All-in$0± range
Collin County, Texas · real 2026 data

How much does a barndominium cost in Collin County?

A typical build is below — tap to make it yours
✓ Add a shop / garage (the barndo classic)
All-in · build + land + utilities + soft costs
$0
$450,144 — $866,208 range
For a 3 bed / 2 bath barndo in Collin County · ≈ $326/sf
Rough estimate · we'll sharpen it
Build $230k 35%
Land $300k 46%
Site & utilities $75k 12%
Soft costs $8k 1%
Buffer $38k 6%
The steel kit + slab is only ~11% of your all-in — the rest is land, site work, utilities & finish. That gap is what blindsides people.
≈ 21% less ($170k saved) than the same home built traditional (~$821k)
Modeled from Collin County records + real owner build reports · updated 2026-06 · shown as low–median–high ranges, never a blind average.
WARNING: Wells cost $60k+10-acre OSSF exemption
A few quick questions — we handle the rest
Do you have land yet?
Roughly where in Collin County?
How much land?
What are you picturing?
tile/LVP, mid-grade cabinets, a few custom touches — finish swings this build ~$90k from basic to high-end. It's where budgets quietly blow up.
Water
Sewer
Electric
Insulation
Contingency buffer
Your itemized all-in — exactly where every dollar goes
Know a real figure for any line — a well quote, your land price? Type it in the box and that line locks to your cost.
The build
Kit shell + slab
2,000 sf shell · $20–$55/sf · incl. engineered slab for clay
$70,000$40,000–$110,000
Interior build-out
2,000 sf living · nice finish · $65–$85/sf
$150,000$130,000–$170,000
Insulation — spray foam
Closed-cell foam — owners' #1 'don't skimp' item (it sets your power bill)
$10,000$8,000–$12,000
The land
Land
~1.5 ac near Near McKinney · $120k–$280k/ac
$300,000$180,000–$420,000
Site & utilities
Site prep
Clearing, grading, driveway, building pad
$8,000$5,000–$12,000
Water — drill a well
No city water at most Near McKinney lots. Trinity, 1000–1500 ft.
$50,000$40,000–$60,000
Septic — aerobic
Clay soil needs aerobic. Incl. $400 county permit.
$9,400$8,200–$12,400
Electric service
Power's typically at the road here
$5,000$2,500–$7,500
Propane tank & line
No natural gas — propane
$2,000$1,500–$2,500
Water softener
Trinity well water is hard
$1,000$500–$1,500
Soft costs & permits
Plans & engineering
Design + engineered-slab stamp
$3,500$2,500–$4,500
Land survey
Required for septic, lender & build
$2,500$1,500–$3,500
Soil & perc test
Before septic design
$2,000$1,500–$2,500
Building permit
$0 — Collin County requires none
$0
Buffer & financing
Contingency (12%)
Cushion on build & site — every real build needs one
$37,608$28,944–$47,808
All-in (median)$651,008
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Build your barndominium in Collin County, Texas with accurate cost estimates.

What's actually under a Collin County barndo

CLAY SOIL — DOESN'T DRAINTRINITY AQUIFER · ~1000–1500 FT DOWNENGINEERED SLAB1234
  1. Drilled well — Trinity aquifer, 1000–1500 ft down · $40k–$60k
  2. Aerobic septic — the clay won't perc, so it's required · $8k–$12k + $400 permit
  3. Power from the road — $3k–$8k (much more on a long rural run)
  4. Engineered slab — clay soil demands it, baked into the build
Not to scale — a 1500-ft well is deeper than this whole page. That's the point: your number includes what's under the dirt, not just the building.

How we calculate this

  1. You pick a build (by bedrooms or by size) and tell us about your land in plain English — where, how big, what finish.
  2. We translate that into real Collin County costs: Trinity-aquifer well depth, the septic type the soil forces, permit rules, and how far power has to run.
  3. Every line shows a low–median–high range, not a blind average, so outliers don't distort your number.
  4. Know a real figure (a well quote, your land price)? Enter it and that line locks to your actual cost — the estimate converges on reality.

Frequently asked: barndominiums in Collin County

What this estimate does not include

Where these numbers come from

These costs are modeled from public Collin County records and real, published build-cost reports from owners and builders — shown as low–median–high ranges, never a blind average, and updated 2026-06. Sources: Collin County OSSF fee schedule; Trinity Aquifer well data; Active land listings. Note: Texas is a non-disclosure state, so true land sale prices aren't public — land figures are modeled from active listings by acreage band, which is exactly why entering your own parcel price gives the most accurate result.

Barndominium cost guides

Want the bigger picture beyond Collin County? These no-hype guides cover the numbers most sites skip: