Real Estate Appraiser: What They Do and How to Hire One

Real estate appraiser: what they do and how to hire one

A real estate appraiser is the licensed professional who walks through a property, gathers measurable data, and turns that data into a written opinion of market value. Lenders, buyers, sellers, and attorneys rely on that opinion to size up a mortgage, settle an estate, challenge a tax bill, or close a refinance. The appraiser’s report sits quietly in the middle of some of the largest financial decisions a household will ever make, which is why the role is closely regulated, even though many people only meet one once.

Homeowners and buyers often run into the word “appraisal” without a clear picture of the work behind it. This guide explains who real estate appraisers are, what they actually do during an assignment, how their work connects to lending rules, and what to check before you hire one directly. It is written for readers who want a practical understanding of the process, not a sales pitch for any particular firm or service.

What a real estate appraiser actually does

At its core, appraisal is the practice of forming a supported opinion of a property’s market value as of a specific date. The “market value” definition appraisers use is not casual. It is drawn from professional standards that require the opinion to reflect what a willing buyer would pay a willing seller, neither under duress, with reasonable marketing time, and with both parties reasonably informed.

To arrive at that opinion, the appraiser combines three standard approaches:

Sales comparison approach. The appraiser identifies recent sales of similar properties in the same or nearby market, adjusts those sales for differences in size, condition, features, and location, and reconciles the adjusted values into a primary value indicator. For most single-family homes, this is the most influential approach.
Cost approach. The appraiser estimates the cost to replace the structure as of the effective date, subtracts accrued depreciation, and adds the value of the land. This approach is most useful for new construction, unusual properties, and insurance-related valuations.
Income capitalization approach. The appraiser analyzes the property’s net operating income and applies a capitalization rate derived from market data. This is the dominant approach for rental and investment properties of two to four units and above.

The final reconciled value is then placed in a written report that describes the property, the neighborhood, the market, the data used, the analysis performed, and the assumptions supporting the opinion. The report is a legal document, not a marketing flyer, and is signed by the individual appraiser who inspected the property or personally supervised the inspection.

Why lenders require an appraisal

For most mortgage loans, the lender cannot use its own estimate of the property’s value to make a safe lending decision. Federal lending rules require that the loan-to-value ratio be calculated using an independent opinion of value performed by a licensed or certified professional. The institution that coordinates this independence is called an appraisal management company, or AMC, which acts as an intermediary between the lender and the appraiser.

This separation exists because of a long history of lending problems in which pressure to close loans produced inflated values. Federal regulation, including Regulation Z updates and Title XI of the Financial Institutions Reform, Recovery, and Enforcement Act of 1989, created the framework that pushes lenders to order appraisals through independent channels and hold appraisers to professional standards.

For a typical home purchase or refinance, the borrower pays the appraisal fee as part of the closing costs, but the lender selects the appraiser through an AMC. The borrower does not get to choose the individual appraiser in a routine transaction, although the borrower can refuse the appraisal, request a reconsideration of value with additional comps, or appeal the result through the lender’s process.

Licensing levels and what each one can sign off on

Real estate appraisers are not a single license category. In most U.S. states, the licensing system follows the federal framework set by the Appraisal Qualifications Board and is administered at the state level. For example, the California Bureau of Real Estate Appraisers oversees licensing and certification in California and is responsible for accrediting the education providers that aspiring appraisers must attend. Other states run equivalent programs under their own real estate appraiser licensing laws.

The common tiers are:

License level	Typical experience	Typical property types	Common use
Trainee / Registered	Working under a supervising appraiser; education requirements vary by state	Residential and sometimes limited commercial, only with supervision	Learning the trade and assisting on reports
Licensed Residential	Education plus experience hours, as defined by the AQB and the state	Non-complex residential properties of one to four units	Standard home purchase and refinance appraisals
Certified Residential	More education and experience than the licensed level	Residential properties of one to four units, including higher-value homes	Larger or more complex residential assignments
Certified General	Additional education and broader experience requirements	All real property types, including commercial and land	Income-producing, commercial, agricultural, and special-use properties

The state license held by the appraiser determines which assignments they can accept. A licensed residential appraiser cannot sign a commercial appraisal in most jurisdictions, and a certified general can handle assignments that a residential-only credential cannot.

What happens during the property inspection

The on-site inspection is the most visible part of the assignment, and it is only one step in a longer process. Before the visit, the appraiser has usually reviewed the public records for the subject property, pulled tax data, identified potential comparable sales, and looked at the neighborhood and market context. The inspection is where the appraiser confirms what the records say and gathers the data the records cannot show.

A typical inspection covers:

Exterior condition, including roof, siding, foundation, and grading
Interior condition, including walls, floors, ceilings, kitchens, and bathrooms
Functional layout, room count, and overall livable area
Major systems that affect value, such as HVAC age and overall condition
Visible safety or code issues, such as exposed wiring, missing handrails, or signs of water intrusion
Site features that affect value, such as parking, views, easements, or outbuildings

Appraisers measure the property to confirm or correct the square footage shown in public records. They photograph the exterior and the interior, and they may take notes on small details that affect value, such as a finished basement, an unpermitted addition, or a kitchen that has not been updated in decades. The inspection typically takes 30 minutes to an hour for a typical single-family home, and the appraiser is usually working alone.

How appraisers choose comparable sales

Comparable sales, or “comps,” are the recent transactions the appraiser uses to support the sales comparison approach. Choosing the right comps is one of the most consequential parts of the work. A good comp is a recent sale of a property similar to the subject in location, size, age, condition, and features, and it should have been an arm’s-length transaction.

Appraisers look for sales within a defined time window, usually the last 6 to 12 months, with closer weight given to the most recent sales. They prefer sales inside the subject’s neighborhood or subdivision, but when the local market is thin, they will extend the search to comparable competing neighborhoods. The selection is documented in the report with a brief explanation of why each comp was chosen and how it was adjusted.

Common adjustments include differences in gross living area, lot size, room count, garage spaces, condition, and location. The data sources appraisers use to support these adjustments include local multiple listing services, county records, and proprietary databases maintained by appraisal software vendors. Adjustments are supported by market data, not by personal opinion, and they are reconciled into a final indicated value range.

The written report: what is in it and why it matters

Once the inspection and analysis are complete, the appraiser prepares a written report. There are several standard report formats, ranging from a short form for straightforward residential assignments to detailed narrative reports for complex or commercial work. The most common residential form includes the following sections:

Section	What it contains	Why it matters
Subject property summary	Address, legal description, lot size, gross living area, room count, and year built	Establishes the physical asset being valued
Contract and sale history	Current purchase contract, prior sales within a defined look-back period	Confirms the price being tested against value
Neighborhood and market conditions	Description of the area, market trends, supply, and demand	Places the property in the right market context
Site and improvements description	Physical description, condition rating, and any functional or external issues	Supports the condition adjustments in the analysis
Sales comparison grid	Subject and three to six comps, with adjustments and adjusted values	The core numerical support for the value opinion
Reconciliation	Final value opinion and the weight given to each approach	The bottom line, supported by the data above

For most home loans, the lender and the borrower receive a copy of the report. The borrower has the right to receive a copy upon request, and the AMC is required to provide it. Reading the report carefully, especially the comps and the adjustments, is one of the most useful things a borrower can do before accepting the value or deciding to challenge it.

Common reasons an appraisal comes in low

A low appraisal is a routine event, not a rare one. It happens when the appraised value is below the contract price or below the loan amount the lender needs to underwrite. When this happens, the buyer, seller, and lender have to decide whether to renegotiate, change the loan structure, dispute the value, or walk away.

Common reasons include:

Use of poor comps that do not reflect the subject’s actual condition or location
Market changes that have not yet been captured in recent sales
Overpricing by the seller relative to the comparable sales
Condition issues noted in the report, from deferred maintenance to functional problems
Data entry errors, such as wrong square footage or an incorrect site size

For most loan types, borrowers have a formal reconsideration of value process. The borrower or the real estate agent can submit additional comps, point out factual errors in the report, or document recent upgrades that were not reflected. The appraiser is required to consider the new information, although they are not required to change the value. Independent of the lender process, the California Bureau of Real Estate Appraisers provides information on the licensing framework that governs how appraisers are supervised, including the role of the Uniform Standards of Professional Appraisal Practice.

When you hire an appraiser directly

Most consumers encounter appraisers through a lender. In a few situations, however, a homeowner or business owner needs to hire an appraiser directly:

Pre-listing valuations before putting a home on the market
Estate settlement, including date-of-death valuations for inherited property
Divorce or partition, where the parties need an independent value
Property tax appeals, when the owner believes the assessed value is too high
Financial reporting, when a lender requires an appraisal outside the standard loan process
Litigation support, where a credible value opinion is needed for a legal dispute

When hiring directly, the engagement looks different from a lender-ordered assignment. The client chooses the appraiser, the client pays the appraiser, and the appraiser’s client is the person or entity that engaged them, not a lender. This is a meaningful change, because the independence rules that apply to lender-ordered work do not apply in the same way.

How to choose the right appraiser for a direct hire

Choosing an appraiser for a direct engagement is a vetting exercise, not a price comparison. The lowest fee can produce a report that will not be accepted by a court, a tax authority, or a financial partner, even if the dollar value is correct. A few practical checks help narrow the list:

Confirm the license. Look up the appraiser in the state licensing database. The state database will show the license level, expiration date, and any disciplinary history. This is the most basic step and the easiest to skip.
Match the license to the assignment. A certified general is required for most commercial and income-producing work. A residential assignment can be handled by a licensed residential or certified residential appraiser, depending on the property.
Ask about experience with the property type. A rural appraisal, a high-rise condo appraisal, and a small multifamily appraisal are not interchangeable. Appraisers build expertise around specific property types and submarkets.
Ask for a sample report. A confident appraiser will share a redacted report from a similar assignment. Reviewing a sample helps you understand the depth of analysis and the format that will be delivered.
Discuss the report format up front. Different engagements call for different report types. A self-contained narrative report is more expensive than a form report, but a tax board or a court may require the narrative version.
Clarify the effective date and the intended use. The appraiser needs to know exactly which date the value should be as of, and how the report will be used, because both affect scope and fee.

The fee structure for direct hires is usually quoted as a flat fee per assignment, not an hourly rate. Fees vary widely by property type, complexity, and region. For a typical single-family home, fees can range from a few hundred dollars for a simple form appraisal to several thousand dollars for a complex or unique property. Commercial appraisals are commonly quoted as a base fee plus a per-unit or per-acre component. Avoid any appraiser who quotes a fee based on a percentage of the value, because that introduces a financial incentive that the professional standards are designed to prevent.

Appraisal standards and oversight

The professional standards that govern appraisal work in the United States are the Uniform Standards of Professional Appraisal Practice, commonly called USPAP. USPAP is developed by the Appraisal Standards Board of the Appraisal Foundation and is updated on a regular cycle. The standards cover everything from the definition of market value to the content of the report and the conduct expected of an appraiser in an assignment.

State appraiser regulatory agencies enforce USPAP through their licensing authority. They investigate complaints, conduct audits, and can suspend or revoke a license. Federal oversight of the state system is provided by the Appraisal Subcommittee under Title XI. This layered system is the reason an appraiser’s signed report carries weight in court, in tax appeals, and in the secondary mortgage market.

For a consumer, the practical takeaway is that an appraisal is not a casual estimate. It is a regulated professional service, and the regulatory framework is what gives the report its credibility.

How appraisals interact with other home decisions

Appraisal is one piece of a wider set of decisions that surround a property. Readers who are working through a transaction will often run into adjacent topics that interact with the appraisal:

Inspection and condition. A home inspection and an appraisal are different services. Inspections focus on the condition of systems and components, while appraisals focus on market value. The two reports can disagree about the importance of a particular defect, and they often do.
Comparable sales analysis. A real estate agent’s CMA is a sales tool, not a regulated appraisal. For any decision that requires a defensible value, an appraisal is the standard.
Remodeling decisions. Not every remodel returns its cost at resale. Appraisers can speak to the typical contribution of specific improvements in a given market, but they cannot guarantee a return on a particular project.
Refinance timing. A refinance appraisal is a snapshot in time. If the market moves after the appraisal, the value in the report is still the value the lender uses, which can affect the loan amount and the rate.

If you are also weighing contractor work as part of a sale or refinance, it is reasonable to ask a licensed appraiser whether the planned improvements are likely to be reflected in the value opinion, and to ask the contractor whether the work is likely to be considered a real property improvement for appraisal purposes.

Questions to ask your appraiser before the inspection

A short, focused conversation before the visit makes the assignment smoother. Useful questions include:

What is your license level, and is it current?
Have you appraised similar properties in this neighborhood recently?
What report format will I receive, and how long will it take?
Will you personally inspect the property, or will a trainee be on site?
What information should I have ready for you, such as a list of recent upgrades, the prior sale contract, or a floor plan?
How will the fee be billed, and what is included in the quoted fee?

Asking these questions up front reduces surprises during the assignment and sets a clear expectation for the deliverable.

What to do if you disagree with the value

Disagreement with an appraisal is more common than people expect, and there are constructive ways to handle it. The first step is to read the report carefully, including the comps, the adjustments, and the reconciliation. Errors in square footage, room count, or site size are common and can be documented with a quick check of public records.

If the comps are weak, gather additional sales that are more similar to the subject in location, size, and condition, and provide them in a clear, organized format. If condition was mischaracterized, document the upgrades with receipts, photos, and permits. The reconsideration request should be factual and focused, and it should be sent through the lender or the AMC rather than directly to the appraiser.

If the reconsideration does not change the value and the financial stakes justify the cost, a second appraisal from a different appraiser is sometimes an option, particularly for tax appeals, estate work, and litigation. For loan transactions, the lender has discretion on whether to accept a second appraisal, and the rules vary by loan type and investor.

Frequently asked questions

What is the difference between an appraiser and a home inspector?

A real estate appraiser forms a supported opinion of market value for lending, legal, or financial purposes and is licensed or certified by a state regulatory agency. A home inspector evaluates the physical condition of the property and reports on the state of systems and components. The two roles overlap in the sense that condition affects value, but they are separate services with different deliverables, different standards, and different regulatory frameworks.

How long does a typical residential appraisal take?

From order to delivery, a routine single-family appraisal usually takes between one and three weeks, depending on the market, the workload of the AMC, and the complexity of the property. The inspection itself is typically 30 to 60 minutes. Commercial appraisals take longer because of the additional analysis and report depth.

Can a buyer or seller choose the appraiser for a mortgage transaction?

In a typical mortgage transaction, the lender selects the appraiser through an appraisal management company. The borrower cannot choose the individual appraiser, but the borrower can refuse the appraisal, request reconsideration of value with additional comps, or in some cases ask for a second appraisal. The rules vary by loan type and by the policies of the investor that will purchase the loan on the secondary market.

How much does an appraisal cost?

Fees vary widely by region, property type, and complexity. A simple single-family form appraisal can run from a few hundred to roughly a thousand dollars in many markets. Larger or more complex properties, and most commercial work, cost more. The fee should be quoted in advance and should not be tied to the value of the property, because percentage-based fees undermine independence.

What is the Uniform Standards of Professional Appraisal Practice?

USPAP is the set of professional standards that govern appraisal practice in the United States. It is developed by the Appraisal Standards Board of the Appraisal Foundation and adopted by reference by state appraiser regulatory agencies. USPAP covers conduct, management of the assignment process, and the content and reporting of the appraisal.

How do I verify an appraiser’s license?

Every state maintains a public licensing database that shows the appraiser’s license level, expiration date, and disciplinary history. A quick search of the state database is the most reliable way to confirm that the person is in good standing and holds the right license level for the assignment. The licensing framework in California, for example, is administered by the California Bureau of Real Estate Appraisers.

Can an appraisal be reused for a different loan or transaction?

Generally no. An appraisal is tied to a specific client, a specific intended use, and a specific effective date. A refinance appraisal cannot usually be reused for a home equity line, and a purchase appraisal cannot usually be reused for a tax appeal. Reusing an appraisal in a way the appraiser did not consent to can create compliance problems for the lender and undermine the credibility of the report.

What happens if the appraisal comes in below the contract price?

The parties can renegotiate the price, change the loan structure, request a reconsideration of value with additional comps, ask the seller to contribute toward closing costs to cover the gap, or walk away, depending on the contract terms. In most contracts, the appraisal contingency is the formal mechanism that allows a buyer to exit without losing the earnest money when the appraisal is low.

Do appraisers consider the value of upgrades and renovations?

Yes, but the contribution of any specific upgrade to market value is based on market reaction, not on what the owner spent. Appraisers research what buyers in the market actually pay for finished basements, updated kitchens, new roofs, and similar items, and they adjust the comps accordingly. Documentation of the work, including permits, receipts, and before-and-after photos, helps the appraiser support the contribution.

Are online or desktop appraisals accurate enough to use for a major decision?

Desktop and appraisal waiver products exist for certain loan types, and they can be appropriate when the lender’s automated valuation model has high confidence in the value. For estate work, tax appeals, litigation, and complex properties, a desktop estimate is not a substitute for a full appraisal performed by a licensed professional who has inspected the property and supported the value with documented analysis.