What is your Houston home really worth? A custom market analysis vs. an online estimate
An online estimate is a fast starting point. A custom market analysis looks at your actual home against what has really sold nearby. Here is how they differ and when each one helps.
An online home estimate, such as Zillow's Zestimate, is a computer-generated value built from public records, MLS data and user-submitted facts. Zillow itself says it is not an appraisal and suggests supplementing it with a comparative market analysis (CMA) from a real estate agent. A CMA is an agent's opinion of value based on recently sold, active and pending homes, adjusted for your home's condition, updates and location. In Texas, sale prices are not recorded in public records, which makes access to local MLS sales data important. Neither a CMA nor an online estimate is an appraisal.
Details checked October 24, 2026. Rules, programs and numbers change, so verify with the source before you rely on them.What an online estimate does well, and where it struggles
Online estimates are free, instant and good for tracking a general direction. Zillow describes its Zestimate as a "free starting point" built from county and tax assessor records, MLS feeds, home characteristics such as square footage and bedrooms, listing data and market trends.
The limits are built into how the tools work:
- They do not see inside your home. Zillow notes that unreported additions, updates and remodels are not reflected in the Zestimate, and that cosmetic updates may not change it.
- They look at a wider area. Zillow says it uses data from a geographic area much larger than your neighborhood, up to the size of a county, to calculate the Zestimate. A custom analysis can focus on your street and subdivision.
- They depend on the data available. In Texas, final sale prices are not recorded in public county records, which Redfin describes as the reason accurate valuations lean on MLS data and local agent knowledge.
What a custom market analysis looks at
A comparative market analysis (CMA) is prepared by a licensed real estate professional and most commonly used to help set a listing price. A good one usually includes:
- Recently sold homes similar to yours, pulled from MLS data that shows actual closed prices.
- Active and pending homes that you would compete with if you listed today.
- Adjustments for size, condition, updates, lot and location, made after seeing the home in person.
- A price range with the reasoning behind it, so you can decide on a list price together.
In the Houston area, details that vary street by street can matter to a buyer: a flood history or floodplain location, drainage, a municipal utility district (MUD) tax rate, HOA fees, and the age of the roof, AC and foundation work. Sellers in Texas disclose several of these on the TREC Seller's Disclosure Notice, so a CMA should take them into account honestly.
CMA vs. online estimate vs. appraisal
| Online estimate | Custom market analysis (CMA) | Appraisal | |
|---|---|---|---|
| Prepared by | Software (an automated valuation model) | A licensed real estate agent or broker | A licensed or certified appraiser |
| Built from | Public records, MLS feeds, home facts and market trends | Comparable sold, active and pending homes plus a look at your home | Comparable sales and the property's condition, for a written opinion of value |
| Typically used for | A quick starting point and tracking trends | Setting a listing price and planning a sale | Lenders valuing the home that secures a loan |
| Limits | Cannot see updates or condition; larger geographic area | An opinion of value, not a guarantee of what a buyer will pay | Ordered for a specific purpose, and usually not a pricing strategy |
Descriptions are general and based on the Zillow, NAR and CFPB pages in the sources list.
Why the difference matters when you sell
Price is the first thing buyers compare. If you rely only on an online number, you may overlook a kitchen update that adds appeal, or a busy street or flood history that buyers will weigh heavily. A CMA lets you and your agent test those factors before you list, and revisit them if the market responds differently than expected.
Keep in mind that a buyer's lender will order its own appraisal on most purchase loans. If an appraisal comes in differently than the contract price, the parties may need to renegotiate. That is one more reason to treat any value, including a CMA, as an informed opinion rather than a promise.
What to gather before a market analysis
- A list of updates with approximate dates (roof, AC, water heater, flooring, kitchen, bathrooms).
- Any permits, warranties or receipts for major work.
- HOA and MUD information, if applicable.
- Your survey, if you have it, and any flood or insurance claim history you know of.
- Your goals and timeline, so the analysis can reflect them.
Ready to start? Request a free home value, read how selling works, or see whether to sell as-is or fix it up first. More guides are under Resources.
Frequently asked questions
Is a Zestimate or other online home estimate accurate for Houston?
It can be a useful starting point, but accuracy varies with how much reliable data exists for your home and area. Zillow says the amount of data on your home and nearby homes directly affects accuracy, and it publishes accuracy statistics by region on its Zestimate page. Check those, then compare the number with a CMA that reflects your home's real condition.
What is a comparative market analysis (CMA)?
A CMA is prepared by a licensed real estate professional and is most commonly used to help set a listing price. It compares your home with active and sold competition and is meant as a guide for you and your agent, not the only factor in pricing, according to the National Association of REALTORS®.
Is a CMA the same as an appraisal?
No. An appraisal is prepared by a licensed or certified appraiser and is the valuation lenders most often rely on for purchase loans. A CMA is an agent's opinion of value. NAR notes a CMA should not be the sole method of valuing collateral when a mortgage is being originated.
Why does Texas being a non-disclosure state matter for home values?
In Texas, the final sale price of a home is not recorded in public county records, so exact sold prices are generally visible only to the parties involved, their agents and people with access to MLS data. That makes local MLS access important for a CMA and can make it harder for online tools to see recent sale prices.
Is my county appraisal district value the same as market value?
Not necessarily. Appraisal district values are used for property taxes. Redfin notes that in many non-disclosure states, tax assessors rely on property characteristics rather than sale prices, which can leave assessments different from market value. A CMA built on recent sales is aimed at what a buyer may pay today.
Sources
Checked October 24, 2026. Links go to the original publisher.
- What is a Zestimate? (Zillow)Used for: Zestimate inputs, not an appraisal, unreported remodels not reflected, data from areas up to county size, Zillow's suggestion to request an agent CMA, accuracy data by region.
- What Are Non-Disclosure States in Real Estate? (Redfin (Nov. 19, 2025))Used for: Texas is a non-disclosure state; sale prices are not publicly recorded; reliance on MLS data, CMAs and appraisers; tax assessments can differ from market value.
- Making Sense of Valuation's Alphabet Soup: CMAs, BPOs, AVMs and Appraisals (RISMedia, content provided by NAR's Center for REALTOR Development (Jan. 9, 2019))Used for: Definitions of a CMA, AVM and appraisal; a CMA is a pricing guide and not the sole collateral valuation for a mortgage.
- What are appraisals and why do I need to look at them? (Consumer Financial Protection Bureau)Used for: An appraisal is a written opinion of value; lenders may require one; you are entitled to a copy no later than three days before closing.
- Seller's Disclosure Notice (TREC OP-H) (Texas Real Estate Commission)Used for: Houston factors that appear in disclosures: flood history, floodplain location, drainage, repairs, HOA or maintenance fees.
Want a custom market analysis of your home?
Tell me about your home and I will prepare an analysis based on comparable sales, condition and current competition. It is an opinion of value, not an appraisal, and I do not promise a sale price.
General information only, not legal, tax, financial, lending or insurance advice. Mr. Wright is a real estate sales agent, not a lender, attorney or tax adviser. No price, savings, approval or outcome is promised. Details as of October 24, 2026.
