Custom home builder in Southport, North Carolina, at the mouth of the Cape Fear.

Southport is still a river town. The lots show it.

Southport began as Smithville, platted in 1792 and named for Benjamin Smith, a state legislator and Senate speaker who was elected governor in 1810. It was the seat of Brunswick County from 1808 until 1975, when a county referendum moved the seat inland to its present site near Bolivia, and it took the name Southport in 1887 in a bid to sell itself as a shipping port. The shipping trade never grew into what the name promised. The river pilots stayed, and their boats still work from the Bay Street waterfront alongside the shrimp boats and the Yacht Basin, which is why the town still feels organized around its harbor. Smithville survives as the township name, in the way longtime residents talk, and in the shape of the streets. The town itself grew up around Fort Johnston, an eighteenth-century post at the river mouth, and the fort's Garrison House, its one early building still standing, now holds the Fort Johnston-Southport Museum and Visitors' Center.

That shape matters to anyone buying a lot. The original plat is a compact grid of short blocks: Bay Street along the water, Moore a block behind it, Howe running inland at right angles to both, and the short streets between them, all under a canopy of live oaks the city now regulates as an Urban Maritime Forest. Lots inside the grid are small by the standard of any modern subdivision, and a lot recorded under that plat can fall short of the width or area the current ordinance sets for its district. It stays buildable because the UDO's rule for nonconforming lots of record (Sec. 3.20.C) lets a lot recorded before the ordinance serve as a building site for a permitted use, provided the setbacks and every other standard are still met. That rule is why an old in-town lot can carry a new house at all, and it is the first thing to read when one comes on the market.

The second kind of lot faces the water. Parcels along the river, around the Yacht Basin, and out toward the marinas tend to run deeper and wider than a grid lot, and they face the open mouth of the Cape Fear, with Bald Head Island low on the horizon and the shipping channel between. The river is more than a mile across here. Wind arrives over that width with nothing to slow it, salt travels with it, and the flood map takes a closer interest in the ground. A buyer choosing between a cottage lot on the grid and a riverfront parcel is choosing between two different design problems, and the house that comes out of each should look like it knows which one it is.

People come to Southport for plain reasons: a town that can be walked end to end, a harbor that still works, the passenger ferry to Bald Head Island and the state ferry across to Fort Fisher, and a canopy that makes July bearable. The grid, the pilots, and the river explain why the lots are shaped the way they are, and every design question on a Southport lot traces back to which of the three shaped it.

What Southport asks for before anything gets built.

Inside the city limits, one document carries nearly all of the land-use rules: the Southport Unified Development Ordinance, with review procedures in Article 2, zoning in Article 3, flood damage prevention in Article 5, stormwater in Article 6, and definitions in Article 8. The Historic Preservation Commission's rules sit outside it, in the general Code of Ordinances, and reach a lot only where the city has designated a local historic landmark or district by ordinance. Since 2024 the city limit is also the edge of the city's authority. The General Assembly relinquished Southport's extraterritorial jurisdiction that July, and the land between the old limits and the Duke Energy Canal has been zoned and permitted by Brunswick County since late August of that year. Which ordinance a Southport lot answers to is a parcel-level fact, and the county's parcel map settles it.

Jurisdiction

City of Southport inside the city limits; the former ETJ has been Brunswick County's since August 28, 2024

Adopted code

Southport Unified Development Ordinance (Arts. 2, 3, 5, 6, and 8 for a house); Code of Ordinances Ch. 2, Art. IV, Div. 3 for historic review

Who reviews

UDO Administrator (minor site plans, zoning permits); city building inspector (building permits); Floodplain Administrator (Art. 5 permits); Board of Adjustment (special use permits); Historic Preservation Commission (certificates of appropriateness in a locally designated district)

Flood-map source

FEMA Flood Insurance Rate Map for the parcel, read through the NC Flood Risk Information System (fris.nc.gov)

Ultimate design wind speed

150 mph east of US 17 (2018 NC Residential Code, Table R301.2(4), footnote c)

CAMA

NC DEQ Division of Coastal Management along the river and the Intracoastal Waterway; docks, piers, and bulkheads built to 15A NCAC 07H and Corps setbacks (UDO Sec. 3.6.E)

Most houses in the city sit in one of two base districts among the thirteen the UDO establishes (Sec. 3.2.A): R-10, single- and two-family residential on a 10,000-square-foot minimum lot, and R-20, single- and two-family residential-agricultural on 20,000. Table 3.2 (Sec. 3.9) lists, for an R-10 lot, a 75-foot minimum width, a 25-foot front setback, 20 feet at the rear, 8 feet at the side subject to a table footnote, and a 40-foot height limit; for R-20, 100 feet of width, 40 feet at the front, 25 at the rear, 12 at the side, and the same 40-foot cap. How that height is measured on a house whose lowest floor has been raised for flood is a question to settle with the city's planning staff before the elevations are drawn, and on an irregular lot the UDO Administrator decides which yard is which (Sec. 3.9.A.2). A single-family dwelling is permitted by right in both districts; a duplex and a residential accessory dwelling are special uses (Table 3.1).

A house here has one more step between the drawings and the building permit. Section 2.7.A requires a minor site plan for new single-family and duplex construction, for any renovation that changes the footprint of an existing structure, and for accessory structures, fences, docks, decks, and driveways. It is filed with the building permit application, sealed by a North Carolina-licensed surveyor, landscape architect, or engineer (small accessory structures and simple site features are exempt from the seal), and reviewed by the UDO Administrator within 30 working days of a complete submission. Approval lasts six months. The zoning permit issues on the strength of it, and the city's building inspector issues the building permit. Water and sewer service inside the city is provided through Brunswick County Public Utilities, which removes the well-and-septic question from an in-town lot and leaves it open on a parcel outside the limits.

Southport's live oaks have their own rules.

Section 3.18 opens by naming its purpose: to manage the city's Urban Maritime Forest and its tree canopy, and to protect the signature heritage live oaks. The mechanism is the tree impact permit. A Regulated Tree, meaning any hardwood of 8 inches diameter at breast height or more and any conifer of 12 or more, needs one before it is removed or its critical root zone disturbed if it stands within a setback on a platted residential lot; a Specimen Tree, 30 inches or more of any species, needs one wherever it stands. Residential lots also carry a retention floor scaled to lot size, from one broadleaf canopy tree on the smallest lots up to five at 20,000 square feet and beyond (Sec. 3.18.F.3.a), and a new house needs an as-built tree survey before its certificate of occupancy issues (Sec. 3.18.D.2).

The section is stricter about sequence than about outcome. Nothing over 3 inches in diameter may be cleared before a zoning or tree impact permit issues (Sec. 3.18.I), and a violation brings a minimum one-year delay on any city development approval on top of the per-inch civil penalties in Section 3.18.P. Where a regulated tree does come down on a one- or two-family lot, mitigation runs at a quarter of the diameter removed rather than inch for inch; replacements must be at least a quarter heritage live oak and at least half canopy trees; and a heritage live oak kept standing earns credit at two, three, or four times its diameter depending on its size (Sec. 3.18.H). During construction, every protected tree's full critical root zone is fenced at least 4 feet high, with no grading, no fill deeper than 3 inches, no material storage, and no concrete washout inside it (Sec. 3.18.J). The practical answer is to survey the trees before the house is drawn, which is where the site analysis Tropical Tides delivers before design begins on a Southport lot.

The river decides how hard the wind hits.

Every house in Brunswick County is designed to an ultimate design wind speed set by Table R301.2(4) of the 2018 NC Residential Code, and the table's footnote c draws the county's line at US 17: 140 mph west of it, 150 mph east. Southport lies entirely on the coast side, so 150 mph applies on every lot in the city, from the Bay Street waterfront to the last parcel before the county's zoning begins. The number sets the structural baseline.

How hard the wind reaches a given wall depends on what stands between it and the water, and the code's exposure categories (Sec. R301.2.1.4) settle it one direction at a time. Two blocks into the grid, under the oaks, a house has neighbors and canopy on most sides and usually reads as sheltered. On the Bay Street waterfront the same house faces more than a mile of open river, takes the wind straight off the water on that side, and stays sheltered on the others. The structural engineer sets the category for each direction as part of the design, and it is one of the first things the site analysis writes down.

Because the wind speed here clears 130 mph, Section R301.2.1.1 takes every house in the city out of the code's simplified prescriptive tables and into one of the referenced high-wind standards: the Wood Frame Construction Manual, ICC 600, ASCE 7, or the International Building Code. In Southport a load path designed to one of those standards is the minimum on every lot. The same 150 mph designation brings every house in the city under Chapter 46 of the NC Residential Code, the state's coastal and flood construction chapter, which Section R4601.1 applies throughout the 150 mph wind zone as well as in coastal high hazard, ocean hazard, and regulatory floodplain areas; on a Southport lot it governs whether or not the flood map touches the parcel. The case for a coastal-specific standard, that salt, pressure, humidity, and sun are design inputs, reads as a plain description of ordinary conditions on this waterfront.

Then there's the flood zone.

The flood map is the other document that shapes a Southport house, and it is read parcel by parcel. Where the FEMA Flood Insurance Rate Map places a lot in a Special Flood Hazard Area, the UDO's Article 5 sets a regulatory flood protection elevation of the Base Flood Elevation plus three feet of freeboard, or at least three feet above the highest adjacent grade where no BFE has been published (Sec. 5.5). New construction and substantial improvement must bring the reference level, the top of the lowest floor in an A or AE zone and the bottom of the lowest horizontal structural member in a VE zone, up to that elevation (Sec. 5.20.A), and whatever sits below it is limited to parking, access, and storage, built of flood-resistant materials with at least two flood openings on different sides sized to the enclosed area (Sec. 5.20.D). The city's floodplain program dates its own history in the definitions: the first floodplain ordinance was adopted in May 1974 and the initial FIRM took effect in April 1977, which is the line between pre-FIRM and post-FIRM houses downtown.

A lot the map places in a Coastal High Hazard Area carries a further set of rules (Sec. 5.24): construction landward of the reach of mean high tide and the first line of stable natural vegetation, compliance with the applicable CAMA setback, a pile or column foundation engineered for wind and water acting together, no fill for structural support, a non-conversion agreement recorded with the county before the permit issues, and a V-Zone certification from an engineer or architect. Along the river and the Intracoastal Waterway, the state's coastal shoreline Areas of Environmental Concern add a CAMA layer of their own. The width of that shoreline band and the limits inside it come from the Coastal Resources Commission's rules, and the Division of Coastal Management is the office to confirm them with. These lines come from the FIRM panel for the parcel, read through the NC Flood Risk Information System, and from the parcel's own survey.

Salt is the constant underneath all of it. Onshore wind carries ocean spray in between Bald Head Island and Caswell Beach, up the river mouth, and across open water to the Bay Street waterfront, and it carries well past the shoreline: airborne chloride settles every day on the fasteners, the hurricane connectors, and the condensing unit of a house that will never see a wave. Hardware, connectors, and outdoor equipment chosen for salt carried up the river mouth belong on a house three blocks in, under the oaks, as much as on Bay Street.

Before we draw anything, we read the lot.

Before a Southport project has a drawing, it has a written site analysis, delivered to the client and filed as the first entry in their online project file. On this ground it answers a specific set of questions: the parcel's flood zone from the FIRM and the reference level that follows from it; the exposure category by direction; the trees Section 3.18 regulates and where their root zones fall; how the sun crosses the lot under a canopy in January and again in July; where water goes when it rains; which sightlines toward the river or the basin deserve glass; and whether the historic district, the ETJ transfer, or a CAMA shoreline touches the lot at all. Every design decision that follows is expected to trace back to something in it.

On a grid lot the tree survey usually carries the most weight, because it constrains the footprint before the setbacks do. Mapping which oaks meet the regulated or specimen definitions, which stand inside a setback, and which critical root zones a foundation, a driveway, or a utility trench would cross has to happen before the plan is drawn. A heritage live oak found in the way at permit stage is a redesign; one designed around from the start earns mitigation credit and keeps the shade that made the lot worth buying. The as-built survey the city requires before occupancy is easier to pass when the design never asked the trees to move.

Drainage gets equally early attention, for a practical reason: the grid was platted long before curb and gutter, and how water leaves a particular block is closer to a lot-level fact than a citywide rule. The UDO's stormwater article, adopted in September 2025, reaches ordinary house construction through its definition of minor development, 800 square feet or more of new impervious surface or more than 2,000 square feet of disturbance, and asks that scale of project for erosion and sediment control, infiltration measures sized to the new impervious area, soil testing for permeability and the seasonal high water table, and a recorded maintenance agreement (Sec. 6.2.B). How the city applies that to a single house is a conversation with the planning office. Knowing where the lot drains and where the water table sits before design starts is what keeps it a short one.

How close the neighbors sit

An 8-foot side setback in R-10, or 12 feet in R-20, puts a neighbor's roofline nearer the property line than a buyer arriving from a larger-lot subdivision expects, and the analysis maps that relationship along with the rest: where the neighboring eaves and gutters fall, where a retained oak will shade a wall at three in the afternoon, which windows would look at the river and which at siding. On a riverfront parcel the same exercise turns outward, to the fetch across the water, the CAMA line, where a dock or bulkhead can sit under the UDO's use standards and the state's rules (Sec. 3.6.E), and the riverfront-garage exception that changes where a garage can go. The deliverable is the same either way: a document the client can read, argue with, and keep.

A live oak found in the way at permit stage is a redesign. One designed around from the start is shade.

The same standard on the river and under the oaks.

Stand on a waterfront lot along Bay Street with a storm coming in and the river makes the case before anyone names a standard: more than a mile of open water, nothing on it to slow the wind, and a house whose roof edge, sheathing, and wall-to-foundation connections take the full pull of that fetch. On a lot like that the load path is a literal thing, the roof-edge detail, the sheathing fastening schedule, the strap from rafter to stud to sill to foundation, each carrying the uplift the river will apply. Every Tropical Tides project pursues the FORTIFIED Gold designation against that load, the top tier of the Insurance Institute for Business & Home Safety's program, and IBHS's third-party verification decides whether a house earns it. A verifier with no stake in the design is what makes the designation worth writing down, and many insurers recognize it.

Airtightness has its own argument on this ground. An August afternoon at the river mouth pushes air close to saturation against every unsheltered face of a house, and a leaky envelope is how that air finds a cool surface inside a wall. So every project is drawn to a design target of sub-1.0 ACH50, fewer than one air change per hour with the house held at a 50-pascal pressure difference, and holding it takes an air barrier traced through every junction: each window rough opening, each penetration, each place where roof, wall, and floor meet. Sub-1.0 ACH50 Without Stuffy Interiors sets out how that tightness pairs with ventilation so the house does not go stale. Until the test runs, the target is a line in the drawings and nothing more. The blower door goes into an exterior doorway of the client's own finished house before the keys change hands, and the figure it reads becomes the airtightness number that house is described by.

Shade is good for people and hard on walls.

Shade is one of the better reasons to buy a grid lot, and it is also a variable a wall has to dry against. An elevation shaded most of the day by a retained live oak never gets the solar drive that pulls moisture out of cladding and sheathing on a sunlit wall, so the assembly on that side is asked to rely more on its drainage plane, its ventilated cavity, and the house's mechanical dehumidification, and less on the sun. Planning for moisture before it appears is the general case; a north wall under an oak canopy three blocks from the river is the Southport-specific one. It is decided elevation by elevation, on the specific lot.

The shade that makes a grid lot pleasant in July is the shade its north wall has to dry against.

The mechanical system comes last in that sequence and is sized from a room-by-room load calculation for the specific house. A tight envelope under a live oak canopy carries a modest sensible load and a persistent latent one, the moisture in the air rather than its heat, and equipment picked from square footage alone will satisfy the thermostat well before it has dealt with the humidity. Where the calculation shows the latent load outrunning what the cooling equipment removes on its own, the whole-house moisture strategy turns to dedicated dehumidification rather than a larger unit. These are design targets. FORTIFIED Gold is pursued and IBHS decides whether a house earns it; sub-1.0 ACH50 stays a design target until the blower door on that house reports the number.

New construction in Southport starts with which lot you have.

New homes in Southport, on the grid or on the river

Custom homes on Southport lots take one of two forms. The first is infill: a new home on a grid lot, working inside the setbacks of Table 3.2 or, where the lot predates them, inside the nonconforming-lot-of-record allowance in Section 3.20.C, around the trees Section 3.18 regulates, and often beside a house built before any of these rules existed. The second is a house on a riverfront or marina-area parcel, where the lot is larger and the wind, flood, and CAMA questions carry more of the weight. The design comes out of the site in both cases, because a plan drawn for a flat open lot somewhere else has no answer for a specimen oak in the side setback or a VE line at the back fence. Reading the parcel before drawing it is the first phase of the work, and the minor site plan the city requires is one of its outputs.

If the house is already standing

Renovating an older Southport house carries a layer new construction does not, because much of the housing downtown is old enough to have been built under no floodplain rule at all. The UDO treats a house begun before May 1974 as an existing building and a house built before April 1977 as pre-FIRM, and it treats repairs, additions, or improvements whose cumulative cost within a year reaches half the structure's market value as a substantial improvement that must meet new-construction flood standards (Sec. 5.20.E). Any renovation that changes the footprint needs a minor site plan.

Where the lot sits inside a locally designated historic district, the Historic Preservation Commission's certificate of appropriateness comes before the building permit for exterior work, meaning new construction, alteration, repair, and even fences, steps, and pavement, and a permit issued without one is invalid (Code of Ordinances Sec. 2-199); staff may approve minor works, the commission has 90 days to act on a complete application, and a certificate is good for 180 days. For a historic structure in the floodplain, the Board of Adjustment may grant a variance for repair or rehabilitation that would not cost the building its designation, after telling the applicant in writing that building below the BFE raises flood insurance premiums (Sec. 5.18). Bringing an older Southport house to a tighter envelope and a drier wall, without losing what made it worth keeping, is the kind of work the practice designs and directs.

An ADU in Southport goes to a public hearing.

Table 3.1 lists a residential accessory dwelling as a special use in R-10 and R-20, and that classification shapes the whole path. An accessory dwelling on a city lot goes to the Board of Adjustment as a quasi-judicial hearing, with notice mailed to abutting owners and posted on the lot, and the board must make four written findings, that the use poses no material danger to public health or safety, that every required condition is met, that adjoining property is not adversely affected, and that the use is in harmony with the area and the comprehensive plan, before it can approve one (Sec. 2.7.C). The application carries its own minor site plan, which a licensed professional may prepare but need not (Sec. 2.7.C.3.a); an approved permit is recorded with the county and lapses if unused within twelve months. Once granted, Section 3.6.C sets the shape:

• One accessory dwelling per deeded lot, within, attached to, or detached from a principal single-family house, under the same owner, sharing its driveway, with a parking space of its own.
• An 800-square-foot cap on the unit; where it sits over a detached garage, a 530-square-foot cap on the garage's ground floor.
• A detached unit behind the front building line, riverfront lots excepted, and at least 5 feet from any adjoining lot line.

The riverfront exception is Southport's own. Section 3.6.A permits a detached garage in the street front yard on an R-10 lot with Cape Fear River frontage, provided it stays at least 75 feet from the right-of-way, and R-10 and R-20 lots in general are limited to two accessory structures, covering no more than half the rear yard and rising no more than 30 feet. On a deep river lot that moves the garage, and any unit above it, toward the street and away from the water. The ordinance sets the envelope, and the specific lot decides what fits inside it. The coastal questions an ADU raises, elevation, salt, and the tightness of a very small envelope, are answered on the specific parcel, and the planning office confirms how each standard reads there.

We're based here, and so is the permit counter.

Tropical Tides is based in Southport, so for a client here the practice, the lot, and the permit counter share one small city, and a site visit during design or construction is an errand of minutes. Inside the limits that counter is the planning and inspections office at City Hall, 1029 North Howe Street, where the minor site plan goes in with the building permit application and the zoning and building permits come back out. The Board of Adjustment and the Historic Preservation Commission are city boards too, so a special use hearing for an accessory dwelling or a certificate of appropriateness for exterior work stays in town as well.

A lot in the former ETJ changes the errand. Its zoning and building permits go through Brunswick County instead, at the central permitting office in Building I of the county government center in Bolivia, and county inspectors rather than city inspectors walk its footings and framing. Along the river and the waterway a third authority enters: the state's Division of Coastal Management, whose CAMA use standards the UDO requires every dock, pier, and bulkhead in the city to meet (Sec. 3.6.E). Knowing which of those three a lot answers to, and in what order, is part of the first site visit.

What being close actually changes

Working in the same town means fewer decisions made without someone from the practice standing on the lot: the tree-protection fencing checked before the excavator arrives, the flashing sequence at a river-facing window watched as it goes in, the framing detail that reads fine on paper and wrong in the sun caught mid-build. On a Southport project that difference is measured in minutes, and it shows up in how closely the finished detail matches the drawn one.

Proximity also changes what the project record holds. The site analysis, the tree survey, and the minor site plan would be the same documents from any distance, but on a Southport project more of the entries are made in person: the root-zone fence photographed the morning it goes up, the flood openings counted against the drawing before the enclosure below the house is finished. When a Southport lot is in view, an inquiry that names the parcel lets the first conversation be about its oaks, its flood panel, and which counter it answers to. Tropical Tides holds NC Residential Contractor License #109520, belongs to the Brunswick County Home Builders Association, and answers at 910-946-5512. Each build is partner-executed under the practice's direction and recorded in the client's private workspace.

A Southport address can sit outside Southport.

A Southport address covers more ground than the city limits. Indigo Plantation and its marina, on the waterfront where the river meets the Intracoastal Waterway, straddles the city limit and land that was the city's extraterritorial jurisdiction until 2024. The ferry to Bald Head Island once left from Indigo's own marina; it now runs from Deep Point Marina on Ferry Road, a passenger crossing of roughly twenty minutes. Which ordinance an Indigo-area parcel answers to is a parcel-level fact, and one that has changed recently enough to check twice.

The 2024 transfer made that literal along the approaches. The General Assembly relinquished Southport's extraterritorial jurisdiction effective July 1, 2024, and by the county's count reported at the time, 615 parcels and roughly 1,900 acres, the land north, east, and west of the city limits out to the Duke Energy Canal, including much of the frontage along NC 211 and NC 87, received Brunswick County zoning that August, with building permits and planning applications moving to the county on August 28. A lot on those roads that reads as Southport is now reviewed under the county's Unified Development Ordinance by county planning staff and county inspections, and the county's parcel map is where that status is confirmed before a design assumes either code.

Neighbors by road and by ferry

Southport is a hub of ferries and short drives, and several of the communities in the practice's three-county service area sit across the water from it. The state's Southport–Fort Fisher ferry crosses the river mouth from its own terminal on Ferry Road to the Kure Beach side, first come, first served; the Bald Head passenger ferry leaves from Deep Point. By road, NC 211 runs northwest from Howe Street past St. James toward US 17, NC 133 turns south for the bridge to Oak Island, and NC 87 runs inland through Boiling Spring Lakes toward Wilmington, about forty-five minutes away.

• Oak Island, across the Intracoastal Waterway to the southwest, where the same 150 mph wind zone meets a barrier-island lot and a canal instead of a river mouth.
• Caswell Beach, its own town at the eastern end of Oak Island, facing the mouth of the Cape Fear.
• St. James, a gated town along NC 211, where the community's architectural review generally sits on top of the town's code.
• Kure Beach, across the river by the state ferry, in New Hanover County and under its own town code.
• Winnabow, inland up NC 87 toward the US 17 corridor, zoned and permitted by Brunswick County.

Every one of them is close enough that the practice can walk a Southport lot in the morning and an Oak Island lot after lunch. The conditions change from place to place, canal frontage, dune line, ferry logistics, county review, and the design changes with them. The site analysis, the standard it feeds, and the workspace that holds both stay the same.