Termite Treatment Cost Estimator

Termite pricing splits across two unit bases. Perimeter treatments (liquid barrier, bait) price per linear foot of foundation; whole- structure treatments (tent fumigation, heat, spot) price per square foot of structure. The method you pick selects the basis automatically.

In estimate mode the foundation perimeter is derived from your home size — you never have to measure. The estimator uses the perimeter of a square of that area; the default shape factor (1.0) reproduces the cited reference homes (≈170 ft for 1,750 sq ft; ≈179 ft for 2,000 sq ft).

// Perimeter methods (liquid, bait) — per linear foot
perimeter_ft = measured                      (measured basis)
             OR 4 × √area × shapeFactor       (estimate basis, shapeFactor = 1.0)
cost_low     = perimeter_ft × rate_low_per_ft
cost_high    = perimeter_ft × rate_high_per_ft

// Whole-structure methods (fumigation, heat, spot) — per square foot
cost_low     = structure_sqft × rate_low_per_sqft
cost_high    = structure_sqft × rate_high_per_sqft

cost_mid     = (cost_low + cost_high) / 2
annual_renewal = renewal ? annual_fee : 0     // display only, never in the band

Default per-method bands (US 2026, overridable): liquid $4.00–$14.50/ln ft; bait $8.00–$12.00/ln ft; fumigation and heat $1.00–$4.00/sq ft; spot $6.00–$8.00/sq ft (per-spot whole-job jobs run roughly $300–$800 each). Bands are national and user-editable — no regional, severity, or home-age multipliers are applied.

The annual renewal / monitoring line is shown separately as "+ $X/yr" and is never folded into the upfront band, so the one-time price stays comparable across methods.