Commercial Build-Out Guide for South Carolina Business Owners

What Is a Commercial Build-Out?

A commercial build-out — also called a tenant improvement (TI) — is the process of customizing a leased commercial space to meet the specific needs of your business. This can range from a simple office partition layout in an existing shell to a complete gut renovation with new mechanical, electrical, plumbing systems, and specialized equipment installations. The scope depends on the condition of the existing space (shell condition, second-generation, or turnkey) and the requirements of your business type.

A shell condition or "vanilla box" space has concrete floors, bare stud walls, basic HVAC, and electrical panel — everything else must be built. A second-generation space has been previously occupied and may have usable walls, ceilings, restrooms, and utilities that reduce build-out costs by 20-40%. A turnkey space is move-in ready for the same type of business — a previous restaurant space converted for a new restaurant, for example.

Build-Out Costs by Business Type

Office space is the most affordable build-out at $50 to $80 per square foot for a standard layout with private offices, conference rooms, break room, and reception area. Open-concept layouts with glass partition walls run $70 to $100/sqft. Premium executive offices with custom millwork and high-end finishes reach $100 to $150/sqft. A 2,000-sqft office build-out in the Myrtle Beach market typically costs $100,000 to $160,000.

Retail space costs $60 to $120 per square foot depending on the level of custom fixtures, display systems, and customer experience elements. A basic retail layout with dressing rooms, checkout counter, and display walls runs $60 to $80/sqft. Specialty retail with custom fixtures, lighting design, and branded environments costs $80 to $120/sqft.

Restaurant space is the most expensive at $100 to $200+ per square foot due to commercial kitchen requirements: Type I and Type II hood systems ($15,000-$40,000), grease traps ($3,000-$8,000), commercial plumbing with floor drains and three-compartment sinks, walk-in cooler/freezer ($8,000-$20,000), fire suppression systems ($5,000-$15,000), and DHEC health department compliance. A 2,500-sqft restaurant build-out in coastal SC typically costs $250,000 to $500,000+.

Medical and dental offices cost $120 to $200+ per square foot due to specialized requirements: medical gas systems, lead-lined walls for radiology, sterilization areas, HIPAA-compliant reception/records areas, additional HVAC zones for patient comfort, and enhanced plumbing for treatment rooms. A 3,000-sqft dental practice costs $360,000 to $600,000+ for a complete build-out.

Tenant Improvement Allowances

A tenant improvement (TI) allowance is money the landlord contributes toward your build-out costs, expressed as a dollar amount per square foot. In the Myrtle Beach and Charleston commercial real estate markets, typical TI allowances in 2026 range from $15 to $60 per square foot depending on lease length, tenant credit, and market conditions.

Key negotiation points: longer lease terms (7-10 years) command higher TI allowances. National credit tenants receive more than local startups. The TI allowance can be structured as direct payment to the contractor, rent abatement, or as a construction loan built into the lease. Understand whether the TI covers only "hard costs" (construction) or also "soft costs" (design, permits, equipment). Some landlords cap TI at a fixed dollar amount per square foot; others offer a turnkey build-out where the landlord manages construction. Work with a commercial real estate attorney to structure the TI provision in your lease before signing.

ADA Compliance Requirements

All commercial spaces open to the public must comply with the Americans with Disabilities Act (ADA) Standards for Accessible Design. Key requirements include: 36-inch minimum clear width for all doors and hallways, at least one accessible restroom per floor, ramps with 8.3% maximum slope (1:12 ratio) at any level change, accessible parking spaces (one per 25 total spaces), clear floor space of 30x48 inches at all service counters and equipment, and accessible signage with Braille at permanent rooms and exits.

ADA compliance is not optional and is verified during the commercial building inspection process. Non-compliance can result in costly lawsuits — the average ADA accessibility lawsuit settlement is $15,000 to $50,000. It is significantly cheaper to design ADA compliance into the build-out from the start than to retrofit after construction. Your general contractor and architect should verify ADA compliance at every stage of the design and construction process.

Commercial Permitting in South Carolina

Commercial build-out permits in Horry County and Charleston County require more extensive plan review than residential projects. Expect 3 to 6 weeks for commercial plan review versus 2 to 4 weeks for residential. The permit package typically includes architectural drawings (floor plan, elevations, sections), structural engineering if modifying load-bearing elements, MEP plans (mechanical, electrical, plumbing), fire protection plans if the space requires a sprinkler system, and a signed and sealed energy code compliance document.

Restaurant build-outs require an additional DHEC (Department of Health and Environmental Control) plan review for the commercial kitchen — this adds 2 to 4 weeks and must be approved before the building permit is issued. Medical facilities may require additional reviews from DHEC's Division of Health Facilities Licensing. All commercial spaces require a certificate of occupancy (CO) before opening to the public — the CO is issued after the final building inspection verifies code compliance.

Timeline: From Lease to Opening

Design-Build vs. Traditional Bid Process

The design-build approach uses a single firm for both design and construction, streamlining communication and shortening the timeline by 20-30%. Design decisions are made collaboratively with real-time cost feedback, preventing the "design it, then find out it's over budget" problem. This approach works well for straightforward build-outs where speed to opening is a priority.

The traditional bid process separates design (architect) from construction (contractor). The architect creates complete drawings, then multiple contractors bid on the same plans. This can produce competitive pricing but adds 4 to 8 weeks for the bidding and selection process, and changes during construction require coordination between architect and contractor. This approach works best for complex or high-budget projects where the owner wants maximum price competition.

Common Mistakes Business Owners Make

• Signing the lease before understanding build-out costs: Get a contractor estimate before committing to a space. A $20/sqft rent that requires $150/sqft in build-out is more expensive than $25/sqft rent with a second-generation space needing $50/sqft.
• Underestimating restaurant costs: Kitchen equipment, hood systems, and DHEC requirements account for 40-60% of restaurant build-out costs. Budget these before design begins.
• Ignoring HVAC capacity: The existing HVAC system may not support your use — restaurants and medical offices generate more heat and require more ventilation than standard office or retail use.
• Skipping the test-fit: Before signing a lease, have your contractor or architect do a test-fit to verify the space layout works for your business operations, meets code requirements, and fits within budget.
• Forgetting signage permits: Exterior signage requires a separate permit and often HOA or landlord approval. Allow 2-4 weeks for signage permitting — start this process early so signage is ready when you open.