Charleston is mostly a Spectrum and AT&T market. Spectrum Business has the dominant cable footprint across the metro. AT&T Business Fiber covers a growing share of commercial blocks downtown. Home Telecom serves parts of the Lowcountry suburbs with fiber. T-Mobile fixed wireless is widely available.
The pricing problem in Charleston is the assumption that the local fiber co-ops are not worth quoting. Home Telecom often comes in 20 to 30 percent below the incumbent on fiber to the building in the suburbs.
How Charleston's market is shaped
Charleston's commercial activity sits in three places. The Central Business District holds the legal, financial, and government corridor downtown. The King Street Commercial Corridor runs through dense small-business and mid-size office tenancy on the peninsula. Avondale, on the West Ashley side, is the suburban office and retail spine outside the urban core. The Medical University of South Carolina and Boeing South Carolina are two of the largest commercial accounts in the metro and shape what enterprise pricing looks like for the rest of the market.
In February 2025, IQ Fiber announced a 10 gig-capable fiber deployment in the Charleston metro, with first phases targeting West Ashley and Mount Pleasant. That puts a real fiber overbuilder against Spectrum and AT&T in this market for the first time in years. One pricing wrinkle: properties inside the King Street Business Improvement District pay a special fee on top of normal property taxes under South Carolina's Municipal Improvements Act, which can show up indirectly in commercial lease pass-throughs.
What you should be paying
These are dedicated internet ranges from current carrier wholesale data, marked up to typical retail.
Charleston dedicated internet, typical retail (mid 50%)
Monthly recurring charge, dedicated internet access (DIA). Numbers are derived from current carrier wholesale quotes. Shown as a metro-tier band where city-level data is thin.
| Speed | Typical retail (mid 50%) | Sample size |
|---|---|---|
| 100 Mbps | $630 – $1,060/mo | n = 6 |
| 500 Mbps | $955 – $1,660/mo | n = 6 |
| 1 Gbps | $1,195 – $2,000/mo | n = 7 |
| 10 Gbps | $1,560 – $6,250/mo | n = 6 |
If your bill sits above the high end of the band, you are likely overpaying.
Analyze My Bill FreeFor AT&T Business Fiber at 1 Gbps, expect $150 to $230 a month for a single office. For Spectrum coax at 600 Mbps, the fair price is $150 to $230 a month.
Carriers worth quoting in Charleston
Five carriers cover most addresses in the metro.
- Spectrum Business. Coax everywhere, fiber in select buildings.
- AT&T Business Fiber. Strong commercial fiber footprint downtown.
- Home Telecom. Fiber across parts of the Lowcountry suburbs.
- T-Mobile Business Internet. $85 a month for 200 to 300 Mbps. Useful benchmark.
- Verizon 5G Business Internet. $99 a month at 400 Mbps.
If you have not had three of these on a quote sheet, you have not run a real comparison.
What to do this week
- Pull your most recent invoice. Find the contract end date and the side fees.
- Get one quote outside Spectrum. T-Mobile Business Internet is the fastest benchmark.
- Compare your base rate to the bands above. If you are 20 percent above the high end, the retention call is worth making.
See where your Charleston bill sits against current rates
Upload your latest business internet invoice. We will run it against Charleston carrier wholesale data and flag the side fees that should not be there.
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