I dont mean just listing it on an appraisal, i'm talking about having a adjustment to the value because of a shed, or the lack of one. I'd be amazed if that was ever done on any small shed, regardless of permitting/tax status.
An increase in assessment or property taxes doesnt mean that it will increase the value of a home.
Perhaps a few details of where I live will help you to understand what I am talking about when I said yes, having a shed does add to the property both in the assessed value and the actual value as witnessed by the selling price of homes near me with one versus without one.
Most of the homes in my township were built between 1950 and 1965, are two story dwellings that are approximately 2000 sqft and sit on 3/4 acre lots. My town is 2 square miles in area and there are no more empty lots here, and no homes were built after 1985. So any homes with things like central air conditioning, finished basements and upgraded kitchens and bathrooms sell for more because those things always add not only to the assessed value but to the actual value of a property. But what also makes them have higher assessed values and actual values is having a patio, deck, paved driveway and yes even a shed/outbuilding.
Why do the last 4 items I mentioned above add both assessed and actual value? Because the area that I live in is zoned what is called "VRC", which stands for Very Restricted Construction. This not only restricts how large a home can be, but more specifically how much ground that can be covered with impervious surfaces. That is due to wanting to keep a more rural aspect to the area. Currently the percentage of impervious surface that can be covered on any property is 15 percent, which was lowered from the original 25 percent back in 1985 when the last home was built here.
Because things like patios, decks, paved driveways and sheds/outbuildings all add to the impervious surface percentage, any home in this area with those items already on the property are more in demand than the homes without them because all the properties are at or above the 15 percent coverage allowed.
Most buyers looking for a home want some, or even all of those things and they will pay more for the homes that have them than a home that does not, especially if the potential buyers are told they will never be able to have those things due to the property already being at or above the 15 percent coverage.
Even a lowly wooden shed now adds to both the assessed and overall value of a property because most of the homes here don't have one and can't put one in even if they wanted to. I was able to put in my shed with a special use variance because my property was just under the allotted impervious surface percentage. So I was lucky that I could put in my 10x16 shed, as that was the largest I could build to remain just at the 15 percentage coverage.
That is why I said to you before that it all depends on where you live as to whether or not something like a shed can add not only assessed value, but actual value to your property. As for where I live it definitely does.
Jim