CallataGuidesBusiness phone system for engineering services firms in Charleston, SC
Engineering services firms in the Charleston-North Charleston, SC metro area: 228 establishments in 2023, the local area codes, and what phone service costs an 18-person team.
- Establishments
- 228CBP 2023
- Employees
- 4,152mid-March 2023
- Per 100k residents
- 26.2U.S. 18.6
- Rank
- 53rd of 735areas by count
How many engineering services firms are in Charleston, SC?
County Business Patterns counts 228 engineering services firms (NAICS 541330, Engineering Services) in the Charleston-North Charleston, SC metro area for 2023. Together they reported 4,152 mid-March employees and $407.8 million of payroll for the year. That ranks 53rd of the 735 metro and micropolitan areas where Census published a count for this industry.
With 870,000 residents in the Census 2024 estimate, that is 26.2 engineering services firms per 100,000 people, 41.0% above the national rate of 18.6. Establishments average 18.2 employees, 8.7% below the U.S. average of 19.9. Payroll per employee comes to $98,228, 10.7% below the national $109,949.
| Measure | Charleston, SC | South Carolina | United States |
|---|---|---|---|
| Establishments | 228 | 946 | 63,233 |
| Mid-March employees | 4,152 | 20,383 | 1,260,577 |
| Annual payroll | $407,844,000 (moderate noise) | $2,039,680,000 (moderate noise) | $138,599,619,000 |
| Employees per establishment | 18.2 | 21.5 | 19.9 |
| Payroll per employee | $98,228 | $100,068 | $109,949 |
| Establishments per 100,000 residents | 26.2 | 17.3 | 18.6 |
Census County Business Patterns 2023 (mid-March employment; annual payroll). Employees and payroll flagged high-noise are shown but not used in the text. Residents: Census Vintage 2024 estimates.
Establishment size: engineering services firms in Charleston, SC
Of the engineering services firms in Charleston, SC that had employees in March 2023, 52.9% had fewer than five (the U.S. share is 53.1%). 69.2% had fewer than ten. For a business of a few people, phone coverage is a staffing question as much as a technology one: someone has to be free to pick up, or the call needs somewhere sensible to go.
| Employment size | Establishments | Share | U.S. share |
|---|---|---|---|
| 1–4 employees | 120 | 52.9% | 53.1% |
| 5–9 employees | 37 | 16.3% | 15.0% |
| 10–19 employees | 18 | 7.9% | 13.1% |
| 20–49 employees | 34 | 15.0% | 11.3% |
| 50 or more employees | 18 | 7.9% | 7.6% |
Employment-size classes count establishments by mid-March 2023 employment. Establishments with no March employees are excluded from the size classes, so shares are of establishments with employees. Source: Census County Business Patterns 2023.
Calls an engineering firm in Charleston, SC has to catch
Engineering firms handle client calls, contractor questions and agency coordination, often while staff are in the field. Routing calls to the right project engineer saves time on every project.
Calls an engineering firm in Charleston, SC might handle in a typical week include:
- A developer calls about a site plan.
- A homeowner calls about a structural inspection.
- A contractor calls with a field question.
Calls after closing time
Field issues sometimes need an after-hours callback; routine calls can wait until morning.
Business-hours routing in Callata sends calls to voicemail, a teammate's cell or an AI agent once the day ends, and voicemails arrive transcribed with an urgency flag.
What a phone system costs an engineering firm in Charleston, SC
The average engineering firm in Charleston, SC has 18.2 employees, so an 18-person team is a reasonable benchmark. Priced per seat, 18 users would run $540.00 a month on RingCentral RingEX Core and $449.10 on Ooma Office Pro (month-to-month list prices, checked September 28, 2026). On Callata the same 18 people cost $359.00 a month, less than either per-seat plan.
The annual difference against RingCentral's monthly list price comes to $2,172. Some vendors discount annual contracts; the table shows month-to-month prices.
| Provider (plan) | Pricing basis | Per month | Per year |
|---|---|---|---|
| Callata (Callata Office) | $99 incl. 5 users, $20 per extra user | $359.00 | $4,308.00 |
| Quo (Starter) | $19.00 per user | $342.00 | $4,104.00 |
| Nextiva (Core) | $23.00 per user | $414.00 | $4,968.00 |
| Ooma (Office Pro) | $24.95 per user | $449.10 | $5,389.20 |
| Dialpad (Standard) | $27.00 per user | $486.00 | $5,832.00 |
| RingCentral (RingEX Core) | $30.00 per user | $540.00 | $6,480.00 |
Competitor prices are each vendor's published month-to-month list price per user for its lowest plan that includes business calling and texting, checked September 28, 2026: Quo Starter $19, Nextiva Core $23, Ooma Office Pro $24.95 (Essentials excludes texting; one-time $29.95 activation not included), Dialpad Standard $27, RingCentral RingEX Core $30 ($20 billed annually). Prices exclude taxes and fees and may change; annual contracts lower some competitors' prices.
Local area codes for engineering services firms in Charleston, SC
NANPA records place the exchanges of the area's named cities and towns in 2 area codes. 843 has the most, with 267 of 330 exchanges (81%). Callata's plan includes up to 3 local numbers; you can pick them in the area codes your clients recognize, subject to carrier inventory, or port the number you already have for free.
| Area code | Exchanges | Time zone | In service since | Overlay with |
|---|---|---|---|---|
| 843 | 267 | Eastern | 1998 | 854 |
| 854 | 63 | Eastern | 2015 | 843 |
Exchanges are NANPA-assigned central office codes (NPA-NXX) in the rate centers matched to the area's named places. Source: NANPA utilized code and NPA reports.
How Callata works for engineering services firms
Callata Office costs $99 per month for up to 5 people, and each additional user is $20 a month. That covers up to 3 local numbers, calling from a browser or your cell, transcribed voicemail, recorded calls with AI summaries, after-hours routing and E911 on each number.
If you already have a number in Charleston, SC, porting it to Callata is free. Texting from a local number requires a one-time carrier registration (10DLC, $49), and the numbers available in any area code depend on carrier inventory when you choose them.
Optional AI agents (receptionist, sales, support or scheduler) can answer calls after hours or when nobody picks up, take messages, text, email and transfer to your team. They are billed from prepaid AI minutes at $0.25 per minute, identify themselves as AI, and may only place outbound calls to people who consented, between 8am and 9pm.
Frequently asked questions
How many engineering services firms are there in Charleston, SC?
Census County Business Patterns counted 228 engineering services firms in the Charleston-North Charleston, SC metro area in 2023. They employed 4,152 people in mid-March.
What does a business phone system cost for an 18-person engineering firm?
At month-to-month list prices checked September 28, 2026, 18 users cost $540.00 a month on RingCentral RingEX Core and $449.10 on Ooma Office Pro. On Callata, $99 a month with 5 users included, then $20 per additional user, the same team pays $359.00.
What area code should an engineering firm in Charleston, SC use?
Area code 843 has the most assigned exchanges among the area's named places, followed by 854. If you already have a local number, you can port it to Callata for free.
Can an AI receptionist answer calls for an engineering firm?
Yes. Callata's optional AI agents can answer when the team is busy or closed, take a message, text, email or transfer the call. They disclose that they are AI and are billed from prepaid AI minutes at $0.25 per minute.