Home  /  Insights  /  Property Survey and Construction
Property Survey and Construction  

Rebuild Cost Calculators for Home Insurance: Why They Matter

Insure for rebuilding, not market value.

Rebuild Cost Calculators for Home Insurance: Why They Matter Property Survey and Construction

Updated October 2026 · Fraser Bond

Insurance · Rebuild cost

Rebuild cost and insurance

Rebuildnot market value
BCIScalculator
Averageclause
Reviewregularly
In short: Buildings insurance should cover the cost of rebuilding your home, including demolition, site clearance and professional fees, not its market value. Many homes cost less to rebuild than they would sell for, but listed, period and unusual homes can cost more. Underinsuring can lead an insurer to reduce claims proportionately (an "average" clause). The BCIS online calculator gives an estimate for standard houses; get a professional assessment for listed, very large or non-standard homes. For flats, the freeholder usually insures the whole building.
Rough rebuild estimate
Estimated rebuild cost–

Use BCIS or a surveyor for an accurate figure.

Frequently asked questions

Is rebuild cost the same as value?

No.

What if I underinsure?

Claims may be reduced.

Selling or letting?

Talk to our team or get a free valuation.

Speak to our teamGet a free valuation

Related guides

Next step

You are one message away from an answer.

If you have a question

Send it to us and get a straight answer.

Describe the property and the problem. We will tell you what we would do, what it should cost, and if we are not the right people, who is.

  • Replies the same working day
  • The person who answers is the person who handles it
  • No fee, and no obligation to instruct us
If you are looking for a property

See everything we are instructed on.

Sales and lettings across Prime Central London and the wider UK, with the same team behind every listing.

  • Residential and commercial in one search
  • Filter by borough, budget and size
  • Register once and we will send matches first