Impact Glass or Shutters: What a Replacement Slider Needs in Horry County's Coastal Zone

September 4, 2026

If you replace a sliding glass door on or near the oceanfront in Horry County, the door has to be protected from wind-borne debris: either impact-rated glass tested to ASTM E1886 and E1996, or a non-impact door with an approved covering such as shutters or wood panels. An impact-rated two-panel door runs $3,000 to $6,000 installed; a standard door runs $1,500 to $4,000 plus the cost of protection. This post explains where the rule comes from, who it applies to, and how to decide, and it starts with the most important point: repairs do not trigger it. Rollers, locks, and even new glass in an existing panel are maintenance. Only a full replacement opens the question.

Where the rule comes from

South Carolina adopts the International Codes with state modifications through the Building Codes Council, and the current set, the 2021 South Carolina Building Codes, took effect January 1, 2023. For houses, townhomes, and most low-rise condos the governing document is the 2021 South Carolina Residential Code, the state’s version of the IRC. Georgetown County, for example, enforces the 2021 IRC with South Carolina modifications for one- and two-family dwellings and the 2021 IBC for everything else, and Horry County’s permit rules reference the same 2021 editions.

Section R301.2.1.2 of the residential code, Protection of Openings, says that exterior glazing in buildings located in wind-borne debris regions shall be protected from wind-borne debris, and that the protection shall meet the requirements of the Large Missile Test of ASTM E1886 and ASTM E1996. There is an exception: wood structural panels at least 7/16 inch thick, spanning no more than 8 feet, fastened according to the code’s table, are permitted as protection for one- and two-story buildings.

The code defines a wind-borne debris region as the area within one mile of the coastal mean high water line where the ultimate design wind speed is 130 mph or greater, or any area where the design wind speed is 140 mph or greater. It defines hurricane-prone regions more broadly as the Atlantic and Gulf coasts where the design speed exceeds 115 mph.

Does it apply to my address?

Design wind speeds along the South Carolina coast run roughly 130 to 150 mph, with Horry County at about 140 to 150 and Georgetown County at about 130 to 150. Put that against the one-mile line and the answer for most of the Strand’s door stock is clear: oceanfront and near-ocean addresses in North Myrtle Beach, Myrtle Beach, Surfside Beach, Garden City, Murrells Inlet, and Litchfield are in the wind-borne debris region.

Inland it depends on the map. Carolina Forest, the Socastee and Forestbrook neighborhoods, Little River’s waterway side, and Conway are a mile or more from the beach, and whether a given address hits the 140 mph threshold on the code’s wind speed figure is a question for the building department. We check before quoting a replacement, because finding out at plan review is expensive.

Two other things decide whether the rule touches you at all:

• Repair versus replacement. The protection-of-openings rule applies to glazing in the building’s openings. Replacing rollers, a track, a lock, or the insulated glass unit inside an existing panel does not create a new opening or a new door, and it is maintenance. A full replacement, where the frame comes out and a new unit is set in the rough opening, is where the code and the permit come in.
• Permits. Horry County requires a permit for work that constructs, enlarges, alters, or repairs a structure, and its list of exempt work (fences under 7 feet, small sheds, finish work, and so on) does not include doors or windows. Inside the City of Myrtle Beach and the other municipalities, the city’s own building office issues permits. Georgetown County’s building department at 129 Screven Street handles Murrells Inlet and the Georgetown side of Garden City.

Why the rule exists here

The Grand Strand has earned it. Hurricane Hugo made landfall as a Category 4 just after midnight on September 22, 1989, and the National Weather Service recorded a 13-foot storm surge at Garden City and Surfside Beach, up to 90 percent of Garden City’s homes destroyed, and 10 inches of sand on Surfside’s Ocean Boulevard. Hurricane Matthew came ashore at McClellanville on October 8, 2016 as a Category 1 with 85 mph winds and pushed the Waccamaw at Conway to a then-record 17.9 feet. Florence in September 2018 broke that record at 22.1 feet and put 8 feet of water in a Socastee neighborhood. Ian made its South Carolina landfall near Georgetown on September 30, 2022 with 80 mph winds and set a record 10.77-foot tide at the Springmaid Pier gauge. Hurricane season runs June 1 to November 30 with a statistical peak on September 10, and the Strand sits in the path.

What breaks a building in a hurricane is often not the wind itself but a breached opening. Once a door or window fails, wind pressurizes the interior and lifts the roof. Sliding glass doors are the largest glazed openings in most coastal homes and condos, and they face the water. The debris rule is about keeping them intact.

Option one: an impact-rated door

An impact-rated sliding door uses laminated glass, two panes bonded to a plastic interlayer that holds the glass together when it is struck, in a frame reinforced and fastened to hold the panel in the opening under pressure. The whole assembly is tested to the large missile standard.

Cost: $3,000 to $6,000 installed for a two-panel 6 to 8 foot unit; three- and four-panel doors more.

Advantages: protection is always on. Nobody has to put panels up before a storm, which on a fifth-floor balcony or for an owner who lives out of state is not a small thing. Laminated glass also cuts outside noise noticeably and blocks most UV, and it is harder to break into. Insurers commonly recognize impact openings; ask yours what documentation they want.

Disadvantages: cost, and weight. Impact panels are heavier, so the rollers, track, and installation all have to be right. A door fastened short of the manufacturer’s schedule is not impact-rated no matter what the label says.

Option two: a standard door plus protection

A non-impact door at $1,500 to $4,000, with code-compliant protection over the opening: roll-down or accordion shutters, storm panels, or, under the code’s exception for one- and two-story buildings, 7/16-inch wood structural panels spanning no more than 8 feet, fastened per the table.

Cost: the door plus shutters or panels. Depending on the system, the total lands near or above an impact door on a large opening, and below it on a small one.

Advantages: the door itself is cheaper and lighter, and a shutter protects the whole opening, frame included.

Disadvantages: someone has to deploy it, in time, every time. Plywood on a balcony is a plan that works on paper. Accordion and roll-down shutters solve that but add their own cost and maintenance, and salt gets into their tracks too.

Our recommendation, honestly

For an oceanfront condo balcony or any door above the first floor, an impact-rated door is the sensible answer. For a ground-floor house with an owner on site and an existing shutter system, a standard door behind the shutters is fine and cheaper. For a rental unit, impact glass, because the guest in residence on September 10 is not going to put up panels.

And before any of this: make sure the door actually needs replacing. A frame that is corroded through, racked out of square by a storm, or a discontinued model with no parts is a replacement. A door that drags, will not lock, or has fogged glass is a repair at a fraction of the cost, with no code question attached. A fogged panel in a sound oceanfront door can even get an impact-rated glass unit at $700 to $1,500 per panel, which buys most of the protection without a new frame.

What to ask an installer

• Is my address in the wind-borne debris region, and how do you know?
• Which product approval will you submit with the permit, and does it cover my opening size?
• What is the manufacturer’s fastening schedule, and will I see the sill pan and flashing before trim goes on?
• If shutters instead: are they rated to the standard, and who deploys them?

Prices for every option are on the pricing page, the process is on the replacement page, and the FAQ covers permits county by county.