Rebuild Cost Calculator
Protecting Your Property with Data That Matters
For Homeowners, Landlords & Business Owners
Why Rebuild Cost Isn’t Optional!
Using a Rebuild Cost Calculator is vital when it comes to building insurance, as your property’s market value means nothing. What matters is the cost to rebuild it from the ground up - including materials, labour, demolition, professional fees and every inch of compliance. That’s your rebuild cost - and without knowing it, your policy could fall apart when you need it most.
Enter: the Rebuild Cost Calculator, and even more crucially, the Rebuild Cost Assessment. Both give you a clear-eyed view of what full reinstatement will really cost.
What Is a Rebuild Cost Calculator, Really?
Forget generic tools. A rebuild cost calculator worth its salt doesn’t throw out quick guesses
Our rebuild cost calculator leans on rigorous industry datasets like those from BCIS (Building Cost Information Service) and tailored inputs from professionals who understand your building’s specifics.
Whether you're protecting a family home, a property portfolio or commercial premises, you need more than a surface-level figure. You need an informed valuation grounded in:
- The type and age of your property
- The materials and design details
- Complexities like basements, listed features and external structures
- Labour, access issues, demolition costs, compliance fees, and VAT
This isn’t something a one-size-fits-all calculator can do. Which brings us to...
Reinstatement Valuations: What It Does, Why You Need It
A Rebuild Cost Assessment is a detailed, insurance-ready valuation of what it would cost to fully rebuild your property to its current specification. Unlike simple calculators, these assessments:
- They are professionally prepared using BCIS-backed cost modelling
- Include site clearance, professional fees, and inflation uplift
- Adjust for location factors, access challenges, and unique finishes
- Are updated in line with current cost indices and building regulation changes
At Exactum, we specialise in providing remote and on-site RCAs that help property owners avoid both underinsurance and overpayment. The result: confidence, compliance and long-term cost savings.
Who Should Get a Professional Rebuild Cost Assessment?
If you are:
- A homeowner who has extended, renovated or owns a unique property
- A landlord responsible for multiple or mixed-use buildings
- A business owner with commercial premises, warehouses, or retail units
- A property manager seeking portfolio-wide accuracy for insurers
...then an expert rebuild assessment isn’t a luxury - it’s a necessity.
People Also Ask
What is the difference between market value and rebuild cost?
Market value is what someone would pay to buy your property. Rebuild cost is what it would take to reconstruct it from scratch, factoring in labour, materials, design, and regulation compliance. Insurance policies are based on rebuild cost, not market value.
How do I know if I’m underinsured?
If your policy's rebuild figure hasn’t been reviewed in over 3-5 years, or you’ve made alterations, you’re likely underinsured. Most UK properties are undervalued by 20-30% for insurance purposes. An expert assessment corrects that gap.
Can I estimate the rebuild cost myself?
You can guess, but it’s risky. Without access to BCIS datasets and current cost indices - and without factoring in unique property characteristics - you're likely to get it wrong. A professional assessment ensures your figure stands up to scrutiny.
What does an expert reinstatement cost valuation include?
Everything from structural details and square footage to demolition, professional fees, and cost inflation. With Exactum, it’s delivered in a clear, insurer-ready format - ideal for homeowners, brokers and portfolio landlords alike.
Why Exactum?
At Exactum, we don’t just run numbers - we interpret them. Our team combines decades of valuation experience with the power of BCIS data to deliver fully tailored, RICS-compliant Rebuild Cost Assessments. We make complex simple - and insurers listen.
Whether it’s a modern detached house, a converted warehouse or a block of flats, we adapt our approach to suit your property - not the other way around.
The Real Risks of Guessing Your Rebuild Value
Let’s be blunt: guessing your rebuild cost is a gamble, and in this game, the house (or insurer) always wins.
Here’s what guessing gets you:
- Underinsurance - Say your property would cost £500,000 to rebuild, but your policy only covers £350,000. That 30% shortfall? You’re expected to absorb it.
Even if you only claim for partial damage (say £100,000), the insurer may only pay 70%, citing the ‘average clause’.
→ That’s a £30,000 loss. Out of your own pocket. - Overinsurance - Perhaps you’ve overestimated. Instead of £400,000, you’re insured for £650,000.
You’ll never get more than the rebuild cost, but you’ll be paying inflated premiums year after year, funding coverage you don’t need.
→ That’s hundreds - maybe thousands - down the drain annually. - Policy challenges - Inaccurate rebuild figures can raise red flags with insurers. They may delay claims, request reassessments, or even reject payouts altogether.
→ That's time wasted during a crisis, when speed and clarity matter most.
Ready to Take the Guesswork Out?
If you’re unsure where to start, we’re here to help.
Whether you're a private homeowner or managing a nationwide portfolio, Exactum is ready to help. Get a Rebuild Cost Assessment you (and your insurer) can rely on.
Book your rebuild valuation today and protect what matters.
Call 0800 028 0695 today