If you are searching for the best realtor to sell your house in Grand Cay Harbour, you are not selling a Texas City house. You are selling a waterfront address in a bayside community of roughly 160 homes, built mostly since the mid-2010s, sitting behind the Texas City-La Marque hurricane flood protection levee. That combination is rare enough that the city average is useless to you and the county average is worse. Your agent has to explain your water, your levee, and your insurance profile to a buyer who has never heard of Moses Lake.

Why Grand Cay Harbour sells on its own comp set

Most Texas City listings compete on price per foot in a value market. Yours competes on water access, view type, and elevation. A wetland-view lot, a canal lot with a bulkhead, and an interior lot near the boat ramp are three different products on the same street.

Value driver here	What buyers pay for	Where sellers lose money
Water frontage type	Dollar Bay or open-bay view, canal frontage, wetland view, interior	Pricing an interior lot off a bay-view sale two streets over
Bulkhead and dock	Condition, age, permitted status, lift capacity	No documentation, so the buyer discounts for the worst case
Elevation and slab	On-grade behind the levee, not the stilt houses buyers expect on the coast	Failing to explain why this address is different
Insurance profile	Actual windstorm and flood quotes, not assumptions	Letting the buyer's agent guess, which always guesses high
Build year and finish	Median year built is 2016, so dated finishes stand out fast	Skipping cosmetic prep in a newer-inventory neighborhood

Gather your bulkhead records, survey, elevation certificate, and last twelve months of insurance declarations before the sign goes in the yard. A buyer who can price the carrying cost on day one does not need a price reduction on day forty.

The levee question, handled honestly

Grand Cay Harbour's biggest selling point is the one most agents fumble. The community sits behind the Texas City-La Marque Hurricane Flood Protection Levee, a 23-foot system completed in 1987, with a large tide gate beside the development that closes ahead of a storm. The developer markets the site as one where flood insurance is not required and homes have not flooded, including through Hurricane Ike in 2008.

Here is the part that protects your sale. Those are the developer's claims and the levee's public record, not a promise covering every lot, lender, and carrier. Flood insurance requirements are set by the buyer's lender from the current FEMA map for that exact parcel. Say "you do not need flood insurance here," be wrong on one lot, and you have handed the buyer a renegotiation. Hand over the map panel, the levee documentation, and a real carrier quote instead, and you have handed them a reason to pay more.

What the numbers say right now

Public neighborhood data shows a median market value near $563,000, a median sold price around $217 per square foot, a median home size near 2,385 square feet, and a value band of roughly $471,000 to $687,000. New construction here starts around $404,990 for plans of 1,839 to 2,604 square feet.

Signal	Grand Cay Harbour	What it means for your listing
Median market value	About $563,000	Top tier of Texas City pricing, so expect a slower, more selective buyer pool
Median sold price per square foot	About $217	Well above the Texas City norm, driven by water, not finishes alone
Active listings	Roughly 11 of about 160 homes	Thin inventory helps you, but one badly priced comp sets the tone for the street
New construction floor	From about $404,990	Your resale must beat a brand-new home on lot, view, or landscaping
Galveston County median days on market	64 days, May 2026	Plan for two months of exposure, not two weeks

Competing against a builder in your own neighborhood is the most underrated challenge here. A buyer touring your home can drive four minutes to a model with a warranty and a rate buydown. You win on what a builder cannot sell: an established lot, mature landscaping, a finished backyard, a built bulkhead, and a closing date the buyer controls.

Comparing listing agents without falling for a billboard

Type of agent	Good at	Risk on a waterfront resale
High-volume production teams	Speed, systems, lead routing	Your file may go to whoever is free, not a waterfront specialist
Discount and flat-fee brands	Lower headline commission	Marketing depth and negotiation time get cut first
Solo neighborhood agents	Street-level knowledge	Bench depth when the agent is unavailable
The Mandie McMillan Team	Coastal pricing, 75 sides and $22,127,458 in 2025 production across 6 agents	Ask every team who personally handles your file from list to close

Competitor descriptions reflect general specialty and public directory information, which can change. Compare agents on the plan, not the fee, because the lowest fee is not the highest net. A listing that sits ninety days and sells after two reductions costs more than a full commission ever did.

Why the Mandie McMillan Team fits a Grand Cay Harbour sale

Mandie McMillan was born and raised in La Marque, the town on the other end of the same levee system that protects your neighborhood, and has lived in Galveston County for 50 years. She serves as Chair of the Texas City-La Marque Chamber of Commerce after four years on its executive board, so the person listing your home is invested in this city's economic future, not just your closing date. She is a RE/MAX International Hall of Fame inductee, a repeat RE/MAX Chairman's Club and Platinum Club honoree, holds the SRS and CLHS designations, and has 26 years in the business.

In 2025 the team closed 75 sides and $22,127,458 in production with just 6 producing agents, roughly 12.5 sides and $3.7 million each. That is depth, not headcount. You get an agent who knows your file, your bulkhead, and your levee documentation, backed by the Rising Tide roster, working as a Client for Life advisor with a zero-hiccup process from contract to keys. Contact The Mandie McMillan Team at RE/MAX Coastal for a listing analysis built on your lot, your water, and your insurance profile.