When planning construction costs for your house flip, you need to decide in advance whether you need a construction permit or not. Pulling permits requires opening your property up to an inspector who might ask you to bring many areas of your home “up to code.” This adds extra expenses to your renovation. On the other hand, not getting a permit might result in retroactive changes to the areas you’ve already completed. As the result, not only your costs increase, you might also experience major delays. One of the worst mistakes a rehabber can make is to plunge in the house flip process without carefully considering whether to get a construction permit or not.