Termite Bond Cost Calculator
Analyze termite bond (warranty) cost vs. self-insuring risk — compare annual bond fees against expected damage costs and break-even timeline.
About this calculator
This calculator frames a termite bond as an insurance decision: it compares the guaranteed cost of paying for a bond against the probabilistic cost of going without one. It assumes a flat 1.5% annual risk of infestation nationally, then computes the probability of at least one infestation over your analysis period as 1 minus the probability of zero infestations compounded across all years — 1 minus (1 minus 0.015) raised to the number of years. Expected damage cost isn't tied to that compound probability, though; it's simplified as the expected number of infestations (years times 1.5%) multiplied by an average repair cost of $5,000, scaled proportionally to your home's square footage relative to a 2,000 sq ft baseline. The self-insure comparison also adds retreatment costs assumed to recur every 7 years at 80% of your initial treatment price, even without a bond.
Break-even year is solved by comparing the annualized self-insure cost against your annual bond premium: if self-insuring is cheaper per year, break-even is reported as effectively never (capped at 99 years) rather than a negative number. The repair-coverage-value output only has weight for retreatment-plus-repair bonds — a retreatment-only bond doesn't credit you with covering repair costs, since it won't. Remember every input here is a national average or rule of thumb: real termite pressure varies enormously by region and construction type, so a homeowner in a high-pressure zone (much of the Southeast) is taking on more real risk than this flat 1.5% figure implies.
Inputs
Results
Total bond cost over period ($)
$3,700.00
≈ 4 smartphones
Bond value / savings ($)
-$790.00
How to Use This Calculator
- Enter the structure square footage and estimated home value.
- Set the warranty type: retreatment-only or damage repair and retreatment.
- Input the initial treatment cost and the annual renewal premium.
- Review the total bond cost over the analysis period, the bond value/savings, and the break-even year.
- Compare bond cost against the average termite repair claim amount to evaluate value.
How the result changes with Annual bond renewal ($)
| Annual bond renewal ($) | Total bond cost over period ($) | Bond value / savings ($) |
|---|---|---|
| 125 | $2,450.00 | $460.00 |
| 188 | $3,080.00 | -$170.00 |
| 375 | $4,950.00 | -$2,040.00 |
| 625 | $7,450.00 | -$4,540.00 |
What each input means
- Home size (ft²)
- Heated square footage of the home.
- Home value ($K)
- Home market value in thousands of dollars.
- Annual bond renewal ($)
- Yearly cost to maintain the termite bond/warranty.
- Initial treatment cost ($)
- One-time treatment required to start the bond.
- Analysis period (years)
- Number of years to compare bond cost vs. risk.
- Bond type (0=Retreatment, 1=Retreatment+Repair)
- 0 = Covers retreatment only. 1 = Covers retreatment and structural repair.
What each result means
- Total bond cost over period ($)
- Initial treatment + annual bond fees over the analysis period.
- Infestation probability (%)
- Probability of at least one termite infestation during the analysis period.
- Expected damage cost ($)
- Statistical expected cost of termite damage without protection.
- Self-insure total cost ($)
- Expected total cost of treatment + damage without a bond.
- Bond value / savings ($)
- Positive = bond saves money vs. self-insuring. Negative = bond costs more.
- Break-even (years)
- Years until bond cost is justified by expected savings.
- Bond as % of home value
- Annual bond cost as a percentage of home value.
- Repair coverage value ($)
- Value of repair coverage (retreatment+repair bonds only).
How this is calculated
Worked example, using the default values
- Identify Input Parameters4 parametersHome size (ft²) = 2000, Home value ($K) = 300, Annual bond renewal ($) = 250, Initial treatment cost ($) = 1200 = 6 input(s) provided
- Calculate Total bond cost over periodTotal bond cost over period = initialTreatmentCost + (annualBondCost * yearsToAnalyze)3700 = $3,700
- Calculate Bond value / savingsBond value / savings = selfInsureCost - totalBondCost-790 = $-790
- Calculate Infestation probabilityInfestation probability = 1 - probNoInfestation14.03 = 14.03
- Calculate Expected damage costExpected damage cost = expectedInfestations * avgDamageCost750 = $750
Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.
Frequently Asked Questions
Why doesn't switching from retreatment-only to retreatment-plus-repair change the total bond cost or savings figure?
Bond type only feeds the repair-coverage-value output in this calculator — the total bond cost calculation (initial treatment plus annual fees) and the bond-value-savings comparison use the same formula regardless of which bond type you select. The repair-coverage-value figure is meant to show what a retreatment-plus-repair bond is worth on top of that shared cost baseline: it equals the full expected damage cost for that bond type and zero for retreatment-only, since a retreatment-only bond doesn't reimburse structural repairs.
Why is the infestation probability different from the expected damage cost calculation?
Infestation probability is computed correctly as a compound probability: 1 minus the chance of zero infestations in every year of the analysis period, or 1 minus (1 minus 1.5%) raised to the number of years. Expected damage cost, however, uses a simplified expected-value shortcut instead — years times 1.5% times average damage cost — which is mathematically the expected number of infestations rather than tied to the probability of at least one occurring, so the two figures answer related but distinct questions.
How is the break-even year calculated, and what does a value of 99 mean?
Break-even year divides your initial treatment cost by the difference between the annualized self-insure cost (expected damage plus periodic retreatment, spread evenly across the analysis period) and your annual bond premium. If self-insuring is actually cheaper per year than the bond, there's no real break-even point, so the calculator caps the reported value at 99 years as a stand-in for "effectively never pays off" rather than showing a negative number.
Why does expected damage cost scale with home square footage instead of home value?
The calculator scales its $5,000 average damage cost baseline by your home's square footage relative to a 2,000 sq ft reference home, on the assumption that larger structures have more wood-framed area exposed to termite damage. Home value is used only for the separate "bond as % of home value" output, so two homes of the same square footage get the same expected damage estimate even if their market values differ substantially.
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