Plano is a resale market, and the arithmetic is not close
Start with the number that settles the argument. In calendar year 2022 the City of Plano issued residential permits for 2,550 units. Forty-nine of them were single-family detached houses, against a standing stock of 70,355 — roughly one new house for every fourteen hundred that already exist. Nearly all new residential product is multifamily, townhome, mid-rise or senior living, in redevelopment districts.
The reason is that the city ran out of room. The last major annexation was in 2003; Plano occupies 71.69 square miles, is ringed by other municipalities and cannot expand. As of 1 January 2023 the Planning Department counted roughly 2,060 acres of undeveloped land, about 4.5% of the city, fewer than 400 acres of it anticipated for residential use.
So the practical position is simple: a buyer here is almost certainly buying a resale. There is no builder to call back and no builder warranty running.
The build-era profile, and what each band predicts
The American Community Survey's 2020–2024 five-year estimates put Plano's housing stock at 117,686 units, with a median year built of 1993 — so the typical Plano house is about thirty-three years old.
| Year built | Units | Share |
|---|---|---|
| 2020 or later | 2,078 | 1.8% |
| 2010–2019 | 14,100 | 12.0% |
| 2000–2009 | 20,689 | 17.6% |
| 1990–1999 | 33,707 | 28.6% |
| 1980–1989 | 25,450 | 21.6% |
| 1970–1979 | 16,250 | 13.8% |
| 1960–1969 | 3,718 | 3.2% |
| 1959 or earlier | 1,694 | 1.4% |
Just over half the city — 50.3%, or 59,157 units — was built in the two decades from 1980 to 1999. Roughly 69% predates 2000, fewer than one in five homes predates 1980, and only 1.4% predates 1960. Plano is not an old-housing market in the north-eastern sense but a mature late-twentieth-century suburban one.
The City's Heritage Preservation Plan documents the direction: Central Expressway opened in 1958, new homes spread first east of town in Old Towne and Briarwood, then transitioned west, accelerating after 1979. What the City does not publish is a build decade for any named subdivision — that has to be established parcel by parcel from appraisal records.
One era band is date-bounded rather than impressionistic: aluminium branch-circuit wiring was installed primarily from 1965 to the mid-1970s, and homes built before 1965 are unlikely to have it. Plano's 1970s band is 13.8% of the stock. The City's own definition of an older home is thirty years or older, which in 2026 is about 65% of Plano.
There is effectively no condominium market
Condominium is a form of ownership, not a structure type, so isolating it in census data means crossing tenure against units in structure. Owner-occupied units in structures of two or more units total 745 — 1.2% of owner-occupied units, and 0.6% of all housing in the city. Of 64,016 owner-occupied units, 59,955 are detached houses: 93.7%. Another 2,837 are attached single-family townhomes. A buyer looking at owner-occupied housing in Plano is a buyer of a house or a townhome, almost without exception.
The rental market is the mirror image, with 16,663 units in buildings of fifty or more. And roughly one in eight occupied detached houses in Plano is a rental, 8,617 of 68,572 — a tenanted house has a different maintenance history from an owner-occupied one.
Two counties, two appraisal districts, more than one school district
Plano lies in Collin and Denton counties. By the 2020 count the Collin County part held 112,664 housing units, 97.8% of the city; the Denton County part held 2,570 units, about 2.2%, and 5,534 people, on the western and north-western edge. For those homes the appraisal district, county tax office, deed records and county tax rate are all Denton County's. A buyer in that sliver who searches Collin CAD will find nothing at all.
School district boundaries do not follow the city limits either. Plano ISD covers about 100 square miles in south-west Collin County, of which 66 square miles are inside the City of Plano — against a city land area of 71.69 square miles, leaving roughly 8% of Plano outside Plano ISD. Lewisville ISD, a Denton County district, lists Plano among the municipalities it serves. A Plano mailing address does not guarantee a Plano ISD school, and attendance boundaries change.
Two terms are routinely conflated. A Public Improvement District levies an additional assessment on the owner; a Tax Increment Financing Reinvestment Zone is not an assessment and adds no line to a homeowner's bill. Tax Code §25.02(a) requires the appraisal record to identify each taxing unit in which a property is taxable, which settles it.
The option period is the container, and it is Paragraph 5.B
The option period is not created by any Texas statute; no law entitles a buyer to an inspection period. It is a negotiated provision of a promulgated contract form, currently TREC No. 20-18, One to Four Family Residential Contract (Resale), effective 3 January 2025, adopted by rule at 22 TAC §537.28.
It is Paragraph 5.B, not Paragraph 23. In TREC No. 20-18, Paragraph 5 is headed “EARNEST MONEY AND TERMINATION OPTION” and the termination option lives at 5.B. Paragraph 23 of the current form is “Consult an Attorney Before Signing.” The option language moved during the Paragraph 5 restructuring whose mandatory use began 1 April 2021. Most of the Texas real-estate internet still says Paragraph 23, and has been wrong for five years.
Under 5.B the buyer has the unrestricted right to terminate by giving notice within a blank number of days after the Effective Date — negotiated deal by deal, with no reliable published figure for a “typical” length. And 5.D is unforgiving: if no amount is stated as the option fee, or the buyer fails to deliver it in time, “Buyer shall not have the unrestricted right to terminate this contract.”
Paragraph 7.A carries two provisions that quietly consume days: the seller must cause existing utilities to be turned on and keep them on, since nobody can evaluate heating, cooling or plumbing at a house with the utilities off; and hydrostatic testing is carved out separately, requiring the seller's written authorisation.
Everything a buyer might research has to fit inside that window, and the tasks run in sequence rather than parallel: the general inspection first, because it generates the questions, then specialists with their own lead times. A permit records request is the only item whose turnaround is not under the buyer's control.
The seller's disclosure notice, and the exact shape of its limit
Texas Property Code §5.008 requires a seller of residential property of not more than one dwelling unit to deliver a written disclosure notice on or before the effective date of a binding contract; where it is not delivered in time, the statute provides that the purchaser may terminate for any reason within seven days after receiving it.
The form runs to ten numbered items. Item 4 includes previous structural or roof repair, and Item 9 asks whether the seller is aware of “room additions, structural modifications, or other alterations or repairs made without necessary permits or not in compliance with building codes in effect at that time.” Note the second half of that clause: the grandfathering principle is written into the disclosure form itself.
Then comes the limit, which is not a loophole but the design of the statute. The form warns in capitals that the notice is a disclosure of the seller's knowledge as of the date signed and is not a substitute for any inspections or warranties. And §5.008(d) states that if the information is unknown to the seller, the seller shall indicate that fact and by that act is in compliance with this section.
Read carefully, that subsection is the whole matter. The standard is the seller's knowledge, not the condition of the house. A notice with a column of “unknown” boxes is fully compliant, and a seller unaware that a prior owner's addition was unpermitted answers Item 9 truthfully.
Certain transfers are exempt altogether, including foreclosure sales, sales by a fiduciary administering an estate, and a new residence that has not previously been occupied — so the houses most likely to carry unrecorded work are the ones most likely to arrive with no notice. Statutory text: Texas Property Code ch. 5.
The clay, and why it is structural rather than incidental
Plano sits on the Blackland Prairie. Its soils are not transported; they weathered in place out of Upper Cretaceous marine marl and calcareous mudstone, which is why they behave as they do.
The bedrock runs Eagle Ford shale at depth — 200 to 300 feet thick in the Dallas–Fort Worth area — then the Austin Chalk, then the Ozan Formation at the base of the Taylor Group, a calcareous marl that USGS describes as montmorillonitic and maps in Collin County. Montmorillonite is the smectite mineral that drives shrink-swell. The bedrock is the reason the dirt moves, and which unit sits under a given lot varies.
The resulting soil series are named and classified, and the classifications are not rhetorical. Houston Black — the Texas state soil and the dominant soil of Collin County — is a fine, smectitic, thermic Udic Haplustert: a Vertisol, a shrink-swell soil by taxonomy rather than reputation. Its Official Series Description records high shrink-swell potential, very slow permeability, and cracks that remain open for 90 to 150 cumulative days in most years. Heiden is also a Vertisol with the same crack season; Ferris holds the steeper ground and its cracks stay open 120 to 150 days a year.
The mechanism sits in one line of that description: “Water enters the soil rapidly when it is dry and cracked, and very slowly when it is moist.” Water races down open cracks to depth, the clay swells shut, and the profile stops accepting water. That is why the first heavy rain after a drought produces sudden movement, and why the damage is differential.
There is an exception. Austin is a fine-silty, carbonatic, thermic Udorthentic Haplustoll — a Mollisol, not a Vertisol — weathered from chalk, with moderately slow permeability and no high-shrink-swell statement in its series description at all. Where the chalk is near the surface the hazard is materially lower, so two Plano houses a mile apart can sit on different ground (Houston Black series description).
The City's response is written into its ordinance. Plano's amendment to IRC R401.2 requires that every foundation and footing, and any size addition to an existing post-tension foundation, be designed and sealed by a Texas-registered engineer, with no size threshold. So a house with a foundation-repair permit has an engineer-sealed plan on file. A house with visible pier caps and no permit does not.
Roofs, hail, and what the record can settle
Roof age is the question buyers ask most often about a Plano house, and the permit record answers it only partly. NOAA storm reports for Collin County from 1996 to 2026 record 538 hail reports: 65 at two inches or larger, eight between three and four inches, and three at four inches or more, the largest a 5.25-inch stone on 11 April 2016.
Plano requires a permit for roof replacement, with one threshold that decides whether a missing record means anything: re-roof work not exceeding 25% of the roof does not require a permit. A patched slope can legitimately sit below that line; a full tear-off cannot.
What the permit proves is narrower than buyers assume. Plano publishes exactly two re-roof inspections. A partial final checks underlayment, but only on metal panel, metal shingle, and concrete and clay tile roofs — so on the composition-shingle roofs covering most of the city there is no city inspection of decking or underlayment before the shingles go down. The final verifies installation and includes an attic check.
And the final can be certified away. Plano publishes a homeowner certification form — FM624RY003a, revised 7 November 2019 — on which the homeowner certifies that the roofing contractor performed that attic inspection. A finaled Plano re-roof permit therefore does not establish that a city inspector was ever in that attic. The governing handout is dated 2016 and still cites the 2015 code cycle, so whether the practice survives unchanged under the 2024 IRC is a question for Building Inspections.
That is the habit worth carrying into any Plano purchase: work out what a permit's inspections covered, and treat everything outside them as unexamined.
Common questions
How old is the typical house in Plano?
The median year built is 1993, per the American Community Survey's 2020–2024 five-year estimates, so the typical Plano house is around thirty-three years old in 2026. Just over half the stock — 50.3%, or 59,157 units — was built between 1980 and 1999. Roughly 69% predates 2000, fewer than one in five homes predates 1980, and only 1.4% predates 1960.
Are there many new houses being built in Plano?
Very few detached ones. In 2022 the city permitted 2,550 residential units, of which 49 were single-family detached, against a standing stock of 70,355 detached houses. The last major annexation was in 2003, and roughly 2,060 acres of undeveloped land remained as of January 2023, fewer than 400 anticipated for residential use. New residential product is overwhelmingly multifamily, townhome and mid-rise in redevelopment districts.
Are there condos in Plano?
Almost none, in ownership terms. Owner-occupied units in structures of two or more units total 745 — 1.2% of owner-occupied units and 0.6% of all housing in the city. Of owner-occupied units, 93.7% are detached houses and another 4.4% are attached single-family townhomes. The large multi-unit stock in Plano is overwhelmingly rental: 16,663 units sit in buildings of fifty or more.
Which paragraph of the TREC contract is the option period?
Paragraph 5.B of TREC No. 20-18, the One to Four Family Residential Contract (Resale) effective 3 January 2025. Paragraph 5 is headed “EARNEST MONEY AND TERMINATION OPTION.” Paragraph 23 of the current form is “Consult an Attorney Before Signing.” The option language moved during the Paragraph 5 restructuring whose mandatory use began 1 April 2021, and a great deal of published Texas real-estate content still cites the old numbering.
Does the Texas seller's disclosure tell a buyer whether work was permitted?
It asks the question. Item 9 of the Property Code §5.008 form asks whether the seller is aware of room additions, structural modifications or other alterations or repairs made without necessary permits or not in compliance with building codes in effect at that time. But §5.008(d) makes the standard the seller's knowledge: where the information is unknown to the seller, indicating that fact is full compliance with the statute.
Why do Plano houses have foundation problems?
The dominant upland soils — Houston Black, Heiden and Ferris — are smectitic Vertisols weathered in place from Upper Cretaceous marl and mudstone, with high shrink-swell potential, very slow permeability, and cracks that stay open 90 to 150 days a year, and 120 to 150 for Ferris. Water races down open cracks when the soil is dry and is refused once the clay swells shut, which produces uneven seasonal movement. The Austin series, weathered from chalk, is the exception and carries no high-shrink-swell statement.
Is all of Plano in Collin County?
No. About 97.8% of the city's housing units are in Collin County and roughly 2.2% — some 2,570 units and 5,534 people by the 2020 count — are in Denton County, on the western and north-western edge. For those homes the appraisal district, county tax office and deed records are Denton County's. School district boundaries also cross the city: Plano ISD covers 66 of Plano's 71.69 square miles, and a Plano address does not guarantee a Plano ISD school.