Check inside your homeowners policy. Some companies let you and others will get really annoyed with you and possibly cancel your policy. When you first made the claim you must have gotten estimate for how much the work will cost and that's how they come up with the amount to give you in a check. Now if you go and do the work your self at half the cost then you make out on the deal and I don't know any insurance company that likes that . I would err on the side of caution on this one and look in the policy and or call them and honestly ask.