Ideally, appraisers want to use sales of properties of the same size, age, room count, condition and with similar amenities and external influences. This rarely happens though, so adjustments have to be made, based on what people will pay extra for. To help get a better picture, this information is entered on a form, a value for differences is established and comparisons are made to the subject property. A minimum of three verified closed sales with photos are required to establish a value. Additions are done with the proper building permits.
Additions conform with and fit well into the existing house.
You can change everything about a house except it' s location. Under an airport flight path. In or near a gang territory. In a rundown block or neighborhood. Next to a school or school yard playground.