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Cost guides

Foundation & Water Cost Guides

Price guides for foundation & water projects. Foundation movement, wet basements, mold, sewer lines and septic systems are stressful problems, and the repair method you choose changes the bill more than anything else. Each guide below explains typical 2026 costs, the options contractors will offer, and when to call an engineer or licensed specialist first.

Price snapshot: most common projects

Typical total ranges most homeowners pay, from each guide (national averages, October 8, 2026). Open a guide for prices per unit, by material and by job size.

ProjectTypical range
Foundation Repair Cost$2,200–$8,100
Crawl Space Encapsulation Cost$3,000–$15,000
Basement Waterproofing Cost$2,500–$8,200
Sump Pump Installation Cost$600–$2,500
Mold Remediation Cost$1,200–$3,750
Sewer Line Replacement Cost$1,400–$10,000
Septic Tank Installation Cost$3,500–$12,500
Radon Mitigation System Cost$800–$2,000
Asbestos Removal Cost$1,200–$3,200
French Drain Cost$1,650–$12,250
Retaining Wall Cost$3,500–$10,000

Foundation

Main guidefoundation repair cost$2,200–$8,100 totalfoundation leak repair cost$2,000–$7,000 totalcrawl space foundation repair cost$2,500–$8,000 totalpier and beam foundation repair cost$4,000–$14,000 totalslab foundation repair cost$1,000–$10,000 totalsinking foundation repair cost$4,500–$20,000 totalmudjacking cost$650–$1,900 total

Basement & Crawl Space

Main guidecrawl space encapsulation cost$3,000–$15,000 totalMain guidebasement waterproofing cost$2,500–$8,200 totalMain guidesump pump installation cost$600–$2,500 totalbasement water damage repair cost$2,000–$7,000 total

Mold & Water Damage

Main guidemold remediation cost$1,200–$3,750 totalceiling water damage repair cost$400–$1,600 totalattic mold remediation cost$1,000–$4,000 totalcrawl space mold remediation cost$500–$4,000 total

Sewer & Drains

Main guidesewer line replacement cost$1,400–$10,000 totalsewer line camera inspection cost$125–$500 totaltrenchless sewer line replacement cost$2,000–$12,000 totaldrain cleaning cost$150–$500 totalhydro jetting cost$350–$1,400 total

Septic Systems

Main guideseptic tank installation cost$3,500–$12,500 totalseptic tank pumping cost$300–$600 totalcost to install septic tank and leach field$3,500–$12,500 totalseptic tank inspection cost$200–$700 totalseptic tank removal cost$900–$2,000 totalseptic tank maintenance cost$150–$600 per yearseptic tank repair cost$600–$3,000 total

Radon & Asbestos

Main guideradon mitigation system cost$800–$2,000 totalMain guideasbestos removal cost$1,200–$3,200 totalasbestos siding removal cost$7.00–$10 per sq. ftasbestos popcorn ceiling removal cost$5.00–$20 per sq. ftasbestos tile removal cost$5.00–$15 per sq. ftasbestos pipe insulation removal cost$2.00–$15 per linear foot

Walls & Drainage

Main guidefrench drain cost$1,650–$12,250 totalMain guideretaining wall cost$3,500–$10,000 totalfrench drain installation cost$1,000–$6,500 totalfrench drain basement cost$4,000–$17,000 totalretaining wall repair cost$200–$1,500 totalboulder retaining wall cost$25–$50 per sq. ft
How we estimate pricesEvery range is built from dated, cited sources. Prices vary by region, home and contractor — always get at least three written quotes. Read our methodology