Plano, Texas

Foundation repair in Plano

Plano was built straight across the years Texas changed how it pours concrete slabs. Which side of that line your house falls on decides how the foundation fails, how it gets repaired and what that costs — and a surprising number of Plano homeowners do not know which they have.

Built across the changeover

Post-tension slabs arrived in Texas residential construction in the late 1970s and were effectively standard by the mid-1980s. Plano's growth lands directly on top of that transition: a town of roughly seventeen thousand people in 1970, past seventy thousand by 1980, and well over two hundred thousand by 2000.

The practical result is a city with both kinds of slab in quantity, and a rough geography to it. The older east side skews toward conventionally reinforced slabs with no cables in them at all. West Plano, built out later, is post-tension almost throughout. In between sits the stock built across the changeover, where the honest answer is that you cannot tell from the street.

Not a question about the soil

Plano sits on the same deep Blackland clay as the rest of east Collin County, and that part is not in doubt — the regional picture is on our Dallas–Fort Worth page. What varies across this city is not the ground. It is what was poured on top of it.

Why it matters which one you have

Two slabs over identical soil, experiencing identical movement, produce different symptoms and need different repairs.

Conventionally reinforced Post-tension
Roughly when Before the late 1970s Late 1970s onward
How it responds to movement Follows it and cracks Stays intact and tilts as a unit
What you notice first Stair-step cracking through brick Sloping floors, binding doors, no cracks
Interior pier access Straightforward — nothing to cut Cables must be located before coring
Where it tends to sit in Plano Older east side West Plano and later build-out

This is why two Plano neighbors can describe completely different problems and have exactly the same cause underneath. It is also why advice written for one kind of house can be actively unhelpful for the other — a crack hunt on a post-tension slab finds nothing and proves nothing.

Three ways a contractor reaches a support point Three cross-sections of a house on a slab. The first shows a pier installed from outside at the perimeter. The second shows an interior pier reached by cutting through the slab from inside the house. The third shows an interior pier reached by hand-digging a tunnel underneath the slab from outside. Route 1 Perimeter Dig outside, press, backfill Machine access. Fastest and cheapest per support point. Route 2 Through the slab Cut a hole in the floor Flooring out, concrete cut, patch after. Post-tension cables must be located first. Route 3 Tunnel underneath hand-dug Dig in from outside, under the slab Interior untouched, but priced per linear foot of tunnel before any pier goes in.
A support point on the perimeter and the same support point in the middle of the house cost very different amounts, because of what it takes to reach it. This is the single biggest reason two quotes for one house can differ by a multiple — check whether both include interior work before comparing the totals.

The cost consequence lands on interior support points. On a post-tension slab the cables have to be located before anything is cored, and crews frequently prefer to tunnel in from outside rather than open the floor at all. On an older east Plano slab there is nothing in the concrete to avoid, and reaching an interior point is correspondingly simpler and cheaper. Our cost per pier page works through how much access drives the total.

How to find out which you have

Four checks, roughly in order of how little effort they take:

  1. Look at the garage slab edge. Post-tension slabs commonly carry a stamped warning or a small plate saying the slab contains tensioned cables and must not be cut. Often the fastest answer available.
  2. Check the year built on your Collin County appraisal record. Comfortably before the late 1970s or comfortably after the mid-1980s and you can be reasonably confident either way.
  3. Dig out the original construction documents if the house came with any, or ask a long-standing neighbor what their builder did.
  4. Have it scanned. A contractor or engineer can locate tendons directly. This is the only answer that is actually definitive, and it has to happen anyway before anyone cores the slab.

Texas's oldest post-tension slabs are here

Plano holds a substantial share of the earliest residential post-tension slabs in the state, and a good number are now past forty years old. That raises a question almost nowhere else in our coverage has to ask yet.

The documented long-term concern with post-tension slabs is corrosion at the tendon anchorages — the points at the slab edge where the cables are stressed and locked off. Unbonded tendons are greased and sheathed precisely to prevent this, so it is not a routine finding. It becomes possible where sheathing was damaged during construction, or where water has had persistent access to an anchorage over decades.

Keep it in proportion: this is something a structural engineer looks at on an older post-tension slab, not something to lose an evening over. But if your house is in that age bracket and an engineer is coming out anyway, it is a sensible question to put to them while they are there.

Permits

The City of Plano permits work inside its own limits, which covers almost all of what people mean by Plano, and foundation repair or underpinning normally requires one with engineered documentation. Collin County handles anything outside an incorporated city. The neighboring cities — Allen, Frisco, Richardson, Murphy and Wylie — each run their own, and boundaries here do not always follow mailing addresses or school district lines. Pulling the permit from the correct jurisdiction is the contractor's job.

Plano foundation repair costs

Clay-area pricing, with the additions that apply specifically to a post-tension house. General industry ranges, not quotes.

About these figures

Foundation Repair IQ does not quote prices and does not perform repairs. The figures below are general industry ranges published for orientation only — not quotes, not estimates for your property, and not binding on any contractor. Foundation pricing is set by the contractor after an on-site evaluation, and your actual cost may fall outside any range shown here.

Work General range Notes for a Plano house
Concrete pressed pilings $300 – $600 each The default on Blackland clay
Typical perimeter job $4,000 – $10,000 Commonly 8–20 support points
Steel push piers $1,200 – $1,900 each Deep clay or heavier two-story loads
Post-tension cable locating $300 – $900 Before any coring, on a west Plano slab
Tunneling for interior piers $150 – $250 per linear ft Often preferred over opening a post-tension slab
Elevation survey $300 – $800 The test when floors slope and nothing is cracked
Root barrier $1,500 – $5,000 Mature canopy in the older subdivisions
Hydrostatic plumbing test $250 – $600 Rule a leak in or out before committing
Engineer's evaluation $400 – $1,000 The opinion with nothing to sell you

Estimates for planning only. See the cost guide, slab repair costs, and cost per pier.

General information, not an assessment

This page describes how the two slab types common in Plano tend to behave. It is not a diagnosis of your home, and nothing here — the anchorage material especially — is a statement about your slab. A licensed contractor or a Texas-licensed professional engineer on site is the only way to know what your house is doing.

Plano foundation questions

Does my Plano house have a post-tension slab?

Genuinely worth checking rather than assuming, because Plano was built across the exact years the answer changed. Post-tension construction arrived in Texas residential building in the late 1970s and was effectively standard by the mid-1980s — and Plano went from a town of roughly seventeen thousand in 1970 to well over two hundred thousand by 2000. Houses on the older east side are frequently conventionally reinforced with no cables at all; houses in west Plano are almost certainly post-tension; and the stock built across the changeover could be either. The quickest checks are a tendon warning plate or stamp at the garage slab edge, the year built on your Collin County appraisal record, and the original construction documents if you have them. A contractor or engineer can scan the slab to confirm.

Why does it matter which kind of slab I have?

It changes how the foundation fails, how it is repaired, and what the repair costs. A conventionally reinforced slab has limited stiffness, so it follows ground movement and cracks — visible stair-step cracking through brick, cracks opening at door and window corners. A post-tension slab holds itself in compression and resists cracking, so it tends to tilt or dish as a rigid unit instead: noticeable sloping floors and binding doors with little or no visible cracking. Same soil, same movement, completely different symptoms, which is why two Plano neighbors can describe different problems and have the same cause. The repair differs too: any work that cores or breaks a post-tension slab requires the cables to be located first, which adds cost and a step that must not be skipped.

My floors slope but there are no cracks anywhere. Is the foundation fine?

Not necessarily, and in west Plano this is the common presentation rather than the unusual one. A post-tension slab doing exactly what it was designed to do will stay intact while the ground beneath it moves, which means the slab tilts as a unit and you feel it in the floors long before you see it in the walls. An absence of cracking is evidence the slab is performing, not evidence the soil is still. The measurement that settles it is an elevation survey across the whole floor plan, not a hunt for cracks — a few hundred dollars, and it converts "the floor feels wrong" into numbers you can compare against a later reading. Our guide to uneven and sloping floors goes into how much slope is normal.

What does foundation repair cost in Plano?

Plano is on the same Blackland clay as the rest of east Collin County, so clay-area pricing applies: concrete pressed pilings commonly $300 to $600 each, a typical perimeter job roughly $4,000 to $10,000, steel push piers $1,200 to $1,900 where the clay runs deep or loads are heavy. The Plano-specific additions are on a post-tension house: cable locating before any coring, commonly $300 to $900, and a preference for tunneling to reach interior points rather than breaking the slab, at $150 to $250 per linear foot. On an older east Plano slab with no cables, interior access is simpler and cheaper. General ranges only; see the cost guide and our cost per pier breakdown.

Do post-tension slabs wear out?

They are not a consumable, but they do age, and Plano holds some of the oldest residential post-tension slabs in Texas — a good number are now past forty. The documented long-term concern is corrosion at the tendon anchorages, where the cables are stressed and locked off at the slab edge. Unbonded tendons are greased and sheathed against exactly this, so it is not a routine finding; it becomes possible where the sheathing was damaged during construction or where water has had persistent access to an anchorage. It is a thing a structural engineer looks at on an older post-tension slab rather than something to worry about on a Tuesday. If your house is in that age bracket and an engineer is already coming out, it is a reasonable question to put to them.

Do I permit with Plano or with Collin County?

With the City of Plano for any property inside the city limits, which is almost all of what people mean by Plano. Foundation repair and underpinning normally require a permit, typically supported by engineered documentation, and pulling it is the contractor responsibility rather than yours. Collin County handles work outside incorporated city limits. The neighboring cities each run their own permitting as well — Allen, Frisco, Richardson, Murphy and Wylie among them — and city boundaries in this part of the county do not always follow what a mailing address or school district suggests. A contractor vague about which jurisdiction they are filing in is worth a second look.

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