House Measuring – Part 3 of 3

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House Measuring Explained by the Pros

(If you don’t find the information you need on this topic, PLEASE comment at the end of the article and we will do our best to answer your questions!)

In the first article in this 3-part series, (Determining the Square Footage of a House – Part 1 of 3), we discussed the most basic aspects of measuring a house. We covered measuring a house that is a simple rectangle without a garage, and illustrated the difference a slight variation in the length of one wall might make when calculating square footage.

In article 2 (Square Footage of a House – Part 2 of 3) we reviewed how to measure a house that is slightly more complicated than a basic rectangle. We also showed how to calculate the square footage of a house that is a rectangle plus an additional space. At the bottom of that article, we listed property attributes (oooh – property properties!) that are or are not considered to be square footage for the purposes of an appraisal (i.e., basements, other spaces such as a storage closet in a garage). We also discussed attributes that may not necessarily contribute square footage but may still contribute value – which is not the same thing.

In this post, we’ll talk about measuring more complicated houses, including 2-story houses with and without great rooms (vaulted spaces).

Review: The Steps for How to Measure a House

The summary of the steps for determining the square footage of a house are:

  1. Measure the exterior of the first story
  2. If the second story (third, etc.) aren’t the same “footprint” as the first floor, measure the interior of the second story, adjusting for thicknesses and open spaces (open staircases, vaulted rooms, etc.)
  3. Remove spaces that don’t count as interior living space
  4. Add it all up

Measuring Houses: The Big Boys

If you read the first article in this series, you understand the basics of simple house measuring.

By now you may be squawking about when we’re going to get to the good stuff. Well, right about now.

Measuring 2-Story Houses

The easiest 2-story house to measure is the one where the second story has the exact same footprint as the first story - you can tell this by just looking at the outside and the inside. In this case, the size of the second story is the same as the first (which you measure from the outside), minus the open spaces. An open space is the space that you can’t actually walk on – like the open area at the top of a staircase, or the open space above a great room with a high ceiling. It can be tricky to figure out how to measure these spaces, even in this simple example.

For the open space at the top of the staircase, study it until you figure out spots from which you can measure, and draw it out on a piece of paper as you measure. Calculate the size of this space and subtract it from the size you started with as your second story calculated size (remember – in this example the second story is the same size as the first story, which you already figured out). You can do the same with the open space above a great room or a vaulted space. You may have to measure the space of the great room, below the vaulted space on the first floor, or get creative to figure out how to cancel out this space.

An important thing to remember is that open spaces are not counted as square footage for the home.

simple-2-story-house
simple-2-story-house-calculations

When the Second Story is Not Easily Measured

Frequently, the second story of a home does not have the same footprint as the first story. These houses often do not have second floors that are easy to measure. These are the ones that when you drive up to them, you see interesting roof lines, dormers, turrets, or other spaces on the second story that aren’t going to be easy to measure.

We take another swig of coffee and call home to say we’ll be late for dinner!

Second stories that are not the same footprint as the first floor are measured from the inside. Remember that when we measured the first floor, we measured from the outside. In order to compensate for measuring the second story from the inside, we need to add an incremental amount to compensate for the thickness of the exterior and interior walls. The amount we add depends on what is on the exterior of the second story – masonry, stone, hardiplank, etc. This amount averages about .85 feet, or 10.2 inches, if the space ends at an exterior wall, and about .46 feet if it ends at an attic space. Make sure to add the right amount to both ends of your measurement.

Ah, another point of interest – although regular measuring tapes uses inches and feet, appraisers measure spaces in tenths of a foot. Whenever possible, we use a Disto laser measuring device to ensure that our measurements are as accurate as possible.

You will need to make a careful diagram, and mark your measurements as you go. If it doesn’t seem to be adding up, re-measure until you’re sure you have it right. You may need someone else to hold the other end of the tape to keep it level and to keep it from sagging.

Complex-2-Story House
Complex-2-story-calculations

House Measuring Summary


From here on out, unless you really really like geometry, you will get the best results by using specialized software to calculate the size of a house that you measure.
Unless you can easily break the footprint of the house up into squares, rectangles and right-angle triangles, it gets complicated and tedious, fast.

We like that the program we use, DaVinci by RapidSketch, will show us where we may have mis-measured (no, that never, ever happens!), because the spaces just don’t line up the way we expect them to. Fortunately, most mistakes like that are captured on-site because we use graph paper to make our original on-site sketch of a house.

We hope you learned something from this series of articles on how to measure a house. If we missed something, please comment below and we’ll try to address your questions.

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Independent Real Estate Appraiser in Austin, Texas: Travis, Williamson, Hays, Bastrop and Caldwell Counties