| Property value | Zone | Distance | Deductible | Estimated annual |
|---|---|---|---|---|
| $250,000 | Moderate | 20–50 km | 2% | $1,180 |
| $350,000 | High | 5–20 km | 3% | $2,560 |
| $500,000 | Severe | <5 km | 5% | $5,920 |
| $400,000 | Low | 50+ km | $2,500 | $1,420 |
The calculator estimates premium by scaling dwelling coverage with a base rate and multiplying by risk factors, then adding optional coverages, fees, and taxes.
DwellingPremium = BasePremium × Π(FactorMultipliers)
AddOns = ContentsPremium + OtherStructuresPremium + ALEPremium
PremiumBeforeFees = DwellingPremium + AddOns
PremiumAfterPlan = PremiumBeforeFees × PaymentPlanFactor
TotalAnnual = (PremiumAfterPlan + Fees + Installments) × (1 + Tax% )
TotalAnnual = max(TotalAnnual, MinimumPremium)
- FactorMultipliers include zone, construction, roof, ages, coast distance, claims, credit, valuation, mitigation, and deductible sensitivity.
- Deductible factor uses a 2% baseline; lower deductibles raise cost, higher deductibles reduce it (bounded for stability).
- Add-on coverages are priced with simplified rates tied to your base rate and wind context.
- Enter property value and the dwelling coverage percentage you want.
- Set a base rate per \$1,000 that matches local quote ranges.
- Select risk zone, construction, roof details, and coast distance.
- Choose deductible type and value; higher deductibles often lower premium.
- Add optional coverages and select mitigation features if installed.
- Pick a payment plan and include any known fees and taxes.
- Click “Calculate cost” to view results above the form.
- Use the CSV or PDF buttons to save the estimate.
How coverage level drives the estimate
Dwelling coverage equals property value multiplied by your coverage percent. The base premium is (dwelling coverage ÷ 1,000) × base rate. For example, $350,000 at $3.75 per $1,000 starts near $1,312.50 before multipliers, optional coverages, and fees. If you insure at 90%, the model scales linearly, but underinsurance can reduce claim payouts under some settlement rules.
Risk zone and coastal distance impact
Two dominant drivers are the zone multiplier and the distance-to-coast multiplier. In this model, zones range from 0.85 (Low) to 1.55 (Severe). Distance ranges from 0.90 (50+ km) to 1.25 (<5 km). Combining High (1.25) with <5 km (1.25) produces a 1.5625 lift before other factors. Moving one zone level can outweigh small fee changes, so calibrate zone and distance first when comparing properties.
Building features that shift multipliers
Construction and roof choices affect expected wind resistance. Reinforced concrete uses 0.85, masonry 0.90, and frame 1.00 in the factor set. Roof type ranges from metal 0.90 to flat 1.10. Roof age adds 0.93 for newer roofs and up to 1.18 for older roofs, reflecting higher damage probability.
Deductible strategy and cash-flow planning
Deductibles trade upfront cost for out-of-pocket exposure. The calculator uses a 2% baseline: choosing less than 2% increases the deductible factor, while higher deductibles reduce it, capped for stability. Payment plans may add installment fees; the annual plan applies a 0.97 paid-in-full factor to the premium before fees.
Using outputs to compare scenarios
Use “effective cost per $1,000 dwelling” to normalize across coverage levels. Then compare the breakdown to see whether costs are concentrated in dwelling risk or in add-ons like contents and additional living expense. Mitigation selections apply multiplicative discounts, such as 0.95 for shutters and 0.97 for roof-to-wall straps, improving the overall multiplier. Results update instantly.
Frequently asked questions
Is this an exact quote?
No. It is an estimate using transparent assumptions. Real pricing depends on carrier rules, inspections, territory, limits, endorsements, and underwriting decisions.
What base rate should I enter?
Use a rate that reflects your market, often derived from a recent quote: premium before taxes divided by (dwelling coverage ÷ 1,000). Then test scenarios consistently.
How do mitigation features affect cost?
Each mitigation option applies a discount multiplier. Selecting multiple items compounds the reduction, which can noticeably lower the dwelling premium in higher-risk zones.
Why does a lower deductible increase the estimate?
Lower deductibles shift more loss cost to the insurer. The model applies a surcharge below the 2% baseline to reflect the higher expected claim payments.
How are contents and other coverages priced?
They are estimated as percentages of dwelling coverage with simplified rates tied to your base rate and wind context. Carriers may price these differently.
Can I export my results?
Yes. After calculating, use the CSV button for spreadsheet analysis or the PDF button for a shareable summary. Printing is also supported.