Rebuilding Cost Calculator for Insurance Purposes UK
Enter property details to estimate rebuild cost for buildings insurance. Review annually as costs rise.
Property Basics
2
Size & Type
Extras
How It Works
Base rate per m² varies by type (£1,800 flats to £3,600 detached). Multipliers apply for construction, age, location. Add 12% for fees like architects, demolition. Extras cover extensions at £2,500/m². Regional zones uplift London/SE most. [web:1][web:4]
Step-by-Step Guide
- Measure total floor area across all floors from plans or estate agents.
- Select type matching your home; adjust for non-standard.
- Enter postcode first for accurate regional factor.
- Toggle inflation for current year adjustment.
- Click Calculate; export for insurer discussions.
Frequently Asked Questions
- Why not market value?
- Rebuild covers labour/materials to reconstruct, excluding land value which insurers omit. Over-insuring raises premiums. [web:2][web:3]
- Underestimate risks?
- Insurer pays proportion; e.g., £200k claim on £150k sum gets £150k max. Always err higher. [web:1]
- Listed home?
- Select Yes; adds 30%+. Get surveyor for heritage features. [web:3]
- Extensions included?
- Yes, separate m² input. Garages add 5-15%. [web:4]
- Update frequency?
- Annually or post-renovation; costs rose 20% recently. [web:2]
Common Mistakes
- Using sale price: Typically 20-50% higher than rebuild.
- Ignoring region: London costs 30% more than North.
- Forgetting fees: Architects/planning add 10-15%.
- Static figures: No inflation leads to shortfalls.
- Non-standard skip: Thatched roofs double base rate.
Cost Comparisons by Type (2025 Averages)
| Property | 100m² Example | Key Factors |
|---|---|---|
| Terraced | £230,000-£280,000 | Standard brick, North |
| Semi-detached | £280,000-£340,000 | Midlands, garage |
| Detached | £360,000-£450,000 | South, listed |
| Flat | £190,000-£240,000 | Central, modern |
References
Building Cost Information Service (BCIS). Residential Rebuilding Costs Calculator. Association of British Insurers, 2025.MoneySavingExpert. Calculating Rebuild Costs for Home Insurance. UK Edition, 2025.
Association of British Insurers (ABI). Buildings Insurance: Calculating Your Rebuild Cost. Guidance for Policyholders, 2025.
Checkatrade. Free Rebuild Cost Calculator for 2025. Cost Guides, February 2025.