Self Build Insurance: Why You Need to Get Build Costs Right

If you want to protect your project properly, it’s vital that you ensure it’s insured for the right sum throughout the construction phase, says Simon Middleton
Protek self-build insurance
by Protek
20th April 2022

If there is an existing structure forming part of your project then this will need to be considered very carefully. Identifying reinstatement costs in this scenario is best carried out by a building surveyor, who will be able to fully assess the hidden cost of rebuilding – especially if the property is listed.

In some situations, a self builder’s construction costs could be as much as 30% cheaper than a professional reinstatement. While most insurance policies provide an element of increased reinstatement, this can be quickly wiped out if the project goes over budget. For this reason you should reassess your reinstatement cost regularly during the build.

In the grand scheme of things, the effect of reinstatement cost on your insurance premium shouldn’t be your focus. If you suffer a loss and are found to be underinsured by say 50%, your claim can reduced by 50% (the proportion by which it was underinsured), which could result in a bad situation becoming much worse.

It’s important to bear in mind that rebuild costs have absolutely nothing to do with the land value or the market value of a property upon completion. If your mortgage lender asks you to insure for the market value of the completed property, then it’s worth pulling them up on it.

Reality Check: A Worst-Case Scenario

Let’s assume for a moment that you’ve taken a work break (or extensively juggled your hours) to build your own home. You’re saving money by managing the whole project and using individual trades to do most of the work – plus doing a lot of general labour yourself.

It’s now 11 months in and you’re getting close to finishing: the kitchen is being fitted and the last of the decoration has been done. Your final stage payment mortgage drawdown is imminent and you are looking forward to being able to move in to the property and switch to a standard mortgage.

There’s a roofing contractor on site dealing with a flashing that hasn’t been performed correctly – when a freak of bad luck hits. The roofing contractor knocks over his blowlamp and starts a house fire that causes catastrophic damage, rendering the property totally destroyed.

While it’s a devastating situation, you’ll take some comfort from knowing the project is insured for the build cost you stipulated. The problem is, it’s only when you check your policy that you realise the build cost you gave the insurance provider 11 months ago now seems a little low, as the project costs escalated over time.

The loss adjuster arrives on site to assess the damage and start the process of managing the claim. Their job is to get the property rebuilt as quickly as possible and this will involve pricing up the reinstatement works.

This work will need to be carried out by contractors, as you can no longer spare the time to labour or manage because you need to get back to work to pay the mortgage which is now extended.

The loss adjuster’s reserve estimate works out considerably more than the build cost you actually insured the project for initially and despite the fact there is an uplift clause in the policy giving you some flexibility, you are badly underinsured and there will be insufficient funds to rebuild the property.

Simon Middleton is the face behind Protek Self Build, which provides site insurance and structural warranty products to the self build market. He has been operating in the self build industry for over 20 years.

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