5-Star Reviews • Fully Licensed & Insured
Serving residential and commercial customers throughout South Carolina, especially in Charleston County and parts of Berkeley County, including Mount Pleasant, Daniel Island, Isle of Palms, Kiawah Island, Seabrook Island, Charleston, North Charleston, Summerville, Goose Creek, and surrounding Lowcountry areas.
Fortrex Charleston operates as a specialized window replacement contractor, delivering residential window replacement services as a full building envelope performance upgrade, not simply removing and installing new windows.
Over time, window systems lose their ability to control:
Air → Water → Heat
This leads to:
Window replacement restores full system control across all three.
Window systems degrade gradually due to:
Performance breakdown:
Air movement is driven by pressure differences between interior and exterior environments.
Air pressure behavior:
Result:
Proper window replacement prevents:
Window systems are designed to manage water, not eliminate it completely.
Controlled water flow:
Critical components:
Failure scenario:
Proper window replacement restores the drainage path, ensuring water exits the system instead of being trapped within the wall assembly.
Heat transfer occurs through both the glass and the frame.
Thermal behavior:
What is thermal bridging:
Consequences:
Proper replacement reduces:
Condensation forms when air reaches its dew point temperature.
How it works:
What causes condensation in windows:
Consequences:
Proper replacement prevents:
The most common failure point is the connection between the window and the wall.
Common issues:
Proper replacement ensures:
Window replacement must align with the full exterior system.
Proper integration:
Failure scenario:
Window replacement is required when the existing system cannot maintain performance or efficiency.
Key distinctions:
When replacement is necessary:
Escalation pattern:
ROI of window replacement:
Our process ensures full system restoration:
| Incorrect Replacement | Correct Replacement |
|---|---|
| No flashing allows water intrusion | Flashing redirects water |
| Air leaks remain | Airtight sealing prevents infiltration |
| Thermal bridging increases energy loss | Proper insulation improves efficiency |
| Poor alignment causes gaps | Precise alignment ensures performance |
| No integration with siding | Full envelope integration |
| Scope / Complexity | Price Range |
|---|---|
| Standard window replacement | $400 – $1,000 per window |
| Energy-efficient systems | $1,000 – $2,000 per window |
| High-end custom windows | $2,000 – $4,000+ per window |
| Service | Objective | When It Works |
|---|---|---|
| Window Repair | Fix localized issues | When system is intact |
| Window Replacement | Restore full performance | When system has failed |
| Window Installation | Install new system | New construction |
Fortrex Charleston operates as a system-focused window replacement contractor.
We operate where replacement quality defines long-term performance.
See what our customers say about our window replacement service.
Window replacement restores full control.
Removing old windows and installing new, sealed systems.
Heat transfer through structural elements instead of insulation.
The temperature at which moisture condenses into water.
$400–$4,000+ per window.
Yes, significantly.
Age, seal breakdown, and poor installation.
Yes, with proper insulation and sealing.
Yes, for proper drainage.
A few hours per window.
20–30 years.
Look for expertise in sealing, drainage, and energy performance.
We provide Window Replacement Contractor Services across South Carolina, based near Mount Pleasant.
At Fortrex Charleston, our service lineup is built around the exterior systems property owners depend on most. As a general contractor, we focus on the improvements that directly affect structure, weather protection, appearance, energy performance, and long-term maintenance. Each service below is designed to solve real problems, answer real search intent, and help people make informed decisions.
