How to argue your home is in average, not good condition

Last updated 2026-07-11

What does 'condition' actually mean on a property tax assessment?

Condition is one of the core inputs an assessor feeds into a cost or sales-comparison model to reach your assessed value. It is not age. It is not square footage. Condition measures how well a home has been maintained and whether its components still perform at the level expected for a building of that type and age.

Most jurisdictions grade on a scale. The International Association of Assessing Officers (IAAO) describes a set of common grades running from Poor and Fair through Average, Good, Very Good, and Excellent, though the exact labels vary by state and county ^[1]. The step from 'Average' to 'Good' alone typically moves value by 5% to 15% in most cost-approach models, depending on how the assessor calibrated the scale locally.

Here's the problem. Assessors almost never walk through your house. They drive by, pull permit records, and apply a default grade. That default is almost always 'Good' or 'Average-Good.' A home with a 20-year-old HVAC system, original 1970s wiring, a kitchen untouched since the Reagan years, and a roof with five years of life left is not 'Good.' Calling it 'Good' overstates its value against comparable homes that really are.

You are not asking the assessor to admit your house is falling apart. You are asking them to apply the grade that matches observable, documentable reality.

How do assessors assign condition grades, and why do they default high?

The mass appraisal process is built for speed, and speed favors the default. A single assessor's office in a county like Cook County in Illinois values more than 1.8 million parcels ^[2]. LA County values roughly 2.5 million ^[3]. Field inspections are periodic at best, often once every four to eight years, and between visits the old grade just rolls forward.

The incentive structure doesn't help you. Assessed values feed tax revenue. An office that systematically grades homes low shrinks the tax base, which creates budget pressure. This isn't a conspiracy. It's how bureaucratic defaults work. The path of least resistance is to leave the prior grade alone.

Some states require an inspection before an assessor raises a grade but let them hold a grade steady with no inspection at all. Others allow desktop review that treats permit history as a proxy for condition. Pull a kitchen remodel permit and your grade may jump to 'Good' without anyone seeing the result. Pull no permits (because the work never happened) and you sit at whatever the default was.

The result is backwards. Homeowners who have done nothing get graded as if they've done everything.

Downgrading your condition grade is often the easiest argument to make in an appeal. It doesn't require finding comparable sales or attacking the assessor's math. It requires showing what your house actually looks like.

What is the difference between 'average' and 'good' condition in dollar terms?

The dollar gap between one grade and the next depends on the depreciation tables your jurisdiction uses. The IAAO's guidance on the cost approach shows condition adjustments appearing as percentage multipliers applied to the depreciated replacement cost of the structure ^[1].

In many county systems, the grade multipliers look roughly like this:

Condition Grade	Typical Multiplier Range	Effect on a $300,000 Structure Value
Excellent	1.15 to 1.25	+$45,000 to +$75,000
Good	1.05 to 1.15	+$15,000 to +$45,000
Average	0.95 to 1.05	Baseline or slight reduction
Fair	0.80 to 0.95	-$15,000 to -$60,000
Poor	0.60 to 0.80	-$60,000 to -$120,000

These multipliers are illustrative, drawn from IAAO cost-approach guidance rather than a single published table, because every jurisdiction calibrates its own ^[1]. Your county's actual numbers live in the assessor's manual, which is usually a public document you can download or request.

Run the math on your own place. If your assessed value is $400,000 and the assessor uses a 10% step between Good and Average, changing the grade cuts $40,000 off the assessed value. At a 1.2% effective tax rate, that's $480 a year, every year, until the next reassessment. Over five years, one appeal filing puts $2,400 back in your pocket.

What physical defects qualify a home as 'average' rather than 'good'?

You don't need a disaster. You need documented deferred maintenance and components that are aged or underperforming for a well-kept home of that vintage. The IAAO and most state manuals describe 'Good' condition as a home showing normal wear for its age with no deferred maintenance, while 'Average' covers homes with some deferred maintenance and adequate but not maximized function ^[1].

Here's what actually moves a hearing officer.

Roof age near or past useful life. The National Roofing Contractors Association puts the manufacturer-rated life of composition asphalt shingles at 20 to 30 years depending on grade ^[8]. A 22-year-old roof that hasn't been replaced is deferred maintenance. Get a roofer to note the age and remaining life in writing.

HVAC systems past median life expectancy. The U.S. Department of Energy puts average furnace life at 15 to 20 years, central air conditioners at 15 to 20 years, and heat pumps at 10 to 15 years ^[4]. A 19-year-old furnace is not a 'Good' condition feature. It's a liability.

Original kitchens and bathrooms more than 25 to 30 years old. Assessors know these drive value. If yours haven't been touched and the comps on the market have, that's a functional adequacy gap.

Aluminum wiring, knob-and-tube, or a 60-amp panel where 200-amp service is standard. Insurers flag these. So should you.

Foundation cracks, water intrusion, or settling that got patched but never fixed.

Single-pane windows throughout when the neighborhood standard is double-pane.

You don't need all of these. Two or three well-documented items, backed by photos and at least one contractor estimate, is enough to make 'Average' the honest grade.

How do you document condition defects for a tax appeal?

Documentation is everything. A verbal complaint at a hearing with no paper behind it goes nowhere. Here's the system that works.

Start with a room-by-room photo walk. Use your phone. Shoot every defect: peeling paint, stained ceilings, damaged flooring, aging appliances, the nameplate on the furnace (it shows the manufacture date), the electrical panel, the roof from the ground or a safe vantage point. Make sure your phone is embedding EXIF date data, or date-stamp each shot yourself.

Next, get at least one contractor's written assessment. Two is better. A roofer who writes 'roof is original from 1998, approximately 5 to 7 years of remaining life, replacement cost $18,000' is worth more than ten photos alone. Ask HVAC contractors, plumbers, or electricians for a written condition opinion, more than a bid. You want language like 'system is functioning but past the manufacturer's expected service life.'

Then pull your property record card. This is the document the assessor keeps for your parcel. It lists the grade they assigned and often the year of their last inspection. Grab it from the assessor's website or by calling the office. If their last inspection was seven years ago, that's relevant, and you'll say so.

Finally, write a one-page condition narrative. Keep it flat and factual: 'The subject property's HVAC system was installed in 2003 and has not been replaced. The roof is original from 1997. The kitchen and bathrooms have not been updated since original construction in 1981. Attached are photographs dated [date] and written assessments from [contractor names].' No drama. Just facts.

For a county like Gwinnett County or Cook County, an organized packet like this is what moves hearing officers. Disorganized complaints don't.

What is the difference between condition and depreciation, and does it matter for your appeal?

It matters a lot, and mixing them up will hurt you at a hearing.

Depreciation in the cost approach is the total loss in value from all causes: physical deterioration (the stuff wearing out), functional obsolescence (bad floor plans, outdated features), and external obsolescence (neighborhood factors). Condition is specifically about physical deterioration.

When you argue condition, you argue physical deterioration. You're saying the assessor underestimated how far the physical components of your house have worn down relative to what 'Good' implies.

Some homeowners also have a functional obsolescence argument running alongside it. A three-bedroom house with one bathroom, a layout with no master suite, or a basement that can't be legally finished may lose value beyond what condition alone captures. These are separate arguments. Make both if they apply, but label them separately in your presentation so the hearing officer doesn't blur them together.

Knowing which bucket each piece of evidence falls into makes you look prepared. Prepared appellants win more often. The IAAO's Standard on Mass Appraisal of Real Property flags accurate condition coding as one of the most common sources of assessment error ^[1].

How do you find the assessor's own condition grade for your home?

Your property record card (also called a field card, assessment card, or parcel data sheet depending on the state) is where to look. It exists for every parcel in the county and is a public record in all 50 states under state public records laws.

Most counties post it online. Go to the assessor's website, search your parcel by address or parcel ID, and look for a link labeled 'property details,' 'assessment record,' or 'building characteristics.' The condition grade usually shows up as a code: 'G' for Good, 'A' for Average, 'VG' for Very Good, and so on.

Not online? Call the assessor's office and ask for a copy of your property record card. They have to provide it. In most states it's free or costs a small copy fee.

Once you have it, check three things: the condition grade, the year of the last field inspection, and the building components listed (square footage, bedroom and bathroom count, garage). Confirm those components are right. Errors in the building record are a separate appeal argument, and they often sit right next to condition errors on the same card.

What evidence works best at a condition appeal hearing?

Hearing officers see a parade of frustrated homeowners who show up with grievances and no paper. What actually changes a grade is a clear, organized record that makes the officer's job easy, because they need to write a decision that cites something.

The most persuasive package has three layers.

Layer one is photographic evidence, organized by system (roof, HVAC, kitchen, bathrooms, foundation, windows). Label each photo with the system name and the date. Print them or drop them into a captioned PDF.

Layer two is third-party written opinions. Contractor letters, a home inspection report from purchase, or a fresh report from a licensed inspector you hire for this. A home inspection typically runs $300 to $600 ^[5]. That's worth it when it saves $400 to $800 a year in taxes.

Layer three is the assessor's own documentation turned against itself. If their record card says the last inspection was 2016 and it's now 2025, that nine-year gap is evidence the current grade isn't based on current conditions. If the card says 'Good' but no permits were ever pulled for a renovation, ask them what the 'Good' grade was based on.

At the hearing, stay calm and stick to facts. Try this: 'The assessor assigned a Good condition grade. Based on the age of the major systems documented here, an Average grade is more accurate under the definitions in your own assessment manual.' Then hand over the packet.

If you want a structured way to build that packet, the TaxFightBack appeal kit walks through the condition argument step by step and keeps 100% of any savings in your pocket.

Can comparable sales support a condition argument?

Yes, and this is often the strongest way to close the case.

If three homes on your block sold in the past 12 months at prices consistent with Average condition, and the assessor values your home as if it's Good, the sales data contradicts the grade. This bridges the condition argument into the sales-comparison approach, which usually lands harder than the cost-approach argument alone.

Here's how. Find two or three recent sales of homes close to yours in age, size, and neighborhood. Look at the condition those homes were in at sale. Listings on Zillow, Redfin, or the MLS often describe condition in plain language: 'original condition,' 'needs updating,' 'great bones but dated.' Print the listing.

If those homes sold at a price that implies Average condition, and your assessed value implies Good, the market backs a downward adjustment.

You can run it the other direction too. Find a genuinely Good-condition comp that sold for more than the assessor's value on your home, then show that your home, given its condition, should be worth less. Either path works.

For counties like Montgomery County or Santa Clara County, where assessed values run high, this combined condition-plus-sales argument moves hearings.

What are common mistakes people make in condition appeals?

The first mistake is arguing cosmetics. Faded paint, dated wallpaper, and tired carpet are not condition defects in the assessor's framework. They're normal wear and they don't move the grade. Stick to major systems and structural elements.

The second mistake is exaggerating. Call your house 'Poor' or 'dilapidated' when it's livable and functional, and the hearing officer discounts everything else you say. The argument is not that your house is bad. It's that it's honestly Average, not Good.

The third mistake is showing up with no comparable evidence. A condition argument standing alone is harder to win than one backed by sales data showing the market agrees with you.

The fourth mistake is missing the deadline. This is a hard stop. Most states give you 30 to 90 days from the mailing date of the assessment notice to file a formal appeal ^[6]. Miss that window and you wait until next year. Check your state's statute the day the notice lands.

The fifth mistake is not getting the assessor's condition definitions in writing before the hearing. Most counties publish an assessment manual that defines each grade. Get it. If the manual says 'Good means no deferred maintenance,' and you have deferred maintenance, you're quoting their own words back at them. That's a strong place to stand.

For large jurisdictions like LA County or Bexar County, the assessment manuals usually live on the assessor's website.

What happens after you make the condition argument and how do you know if it worked?

After you file and present, the timeline depends on your jurisdiction. Informal hearings with an assessor's representative often happen within 30 to 90 days of filing. Formal board hearings run longer, sometimes six to twelve months in backlogged counties.

The outcome lands one of three ways: the assessor agrees and changes the grade, the assessor disagrees and you escalate to the formal board of review or appeals board, or the assessor offers a partial adjustment. Partial adjustments are common. Keep a written record of what was offered and the basis for it.

If the grade change goes through, you'll get a corrected assessment notice with the new value. Check that the new value actually reflects the change. Do the arithmetic yourself. A 10% step between Good and Average means a $400,000 assessed value should fall to roughly $360,000. If the numbers don't line up, ask for the calculation in writing.

The change is usually prospective (it applies to the current or next tax year depending on when your jurisdiction's year runs) and typically carries forward until the assessor re-inspects and upgrades the grade. Some homeowners keep the corrected grade for several years, so the savings compound.

States like Illinois let you appeal every year during the appeal window ^[7]. If your condition doesn't improve and the grade creeps back up, appeal again.

Frequently asked questions

How much can a condition grade change lower my property taxes?

One grade step (Good to Average) typically cuts assessed value by 5% to 15% depending on the county's cost model. On a $350,000 assessment at a 1.2% effective tax rate, a 10% reduction saves about $420 a year. The exact figure depends on your jurisdiction's multiplier table, which usually sits in the assessor's public manual.

Can I request a condition re-inspection by the assessor before appealing?

Yes, and in some counties it's worth trying first. Call the assessor's office, explain that you believe the condition grade is wrong, and ask whether they can send an appraiser for a re-inspection. Some assessors update the grade administratively without a formal appeal. If they refuse or the result disappoints you, your formal appeal rights are still intact.

Does a recent home inspection report help in a condition appeal?

It's one of the strongest pieces of evidence you can submit. A licensed inspector's written report from the past 12 months documents specific deficiencies in objective language. It's third-party and licensed, so hearing officers give it weight. If you bought recently and had an inspection, pull that report. If not, hiring an inspector for $300 to $600 just for the appeal can pay for itself in the first tax year.

What if the assessor has never actually been inside my house?

Very common. Assessors in most jurisdictions rely on drive-by inspections or desktop review. If your property record card shows a last inspection more than three to five years ago, say so at your hearing. It means the current grade isn't based on current observation. Pair that with fresh photo documentation and contractor letters, and the burden shifts to the assessor to justify the grade.

Is the condition argument different from arguing that comps are overpriced?

Yes. A comps argument challenges the assessor's opinion of market value directly, using recent sales of similar homes. A condition argument says the assessor mischaracterized your home's physical state, which then inflated the value. You can run both at once, and the combination usually beats either alone. Lead with condition when the sales data in your area is thin.

Can I use Zillow's estimated value to support my condition argument?

The Zestimate is not reliable enough to present as standalone evidence. Zillow doesn't inspect homes, and its errors run wide, with a national median around 2.4% for on-market homes and much larger gaps for off-market ones according to Zillow's own accuracy data ^[9]. Use it as a rough sanity check only. Present actual closed sales with documented condition instead.

What if the assessor uses a 'market approach' instead of a cost approach?

Under a pure sales-comparison approach, condition shows up as an adjustment to comparable sales. The assessor should add value to comps in better condition than yours and subtract from comps in worse shape. Ask to see the condition adjustments applied to your comps. If those adjustments assume your home is Good and you can document Average, the same photos and contractor letters apply.

How do I find my county's definition of 'good' versus 'average' condition?

Search for your county or state assessor's 'assessment manual,' 'appraisal manual,' or 'property record card instructions.' Most are posted on the assessor's website as PDFs. If not, request them under your state's public records law. The definitions usually appear in the section on the cost approach or building valuation schedules. That language is what you'll quote at your hearing.

Do condition arguments work in all states?

Condition grading exists in the cost-approach models used across all 50 states, but its weight depends on whether your assessor leans on cost, sales comparison, or income approaches. States with older housing stock and heavy cost-approach use (the Midwest, Southeast, many rural areas) see condition arguments more often. In California, where Prop 13 caps reassessment, condition arguments mostly arise after a change of ownership or new construction.

Can deferred maintenance that I plan to fix still count against me today?

Yes, in your favor. Assessed value reflects conditions as of the assessment date, not future planned repairs. If the roof is 22 years old on January 1 (the typical assessment date in most states), that's the relevant fact. You can't be penalized for repairs you haven't made, and you shouldn't be graded as if you've already made them. Document current state, not planned state.

What if my home has good curb appeal but poor interior condition?

This is a classic drive-by problem. Assessors doing exterior-only reviews grade on what they can see from the street. Fresh paint and a tidy yard can hide an original 1980s kitchen, aging HVAC, and dated bathrooms. Interior photos become essential here. The condition grade is supposed to reflect the whole property, more than what shows from the curb.

Will arguing average condition hurt me if I sell the house later?

No. Tax assessment records and your MLS listing or disclosure documents are separate. Buyers look at actual condition, not the grade the county assigned. You're legally required to disclose known material defects under state disclosure laws regardless of your tax appeal. The appeal doesn't change your disclosure obligations one bit.

How long does a condition-based appeal take from filing to resolution?

Informal reviews usually resolve within 30 to 90 days. Formal hearings before a board of review can take three to twelve months in busy jurisdictions. Illinois, for example, runs boards in some counties on a rolling calendar for most of the year. File as early as you can after the appeal window opens to land an earlier hearing date.

Sources

1. International Association of Assessing Officers (IAAO), Standard on Mass Appraisal of Real Property: IAAO describes condition grades and their role in the cost approach, including that 'Good' condition means no deferred maintenance and that condition coding is a common source of assessment error.
2. Cook County Assessor's Office, About the Office: Cook County Assessor is responsible for valuing more than 1.8 million parcels in the county.
3. Los Angeles County Office of the Assessor, About Us: LA County Assessor values approximately 2.5 million real property parcels annually.
4. U.S. Department of Energy, Energy Saver: Heating and Cooling: Average furnace life is 15 to 20 years, central air conditioners 15 to 20 years, and heat pumps 10 to 15 years.
5. American Society of Home Inspectors (ASHI), Find an Inspector: Home inspections typically cost $300 to $600 depending on home size and region.
6. Lincoln Institute of Land Policy, Significant Features of the Property Tax: Most states allow 30 to 90 days from the mailing of an assessment notice to file a formal appeal.
7. Illinois Property Tax Appeal Board: Illinois allows property owners to appeal assessments annually during the appeal window, with the state board hearing cases on a rolling calendar.
8. National Roofing Contractors Association, Roofing Materials: Composition asphalt shingles have a manufacturer-rated useful life of 20 to 30 years depending on product grade.
9. Zillow Research, Zestimate Accuracy: Zillow reports its national median Zestimate error rate for on-market homes at approximately 2.4%, with significantly wider ranges for off-market properties.
10. IAAO, Standard on Ratio Studies: IAAO ratio studies are used to measure assessment uniformity and are the basis for determining whether assessments are systematically high or low across a jurisdiction.
11. U.S. Census Bureau, American Housing Survey: The American Housing Survey tracks housing conditions including roof age, plumbing deficiencies, heating system age, and kitchen adequacy across the national housing stock.