Grand Cay Harbour is the quiet answer to a question a lot of Galveston County boat owners ask badly. They search for waterfront and end up looking at Kemah restaurant traffic or Tiki Island price tags, when what they actually wanted was a bulkheaded lot, a place to keep the boat behind the house, and a street where nobody is parallel parking for the boardwalk. Finding the best waterfront realtor in Grand Cay Harbour is less about who sells the most houses in Texas City and more about who can read a waterfront lot correctly before you write an offer.
Waterfront is not one market, and Grand Cay Harbour is a specific slice of it
Buyers use "waterfront" to mean five different things. On the Galveston County mainland the differences are worth six figures.
| Waterfront type | What you actually get | Who it suits |
|---|---|---|
| Open bay frontage | Big views, maximum exposure, highest insurance | View buyers who do not boat daily |
| Bulkheaded canal lot | Protected water at the back door, boat lift feasible | Working boat owners |
| Marina slip access, no water lot | Boat access without waterfront maintenance | Part-time boaters |
| Water view, not water access | The view without the bulkhead bill | Budget-conscious view buyers |
| Wetland or preserve adjacency | Privacy and wildlife, limited or no navigation | Privacy buyers |
Grand Cay Harbour sits in that second category, off Palmer Highway past Highway 146 along the protected shore of Galveston Bay, backed by preserve land. The practical consequence is that the water behind the house is calmer than open bay frontage, and the maintenance item you inherit is the bulkhead rather than a seawall. Ask for the bulkhead's age and last repair before you fall in love with the view, because that single number moves the value of an otherwise identical lot.
The Grand Cay Harbour market snapshot
The neighborhood is small and relatively young, which makes its numbers unusually readable compared to a sprawling older waterfront market.
| Metric | Grand Cay Harbour |
|---|---|
| Single-family properties | About 160 |
| Median home size | 2,385 sq ft |
| Median lot size | 6,681 sq ft |
| Median year built | 2016 |
| Median market value | $563,035 |
| Sold price per sq ft | $217.08 |
| Neighborhood value range | $471,000 to $687,000 |
| Recent activity | About 11 active listings, 26 sold |
| School district | Texas City ISD |
| ZIP | 77590 |
Figures reflect public directory data for the subdivision and can change. Streets to know include Allen Cay Drive, Highborne Cay Court and Brigantine Cay Court. The developer still offers homesites where a buyer purchases the lot and brings a builder, and both production and custom builders have delivered here, which is why two houses with the same square footage can be built to noticeably different standards.
That mix of resale and buildable lots is the part outside agents get wrong. In a 160-home neighborhood, three active waterfront listings is not a slow market and eleven is not a crash. It is a small sample, and pricing it off Texas City's citywide averages, which are pulled down by a very different inland housing stock, will cost a seller real money.
The factors most waterfront buyers miss
| Overlooked factor | Why it matters here | What to do about it |
|---|---|---|
| Flood zone is per lot, not per neighborhood | Texas City sits behind the Texas City Hurricane Flood Protection Levee system, but FEMA zone and base flood elevation still vary parcel to parcel | Pull the flood map and elevation certificate for the exact address before you rely on any community-level claim |
| Windstorm coverage | Coastal windstorm is priced separately from flood and from homeowners | Get all three quotes before the option period ends, not after |
| Bulkhead condition and responsibility | Repair or replacement is a major capital item | Confirm in writing whether it is homeowner or association responsibility |
| Boat draft and air draft | Not every canal lot suits every boat | Measure your actual vessel against the route, including any fixed structures |
| Insurance history on the specific home | Prior claims follow the property | Request the CLUE report early |
| Levee and floodgate operations | The Moses Lake floodgate has undergone extended maintenance closures | Understand how a closure affects access before you buy the boat lift |
Do not accept a marketing sentence about flood risk as a substitute for a document. Community materials in coastal Texas often describe protective infrastructure accurately and then let buyers draw a broader conclusion about insurance than the paperwork supports. The elevation certificate and the current FEMA panel are the only things a lender or an insurer will price from, and they are cheap to obtain.
Buy resale or buy a homesite and build
| Option | Upside | Trade-Off |
|---|---|---|
| Grand Cay Harbour resale | You see the finished bulkhead, dock and elevation; you can inspect what you are buying; immediate use | You inherit somebody else's finishes and their deferred maintenance |
| Buy a homesite and build | Elevation, layout, lift and dock built to your boat and your risk tolerance | Longer timeline, construction financing, and coastal build costs that surprise inland buyers |
| Bay-view rather than canal-front | Lower entry price and lower maintenance burden | No water access, and the resale pool is different |
For most buyers arriving from Houston or Clear Lake, a resale with a documented, recently inspected bulkhead beats a lot purchase, simply because coastal construction costs are the single most underestimated line item in this market. Galveston County's median days on market was 72 in July 2026, which means a well-prepared waterfront buyer has room to do the diligence properly rather than waiving it to win.
Why the Mandie McMillan Team, Client for Life rather than one closing
Selling a waterfront home is a marketing problem before it is a pricing problem. The buyer for a Grand Cay Harbour house is frequently not in Texas City today. They are in Clear Lake, in Houston, or relocating in, and they need to be reached where they are.
Mandie McMillan has spent 26 years in this business and 50 years in Galveston County, born and raised in La Marque, at the center of the county. She is the 2026 Chair of the Texas City-La Marque Chamber of Commerce, after four years on its executive board, and she is actively focused on the economic development of Texas City and the surrounding area. That is not a tagline on a waterfront listing in Texas City. It is the reason she knows what is being built, permitted and planned around the port before it shows up on a listing site.
She is a RE/MAX International Hall of Fame inductee and a repeat RE/MAX Chairman's Club and Platinum Club honoree, holds the Certified Luxury Home Specialist and Seller Representative Specialist designations, and served as 2017 President of the Bay Area Women's Council of Realtors chapter and 2018 Texas District Vice President. In 2025 the team closed 75 sides and $22,127,458 in production volume with only six producing agents, and Mandie personally closed 30 sides and $11,676,748. Roughly 12.5 sides and $3.7 million per agent is depth, not headcount.
The commitment is Client for Life. A permanent advisor in the same tier as your doctor, lawyer or CPA, who is still answering the phone about your bulkhead five years after closing.
Thinking about buying or selling on the water in Grand Cay Harbour? Contact The Mandie McMillan Team at RE/MAX Coastal and let us walk the lot with you before you write anything.
