Who Actually Determines What Your House Is Worth?

Quick Answer

It depends on what the number is for. A licensed appraiser sets the value lenders use (typically $450–$700, ordered during a loan or sale). A real estate agent's comparative market analysis (CMA) sets a listing price — and is free. Online estimates from websites are computer models: instant, free, and often off by 5–10% or more. The county assessor's number is only for property taxes and usually far below market value in California. Selling? Start with the free CMA. Getting a loan? The appraisal decides.

Four numbers, four different questions

Every valuation method is built for a specific customer. The appraiser answers the lender's question: "is this house worth enough to secure the loan?" The agent answers the seller's question: "what price will attract a buyer in the next 30 days?" The website answers a browser's question: "roughly what neighborhood of value are we in?" And the county assessor answers exactly one question: "what do we tax?" The same Whittier house could reasonably show $560,000 on the tax roll, $795,000 on a website, and $825,000 in both the CMA and the appraisal — and every one of those numbers is doing its job.

The licensed appraisal — the official one

An appraiser is state-licensed, independent, and paid a flat fee for an opinion of value — typically $450 to $700 for a standard single-family home, more for larger or unusual properties. They walk the property, measure it, photograph it, and compare it against recent nearby sales, adjusting for differences. The result is the number lenders lend against. You need one when:

• A purchase or refinance loan is involved — the lender orders it (you pay for it in your loan costs), and you don't get to pick the appraiser.
• An estate needs a date-of-death value for tax basis, or a probate sale needs a court-recognized number.
• A divorce or family buyout needs a figure both sides will accept as neutral.
• You want to remove mortgage insurance and need to prove your equity to the lender.

Outside those situations, paying for an appraisal to decide a listing price is usually unnecessary — the free CMA below covers it.

The agent's CMA — free, and built by hand

A comparative market analysis is an agent studying what has actually sold near you in the last few months — same bed and bath count, similar size and lot, same school boundaries — and adjusting for what makes your house different: the remodeled kitchen, the ADU, the busy street. It's the same basic logic an appraiser uses, done by someone whose job is to price homes so they sell. Agents provide CMAs free because it's how sellers evaluate them; there's no obligation attached to asking. If you're within a year of possibly selling, this is the number to get first — and to refresh before you list, because a CMA has a shelf life of a few months in a moving market.

Online estimates — instant, free, and blind

The instant estimates on real estate websites are automated valuation models — computer programs crunching public records and recent sales. They're genuinely useful for ballparks and for tracking direction over time, and we offer one ourselves. Their blind spot is condition and detail: the model doesn't know your roof is new, your neighbor's identical floor plan is a gut-job flip, or your "4th bedroom" is a converted garage the county never saw. On uniform tract homes the models do respectably; on older, remodeled, or unusual properties — most of what LA County is made of — they can miss by tens of thousands in either direction. Treat the number as a starting point for a conversation, never as a price.

The tax bill number — ignore it for selling

The assessed value on your property tax bill is a legal artifact, not a market opinion. Under Proposition 13, California reassesses a home to market value when it sells, then caps increases at 2% a year no matter what the market does. Own a home for 20 years and the taxable value drifts far below what buyers would pay — which is exactly the point of the law. It works in reverse too: a recent buyer's assessed value sits close to what they just paid. Either way, no buyer, appraiser, or agent uses assessed value to price a home, and neither should you.

Who pays for the appraisal in a sale?

The buyer, almost always — it's part of their loan costs, since their lender is the one requiring it. As a seller you don't order or pay for the buyer's appraisal, but its result affects you: if it comes in under the contract price, the deal gets renegotiated or the buyer covers the gap.

Can I get a free home valuation with no strings attached?

Yes. An online estimate takes seconds, and a CMA from an agent is a standard free service — it's how we earn the chance at your listing, and you're not committing to anything by asking. The only valuation that should ever cost you money is a licensed appraisal, and you only need that in specific loan, estate, or legal situations.

Why is the website's estimate so different from what my neighbor's house sold for?

Usually condition or data the model can't see. Two identical floor plans can sell $80,000 apart because one was remodeled and staged and one wasn't — the computer records both as the same house. Unpermitted additions, lot differences, and even which side of a school boundary you're on all move real prices in ways public records don't capture.

How often should I check my home's value?

If selling isn't on the horizon, once or twice a year is plenty — it's mostly useful for tracking your equity. If you're within a year of a possible sale, get a real CMA now and refresh it within 60 days of listing; Southern California pricing can move meaningfully inside a season.