Finishing Basements

While finished basements can add value, the amount of value is less than it is for above-ground living areas. In addition, this greatly varies depending on different regions of the country. In humid areas, below-ground living space isn’t as valuable to homeowners as in dryer areas of the country. Thus, the American National Standards Institute (ANSI) uses above-ground construction as the national standard for comparing values. Sometimes homeowners refinish basements (or add other space) without obtaining proper building permits from the county. Be sure to check public records to see if the finished square footage represented by the seller matches the county’s file.

Rule of Thumb

As a general rule of thumb, a basement’s value can be calculated roughly by using the following formulas:

  • Unfinished square footage = approx 25% of above ground space (depends on ceiling height, style, etc)
  • Finished square footage = approx 40% of above ground space (depends largely on quality of finish)

Thus, for example, if you have a 1,000 square foot ranch without a basement that’s worth $100,000, then the same house with a 1,000 square foot unfinished basement should be worth about $125,000 .  If the basement were finished, then the entire house would be worth approximately $140,000.  As you can see, finishing a basement on a house this size is often not worth the effort, since it won’t yield more value.  However, if is to be a rental property, then adding bedrooms could be worth the effort because you will get more rent.

“Non-Conforming” Bedrooms

In some part of the Country, a basement bedroom is illegal, period.  In other areas, they are allowed if there are “egress” windows (big enough for a fireman with a tank to get in/out of).  If you have a basement bedroom with the old, small windows, then some areas will called this “non-conforming”, which means they are grandfathered in for the purpose of use, but cannot be considered in the bedroom count for appraisal purposes.  Thus, a house with 2 bedrooms on the main floor and 2 non-conforming bedrooms in the basement will appraise as a 2 bedroom with a finished basement.  On the other hand, if legal in the area, it would rent as a 4 bedroom house.

Consider local laws, building codes, and general health and safety issues when adding, finishing, or renting bedrooms in a basement area.  In most cases, if you refinish or add bedrooms or bathrooms in a basement, the entire basement must be brought up to new code.  In short, don’t play guessing games – consult with a local contractor or other expert familiar with local building codes.

Finally, check your liability insurance policy – they may exclude coverage for basement apartments, particularly if renting them is against local code. The only thing more tragic than a family injured in a house fire is having no coverage for the claim.

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About the Author Attorney William Bronchick

Attorney William ("Bill") Bronchick, the host of, has authored six best-selling books and is sought nationwide for his 30+ years of real estate and legal knowledge. He has been interviewed by numerous media outlets, such as CNBC, TIME Magazine, USA Today, Investor Business Daily, Forbes, and the LA Times, to name a few. William Bronchick is the co-founder and past President of the Colorado Association of Real Estate Investors and the President of the Colorado Landlords Association. Click on the "About" link above for more information on William Bronchick.

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