Estimator Worked Example
One run of the Drainfield Pros estimator, line by line: the inputs, each published range, and the total.
Worked example: the estimator with these inputs: 3 bedrooms in the home; System type (est. multiplier from published midpoints): Conventional gravel trench; Soil and site (est. multiplier): Good soil, easy access; items: Conventional drain field, est. per bedroom (HomeGuide $2,000–$6,000 per field ÷ 3 bedrooms), Perc / soil test (HomeGuide), Permit (range across HomeGuide and HomeAdvisor), Tank pumping before work (Angi/HomeAdvisor). Each line is the published range times the quantity where it applies, times the multipliers, rounded to the nearest $10.
| Line item | Range |
|---|---|
| Conventional drain field, est. per bedroom (HomeGuide $2,000–$6,000 per field ÷ 3 bedrooms) | $2,010 – $6,000 |
| Perc / soil test (HomeGuide) | $600 – $2,000 |
| Permit (range across HomeGuide and HomeAdvisor) | $250 – $2,300 |
| Tank pumping before work (Angi/HomeAdvisor) | $290 – $570 |
| Estimated total | $3,150 – $10,870 |
Your own numbers will differ. Run the estimator with your inputs, and see the methodology for where each range comes from. Guides: Drain Field Replacement Cost, Signs Your Drain Field Is Failing, Perc Test Cost and What It Tells You.