What Factors Affect Your Home Insurance Premium?
Why Two Identical Houses Can Have Different Premiums
Home insurance premiums are calculated using a complex set of risk factors. Two houses on the same street might attract quite different premiums depending on a range of personal, property, and environmental factors. Understanding what affects your premium helps you take steps to reduce it - and avoid surprises when you get a quote.
Property-Related Factors
Rebuild Cost
The rebuild cost - not the market value - is the primary driver of buildings insurance premiums. A period property with expensive materials and specialist craftsmanship has a higher rebuild cost than a modern brick box of similar market value.
Construction Type
Standard brick-built houses with slate or tile roofs attract lower premiums than non-standard construction (thatched roofs, timber frames, prefab panels). Insurers consider non-standard construction higher risk due to greater repair costs and fire vulnerability.
Flood and Subsidence Risk
The Environment Agency's flood risk data and historic subsidence records for your postcode directly affect your premium. High-risk postcodes will attract higher premiums or specific exclusions for these perils.
Personal Factors
Claims History
A history of claims - particularly in the last 5 years - signals higher risk to insurers. Multiple claims can significantly increase your premium or lead to decline.
Occupation
Some insurers charge more if you work from home full-time, as the property is occupied more and exposed to different risks. Conversely, a regularly occupied home may be considered lower risk for burglary.
Security
Approved locks, burglar alarms, neighbourhood watch membership, and CCTV can all reduce your premium.
Practical Ways to Reduce Your Premium
- Improve security with BS 3621 deadlocks and NSI-approved alarms
- Pay annually rather than monthly to avoid finance charges
- Increase your voluntary excess
- Shop around every year on Compare the Market, GoCompare, and MoneySuperMarket
- Avoid over-insuring - accurate contents valuation prevents unnecessary cost
