Why 78746 Doesn't Trade Like One Market
A relocation buyer opens the tab, sees a trailing-twelve-month median of about $2.05M in 78746 as of late June 2026, and assumes the ZIP tells them what to expect. It does not. Two houses of similar size, one street apart, can settle six figures apart because the ZIP contains three separate governments, two utility regimes, and one school district whose feeder lines refuse to follow any of them.
The thesis is simple. In 78746, price is a function of lot buildability and jurisdiction more than square footage. The median hides the mechanism.
The Keenan Luxury Market Index, drawn from MLS data over a trailing twenty-four months as of Q2 2026, puts Rollingwood at roughly $897 per square foot and West Lake Hills at roughly $655. That is counterintuitive if you have only read total-price medians, which run near $1.8M in Rollingwood and $2.4M in West Lake Hills for Q1 2026.
The two numbers tell different stories. West Lake Hills carries the higher ceiling because it holds the estate lots, the view parcels, and the acreage. Rollingwood carries the higher per-foot because its compact, sewer-served blocks are being torn down and rebuilt at scale, and every new-construction sale drags the average up. If you are buying square footage, Rollingwood is more expensive. If you are buying land, West Lake Hills is.
Rollingwood, West Lake Hills, and unincorporated Travis County pockets all share 78746 and Eanes ISD. They do not share development rules. That is the friction that catches relocation buyers who assume "78746" is a single market.
| Feature | Rollingwood | West Lake Hills | Unincorporated pockets |
|---|---|---|---|
| Q1 2026 median | ~$1.8M | ~$2.4M | Varies by tract |
| Wastewater | Municipal sewer typical | Septic common outside sewer footprint | Almost entirely septic |
| Terrain | Flat, predictable | Hilly, view-driven | Variable, often steep |
| Typical lot | Compact, walkable blocks | Half-acre to multi-acre | One acre and up |
| Permit path | City of Rollingwood | City of West Lake Hills, ZAPCO review | Travis County |
The sewer question is not cosmetic. It shapes what you can build, how long the permit takes, and what happens when the system fails.
Read the West Lake Hills municipal code closely and one line does most of the work: no on-site sewage facility for a single-family residence may be installed on a lot smaller than one acre unless the lot was legally platted before May 5, 1970, or sits under a narrow set of grandfathered conditions. On lots inside the Edwards Aquifer Recharge Zone the rule is stricter still.
That single ordinance explains why a half-acre lot in one part of the city is a knockdown-rebuild candidate and a half-acre lot two streets away is not. If the original 1960s home is on a pre-1970 plat, the septic footprint is a grandfathered asset that transfers with title. If the parcel was reconfigured later, you may be buying a house that legally cannot be replaced at anything close to its current size.
Layer on the dimensional and site rules: setbacks that widen on steep slopes, a slope threshold above which non-residential development is prohibited outright, single-driveway rules capped at twenty feet of width, and a required tree and vegetation inventory before any permit issues. The City's own Building and Development page confirms that after an application is deemed administratively complete, first-round comments can take up to four weeks, and variance cases route through ZAPCO before Council or the Board of Adjustment. Larger reconstructions routinely run several months. A variance can add two to three more.
None of this is visible in a portal listing. All of it is priced into what a builder will pay for the lot.
Every buyer in 78746 has been told about Eanes ISD. Fewer are told that the district boundary does not follow city limits, and neither do the elementary feeder zones inside the district. Crossing the Eanes line one street east of MoPac can drop comparable values by $200,000 to $400,000 on otherwise similar houses. Two houses on the same street inside Eanes can still feed to different elementary campuses. Verify a specific address on the district's official site before you write an offer, not after.
The practical read: a house's school assignment is a separate line item from its ZIP and its city. Comparable sales that ignore feeder zone are not comparable.
New construction in West Lake Hills is rare because the buildable inventory is largely spoken for. The most-watched pipeline right now is The Overlook at Westlake, a MileStone Community Builders project of 48 homes priced from about $2.85M to $5M with move-ins anticipated in late 2026. It matters less as a price signal than as a supply signal. When a builder assembles enough contiguous, buildable land inside the city to plat 48 homes, that is a decade of undeveloped inventory clearing at once. What comes after it will be smaller infill and teardown-rebuilds constrained by the ordinances above.
Rollingwood tells the opposite story. Its 2018-and-later builds on flat, sewer-served lots produce a steady stream of new-construction comps in the $2M to $4M range, which is why the per-foot number keeps climbing while the total-price median stays under West Lake Hills'.
Work the lot before you work the finish level. The questions that actually move value here:
A luxury seller in 78746 who has never priced these variables tends to leave money on the table by benchmarking against the wrong comps. A buyer who has not asked them tends to overpay for a house whose lot cannot support the home they actually want.
Why does Rollingwood cost more per square foot than West Lake Hills if the medians say otherwise? Because per-foot and total-price answer different questions. Rollingwood's housing stock is smaller, flatter, and being rebuilt aggressively, which lifts the per-foot number. West Lake Hills carries the estate lots and view parcels, which lifts the ceiling on total price. The two cities feed the same high school and share the same ZIP, but the buyers are not identical.
How much does the Eanes ISD boundary actually move price? Comparable homes on either side of the district line have shown gaps of roughly $200,000 to $400,000 in recent market data. The boundary runs close to MoPac in places, so a single block can matter. Feeder-zone differences inside Eanes are smaller but real.
Is a septic house a worse buy than a sewer house? Not inherently. It is a different asset. On a legally grandfathered one-acre-plus lot with healthy soils and slope, septic is often a non-issue and the privacy that comes with the acreage is why the buyer is there. On a smaller lot outside the grandfathering window, the septic system can constrain any future rebuild, which affects long-term value. The answer is address-specific.
How long does a full rebuild permit take in West Lake Hills? Larger reconstructions and new builds commonly run several months from a complete application to permit issuance, with each review cycle spanning a few weeks. Projects requiring a variance add two to three months, sometimes longer, because they route through ZAPCO before Council or the Board of Adjustment. Sellers timing a rebuild-and-flip need to price this friction in.
Buying or selling inside 78746 rewards patience, and it rewards representation that has priced these variables before. If you are weighing a house in West Lake Hills, Rollingwood, or one of the unincorporated pockets and want a read on what the lot will actually support, Kumara Wilcoxon and her team advise quietly, close carefully, and know where the lines fall. Work With Kumara.
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