an ADU up to 1,000 sq. ft., ensuring the unit remains secondary while maximizing functional living space.
Q: Do I need a permit for ADU building?
A: Yes, all ADU projects require permits, inspections, and compliance with HOA or neighborhood covenants. Nunley Custom Homes manages the full permitting process, including structural, plumbing, and electrical approvals, to ensure a smooth, code-compliant construction.
Q: Can I rent my ADU in Greenville, SC?
A: This depends on your exact location and zone in Greenville County. Most of Greeneville does NOT allow you to rent out an ADU so please check your zone and local regulations before planning to build an ADU for this purpose.
Q: How much does an ADU cost in Greenville, SC?
A: The cost of an ADU varies based on size, design, and finishes. On average, construction ranges from $150 to $400 per square foot, with attic or garage conversions on the lower end, and detached, luxury, or high-end ADUs reaching the higher end of the spectrum.
Q: How much does an 800 square foot ADU cost?
A: An 800 sq. ft. ADU in Greenville typically costs between $120,000 and $320,000, depending on construction type, materials, and utility integration. Costs are influenced by customization, energy efficiency upgrades, and site-specific factors like grading or lot constraints.
Q: Are ADUs legal in South Carolina?
A: Yes. ADUs are legal in South Carolina and permissible in various zoning districts, including AGC, AGC-I, RUD, RUD-I, RSF-40, RSF-30, RMX-20, RMX-10, RMX-6, and MU. Local regulations dictate size, setbacks, and occupancy requirements to maintain neighborhood standards.
Q: In which zoning districts are ADUs allowed?
A: ADUs are allowed in several Greenville County and South Carolina zoning districts, including AGC, RUD, RSF, RMX, and MU designations. Each district may have specific height, lot coverage, or occupancy rules, which we navigate to ensure your ADU is fully compliant.
Ready to Build Your ADU in Greenville?
Turn your property vision into reality with a custom ADU designed for comfort, flexibility, and long-term value. Nunley Custom Homes guides you through every step, design, permits, construction, and final walkthrough.
Call (864) 380-0724 today to schedule your free consultation and start planning your ADU.
Contact Us
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