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Three Pillars Of A Good Comp

Same Economic Neighborhood and Market Segment

A reliable comp sits in the same economic neighborhood as the subject property. This typically means the same subdivision, school district, and buyer pool, not just “somewhere nearby.” National guidelines and NAR materials consistently define comps as similar properties that have recently sold in the same area, because buyers substitute between those homes when deciding what to pay. Crossing into a different school zone, price band, or community type (starter homes vs. luxury, urban vs. rural) changes the demand dynamics and breaks that substitution logic. The more you can say, “A buyer considering this home would also seriously consider that one,” the better the comp.

Closely Matched Physical Characteristics

Fannie Mae, Freddie Mac, and the Appraisal Foundation all emphasize that good comps share similar physical and legal characteristics: lot and site, living area, room count, property type (e.g., single-family vs. condo), style (ranch vs. two-story), age, and overall condition. The goal is to minimize how many adjustments you need to make for size, quality, and amenities. When the homes are naturally similar, any adjustments are smaller and easier to support with market data, which makes the value opinion more defensible and less dependent on judgment calls.

Recent, Arm’s-Length Sales That Need Limited Adjustment

Strong comps are recent, arm’s-length transactions that reflect today’s market, usually closed within the last 3–6 months in a typical market (longer in thin or rural markets). They should be normal, open-market sales between unrelated parties, not foreclosures, short sales, or deals with unusual concessions, unless those are explicitly adjusted and typical of the area. Guidance from Fannie Mae and the Appraisal Institute stresses that each sale must be analyzed for the circumstances of the transaction and adjusted only based on demonstrated market reaction. A good comp, in theory, is one that would require few, well-supported adjustments to mirror your home.

Three Pitfalls Of A Bad Comp

Choosing Homes Simply Because They’re Nearby

One of the biggest mistakes people make is assuming any home “close by” is a good comp. But location isn’t just distance: it’s school districts, community reputation, amenities, traffic patterns, and even which side of a major road you’re on. Two homes a few streets apart can be in completely different price brackets. If buyers wouldn’t realistically compare the two when shopping, it’s not a good comp, no matter how close it is.

Comparing to Homes That Aren’t Similar in Size or Upgrades

Many homeowners accidentally pick comps that “look similar” but differ in the details that actually drive value. A newly renovated home isn’t comparable to one that hasn’t been updated in 20 years. A 2,200 sq ft home with a pool isn’t comparable to a 1,600 sq ft home without one. Even layout matters: single-story vs. two-story, open concept vs. older segmented floor plans. When the homes are too different, the comparison gives a false impression of what the market will pay.

Using Old Sales Prices or Special-Case Transactions

People often pull comps that sold a year or two ago, or worse, when the market was moving at a completely different pace. Another common mistake is using sales that weren’t normal market transactions, such as foreclosures, flips, or family-to-family deals. These sales don’t reflect true buyer demand and can distort your estimated value by tens of thousands. Only recent, arm’s-length sales give a realistic picture of what your home is worth today.

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   Jennilee  
 
 
 
 Trustindex verifies that the original source of the review is Google. I can’t say enough great things about my experience with Whitney and Red Penny! From the very beginning, everything was handled with such professionalism, care, and attention to detail. What really stood out to me was how smooth and stress-free the entire process was. He was always available whenever I had a question, incredibly responsive, and consistently kind. He genuinely cares about the people he works with, and that makes all the difference. If you’re looking for someone dependable and genuinely great to work with, I can’t recommend him and his company enough!
  
 
        
   Christopher  
 
 
 
 Trustindex verifies that the original source of the review is Google. More than anything I felt like he was trustworthy. He is a reliable guide that made making a huge decision in my life a whole lot less stressful.
  
 
        
   Nicole  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney at Red Penny Realty was the best! Such a professional and the absolute nicest guy ever. He is a wealth of knowledge and made the home buying process seamless. 10/10 would recommend to everyone I know!
  
 
        
   Elliot  
 
 
 
 Trustindex verifies that the original source of the review is Google. The home buying and moving process is one of the most stressful processes in life. Whitney @ Red Penny Realty made it seem like a cakewalk. I couldn’t recommend using him enough. Not only did he save us from buying a terrible home, but he also found us our dream home.
  
 
        
   Pamela  
 
 
 
 Trustindex verifies that the original source of the review is Google. I can highly recommend Red Penny realty to sell your home. Whitney recently sold a house for a family member and did an excellent job!  The house sold very quickly.  He is very knowledgeable about the real estate industry, was very responsive and went the extra mile to get the house sold!
  
 
        
   Tom  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney listed my mother’s house, and marketed the house before it was listed.  He had it sold within a few days. He was on top of everything throughout the process which all went very smoothly. We also had to deal with a solar payoff and reassignment which went well too. I would definitely use him again and highly recommend him to get the job done.
  
 
        
   S  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney listened to what we needed / wanted and then fought for us to get the best deal possible. He made the process so easy and we are grateful for our new home!  I would recommend hiring Whitney and Red Penny Realty without hesitation! SVT
  
 
        
   Melody  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney helped me buy a home in Desert Ridge! He did an amazing job negotiating all the details and I couldn’t be happier, I will recommend him again and again!
  
 
        
   Kelcie  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney was amazing! He is extremely knowledgeable, got us an amazing deal on our first house, and made the process so easy for us. Definitely recommend and will be using him for any future home purchases!
  
 
        
   Tyler  
 
 
 
 Trustindex verifies that the original source of the review is Google. Whitney went above and beyond helping my wife and I find our home. He was patient and paid attention to every little detail making sure the process was perfect. He was with us during the walkthroughs and asked questions. We got the best deal, thanks again Whitney!
  
 
  
  
 
 
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Once you have a number, the next question is what to do with it. See how we approach pricing and marketing, or dig into the live Mesa market data behind the estimate. Property records and assessed values are public at the Maricopa County Assessor.