Mold needs three things: spores, food and water. The first two are already inside nearly every house in Collin County. Water is the variable a homeowner can actually control, and in this part of North Texas it arrives through a short, predictable list of openings.
Plano’s summers are long and humid, with DFW dew points sitting in the mid-60s for roughly five months. Almost every home sits on a slab over shrink-swell Blackland clay, so instead of a wet basement you get a slab leak soaking a wall from below. Add an attic air handler, a roof that has been tested by hail, and the burst pipes of February 2021, and the causes repeat from street to street.
That pattern does not stop at the city limit. The independent, TDLR-licensed companies that quote mold removal plano work commonly serve Frisco, McKinney, Allen, Richardson, Wylie, Murphy, The Colony and Carrollton as well. Same climate, same clay, same construction waves — a job described over the phone in Plano usually sounds familiar to an estimator who spent the morning in Allen.
What shifts from city to city is the age and type of housing stock. Plano’s median home was built in 1993, and 64 percent of its units went up between 1970 and 1999; roughly one in six predates 1980. The older east and central tracts tend to still have original cast-iron drains under the slab, which is why slab leaks show up so often as the root cause. West Plano homes from the 1990s and 2000s are typically two stories with the air handler in the attic, and they sat under the June 2012 and April 2016 hail paths. Those development waves cross municipal lines, so a 1980s house in Richardson and an older Plano property can hide the same corroded drain line, while a 2005 build in Frisco or Murphy raises the odds of an attic unit and a hail-bruised roof deck.
Scrubbing a stain is the easy part. The companies worth hiring are judged on three things: whether they find the water, whether they keep spores contained while they work, and whether they can prove materials are dry before the wall is closed. None of that depends on which suburb the house sits in.
What a Licensed Texas Job Includes, From Carrollton to McKinney
Texas draws a hard line at 25 contiguous square feet of mold. Below it, a homeowner may clean the area personally or hire anyone. At or above it, hired work becomes a licensed project, and the law requires two different companies — the same company may not perform both roles on one job.
A TDLR-licensed mold assessment consultant meters the walls and floor, traces the water source and marks how far the damage runs. That consultant writes a protocol specific to the house: rooms, quantities, methods, containment and clearance criteria, delivered at least a day before work begins. A separate TDLR-licensed remediation company then writes a work plan that follows the protocol and notifies TDLR five days ahead, or by the next business day in a water-damage emergency. The notification fee is $25.
On site, expect plastic sheeting, a zipper door and a HEPA air scrubber keeping spores out of the rest of the house, with yellow project signs at the entrances. Porous material with growth — drywall, insulation, carpet pad — is cut out and bagged inside containment, while framing and concrete are HEPA vacuumed and cleaned. Air movers and dehumidifiers run until framing and slab reach the protocol’s dry target, and drying usually sets the schedule. The assessor returns while containment is still standing, checks visually and by any sampling the protocol calls for, and writes a passed clearance report. Within 10 days of finishing, both companies sign the Certificate of Mold Damage Remediation, TDI form MDR-1.
The paperwork matters in every suburb. Unlicensed work carries a TDLR penalty of $2,000 to $5,000 per violation, and up to $5,000 a day under Occupations Code 51.302. Under Insurance Code 544.303, an insurer may not underwrite against a home because of remediated mold damage shown on a certificate, and sellers must hand buyers every certificate from the prior five years.
Permits run on separate tracks. Cutting out and cleaning mold-damaged material usually needs no Plano permit, but plumbing, foundation, HVAC, roof and wall rebuilds do, performed by contractors registered with that city. Neighboring cities run their own building departments, so confirm locally before a rebuild starts.
Comparing Quotes Across Wylie, The Colony, Frisco and Plano
Size, material removed, containment, drying and rebuild drive the number, and assessment, protocol and clearance are separate invoices from a separate company. Published national planning ranges give a starting point, though they are not quotes. Remediation runs about $10 to $25 per square foot, averaging near $18, according to This Old House in March 2026; Fixr in 2025 listed $10 to $30. A typical whole job lands between $1,500 and $9,000, with a national average near $3,500, per Fixr in August 2025. Small areas scale accordingly: roughly $500 to $1,250 for 50 square feet, $1,000 to $2,500 for 100, $2,000 to $5,000 for 200, and $5,000 to $12,500 for 500 square feet, per This Old House. Whole-house projects run $10,000 to $30,000. A licensed assessor’s inspection and testing, billed separately, runs $303 to $1,044 with an average near $670, plus $250 to $350 in air-sample lab fees, per HomeAdvisor in 2025.
Actual numbers come from the companies after they look at the job. A request through the free quote service is passed to independent, TDLR-licensed companies that contact the homeowner directly, with no obligation to hire anyone. Get at least two written quotes and read what each one excludes.
Ask every bidder the same questions: Is the assessor a different company from the remediator? Does the price include containment, HEPA filtration, drying equipment and clearance? Is the $25 TDLR notification built in, or extra? Will both companies sign the certificate? Who handles the rebuild if a wall comes out? In older Richardson and central Plano homes, ask specifically whether the water source was traced to a cast-iron drain before anyone closes the wall; in Frisco and Murphy, ask whether the attic air handler and ductwork were checked.
Insurance deserves its own conversation. Texas policies usually cover a sudden and accidental discharge of water and usually do not cover a continuous leak. Most pay to remove mold only as part of repairing covered damage, and many cap or exclude remediation unless endorsed. Report hidden losses within 30 days of discovery, photograph the original condition before cleanup, and keep the clearance report and certificate with the policy file.
