educational estimating tool - not professional advice. a scenario, not a prediction. read the full disclaimer.

dallas · oak lawn · thoroughfare plan, city layer

how much of your dallas lot does the thoroughfare plan take

dallas's thoroughfare plan sets a right-of-way width for most thoroughfares; some read existing right-of-way or a range. where one is narrower today, a lot that plats can be asked to dedicate a strip along its front, and its front yard is measured from the plan line either way. pick a neighborhood, then click a lot, or type an address, to see that strip.

this is a scenario, not a prediction. dedication of half the plan width from the centerline happens when a lot is platted (dallas development code 51a-8.602(c)(1)(b)), exactions must be roughly proportionate to the project (51a-1.109), the commission can waive it in a redeveloping area (51a-8.602(c)(3)), and the plan covers thoroughfares only, not the local street most lots sit on, so the build finds no plan frontage for most lots here. even without a plat, the front yard is measured from the plan line where that makes the greater setback (51a-4.401(a)(2)). widths here come from appraisal-district lot lines, not a survey, and dallas publishes no existing width to check them against. your survey, the plat and the city's review control.

scenario

neighborhood city neighborhood association area (oak lawn = planned development district 193)

which lots give up land every lot, as if each one redeveloped

find my lot, any neighborhood here type a street address, then pick it from the list

the lot you clicked

click a lot on the map, or find one by address, to see its streets, the widths and the strip drawn on the lot.

neighborhood totals

hyde park, private lots	(a) full width	(b) triggering lots only

neighborhood by neighborhood

neighborhood	private lots	(a) share of private land taken	(b) share taken	(a) lots losing over 10%	(b) lots losing over 10%

the cap and the waiver

the amount. along a thoroughfare at the edge of a plat, enough must be dedicated to provide one-half of the plan requirement, measured from the centerline of the existing right-of-way (51a-8.602(c)(1)(b)). more can apply: if the plat takes in both sides, the entire requirement (51a-8.602(c)(1)(d)); if the opposite side is railroad, a utility or floodway easement, or otherwise undesirable, the commission may require a correspondingly greater dedication (51a-8.602(c)(1)(b)). corner clips (51a-8.602(d)) are not modeled here.

the cap. dedications are apportioned under 51a-1.109 (51a-8.602(b)). no exaction may be imposed unless it is related to the needs the project creates and roughly proportionate to its impact (51a-1.109(a)(1)). a city-retained engineer makes the apportionment (51a-1.109(e)(2)), and a developer may appeal it to the city plan commission (51a-1.109(f)). the full strip on this page is not the amount a given project would owe.

the waiver. on property already platted with improvements built and accepted, the commission may waive additional right-of-way for existing streets if no minor-street realignment or zoning change is proposed, the street has its required lanes and the full width is not warranted, the director and chief planning officer recommend it, and the area is found to be redeveloping (51a-8.602(c)(3)).

what triggers it. platting: the code puts the dedication on the owner of the property to be platted (51a-8.602(a)). separately, the front yard is measured from the plan's required right-of-way or the front lot line, whichever makes the greater setback (51a-4.401(a)(2)). scenario (b) leaves out single-family r and duplex d(a) zoning on this page's own assumption that a house on an already platted lot needs no new plat; that is not a code citation. inside a planned development, this page does not read the district's own rules.

method

boundary. the city's neighborhood association polygon, used whole; oak lawn is the planned development district 193 polygon from the city's zoning layer. a lot is in if its centre point is.
lots. dallas central appraisal district parcels as the city publishes them; stacked condominium copies counted once. fully exempt accounts are left out, using the full-exemption flag in the city's 2022 parcel extract, the only one published with an account key. "private" means every other parcel. the limits: the flag is 2022 data, an account created or sold since then is not reflected, and it marks churches and nonprofits as well as public bodies, so some private owners are left out and some public parcels may remain.
required width. the right-of-way figure in each plan segment's description (100' row reads 100 ft). segments with a range (60'-80' row) or marked existing row are not counted.
today's width. measured on a line square to the lot's street edge, from the lot line through the street centerline to the first lot line across the street (median of three samples along the edge). a thin strip parcel between the lot and the street (15 ft or less on that line, long, with 20 ft or more of open street beyond it) is read through, and the width still runs from the lot's own line; any other parcel in between means no frontage. where no lot line is found across, twice the distance to the mapped centerline is used as an estimate, not a measurement, and the lot says so; in spot checks that estimate missed the lot-line width by up to 30 ft. a width still under 20 ft reads "not measured" and carries no strip. dallas publishes no existing-width figure, so these widths have no independent check.
the strip. per side = (required - today) ÷ 2, from each side's own lot line: the development code asks a plat along a thoroughfare for one-half of the plan requirement measured from the centerline of the existing right-of-way (51a-8.602(c)(1)(b)). this assumes that centerline is midway between the lot lines. the strip is clipped out of the lot line exactly, and corner overlaps are counted once. a strip under 1 ft is inside lot-line error; those lots are counted separately in the totals.
no buildable footprint. the yard rules differ by district and by planned development, and this page does not apply them per lot, so no footprint is drawn. the dallas lot rules page reads the yards back for a district you pick, with the thoroughfare line as an input.
which neighborhoods. inner neighborhoods where the plan's widenings cross existing lots. an area is published only if it passes the data checks: at least 200 private lots, at least 30 lots on a plan street, and no more than 25% of frontages with no lot line found across the street.

sources

the other half of the question. this page shows what a lot could give up. what the same lot can now hold is what a dallas residential lot allows: run the lot there with the front of the lot moved back by the strip shown here.