How to Design & Build Your Accessory Dwelling Unit (ADU) in Charleston, SC

Creating an Accessory Dwelling Unit (ADU) in Charleston not only increases living space but can also generate rental income, boost your property’s value, and support affordable housing goals. Here’s a step-by-step plan, featuring Charleston’s zoning requirements and Canter Construction’s trusted design-build process.

1. Understand City Zoning & Requirements

Charleston permits ADUs across all base zoning districts. ADUs must be 850 square feet or less, house up to two adults, and cannot be used as a short-term rental. You need at least one additional onsite parking space, and the lot must be free of covenants blocking ADU construction.

2. Explore Financing & Grant Programs

The City of Charleston offers limited grant funds for ADU design and construction assistance. Full construction typically costs between $100,000 and $300,000. Financing options include FHA renovation loans, home equity lines, and ADU-specific construction loans.

3. Choose Your ADU Type

Consider a detached ADU (backyard cottage), an attached unit, or a garage conversion/basement ADU. Garage conversions can be cost-effective and preserve the neighborhood’s aesthetic. Consider style alignment with neighborhood architecture to preserve Charleston’s character.

4. Collaborate with Canter Construction’s Design-Build Team

Canter Construction offers end-to-end ADU solutions: design, permitting, construction, and finishes. Their team emphasizes clear communication, high-quality craftsmanship, and full client collaboration. Clients praise their meticulous approach, professionalism, and timely delivery—evidenced in glowing reviews.

5. Obtain Permits & Declarations of Covenant

Submit ADU plans—including floor layout, utility hookups, parking, and covenant documentation—for city approval. A Declaration of Covenants & Restrictions must be filed before construction completion. Canter Construction handles permit preparation and submission for a seamless process.

6. Build with Quality & Transparency

Once permits are secured, Canter’s expert crews bring your ADU to life using premium materials and smart design detailing. Expect staggered milestones: foundation, framing, electrical/plumbing, and finishes. Regular site communication ensures you’re updated throughout.

7. Complete Final Inspections & Connect Utilities

The city inspects for building, fire, plumbing, electrical, and occupancy standards. Your ADU can have separate meters or shared utilities, depending on your preference and design plan.

8. Rent, Host Family, or Live-In

Once the certificate of occupancy is granted, you may choose to:

  • Rent long-term (subject to parking and occupancy rules)

  • Accommodate family/guests

  • Downsize into the ADU and rent out the main house.

Remember: no short-term rentals under 29 days are permitted in Charleston ADUs.

Why Choose Canter for Your ADU in Charleston, SC?

  • Local Expertise: Deep knowledge of Charleston’s zoning, design, and permit workflows.

  • Design-Build Efficiency: One cohesive team oversees every project phase.

  • Premium Local Craftsmanship: Trusted reputation for high-end execution and attention to detail.

  • Client-Focused: Transparent budgeting, consistent updates, and hands-on collaboration.

  • Proven Results: Numerous satisfied clients, with consistently high ratings.

Final Words

Building an ADU in Charleston, SC is a strategic investment—enhancing property value, enabling rental revenue, and enriching your lifestyle. With Canter Construction’s design-build approach, you get a trusted local partner to guide you from initial idea to final inspection. Ready to explore options tailored to your lot? Contact Canter Construction to begin your ADU journey today.