When can a Tennessee property assessor reassess a property between scheduled reappraisal years if the owner remodeled, replaced a roof, or added an HVAC system?

Plain-English summary

Tennessee assessors reappraise property on a four-, five-, or six-year cycle depending on the county. Between those reappraisal years, the assessed value of real property generally stays the same. But if a property owner builds something new during the cycle, § 67-5-603(b)(1) lets the assessor add the value of that new improvement.

The opinion answers three related questions about how that mid-cycle correction works:

1. Can the assessor reappraise the entire property when an owner remodels, replaces a roof, or upgrades the HVAC? No. The mid-cycle reassessment is for the value of the new improvement only, not for redoing the whole property.
2. Is that constitutional under the Tennessee Constitution's equal-protection and uniform-taxation clauses? Yes, because § 67-5-1601(a)(3) requires the assessor to value the new improvement on the same basis as similar improvements were valued during the last revaluation year.
3. Does the cost of the work alone determine whether reassessment is required? No. What matters is the nature of the change. Repairs and replacements do not trigger reassessment. Genuine additions or expansions, like converting a carport to a garage, do.

What this means for you

If you own residential or commercial property and are planning work

The work most likely to not trigger reassessment: roof replacement, HVAC swap-out, like-for-like repairs. The work most likely to trigger reassessment: enclosing a porch into living space, converting a carport into a garage, adding a finished basement, building an in-law suite or accessory dwelling, expanding the footprint. The cost is not what matters. A $50,000 like-for-like roof and HVAC overhaul may not move your assessment, while a $20,000 carport-to-garage conversion may.

If you complete the work between January 1 and September 1 of any tax year, expect the assessor to issue a new or corrected assessment based on the value of the improvement at completion. Improvements completed after September 1 generally roll into the next year's assessment.

If you are a property tax assessor

This opinion is your guardrail and your toolkit. The guardrail: § 67-5-1601 does not let you reappraise the whole property mid-cycle. You can only value the new improvement. The toolkit: § 67-5-603(b)(1) requires you to issue a new or corrected assessment for the value of the improvement when it is completed and ready for use or occupancy between January 1 and September 1.

The constitutional protection is built in. Section 67-5-1601(a)(3) requires you to value new improvements on the same basis as similar improvements were valued during the last revaluation year. That keeps similarly situated taxpayers in your county on the same valuation methodology, satisfying Article II, Section 28's "equal and uniform" mandate.

When evaluating whether work counts as an "improvement," apply the Memphis Light definition from the Tennessee Court of Appeals: "A valuable addition made to property or an amelioration in its condition, amounting to more than mere repairs or replacement, costing labor or capital, and intended to enhance its value, beauty or utility or to adapt it for new or further purposes." Document what the work added, not just what it cost.

If you advise property owners on construction projects

Add a tax-impact note to your scope-of-work conversations. A client deciding between repairing a deck and adding a sunroom should know the sunroom is more likely to trigger a mid-cycle reassessment. The financial difference between the two options is not just the construction bill but the prospective increase in property tax over the next five-plus years.

If you are a real estate attorney handling a sale of recently improved property

Check whether a § 67-5-603(b) corrected assessment has been or could still be issued. Improvements completed in the months before closing can result in a corrected assessment that lands on the buyer. The buyer's tax allocation language should account for this risk.

Common questions

Q: Will replacing a 30-year-old roof trigger a new assessment?
A: Almost certainly no. A like-for-like roof replacement is "mere repairs or replacement" under the Memphis Light definition and does not enhance the property's value, beauty, utility, or adapt it for new uses.

Q: What about a major HVAC upgrade, say from window units to central air?
A: Closer call. A pure like-for-like HVAC replacement is not an improvement. But going from no central system to central air, especially if it requires structural changes (new ductwork, dropped ceilings), starts to look like an enhancement. The assessor will look at whether the change fundamentally adds capability rather than restoring it.

Q: Does an addition trigger reassessment of the whole house?
A: No. The assessor values only the addition itself. The pre-existing house keeps its prior-cycle assessment until the next county-wide reappraisal.

Q: What if the new improvement is finished after September 1?
A: Section 67-5-603(b)(1) covers improvements completed and ready for use or occupancy between January 1 and September 1 of any year. Improvements completed later in the year are typically picked up by the assessor's January 1 assessment for the following tax year.

Q: Why does cost not matter on its own?
A: Cost is a poor proxy for whether the change is an improvement. A high-end material replacement (premium roofing, designer HVAC) can be expensive and still be a replacement. A modest framing-and-siding addition can be cheap and still expand usable space. The tax question is about the nature of the change, not the bill from the contractor.

Q: Does this affect agricultural or greenbelt-classified property?
A: The opinion does not address greenbelt or agricultural classification specifically. Improvements to agricultural land (e.g., a new barn) follow the same § 67-5-603(b)(1) framework, but classification, exemptions, and use-value assessment introduce additional rules under Tenn. Code Ann. §§ 67-5-1001 et seq.

Q: Can I challenge a reassessment I think is wrong?
A: Yes. The standard administrative path is the local board of equalization, then the State Board of Equalization. If you think the assessor reappraised the whole property rather than just valuing the new improvement, this opinion gives you a direct argument that the action exceeded statutory authority.

Background and statutory framework

Tennessee's property tax system is built on two complementary timing rules. Real property is assessed annually as of January 1 (§ 67-5-504(a)), but reappraised only on a multi-year cycle (§ 67-5-1601(a)). Between reappraisal years, assessed values are designed to stay stable so that taxpayers can plan and budgets can stabilize.

Section 67-5-603(b)(1) is the standing exception for mid-cycle changes triggered by physical improvements to property. The legislature limited that exception in two ways. First, it applies only to genuine improvements (the Memphis Light "valuable addition" definition), not to repairs and replacements. Second, even when it applies, the new value must be set on the same basis as similar improvements during the last reappraisal year, so that two identical additions made in the same county get the same valuation methodology, regardless of which year they were built.

That second limit (the § 67-5-1601(a)(3) rule) is what eliminates the constitutional concern. The Tennessee Constitution's "equal and uniform" clause (Tenn. Const. art. II, § 28) requires the assessment-to-value ratio to be uniform within each property class. Mid-cycle improvement valuations satisfy that uniformity requirement when they are pegged to the methodology of the last revaluation year. The Tennessee Supreme Court has read the constitutional clauses to give the legislature broad discretion in defining classes and valuation methods (Sherwood Co. v. Clary).

The Memphis Light definition is the controlling working test for "improvement to real property" in this area, even though the property tax code does not codify that definition. Section 67-5-703(c)(3) provides a parallel definition specifically for the property-tax-relief-for-the-elderly context, but the broader "improvement" concept comes from common-law usage as adopted by the Court of Appeals.

Citations and references

Statutes:
- Tenn. Code Ann. § 67-5-603 (New improvements)
- Tenn. Code Ann. § 67-5-1601 (Reappraisal cycle and valuation rules)
- Tenn. Const. art. II, §§ 28, 29 (Equal and uniform taxation)

Cases:
- Sherwood Co. v. Clary, 734 S.W.2d 318 (Tenn. 1987), legislature's broad discretion over classification and valuation
- Memphis Light, Gas & Water Div. v. T.L. James & Co. Inc., No. 52, 1986 WL 11588 (Tenn. Ct. App. Oct. 17, 1986), definition of "improvement"

Prior AG opinions:
- Tenn. Att'y Gen. Op. 20-10 (May 20, 2020): assessed values generally remain unchanged between reappraisal years

Source

• Landing page: https://www.tn.gov/attorneygeneral/opinions.html
• Original PDF: https://www.tn.gov/content/dam/tn/attorneygeneral/documents/ops/2025/op25-007.pdf

Original opinion text

STATE OF TENNESSEE
OFFICE OF THE ATTORNEY GENERAL
March 4, 2025
Opinion No. 25-007
Reassessment of property between reappraisal years under Tenn. Code Ann. § 67-5-603(b)(1)
and § 67-5-1601(a)(3)

Question 1
Under Tenn. Code Ann. § 67-5-603(b)(1) or § 67-5-1601(a)(3), can a property assessor
conclude that the contributory value of miscellaneous construction, like remodeling, replacing a
roof, or upgrading an HVAC, to an existing structure requires a reappraisal of the property as a
whole between reappraisal years, and conduct a reassessment based on that conclusion?

Opinion 1
Tennessee Code Annotated § 67-5-1601 does not authorize reappraisals of property as a
whole outside the statutorily prescribed appraisal schedule. Under Tenn. Code Ann. § 67-5-
603(b)(1), however, if an improvement or new building is completed between January 1 and
September 1 of any tax year, the property assessor should make a new assessment or issue a
corrected assessment based on the value of the improvement at the time of its completion. In doing
so, the assessor should value the improvement as similar improvements were valued during the
last revaluation period for the assessor's county as required by Tenn. Code Ann. § 67-5-1601(a)(3).

Question 2
Does a reappraisal of an existing structure with miscellaneous construction completed
between reappraisal years, as described in Question 1, violate the Equal Protection Clause of
Article 11, Section 8, or the Equal and Uniform Clause of Article 2, Section 28, of the Tennessee
Constitution, or another provision of the Tennessee or United States Constitutions?

Opinion 2
No, the issuance of a new or corrected assessment under Tenn. Code Ann. § 67-5-603(b)(1)
does not violate equal protection or uniformity protections. The assessor is required by Tenn. Code
Ann. § 67-5-1601(a)(3) to value new improvements as similar improvements would have been
valued during the last revaluation year.

Question 3
In such a reappraisal, is there legal authority to support a property assessor's professional
opinion that the cost of modifying an existing improvement, standing alone, is insufficient to
determine a value change as required by Tenn. Code Ann. 67-5-603(b)(1)?

Opinion 3
Not all modifications will constitute improvements to real property requiring a value
change. What matters is the nature of the changes, not the cost. For example, mere repairs or
replacements to a structure generally will not constitute improvements triggering a new or
corrected assessment.

ANALYSIS

The Tennessee Constitution provides that "all property shall be taxed according to its value,
upon the principles established in regard to State taxation." Tenn. Const. art. II, § 29. It further
provides that "[t]he ratio of assessment to value of property in each class or subclass shall be equal
and uniform throughout the State, the value and definition of property in each class or subclass to
be ascertained in such manner as the Legislature shall direct." Tenn. Const. art. II, § 28. In
discussing these provisions, the Supreme Court explained that the legislature "was given very
broad discretion with respect to determining the value and definition of property in each of the
authorized classifications or subclassifications." Sherwood Co. v. Clary, 734 S.W.2d 318, 321
(Tenn. 1987).

The assessor of property for each county assesses all commercial, industrial, residential
property, and farm property in the county. See Tenn. Code Ann. §§ 67-5-801, et seq. (real
property); §§ 67-5-901, et seq. (tangible personal property); §§ 67-5-1001, et seq. (agricultural
property). By statute, all assessments of real property "shall be made annually and as of January
1 for the year to which the assessment applies." Tenn. Code Ann. § 67-5-504(a). While all real
property is assessed on an annual basis, the assessor is not required to revalue and reappraise real
property on an annual basis. Instead, the assessor conducts a reappraisal every four, five, or six
years, depending on the reappraisal schedule applicable to each county. Tenn. Code Ann. § 67-5-
1601(a). "Between reappraisal years, the assessed value of real property generally remains
unchanged." Tenn. Att'y Gen. Op. 20-10 (May 20, 2020).

As your request recognizes, there are exceptions to this general rule. Under Tenn. Code
Ann. § 67-5-603(b)(1), when an improvement or a new building is completed and ready for use or
occupancy between January 1 and September 1 of any year, "the assessor of property shall make
or correct the assessment of such property, on the basis of the value of the improvement at the time
of its completion, notwithstanding the status of the property as of the assessment date of January
1." This statutory language contemplates the valuation of the new improvement itself; it does not
authorize the revaluation or reappraisal of the property as a whole.

And the General Assembly eliminated any equal-protection and uniform-taxation concerns
by requiring that valuation of the improvement be based on valuation of similar improvements
during the last revaluation. Under Tenn. Code Ann. § 67-5-1601(a)(3), any new improvements
"shall be valued on the same basis as similar improvements were valued during the last revaluation
or otherwise as necessary to achieve equalization of such values." That language ensures that
similarly situated taxpayers in each county are taxed based on the same valuations and
methodology applicable during the last revaluation year. That is, the statutory valuation method
ensures that "[t]he ratio of assessment to value of property in each class or subclass" remains
"equal and uniform throughout the State." Tenn. Const. art. II, § 28.

Finally, as suggested by your third question, not all work done on real property will
constitute an improvement requiring the assessor to make a new assessment or correct an existing
one. The property-tax code does not specifically define the term "improvement to real property."
But see Tenn. Code Ann. § 67-5-703(c)(3) (defining improvement to a dwelling or lot, in the
context of tax relief for the elderly, as any change "that would properly warrant a change by the
assessor in the assessed value of the property for the year or portion of the year in which the
improvement is made"). In the absence of a specific definition, the courts have adopted the
following definition of improvement: "A valuable addition made to property (usually real estate)
or an amelioration in its condition, amounting to more than mere repairs or replacement, costing
labor or capital, and intended to enhance its value, beauty or utility or to adapt it for new or further
purposes." Memphis Light, Gas & Water Div. v T.L. James & Co. Inc., No. 52, 1986 WL 11588,
at *3 (Tenn. Ct. App. Oct. 17, 1986) (quoting Improvement, Black's Law Dictionary (5th ed.
1979)).

Cost alone, then, is not what determines whether the change to the property is a
reassessment-triggering improvement. Instead, the nature of the change is what matters. For
example, repairing a roof or replacing an HVAC system with an equivalent system, regardless of
cost, would likely constitute mere repairs or replacement and would not merit a new or corrected
assessment. Projects like converting a carport to a garage or building an in-law apartment, on the
other hand, would likely constitute improvements that should be assessed under Tenn. Code Ann.
§ 67-5-603(b)(1). And again, this is not because of the cost involved, but instead because these
projects result in new enclosed spaces with additional uses.

In sum, Tenn. Code Ann. § 67-5-603(b)(1) not only permits reassessments to account for
improvements to property; it requires it. To avoid equal-protection and uniform-taxation concerns,
however, those reassessments must be conducted in accordance with Tenn. Code Ann. § 67-5-
1601(a)(3) and must value new improvements as similar improvements would have been valued
during the last revaluation year. Finally, not all changes to real property will warrant reassessment.
Only those improvements that enhance the property's value, beauty or utility, or adapt it for new
purposes will suffice. Mere repairs, in turn, will not.

JONATHAN SKRMETTI
Attorney General and Reporter

J. MATTHEW RICE
Solicitor General

MARY ELLEN KNACK
Senior Assistant Attorney General

Requested by:
The Honorable Tim Rudd
State Representative
425 Rep. John Lewis Way N.
Suite 544 Cordell Hull Building
Nashville, Tennessee 37243