Friday, July 27, 2012

How to Measure Your Home's Square Footage | Zillow Blog

One of the most confusing and misleading metrics in the home building and home selling business is area?? the ?size? of a house.

The problem is that there?s no adopted standard; everyone measures it differently. There has been a move in the past few years to create a universal standard like the one architects use (specified in AIA contracts), but it isn?t mandatory and isn?t yet widely used.

Many state boards of real estate specify a process to measure house area, but it?s a recommendation, not a requirement. So ?house area? means different things to different people.

The one thing that is always true is that area is never measured from the inside of the walls; the area of a house always includes all wall thicknesses interior and exterior.

Gross area

Not surprisingly, builders and real estate agents often want to show the largest number they can, so they sometimes measure the entire perimeter of the house on both floors. They may or may not include porches, stairs and two-story spaces. Because you don?t know their basis, it can be very hard to compare one house to another.

A relatively impartial source is your county auditor or assessor. They calculate the size of the house for tax purposes and therefore measure all houses the same way. And although their measurements aren?t always a true reflection of the size of the house, they use the same protocol, so it?s easier to compare one house to another.

But county records show only the gross areas contained within the perimeter of the foundation, which doesn?t accurately reflect the ?livable? space within.

Defining separate spaces

A better way is to list areas separately, rather than combining them into one number; that?s the way we calculate areas at our office:

We first measure the perimeter of the house at the exterior wall sheathing?? not the siding or brick, just the framing?? on both floors.

Next we subtract the upper part of any two-story spaces and deduct the area of stairs on the second floor (they?ve already been counted on the first floor).

Spaces that are less than 6 feet high aren?t counted in the ?main? number (areas with sloped ceilings). Instead, we list those areas separately.

In fact, we show a listing of square foot areas that lets you know where the areas are being counted from, something like this:

First floor: 1,500 square feet
Second floor: 1,000 square feet
Subtotal heated areas: 2,500 square feet
Finished basement: 800 square feet
Total heated areas: 3,300 square feet

Screened porch: 200 square feet
Open porches: 200 square feet
Garage: 600 square feet
Total unheated areas: 1,000 square feet

To simply say that this house is 3,300?square feet or 4,300 square feet, or 4,700 square feet (if you include upper volumes and stairs) would be misleading. It?s more informative to say it?s a 2,500-square-foot house with a screened porch, garage and finished basement.

The best you can do right now (other than measuring it yourself) is to ask the builder or selling agent their basis for measurement. You need to know exactly what?s included in that number if you?re comparing homes based on size.

Related:

Richard Taylor is a residential architect based in Dublin, Ohio, and is a contributor to Zillow Blog. Connect with him at http://www.rtastudio.com/index.htm.

Note: The views and opinions expressed in this article are those of the author and do not necessarily reflect the opinion or position of Zillow.

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Source: http://www.zillow.com/blog/2012-07-25/how-to-measure-your-homes-square-footage/

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