Selling a Home in Westlake Hills: The Paper Gaps That Are Costing 2026 Sellers More Than Price
July 9, 2026
July 9, 2026
The Westlake Hills market in 2026 is not the market most owners remember from their purchase. Eanes ISD-area inventory sits at roughly 11.6 months of supply as of spring 2026, with homes closing at about 90.83% of list price and a median around $1.895M according to Orchard's West Lake Hills housing report. Homes are still moving, but selectively, and buyers have leverage they have not held in a decade.
Here is the shift most sellers miss: in this market, the friction has moved from the bidding table to the option period. Sellers who lose money in 2026 are rarely losing it on the sticker. They are losing it on the paperwork gaps that surface once a buyer's inspector, appraiser, and lender start pulling on threads. In 78746, those threads have local names: septic, impervious cover, and drainage.
Look past the headline median. In the Eanes ISD zone, the median sale price over the last 30 days sat at $1,375,000, down 5.3% year over year, with 91 new listings and a median 56 days on market according to Orchard's Eanes ISD dashboard. Roughly 44% of active listings have taken a price cut, and only about 15% closed above list.
That is a buyer's market at the entry tier, a balanced market in the $2.5M to $5M range where finished, move-in-ready inventory still moves quickly per local practitioners tracking the corridor, and a genuinely thin ceiling above $5M where Rob Roy and Barton Creek estates trade lot by lot rather than on comps. The Keenan Group has publicly cited 140 active listings and 336 trailing-twelve-month closed sales in Westlake Hills proper, which puts real numbers on how narrow that estate lane has become.
The interpretation matters more than the numbers. When a buyer has 140 alternatives, condition and cleanliness of file are the deciding factors after price. That is the thesis of this piece.
West Lake Hills is one of the very few affluent Austin-area municipalities where the majority of homes are on private on-site sewage facilities rather than centralized sewer. That single fact drives more late-stage transaction friction than any finish-out decision a seller will make.
Two disclosure documents come into play under Texas Property Code §5.008: the standard Seller's Disclosure Notice (TREC OP-H) and the separate Information About On-Site Sewer Facility form (TXR 1407), which asks for system type, approximate age, and maintenance history. Both are the seller's to complete, not the agent's. A clean OP-H paired with a blank or vague 1407 is one of the most common reasons Westlake deals go back for renegotiation during the option period.
The pump-out interval is where sellers most often discover they are behind. Under West Lake Hills Ordinance 2020-018, residential septic systems must be pumped and inspected on this schedule:
| System location | Required pump interval |
|---|---|
| Inside the Edwards Aquifer Recharge Zone | Every 3 years |
| Outside the Recharge Zone (within city limits) | Every 7 years |
The city requires that a copy of the pumping company's invoice be furnished, per the on-site sewage facility rules published on westlakehills.gov. A missing invoice will not stop a sale, but it will invite a buyer to ask for a full pump, inspection, and, in some cases, a lift-station or drain-field workup as a condition of closing. On aerobic systems that have not been maintained since the last owner, that is a five-figure conversation.
Two practical notes for sellers. First, LCRA has resale inspection authority for systems within roughly 2,000 feet of Lake Travis, so waterfront and near-lake homes carry an additional layer that must be scheduled well before closing. Second, FHA and VA appraisers are directed to flag visible signs of septic failure, and unresolved flags require repairs before funding. Conventional lenders may follow suit if the appraiser calls it out. None of this is unusual in Texas, but it is unusual in a $2M price bracket, which is where out-of-state buyers first encounter it.
The other paper gap unique to 78746 is impervious cover. Single-family lots of half an acre or larger in West Lake Hills are capped at 25% impervious cover per Article 22.03, Division 8 of the city's Code of Ordinances, confirmed on the city's building FAQ. Roofs, driveways, pool shells, decking on compacted base, and most patios all count toward the cap.
Two things changed in 2026 that sellers need to understand. On April 8, 2026, the West Lake Hills City Council approved a revised Drainage and Erosion Control Design Manual, applicable to projects submitted for review beginning May 18, 2026, per the city's Building & Development page. The revisions touched impervious cover definitions, residential project classification, and design criteria. Any pool, addition, or hardscape project a buyer is considering post-close will now be reviewed under the new manual.
Why does this matter at listing? Because sophisticated buyers, especially relocating professionals and their agents, are now running an impervious cover calculation before writing. If the listing markets a "future pool site" or a "guest casita opportunity" and the lot is already at 23% coverage, the buyer's assumption about the property's flex has just collapsed. Sellers who can hand a buyer a current survey with impervious cover mapped and a remaining allowance calculated remove that objection before it forms.
The city also publishes a Drainage Manual and requires drainage plans with building permit applications, reviewed by the City Engineer's office. If your home has an addition, pool, or major hardscape installed by a previous owner without a clear permit trail through the city's MGO Connect portal, that is worth resolving before you list.
The Westlake corridor is not one market. Practitioners in the area consistently describe at least three:
Entry tier, roughly $900K to $1.4M in the broader Eanes zone, $1.5M to $2M in West Lake Hills proper. These homes still see multiple offers when priced correctly, particularly in Lost Creek and Rob Roy. Concessions are rare. This is where a well-prepped septic file and clean impervious math produce measurable dollars.
Mid tier, $2.5M to $5M. This is where days on market stretch to 30 to 60 for anything off on price or condition. Renovated, move-in-ready homes in this band do not sit. Original 1970s to 1990s builds needing systems work absolutely do.
Estate tier, $5M and up. Barton Creek, Rob Roy, and the ridge lots. These trade on view, lot, and story more than comps. Volume in 78746 skewed heavily to sales above $1.4M in early 2026, which tells you the top of the market is where the real activity has held, but it also means each individual home has to earn its buyer.
Winter Water Averaging, the West Lake Hills utility calculation used to set summer wastewater billing, runs December 3, 2025 through March 3, 2026 per the city's wastewater page. Sellers who list in the shoulder months should be prepared to explain the utility numbers a buyer sees on the disclosure, which are shaped by that averaging window.
For owners planning a 2026 listing, the order matters:
Do I have to inspect my septic before listing in West Lake Hills? Texas does not require a pre-listing septic inspection statewide, but West Lake Hills requires documented pumping on the 3-year or 7-year interval depending on the Edwards Aquifer Recharge Zone. A buyer's lender may require an inspection regardless.
Does the new Drainage and Erosion Control Manual affect my current home? It applies to projects submitted for review starting May 18, 2026. Your existing structures are not retroactively subject, but any buyer planning a future pool, addition, or major hardscape will be reviewed under the new manual, which affects how they underwrite your property.
How do I find out my impervious cover percentage? Start with your survey and a site plan. The city administers calculations under Article 22.03, Division 8 of the Code of Ordinances, and Development Services staff, including Director Jennifer Bills, can confirm how coverage is measured for your specific lot.
Selling in Westlake Hills in 2026 rewards preparation over polish. The homes that close cleanly at strong numbers this year are the ones whose sellers closed the paper gaps before a buyer's inspector had a chance to find them. If you are considering a listing in 78746 and want a candid read on where your property sits across septic, impervious cover, and pricing tier, Liz King works with a small number of Westlake sellers each season. Schedule a consultation to walk through your file before it becomes the buyer's leverage.
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