Keep the second reason in mind: That should you have a future claim regarding damage to the home (hail damage, fire, etc.) and the insurance company discovers that an unsafe condition existed that was not disclosed, they could possibly deny any claims.

And third: When you sell the home, since you are aware of the the lack of permits, you would be required by law to disclose that fact to a new buyer, who may ask for reparations prior to concluding the purchase. And could walk away from the deal should you refuse. This is nothing to be taken lightly. It is serious.

Now to your original question. Should you have the work permitted simply to increase the value of the home? If that is the only reason, and you are comfortable with the safety of the additions and plan to live in the home, well, forever, then no. First of all, increasing the value of your property will likely result in higher property taxes. Second, governing authorities tend to dislike people doing additions without permits when those are required. This would be additions that require gas, electric and/or structural features, at a minimum. Some jurisdictions may require more.

And when a governing authority is asked after the fact to simply issue permits, I guarantee they will inspect the work done to determine if it was done according to code. This may require removal of sheetrock or other elements so that they can actually view the work. So, this could add up to quite a lot of money.

Why, do you ask, would they do that? Well, work can be done in such a way that it can pose a risk, to the family, perhaps even to neighbors.

In one home that my buyers had under contract, I inquired about permits and found that none were pulled. It was found that the basement bathroom addition (which was touted as an newly added feature in the listing) had several problems, some plumbing and some structural, and the entire bathroom had to be removed and replaced according to code before my buyers would move forward on the contract.

In another, a neighbor had an EV charging unit installed in their garage by a friend. Within a day, there was a short and a small fire was started in the attic. It spread to the entire house, and even neighbors had to be protected. When restorative work was started, asbestos was found, and the remediation for that alone required extensive work. The entire home was gutted for restoration, and the owners had to live in a rental for over a year.

It was good that you asked this question, and you should ask more before you make a decision. And if you have any work done to your home, always either hire a competent contractor or inquire with the building department whether permits might be necessary. If they area, ALWAYS have the work permitted and inspected. While homeowners are, in many jurisdictions, allowed to do even licensed work on their own, it is always safest to hire licensed contractors.

Good luck.