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How to calculate home insurance rebuilding costs

Most homeowners insurance policies will pay to rebuild your home if it is totally destroyed, but only if you insure it for at least 80 per cent of that cost. First, you'll need to know how much it would cost to rebuild your home. An insurance agent will figure this calculation for you using several factors and programs, but you can create an estimate on your own of a home's rebuilding cost.

Research rebuilding costs instead of home sale costs. Many consumers are astounded when they buy a home for £113,750 and their insurance agent wants to insure it for £195,000 or more. Replacement cost is higher than the cost to buy another similar home on the market because to replace a home, contractors must remove debris from a claim (fire, storm) then rebuild a new home that matches the size and style of the home that was damaged.

Write down the details of your home. Record the overall size of your home (square feet), number of stories, quality and number of bathrooms and kitchens, and other features such as a deck or attached garage. The county auditor or similar authority may have specifics about your home, such as the square footage, listed online.

Contact contractors for estimates. Bear in mind that insurance rebuilding costs are based upon material and labour costs as well as debris removal. New construction in your neighbourhood may be running £58 to £65 per square foot, but if you add debris removal costs from fire, water or wind damage, the cost will rise. Many contractors specialise in insurance work and can help with this calculation. Remember that when talking replacement cost, you are considering replacing the exact features of your home, so older homes with 9-foot ceilings, thick wood trim and large windows may cost more to replace.

Assess your location. Insurance companies pay vendors to develop speciality programs that tell them where rebuilding costs are in a given region at a given time, but you can get an idea on your own by evaluating the local economy. Professional cost models differentiate rebuilding costs by postcode. Consider the demand for construction labour and associated fees in your community. Average rebuild prices for a mid-century ranch in suburban Ohio may be £48 to £58 a square foot, while the cost to rebuild a condo in Manhattan may be £195 a square foot.


  • The cost to rebuild a home is not the same as the cost to buy an existing home on the market. Don't mistake new home prices for the cost to rebuild. Check with your agent every two to three years to request a new rebuilding cost estimate. Older homes generally cost more to rebuild than newer homes due to their custom features, but you can use a "functional replacement cost" endorsement on your homeowners policy to insure your older home only for the cost to repair or replace it with a home that contains newer features and contemporary construction.


  • The "replacement cost" provisions of most policies are usually only triggered if you have insured your home for at least 80 per cent of the cost to rebuild it, so this calculation is very important. Insurance companies have a tendancy to be very rigid with their replacement cost estimates, but remember that you know your home best. If the esitimate from your insurance agent doesn't sound right, ask questions and be sure to point out all the unique characteristics of your home. You do have a say in how much your home is insured for.