The Highland Park Height Limit That Changes Depending on Where You're Standing

Highland Park's zoning ordinance says 25 to 26 feet, depending on the district. That number shows up on builder websites, in listing descriptions, in every generic guide to buying and rebuilding in the Park Cities. What almost none of them mention is that the ordinance doesn't measure height from the street, from sea level, or from any fixed point at all. It measures from the adjacent ground at each specific section of the house. On a flat lot, that distinction never comes up. On a sloped one, it can quietly take three or four feet off what a buyer assumed they were allowed to build, and the only way to find out is to read the Board of Adjustment's actual case files, not the ordinance summary.

This matters because Highland Park is, by its own zoning code's description, "a mature and completely developed residential community" of single-family homes. There is no raw land left to build on. Nearly every new construction project starts as a teardown, which means nearly every new construction project inherits whatever grade the previous house sat on for eighty or ninety years. That grade, not the headline number in the ordinance, is what actually caps your build.

The Line in the Ordinance Most People Skip

Section 8-601(1) of the town's zoning ordinance sets the baseline: within 40 feet of the rear property line, a structure in the B, C, D, E, and F districts cannot exceed 25 feet in height, and the top plate cannot exceed 12 feet 6 inches. Read quickly, that sounds like a fixed ceiling. It isn't. The ordinance defines height as feet above adjacent ground, and adjacent ground is whatever elevation exists at that specific point on the lot, not a single number for the whole property.

That single word, adjacent, is where the Board of Adjustment spends most of its time.

A 3.5-Foot Slope Cut One Lot's Buildable Height Nearly in Half

A case that came before the Board shows exactly how this plays out. The lot in question slopes upward from front to back. From the front setback, where the ordinance establishes its measuring point, to the proposed rear wall of the house, the ground rises 3.5 feet. Because the height limit resets at each point along the structure, that rise meant the top plate at the rear of the house was only permitted to reach 9 feet above the adjacent ground there, not the standard 12.5 feet. The overall structure height at that section was capped at 21.5 feet. With the ground elevation at 518 feet above mean sea level at the rear 40 feet of the lot, even a flat roof design topped out at 23.5 feet, well under the ordinance's usual 26-foot maximum for flat roofs. Staff reviewed the case and recommended the variance be approved, precisely because the slope, not the design, was what created the shortfall.

Here's what that looks like side by side:

Nothing about this lot was unusual for Highland Park. A gentle rise from front to back is common across the town's older streets. The buyer only found out about the gap between "what the ordinance says" and "what this lot allows" once an architect ran the actual grade survey against the plans.

The Katy Trail Case Runs the Other Direction

Slope doesn't always work against a buyer. A separate case on St. Johns Avenue involved a property backing up to the Dallas city limit and the Katy Trail, where the opposite side of the trail includes commercial buildings and apartments, some several stories tall. The owner requested a variance to let a flat roof extend 1.5 feet above the standard 26-foot maximum, plus additional relief under Section 8-601(1) to build 2.5 feet above the rear-yard height and top plate limits. The justification wasn't the lot's own grade. It was the context next door: a taller structure across the trail changed what "compatible with the neighborhood" reasonably meant on that specific block.

The lesson isn't that every lot near the trail gets extra height, or that every sloped lot loses it. It's that the ordinance's flat numbers are a starting point the Board treats as negotiable in either direction, based on facts specific to that address. A buyer comparing two lots on paper, both zoned the same, both listed with the same "25 ft height limit" note, could be looking at meaningfully different buildable envelopes once grade and adjacent land use are factored in.

What the Board Actually Has to Find

Highland Park's Board of Adjustment is five members and two alternates, appointed by the mayor and confirmed by the town council for two-year terms. State law requires a public hearing before the Board can grant a variance, and every case file follows the same four-part test:

1. Special conditions. Is there something inherent to this specific property, like the slope or the adjacent land use, that creates the problem?
2. Unnecessary hardship. Would strict enforcement of the ordinance, without a variance, create a hardship beyond what the ordinance intends?
3. Contrary to public interest. Would granting the variance harm the neighborhood or violate the ordinance's broader purpose?
4. Spirit of the ordinance. Does the request stay within what the ordinance is actually trying to accomplish, even if it departs from the literal number?

Every agenda item the Board hears gets evaluated against those same four questions, whether the request is for three feet of extra height or a ten-foot fence.

Neighbors Get a Say Before You Ever Reach the Podium

The town's own zoning guidance recommends contacting neighbors within roughly 200 feet of the property during conceptual design, before the formal application even goes in. That's not a courtesy. It shapes the record the Board reviews. In one fence variance case on Armstrong Avenue, the town received six letters of support and none in opposition, and staff noted five other properties had previously been granted similar relief. In a separate second-story addition case, no letters arrived either way. The presence or absence of neighbor input becomes part of the hearing itself, not background noise.

There's also a category of variance that has nothing to do with height or setbacks and everything to do with definitions. A case involving a property on Highland Drive turned on how the ordinance defines a cellar: a story with more than half its height below the average adjoining grade doesn't count as a story for height-calculation purposes. The owners wanted a below-grade level with two different elevations, one 12 feet below the finished first floor and another 18 feet below. Whether that space counted as a cellar or a full story determined whether the design even needed a variance in the first place.

What This Means If You're Under Contract on a Teardown Lot

If you're buying a Highland Park property to rebuild, the ordinance number your agent or builder quotes is a starting assumption, not a guarantee. Before you finalize architectural plans:

• Get a topographic survey early, not after the design is drawn. Grade differential between the front setback and the rear of the lot is exactly what determined the outcome in the slope case above.
• Ask what's across the property line, especially if the lot backs to a trail, alley, or non-residential use. Context can work in a buyer's favor, as it did on St. Johns Avenue, but only if it's documented in the application.
• Build variance timing into your schedule. A public hearing requires notice, and the process assumes weeks, not days, between application and decision.
• Talk to adjacent property owners before you file. The record shows the Board pays attention to whether neighbors wrote in, and in which direction.

A Few Questions Worth Asking Before You Sign

Does every rebuild in Highland Park need a variance? No. Most projects that stay within the flat-lot assumptions of the ordinance never go before the Board. Variances come up when the specific lot, its grade, or its neighbors create a condition the ordinance's flat numbers didn't anticipate.

Who reviews the survey and plans before a variance application goes in? The town's Building Inspection Department reviews plans against the zoning ordinance as part of the standard permit process. A variance becomes necessary only when that review turns up a conflict the applicant wants relief from.

Can a neighbor block a project just by objecting? Objection letters become part of the record the Board weighs against the four-part test, but the ordinance doesn't give any single neighbor veto power. The Board's decision has to rest on the special-condition, hardship, public-interest, and spirit-of-the-ordinance findings, not on the volume of letters alone.

Every lot in Highland Park carries its own grade, its own setbacks, and its own history with the town's Building Inspection Department. Before you write an offer on a teardown candidate, it's worth having someone pull that history and walk the lot with you.

Christi Weinstein works with buyers and current owners across Highland Park who are weighing a rebuild against a sale as-is. If you already own a lot here and want to know what it could support, or what it's worth to a builder as it stands, request your free home valuation and we'll help you sort out which path actually pencils.