What to Look for When Buying a Home Near the Beach in South Carolina

A standard home inspection tells you about the house. On an oceanfront lot in South Carolina, the more consequential questions are about the land — specifically, where two lines drawn by the state fall across it.

Those lines decide whether you can add a room, replace a pool, repair a seawall, or rebuild at all after a storm. They are not zoning, they are not the flood map, and they are not on the listing. They also move — the state is required to redraw them periodically, and a redraw is happening right now.

This article is about the due diligence specific to buying near the water here. For the transaction generally, start with my complete guide to buying a home in Myrtle Beach.

The Two Lines That Govern an Oceanfront Lot

South Carolina's Beachfront Management Act is codified at S.C. Code Title 48, Chapter 39, and it's administered by the South Carolina Department of Environmental Services, Bureau of Coastal Management (SCDES BCM).

Per § 48-39-280(A), the department must establish a baseline paralleling the shoreline for each erosion zone. For a standard erosion zone, "the baseline for each standard erosion zone is established at the location of the crest of the primary oceanfront sand dune in that zone." Where the shoreline has been altered by erosion control devices, the baseline is set where the dune crest would have been.

Then § 48-39-280(B): a setback line is established landward of the baseline "a distance which is forty times the average annual erosion rate or not less than twenty feet from the baseline for each erosion zone."

SCDES describes the practical effect plainly on its state beachfront jurisdictional lines page: "The setback line delineates the landward extent of the state's direct permitting authority for activities proposed within the Beach/Dune System Critical Area." The agency also notes the jurisdictional area covers three beachfront critical areas — Beach/Dune System, Beaches, and Coastal Waters — and that activities involving "habitable structures, pools, renourishment, landscaping, fencing, decks, service lines, and other alterations are reviewed to determine if authorization is required."

Read that list again. Fencing. Landscaping. A pool. These are not exotic edge cases; they're the things buyers assume they'll do in year one.

What You Can and Cannot Do, by Zone

§ 48-39-290 sets the rules, and they change sharply depending on which side of the baseline you're on.

Seaward of the baseline

"No new construction or reconstruction is allowed seaward of the baseline" — with a short, specific list of exceptions:

A permit from the department is required for most of those exceptions. And under § 48-39-355, even where an activity is specifically authorized by the chapter and no permit is required, "the department may require documentation before the activity begins" showing compliance.

Between the baseline and the setback line

This is where most oceanfront houses sit, and the rules are more permissive but still hard-edged. For a new habitable structure partly seaward of the setback line, the owner must certify in writing to the department that:

• The structure is no larger than 5,000 square feet of heated space
• It is located as far landward on the property as practicable, with a drawing submitted showing footprint, cross section, and relation to property and setback lines
• No erosion control structure or device is incorporated as an integral part of it
• No part is built on the primary oceanfront sand dune or seaward of the baseline

For structures that already existed: normal maintenance and repair is allowed without notice to the department. Additions are allowed only if the addition plus the existing structure stays within that same 5,000 square feet of heated space, and the addition has to meet the new-construction conditions above.

If a beachfront buyer's plan is "buy it, then double it," that plan needs checking against this section before the offer, not after.

Beach and dune vegetation

§ 48-39-310 is short and absolute: "The destruction of beach or dune vegetation seaward of the setback line is prohibited unless there is no feasible alternative," and where destruction is permitted, replanting mitigation is required as a permit condition.

That sea oat-covered dune between the deck and the water is not landscaping you own outright. Treat it as regulated.

The Question to Ask Before You Fall in Love: What Happens If It's Destroyed?

This is the single most important thing a beachfront buyer should understand, and almost nobody asks it.

Under § 48-39-290(B)(1)(b)(iv), replacement of a habitable structure destroyed beyond repair due to natural causes is allowed after the owner notifies the department that all of the following are met:

• The total square footage of the replaced structure seaward of the setback line does not exceed the original's square footage seaward of that line, and the linear footage parallel to the coast does not exceed the original's
• The replaced structure is no farther seaward than the original
• Where possible, the replacement is moved landward of the setback line — or if not possible, as far landward as practicable, considering local zoning and parking rules
• The reconstruction is not seaward of the baseline

For destruction beyond repair due to manmade causes, § 48-39-290(B)(1)(b)(v) allows replacement provided the rebuilt structure is no larger than the original and is built as far landward as possible, and never farther seaward.

Repair or renovation of a structure damaged but not destroyed beyond repair is allowed under § 48-39-290(B)(1)(b)(iii).

So the honest framing for a buyer: you are buying a right to rebuild that is capped at what exists today and pushed landward where the lot allows. If the lines move seaward-to-landward at the next review, that envelope can tighten.

Seawalls and bulkheads have their own cliff

If the property is protected by an existing seawall, bulkhead, or revetment, § 48-39-290(B)(2) is essential reading. No new erosion control structures or devices are allowed seaward of the setback line, except structures protecting a public highway that existed on June 25, 1990, and certain shoreline-perpendicular wingwalls.

Existing devices may be maintained but "must not be enlarged, strengthened, or rebuilt," and repairs must use similar materials. And there's a hard threshold: an erosion control structure or device may not be repaired or replaced if destroyed more than fifty percent above grade (the statute steps this down over time — 80% through June 30, 1995; 66⅔% from July 1, 1995 through June 30, 2005; 50% after June 30, 2005).

Then § 48-39-290(B)(2)(c): structures destroyed beyond the allowed percentage "must be removed at the owner's expense."

The statute even sets out how the percentage is judged — length parallel to the shoreline still intact versus length destroyed, assessed by a registered professional engineer, with a dispute resolved by a third engineer whose determination is conclusive. That level of detail exists because the outcome is expensive.

The Lines Are Being Redrawn Right Now

Under § 48-39-280(C), baselines and setback lines "must be established anew during establishment cycles that are not less than every seven years, but not more than every ten years." SCDES BCM confirms the same cadence and states that on January 30, 2024 it released a tentative schedule for new lines, with the review running as a phased effort between 2024 and 2028.

For a buyer, that means two things:

1. Check where your beach sits in the schedule. SCDES publishes the tentative schedule and updates it on the jurisdictional lines page. Lines take effect on their date of establishment.
2. Understand the baseline can't move seaward. § 48-39-280(A)(4) provides that a baseline established under the section "must not move seaward from the most seaward location" of the 2008–2012 cycle line, the line proposed October 6, 2017, or that proposed line as revised on a review initiated before January 1, 2018. The practical direction of travel is landward.

There's also a storm carve-out worth knowing: under § 48-39-280(E)(4), if an erosion zone incurs extraordinary erosion from a storm system named by the National Weather Service after June 1, 2018, data collected from that zone within eighteen months of the impact must not be used to locate dune crests or establish baselines.

If you think the line is wrong

§ 48-39-280(F) gives a landowner a right of review on submitting substantiating evidence. SCDES describes the current process — as amended by Act 146, signed May 15, 2026 (H.4189) — as a request filed with the Division of Coastal Management by certified mail within one year of the establishment of the line, with a $100 review fee per property, sent to SCDES BCM in North Charleston, and a right to request a contested case hearing at the Administrative Law Court within 30 calendar days of the final agency decision.

Note that the statute text published on the General Assembly's site may lag a recent amendment. If you're relying on the appeal mechanics, confirm the current version with SCDES and your closing attorney.

How to Find the Lines on an Actual Property

SCDES BCM publishes a Beachfront Jurisdictional Lines Viewer showing the approximate locations of the baseline and setback line along with adopted long-term erosion rates. Use it for screening.

But read the agency's own caveat, because it's the operative point: "to determine the exact position of the baseline and setback line for a specific property, coordinates must be obtained by downloading data from the Beachfront Jurisdictional Lines Viewer and a property-specific survey must be performed." Coordinates can also be obtained by calling SCDES BCM at (843) 953-0200. The lines are published in State Plane NAD83 (2011).

In practice, for any oceanfront purchase where your plans involve more than moving in, a survey locating those lines on the actual lot is money well spent during due diligence.

SCDES also warns that "there may be critical areas landward of the jurisdictional setback line that may also require authorization" — so being behind the setback line is not automatically the end of the inquiry.

What Else Is Different About a Coastal House

The state lines are the part nobody tells you. These are the parts a good inspector and a good agent will:

Salt does slow, expensive damage. HVAC condensers, fasteners, hurricane straps, garage door hardware, railings, light fixtures, and window and door hardware all corrode faster within sight of the water. Ask when the HVAC was replaced and what maintenance the exterior metal has had.

Elevated construction has its own failure modes. Pilings, ground-level enclosures, breakaway walls, and the stairs and decks attached to them are their own inspection scope. Ask specifically whether anything below the elevated floor has been converted to conditioned space, and whether that conversion was permitted.

Water intrusion history matters more than water intrusion risk. Ask for repair records, not reassurances.

Wind and hail may be a separate policy. On this coast that coverage is frequently carved out of the homeowners policy and written on its own, with its own deductible. Quote it during due diligence — see wind insurance in coastal South Carolina.

Flood zone is a separate system entirely. The FEMA map and the state's beachfront lines are different regimes drawn by different agencies for different purposes, and a property can be affected by both. Understanding flood zones covers how to look up a specific address, and what Myrtle Beach adds on top of the federal rules.

And there's a disclosure that attaches to the sale itself. If the property lies in whole or in part seaward of the setback line or jurisdictional line, § 48-39-330 requires specific content in the contract. I cover what that has to contain in South Carolina seller disclosure requirements.

A Beachfront Due Diligence Checklist

1. Pull the property on the Beachfront Jurisdictional Lines Viewer before you write the offer.
2. Call SCDES BCM at (843) 953-0200 with the address and ask what jurisdiction applies.
3. Order a survey locating the baseline and setback line on the lot if you have any plans beyond moving in.
4. Ask what's already permitted and what isn't — decks, pools, enclosures, walkways, seawalls. Documentation of prior authorizations should exist.
5. Ask about the erosion control device, if there is one: what condition, what's the repair history, and what happens under the 50% rule.
6. Confirm the rebuild envelope — current heated square footage, footprint seaward of the setback line, and linear footage parallel to the coast. That's your ceiling.
7. Check where your beach falls in the 2024–2028 line review schedule.
8. Get wind and flood quotes during due diligence, not after.
9. Bring your closing attorney in early. South Carolina requires one at closing anyway — SC Bar Ethics Advisory Opinion 05-16 — and beachfront questions are exactly what you want a lawyer looking at before the due diligence period runs.

Frequently Asked Questions

What is the difference between the baseline and the setback line? The baseline is the seaward line, generally set at the crest of the primary oceanfront sand dune. The setback line is landward of it, at forty times the average annual erosion rate or at least twenty feet. SCDES describes the setback line as "the landward extent of the state's direct permitting authority" within the Beach/Dune System Critical Area.

Can I build a new house on an oceanfront lot? Not seaward of the baseline — § 48-39-290(A) prohibits new construction and reconstruction there, subject to the narrow exception list. Between the baseline and the setback line, a new habitable structure is possible with written certification to the department and within the 5,000 square feet of heated space limit, located as far landward as practicable.

If a hurricane destroys the house, can I rebuild it? Generally yes, but not bigger and not farther seaward. § 48-39-290(B)(1)(b)(iv) caps the replacement's square footage seaward of the setback line and its linear footage parallel to the coast at the original's, requires it be no farther seaward, and requires moving landward of the setback line where possible.

Can I repair the seawall? Maintenance is allowed if the device isn't destroyed more than fifty percent above grade, and repairs must use similar materials — it may not be enlarged, strengthened, or rebuilt. Beyond that threshold it must be removed at the owner's expense.

Does this apply to a condo? The chapter governs the property, not the ownership form — but in a condo the association typically controls the land, the dunes, the pool, and any erosion control structure, so the practical questions move to the regime's documents and reserves. Start with my condo buying guide.

Do these lines tell me whether I need flood insurance? No. That's the FEMA flood map, a separate federal system. See why the zone decides what your lender can do.

How often do the lines change? Every seven to ten years by statute. SCDES BCM's current review is a phased effort running 2024 through 2028.

I'm not oceanfront — does any of this affect me? Possibly. SCDES notes there may be critical areas landward of the setback line that also require authorization, and the Coastal Waters and Beaches critical areas reach beyond the front row. If you're near a marsh, an inlet, or the waterway, ask.

Let's Look at the Lines Before You Look at the Furniture

Oceanfront is the most emotional purchase on this coast and the one with the most regulatory texture underneath it. The good news is that all of it is knowable before you're committed — the viewer is public, the statute is public, and SCDES will talk to you on the phone.

If you're considering something on the water anywhere from Little River to Pawleys Island, get in touch and we'll work through it property by property. My resources page lists the surveyors, inspectors, and closing attorneys I work with, and you can browse current listings whenever you're ready.

One note specific to this topic: the statute text published by the General Assembly can lag a recent amendment — SCDES describes § 48-39-280(F)'s review process as amended by Act 146 of 2026. For anything you intend to rely on, confirm the current version with SCDES BCM and your closing attorney.

Thinking about making the move to the Grand Strand?

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