It is true that my viewpoint does tend to exclude warm and fuzzy, and equally true that warm and fuzzy is a primary factor for a lot of people. There are some people who thrive on home improvement projects. My comments were strictly in terms of cost vs. value, and assuming the use of professionals to perform all the design and labor.
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lido,
If a property owner does do an addition their home would be subject to reassessment. A new assessed value may only increase by the “cost” of the addition but it most likely won’t be the same. Still, an original assessment at $200k + a $100k addition is a lot less than a $600k purchase price.