Houston Home Square Footage: HCAD vs. MLS vs. Appraisal

A Houston house can be advertised as 2,700 square feet, show 2,100 square feet in the appraisal district’s records, and have an appraiser report yet another figure. That does not automatically mean someone made a mistake. But it does mean we need to understand what is being counted.

I run into this most often with older homes, additions, converted garages and properties with guest houses. Houston has plenty of all four.

The numbers may be describing different things

Harris Central Appraisal District, commonly called HCAD, maintains property information for tax appraisal purposes. The MLS may use a figure supplied from appraisal-district records, a builder, a measurement or another identified source. A lender’s appraiser has a different assignment and may have to apply specific measurement standards.

Those numbers should not be treated as interchangeable just because each one has “square feet” beside it.

Consider a Heights or Montrose home with 2,100 square feet in the main house and a finished 600-square-foot guest cottage behind it. The property may offer 2,700 square feet of finished space across two buildings. That does not necessarily make the primary residence a 2,700-square-foot house for appraisal purposes.

The cottage may have substantial value. It just needs to be identified and analyzed correctly.

A converted garage is not automatically living area

I also pay attention to garage conversions and additions, particularly in older neighborhoods such as Westbury, Meyerland and Oak Forest. A room may look finished and be useful to the owner, but the way it connects to the house, its condition, ceiling height and other characteristics can affect how an appraiser reports it.

A converted room is not worthless because it is reported separately. And a room is not automatically part of the main living area simply because someone installed flooring and air conditioning.

Why this matters when you are selling

Square footage changes how buyers filter homes and compare price per square foot. If the listing combines spaces that should be described separately, the property can appear larger than the homes buyers and appraisers are using for comparison.

Before listing, I would want to reconcile the appraisal-district record, any previous appraisal or floor plan, the actual layout and the source we intend to use in marketing. If there is a discrepancy, I would rather explain it clearly at the beginning than try to explain it after a buyer’s appraisal comes back.

Why this matters when you are buying

If the size of a home is central to your offer, verify it while you still have time to act on the information. Ask where the listing figure came from. Look at the floor plan. If the numbers conflict or the layout is unusual, consider having the home professionally measured during your contractual due-diligence period.

And remember that price per square foot is a comparison tool, not a valuation formula. A well-renovated 2,100-square-foot house with a useful guest cottage may be worth more than a larger house with a poor layout. The market determines how much that difference matters.

My rule: describe the property you actually have

The right description separates the main residence, guest quarters, garage apartments and other finished areas when appropriate. Buyers get a clearer picture. Sellers can defend the property’s value with better information. And the transaction has fewer surprises.

In Houston real estate, the details are often where the value lives. I would rather have a well-supported explanation than one impressive number.

I’m Susan McKinney, Broker and Co-Founder of League Agency. Longtime Houston clients may know me as Susan Brock, and our brokerage was previously Brock and Foster Real Estate. My work is helping clients make decisions with accurate information, especially when a property is not as simple as the listing sheet makes it look.

You can review my background and Houston real estate work on my HAR profile or visit League Agency.

Useful reader links

HCAD property search: https://hcad.org/property-search/property-search

Fannie Mae measurement and ADU guidance: https://selling-guide.fanniemae.com/sel/b4-1.3-05/improvements-section-appraisal-report

Susan McKinney HAR profile: https://www.har.com/susan-mckinney/agent_susan

League Agency: https://www.leagueagencyre.com/