Builder assessed your new home too high: what to do

Last updated 2026-07-10

Why does a brand-new home so often get over-assessed?

Assessors take the path of least resistance. When a new home sells, they see a clean, arm's-length price and stamp it as the assessed value. Logical on the surface. The problem is what that price actually contains.

Builder contract prices are not pure market value. They include the builder's overhead and profit margin (typically 10-25% of the base price for production builders) ^[1], lot premiums for corner lots or cul-de-sacs, model-home upgrades you may or may not have chosen, financing incentives bundled into the price, and sometimes HOA initiation fees folded into the closing statement. None of that represents the market value of the real property.

Assessors are supposed to value the property, not the transaction. The International Association of Assessing Officers (IAAO) defines market value as the price a willing buyer and seller would agree on with neither under pressure and both fully informed ^[2]. A buyer who signs a builder contract before the home exists is not shopping finished, move-in-ready resale homes the way a normal market buyer does. That gap is the wedge your appeal rides on.

There's a second problem in new subdivisions. When the first homes in a development close, the assessor may apply the same price-per-square-foot to every lot before any resale comparables exist. If those early closings were on premium lots or carried builder incentives, every neighbor gets hit. This happens in fast-growing counties where construction outruns the assessor's ability to appraise homes one by one.

How do I know if my new construction assessment is actually too high?

Run a ratio check first. Most states assess at a fixed percentage of market value: 100% in California for new construction ^[3], 100% in Texas ^[4], other percentages elsewhere. Find your state's required ratio, then divide your assessed value by that ratio to see the market value the assessor is claiming.

Compare that implied value to what similar finished homes actually sold for. Not new builder contracts. Closed resales in your neighborhood over the past 6 to 12 months. If the assessor implies your home is worth $420,000 but three-bed, two-bath resales a mile away are closing at $360,000 to $380,000, you have a case with numbers behind it.

Check the land value separately. Many jurisdictions split the assessment into land and improvements. If the land is assessed at $150,000 but vacant lots nearby sold for $90,000, that alone supports a partial appeal.

Here's a quick self-check table:

Question	Where to find the answer
What is my assessed value?	Your assessment notice or county assessor website
What is my state's required assessment ratio?	State department of revenue or tax equalization board
What did similar resale homes sell for?	County recorder, Zillow sold data, Redfin
Did my contract include non-real-property charges?	Your HUD-1 or closing disclosure
What is the land assessed at separately?	Assessor's property record card

If the implied market value beats nearby resale comps by more than 5 to 10%, an appeal is almost certainly worth your time.

What is the appeal deadline for a new construction assessment, and how do I find mine?

This is where homeowners lose money without knowing it. Miss the deadline and you're locked in for the full year, sometimes longer in states with biennial reassessment cycles. Deadlines are not uniform across the country.

State	Typical appeal deadline	Where it starts
California	60 days from mailing of assessment notice (Prop 8 claim) [3]	Assessment notice date
Texas	May 15 or 30 days after notice, whichever is later [4]	Appraisal notice
Illinois (Cook County)	30 days after assessment publication [5]	Publication in local newspaper
Georgia	45 days from notice [6]	Assessment notice
New York (most counties)	Grievance Day, usually third Tuesday in May [7]	Fixed calendar date
Florida	25 days from mailing of TRIM notice [8]	TRIM notice (August)
New Jersey	April 1 (or April 1 of the following year for omitted assessments)	Fixed calendar date

For new construction, the notice may land mid-year or even after your first tax bill. Some states let you appeal an omitted assessment (where the assessor added your home to the rolls late) under a separate timeline. Call your assessor's office and ask exactly when the appeal window opens for newly constructed homes assessed mid-cycle.

If you're in Cook County, you can find assessment publication dates through the cook county tax assessor tax bill process. Texas homeowners in Bexar County should check bexar county tax assessor for local protest filing specifics. Georgia homeowners in Gwinnett County can find county-specific timelines at gwinnett county tax assessor.

What evidence actually wins a new construction appeal?

You need evidence in the assessor's language: comparable sales, property record errors, and a breakdown of what you actually paid for.

Comparable sales (comps). Your strongest tool. Pull 3 to 5 closed sales of finished resale homes (not new construction contracts) within your neighborhood or a tight radius, similar in square footage, age, and features, closed within the past 12 months. Your county recorder has these for free. So do Redfin and Zillow's sold-homes data. Organize them in a table: address, sale date, square footage, sale price, price per square foot. Then show that your assessed value implies a price per square foot above the comps.

Your closing disclosure. This document itemizes every dollar you paid at closing. Highlight anything that isn't real property: builder profit margin (sometimes a separate line), lot premiums, options and upgrades beyond standard finishes, HOA initiation fees, extended warranties, interest rate buydowns the builder funded. The assessor should strip these out before using the purchase price as market value evidence.

The property record card. Request it from the assessor's office. It lists square footage, bedroom and bath count, construction quality grade, and any features they credit you for. Errors are common on new homes because the assessor may have worked from plans instead of a finished inspection. If they show 2,400 square feet but you have 2,200, that alone can justify a reduction.

An independent appraisal. This runs $400 to $700 for a residential property ^[9] and carries real weight at a formal hearing. You don't always need one for informal review. But if you expect to face a board, a licensed appraiser's opinion of value is harder to wave off than your spreadsheet.

Skip one thing: builder brochures, listing sheets, or your own guess at what the home is worth. Boards want arm's-length transactional data, not marketing and not gut feelings.

How do I actually file the appeal, step by step?

The process varies by jurisdiction but follows the same shape. Here's the path:

Step 1: Get your assessment notice. It comes by mail. Keep the envelope, because the postmark can matter for deadline math. If your neighbors got one and you didn't, call the assessor's office right away.

Step 2: Request the property record card. Do this before you file. You need to know what the assessor thinks your home is before you argue against it. Most counties hand it over for free by phone, in person, or online.

Step 3: File the appeal form. Every jurisdiction has its own. California uses an Assessment Appeal Application (BOE-305-AH) ^[3]. Texas uses a protest notice filed with the county appraisal district ^[4]. Georgia requires a written appeal to the Board of Assessors ^[6]. The form is almost always on the county assessor's or board of equalization's website. File online when you can, since it creates a timestamp.

Step 4: Take the informal review first (if offered). Many jurisdictions offer an informal meeting with an assessor staff appraiser before the formal hearing. Do it. Bring your comps and your closing disclosure breakdown. A surprising number of cases settle here without ever reaching the board. Staff would rather fix an obvious error than defend it.

Step 5: Formal hearing. If informal review doesn't resolve it, you appear before the Board of Equalization (or Appraisal Review Board in Texas, or Assessment Appeals Board in California). Present your evidence in order: the value you claim is correct, the comps that support it, and any record card errors. Be brief and factual. Boards hear dozens of cases a day.

Step 6: Further appeal (if needed). If the board denies you and you still believe the value is wrong, most states let you escalate to a state tax court or circuit court. This step genuinely benefits from an attorney. Most valid new construction appeals settle long before it.

If you want a ready-made package of forms, instructions, and a comp analysis worksheet, the TaxFightBack appeal kit walks through this so you keep every dollar of savings yourself.

Can the builder's contract price legally be used as assessed value?

Yes, in most states the sale price is strong evidence of market value under the legal standard. But strong evidence is not conclusive evidence, and new construction sales have documented issues that courts and boards accept as rebuttal.

The IAAO itself acknowledges that new construction sales can differ from resale market value because of builder markups, contract incentives, and the fact that the buyer is often buying a product that doesn't yet exist at the contract date ^[2]. Texas law directs the appraisal district to consider the cost approach, the income approach, and the sales comparison approach and weight them appropriately ^[4]. If the assessor used only the builder's contract price without adjusting for non-realty items, that's a procedurally deficient appraisal.

Several state courts have ruled that builder contract prices must be adjusted before use as market value evidence. The Colorado Supreme Court held in Board of Assessment Appeals v. Colorado Arlberg Club (1981) that a sale price is not market value if it includes items that are not real property. That case arose in a different context, but the principle that appraisers must strip non-realty consideration out of a sale price is standard assessment law.

The practical point: you don't need to cite case law in your appeal. You just need to show the board, with numbers, that the contract price held non-real-property consideration and that resale comps support a lower value. The law is on your side when the facts are.

What if the assessor is using a cost approach instead of the sale price?

Some assessors, especially in areas without many comparable sales yet (a brand-new subdivision), use the cost approach. They estimate the land value, add the depreciated replacement cost of the structure, and land on an assessed value that way. This can produce a number higher than even the contract price.

To challenge a cost approach, attack each piece. First, is the land value right? Pull recent vacant lot sales in your area. Second, are the construction cost estimates accurate? The assessor usually pulls from a cost manual like Marshall & Swift or RS Means. If they assigned your home a quality class higher than what was actually built (common with new homes, because they haven't done a physical inspection), argue for a lower cost grade. Third, did they apply any depreciation? A brand-new home usually gets no depreciation credit, which is technically correct, but if functional issues exist (an odd floor plan, proximity to a highway, a small lot) you can argue for external or functional obsolescence.

The best counter to a cost approach overvaluation is still a stack of resale comps. If the cost approach spits out $450,000 but finished homes in your neighborhood sell for $380,000, the market has already told you the cost approach is wrong. Assessors are supposed to reconcile all three approaches, and boards generally respect market evidence over a cost estimate.

Does a homestead exemption help, and when should I apply for it?

Yes, and you should apply right after closing, separately from any appeal you file.

A homestead exemption cuts the taxable value of your primary residence by a fixed dollar amount or percentage. In Texas, the general homestead exemption removes $100,000 from the appraised value for school district taxes starting in 2023 ^[4]. In Georgia, the basic homestead exemption is $2,000 off the assessed value for state taxes, and many counties add their own on top ^[6]. Florida removes the first $25,000 of value from all taxes and an additional $25,000 from non-school taxes ^[8].

The exemption and the appeal are separate levers. The exemption cuts the base you're taxed on. The appeal cuts the assessed value itself. You want both. A lower assessed value multiplied against a lower taxable base after exemption gives you the smallest possible tax bill.

Exemption deadlines are strict and often earlier than appeal deadlines. In most states you apply by January 1 or April 1 of the tax year. Miss it by a day and you can lose the full exemption for the year. Check your county assessor's website the week you close.

California has a bonus. Proposition 13 caps the annual increase in assessed value at 2% per year after the initial purchase-year assessment ^[3]. So even if the first assessment is too high, lowering it at appeal locks in a lower base that compounds in your favor for years.

What if my property is in a large metro area with special assessment rules?

Assessment rules and appeal procedures differ a lot by county, and high-cost metros carry their own quirks.

Los Angeles County caps annual increases at 2% under Proposition 13, but the initial assessment for new construction is based on the completion date, not the sale date. The Assessor's Office issues a supplemental assessment that can arrive months after closing, and you can appeal it through the Assessment Appeals Board ^[11]. See our los angeles county property tax coverage for specifics, and our la county property tax article for commercial context.

In New York City, new residential construction falls into Class 1 (one-to-three family homes) or Class 2 (larger residential). Class 1 assessments are capped at 6% annual increase and 20% over five years, but the initial assessment can still be too high. The NYC Tax Commission handles appeals and the deadline is March 1 ^[7]. Our nyc property tax article covers the NYC-specific process.

Santa Clara County (Silicon Valley) also triggers a supplemental assessment on new construction, and values can be enormous. The County Assessor breaks the assessment into a completion-year stub period plus a full year forward ^[12]. Both periods can be appealed. See santa clara property tax for county-specific filing instructions.

In Montgomery County, Maryland, the assessment is based on 100% of market value and the State Department of Assessments and Taxation runs triennial reassessments, but new construction is assessed in the completion year. You have 45 days from the notice to appeal ^[10]. Our montgomery county property tax article covers the Maryland process.

How much can you realistically save by appealing a new construction assessment?

Nobody has clean aggregate data on new construction appeal outcomes specifically. The closest numbers come from general property tax appeal studies and county-level reporting.

The IAAO notes that properties with recent arm's-length sales tend to be assessed more accurately than others, which implies new homes (with a clear sale price on record) should come out fairly assessed ^[2]. In practice the opposite often happens, because of the non-realty items bundled into builder contracts.

County data from Illinois shows that roughly 60 to 70% of Cook County residential appeals produce some reduction, with median reductions in the range of 10 to 15% of assessed value ^[5]. Texas appraisal district data shows property owners who filed protests in 2022 got reductions on about 55% of residential protests, cutting a total of roughly $46 billion statewide in assessed value ^[4].

At the individual level, a 10% cut in assessed value on a $400,000 new home saves $1,200 to $2,000 a year depending on your local tax rate. Over five years that's $6,000 to $10,000. Real money for a family that just stretched to buy.

The cost of a DIY appeal is your time, the filing fee (usually $0 to $50 at the informal level), and possibly $400 to $700 for an independent appraisal if you go to a formal hearing ^[9]. Contingency firms typically charge 25 to 50% of the first year's savings. On a $1,500 reduction, that's $375 to $750 a DIY filer keeps.

What mistakes do homeowners make that sink their appeal?

Missing the deadline is the most common and the most painful. No board anywhere hears a late appeal on the merits. Put the deadline in your calendar the day the notice arrives.

Using active listings instead of closed sales as comps is a close second. An active listing is an asking price, nothing more. Boards want to see what buyers actually paid. Closed sales only.

Arguing about the tax rate instead of the assessed value. The appeal is about value, not about whether your bill feels high. The board can't lower your tax rate. It can only lower the assessed value. Frame everything around value.

Showing up with no documentation. "I think it's too high" is not evidence. Bring printed comp sheets, a copy of your closing disclosure with non-realty items highlighted, and your property record card with any errors circled.

Appealing based on what you paid rather than what similar resale homes sell for. If you paid $440,000 and comparable resales sit at $400,000, an assessment at $440,000 may be technically defensible. Your argument has to root in what the resale market says, not your personal contract.

Taking the first informal offer too fast. If a staffer offers a $5,000 reduction but your comps support $30,000, you can politely decline and go to the formal hearing. You forfeit nothing by saying no to an informal settlement that doesn't match the evidence.

Should I hire a property tax consultant or do this myself?

For a new construction residential appeal, DIY is realistic if you'll spend 4 to 8 hours gathering comps, reading your closing disclosure, and prepping a short presentation. The process is not legally complex at the informal and first-level hearing stages.

Contingency consultants earn their fee when the assessed value is very high (over $1 million), when your time is genuinely worth more than the fee would cost, or when you've already lost at the informal level and need to go to tax court. At that point, professional help pays off.

For most homeowners with a new home in the $250,000 to $700,000 range, the savings from winning even a partial appeal beat what a contingency firm would take. The TaxFightBack appeal kit gives you the forms, a comp analysis template, and a hearing checklist so you walk in prepared without handing over a third of what you win.

One honest caveat. Some counties settle quickly at the informal level and treat homeowners well. Others have boards that almost never grant reductions without a licensed appraiser's report. Ask neighbors or a local real estate agent about the track record in your county before deciding how much to invest in prep.

Frequently asked questions

Can I appeal my new home's assessment if I just closed last month?

Yes, and start now. The window often opens the moment the assessment notice is mailed, and it can be as short as 25 to 30 days in states like Florida and Illinois. Request your property record card right away, pull resale comps, and find your county's appeal form online. Filing on time matters more than a perfect submission, since most jurisdictions let you add evidence later.

Does the builder's sale price have to be the assessed value?

No. The sale price is evidence of market value, not automatically the assessed value. Assessors must value the real property, and builder contracts routinely include non-real-property charges like profit margins, lot premiums, options packages, and HOA fees. You can argue, with resale comps, that the true market value of the real property is lower than the contract price. Many boards accept this.

What is a supplemental assessment and do I have a right to appeal it?

A supplemental assessment is an extra assessment issued mid-year when a property changes ownership or new construction is completed. California, for example, issues them to capture the value increase when a home sells. You generally have the same right to appeal a supplemental assessment as a regular one, but the notice and deadline may be separate from your annual notice. Read every piece of mail from the assessor carefully.

How do I find comparable sales for a brand-new subdivision with no resale history?

Look past your immediate subdivision. Search resale homes within a 1 to 3 mile radius with similar square footage, age, and features that sold in the past 12 months. County recorder databases, Redfin, and Zillow's sold-homes filter are free. If your subdivision is so new that no nearby resales exist, that itself is evidence the assessor's value is speculative, and you can argue the cost approach should reflect actual construction costs, not inflated market assumptions.

Will appealing my assessment cause the assessor to raise it higher?

In most states, no. Most statutes bar the assessor from raising your value above the original assessment solely because you appealed. A handful of states technically allow an upward revision if the evidence supports it, but that's rare, and boards almost never raise values on homeowners who show up in good faith with comps. Check your state's statute, but don't let this fear stop you from filing.

Can I appeal the land value separately from the building value?

Yes, in most jurisdictions that split assessments into land and improvements. If vacant lot sales in your area support a lower land value, that's a valid standalone argument. Request the assessor's land valuation method and compare it to recent lot sales from the county recorder. A land value reduction carries over every year until the next reassessment, so it compounds well.

What if my builder included upgrades and options in the contract price?

This is one of the strongest arguments for a new construction appeal. Upgrades like premium countertops, custom flooring, and appliance packages inflate the contract price but may not fully translate to market value, because resale buyers negotiate on condition, not a menu of options. Bring your contract addendum showing which upgrades were included and their cost, and compare that to the standard finishes in your comp sales.

Is there a fee to file a property tax appeal on a new home?

Filing fees at the informal and first-level board hearing are typically $0 to $50 for residential properties. Some counties charge nothing. If you escalate to state tax court or circuit court, fees rise and you may need an attorney. For the large majority of new construction appeals, which resolve at the informal or board level, the cost to file is negligible.

How long does the appeal process take for a new home?

Informal reviews can wrap in 2 to 8 weeks. Formal board hearings usually take 3 to 9 months depending on the county's backlog. Cook County often runs backlogs of 6 to 12 months. Texas Appraisal Review Board hearings are usually scheduled within 2 to 4 months of filing. If the board reduces your value, any overpaid taxes for the current year are refunded or credited against your next bill.

Can I appeal a new construction assessment if I received a tax bill but no formal assessment notice?

Yes. Some counties send a tax bill without a separate assessment notice, or the notice gets missed. You can still appeal, though the deadline may have started ticking from the tax bill date or from when the assessment was published. Contact your assessor immediately, explain the situation, and ask if a late-filing exception applies. Some states have provisions for omitted assessment appeals that extend the window.

Does a homestead exemption reduce my assessed value or just my taxable value?

A homestead exemption reduces your taxable value, not your assessed value. The assessed value is the base number the assessor assigns. The homestead exemption is subtracted from that to get the taxable value the tax rate applies to. An appeal reduces the assessed value itself, which is why you want both: a successful appeal gives you a lower starting number, and the exemption cuts it further.

What if the assessor used plans rather than a finished inspection to assess my home?

Common, and it often produces errors. Request your property record card and compare it against your closing documents for square footage, bedroom and bathroom count, garage size, and quality grade. If the assessor recorded a larger home or a higher construction quality than was actually built, you have a straightforward factual correction, which can often be resolved at the informal level without any formal hearing.

Is the appeal result permanent, or can the assessor reassess higher next year?

The reduction applies for the current assessment year. In most states, the assessor can reassess at the next scheduled cycle, which may be annual, biennial, or triennial. But the lower value you establish at appeal sets a more defensible baseline. In California, Proposition 13 limits annual increases to 2% from whatever value is established, so a successful appeal has lasting value.

Sources

1. National Association of Home Builders, Builder Profit Margins Report: Production builder overhead and profit margins typically range from 10-25% of base home price
2. International Association of Assessing Officers (IAAO), Standard on Mass Appraisal of Real Property: IAAO defines market value as the price a willing, informed buyer and seller would agree on with neither under compulsion; new construction sales may differ from resale market value due to builder markups and contract incentives
3. California State Board of Equalization, Assessment Appeals and Proposition 13: California assesses new construction at 100% of market value; Proposition 13 caps annual assessed value increases at 2%; the Prop 8 appeal deadline is 60 days from the assessment notice; appeals use form BOE-305-AH
4. Texas Comptroller of Public Accounts, Property Tax Exemptions and Protests: Texas assesses at 100% of market value; the homestead exemption removes $100,000 from appraised value for school district taxes (effective 2023); the protest deadline is May 15 or 30 days after notice, whichever is later; statewide protests in 2022 resulted in roughly $46 billion in assessed value reductions
5. Cook County Assessor's Office, Appeal Statistics and Process: Roughly 60-70% of Cook County residential appeals result in some reduction, with typical backlogs of 6-12 months for formal hearings
6. Georgia Department of Revenue, Property Tax Exemptions and Appeals: Georgia's appeal deadline is 45 days from assessment notice; the basic homestead exemption is $2,000 off assessed value for state taxes
7. New York State Department of Taxation and Finance, Property Tax Appeal Procedures: In most New York counties, Grievance Day falls on the third Tuesday in May; the NYC Tax Commission appeal deadline is March 1
8. Florida Department of Revenue, Property Tax Oversight - Homestead Exemption and TRIM Notices: Florida's TRIM notice appeal deadline is 25 days from mailing; the homestead exemption removes the first $25,000 of value from all taxes and an additional $25,000 from non-school taxes
9. Appraisal Institute, Residential Appraisal Fee Survey: Residential appraisal fees typically range from $400 to $700 for a single-family home
10. Maryland State Department of Assessments and Taxation, Real Property Assessment Appeal: Maryland assesses at 100% of market value; new construction is assessed in the completion year; the appeal deadline is 45 days from notice
11. Los Angeles County Assessor, Supplemental Assessments: LA County issues supplemental assessments for new construction triggered by completion date; both the supplemental and annual assessments can be appealed through the Assessment Appeals Board
12. Santa Clara County Assessor, New Construction and Supplemental Assessments: Santa Clara County breaks new construction assessment into a completion-year stub period and a full forward year, both of which are separately appealable