ZeroFee Tools' home repair cost estimators are free online calculators that estimate what water damage restoration, HVAC replacement and mold remediation cost. Answer a few questions to get an instant low-high range based on 2026 U.S. national average pricing. No signup required.
Updated for 2026 · Based on national average pricing
Three of the most expensive - and most searched - home repairs are water damage restoration, HVAC replacement, and mold remediation. According to 2026 national averages, a typical water damage job runs $1,383–$6,370 (about $3,860 on average), a full HVAC system replacement costs $7,000–$13,000 for a standard AC + furnace combo, and professional mold remediation averages $10–$25 per square foot of contaminated area.
What drives the price up or down? For water damage, it's the contamination category: clean water from a burst pipe ($3–$4/sq ft) costs far less to remediate than black water from sewage backup ($7–$7.50/sq ft) - and waiting 24–48 hours can push a Category 1 job into Category 2 or 3 territory as bacteria multiply. Drywall removal and flooring replacement are the most common add-ons.
For HVAC replacement, equipment choice dominates: a basic central AC starts around $3,500 installed, while a whole-home ductless mini-split or geothermal system can reach $20,000–$30,000. High-efficiency models add $2,000–$4,500 but cut energy bills for 15+ years, and new ductwork adds another $2,000–$5,000. Regional labor rates swing the total by ±15%.
Mold remediation pricing follows the contaminated area and where it hides: surface mold in a bathroom ($500–$1,500 typical) is a different job than mold inside wall cavities, crawl spaces ($2,000–$8,000), or an HVAC system ($3,000–$10,000). Per EPA guidance, patches under 10 square feet are often DIY-able with proper protection; anything larger - or anything involving HVAC or sewage - calls for a professional.
How to use these calculators
Pick the estimator, answer 4–5 questions about your situation.
Get an instant low–high range based on 2026 national averages, with a line-by-line breakdown.
Use the range to sanity-check contractor quotes - then get at least 2–3 local quotes before hiring.
Estimates are planning tools, not bids. Actual prices vary by market, access, and job complexity - always confirm with a licensed local contractor.
Frequently asked questions
How accurate are these home repair cost estimates?
They are planning ranges based on 2026 U.S. national averages, accurate enough to sanity-check quotes. They are not bids: regional labor rates swing totals by about 15%, and access, materials and job complexity change real prices. Always get written quotes from licensed local contractors.
Why does water damage cost more the longer I wait?
Standing water breeds bacteria fast. Within 24-48 hours a clean-water (Category 1) job can become gray or black water (Category 2-3), jumping from $3-4 to $7-7.50 per sq ft, plus mold risk. Fast extraction and drying is the cheapest thing you can do.
What affects HVAC replacement cost most?
Equipment choice dominates: a basic central AC starts around $3,500 installed, while a ductless mini-split or geothermal system can reach $20,000-30,000. High-efficiency models add $2,000-4,500 but cut energy bills for 15+ years; new ductwork adds another $2,000-5,000.
How is mold remediation priced?
Mostly by contaminated area and hiding place: surface bathroom mold runs $500-1,500, mold in wall cavities or crawl spaces costs $2,000-8,000, and HVAC-system mold $3,000-10,000. The national average is $10-25 per square foot of contaminated area.
Are these cost estimators really free?
Yes: unlimited estimates, no signup, no watermark. They run entirely in your browser, so there is no server cost to pass on to you.
Disclaimer: These calculators provide rough estimates based on 2026 U.S. national averages for planning purposes only. They are not quotes or bids. Prices vary significantly by region, home condition, and contractor. Always get multiple written quotes from licensed local professionals before authorizing work.
How much does water damage restoration cost in 2026?
Short answer: A typical water damage restoration job costs between $1,383 and $6,370, averaging about $3,860 nationally. Clean water from a burst pipe costs $3-4 per square foot to remediate, while black water from sewage backup runs $7-7.50 per square foot. Act fast: waiting 24-48 hours lets bacteria multiply and pushes the job into a higher category.
Drywall removal and flooring replacement are the most common add-ons. Use the water damage estimator above for your specific situation: it prices the job by water category and square footage with a line-by-line breakdown.
Should I hire a professional for mold, or DIY it?
Short answer: Small surface patches under 10 square feet are often DIY-able with proper protection, following EPA guidance. Hire a professional for larger areas, mold inside walls, crawl spaces or HVAC systems ($2,000-10,000), and anything involving sewage. Use the mold estimator above for your situation, then get 2-3 local quotes.
Mold remediation pricing follows the contaminated area and where it hides: surface bathroom mold runs $500-1,500, while mold in wall cavities or crawl spaces costs $2,000-8,000 and HVAC-system mold $3,000-10,000.
How to use the cost estimators
Choose the estimator: water damage restoration, HVAC replacement or mold remediation.
Answer 4-5 questions about your situation (size, type, severity, region).
Get an instant low-high range with a line-by-line breakdown.
Use the range to sanity-check contractor quotes, and get 2-3 local quotes before hiring.
