Calculator Documentation
Insurance Cost Estimator
Estimate landlord insurance premiums based on property value, type, coverage level, and risk factors. This is an estimate only, not a binding quote.
Schema version 2.0.0 · Category: investment
Inputs
Property Details
| Field | Type | Default | Notes |
|---|---|---|---|
| Property Value | currency | $300,000 | Estimated market value (context only; premiums price on rebuild cost) |
| Square Footage | number | 1800 | Living area; drives the rebuild cost your dwelling coverage is based on |
| Rebuild Cost / Sqft | currency | $160 | Local construction cost per square foot ($140-200 typical in 2026) |
| Property Type | select | 1 | Type of investment property |
Coverage
| Field | Type | Default | Notes |
|---|---|---|---|
| Coverage Level | select | 1 | Level of insurance coverage |
| Deductible | select | 1 | Higher deductible lowers your premium |
Risk Factors
| Field | Type | Default | Notes |
|---|---|---|---|
| Property Age | select | 1 | Older properties typically cost more to insure |
| Has Pool | toggle | false | Pools increase liability risk |
| Claims History | select | 1 | Prior claims history affects premium |
Adjustable Parameters
| Parameter | Default | Range | Purpose |
|---|---|---|---|
| Base Rate (% of Value) | 0.004 | 0.002 - 0.008 | Base annual premium as percentage of property value |
Calculations
Every figure this calculator produces, in evaluation order. Formulas reference input ids, parameters, and earlier calculations.
replacementCostEstimated rebuild cost (dwelling coverage basis)
squareFootage * rebuildCostPerSqft
basePremiumBase annual premium (replacement cost x base rate)
replacementCost * baseRate
poolMultiplierPool liability multiplier
if(hasPool == 1, 1.05, 1.0)
adjustedPremiumPremium after all risk factor adjustments
basePremium * propertyType * coverageLevel * deductible * propertyAge * poolMultiplier * claimsHistory
annualPremiumEstimated annual premium
round(adjustedPremium, 0)
monthlyPremiumEstimated monthly premium
round(annualPremium / 12, 2)
dailyRateDaily insurance rate
round(annualPremium / 365, 2)
costPer100kAnnual cost per $100k of property value
if(propertyValue > 0, round((annualPremium / propertyValue) * 100000, 0), 0)
premiumToValuePctAnnual premium as a percentage of property value
if(propertyValue > 0, (annualPremium / propertyValue) * 100, 0)
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