How Much of a Building Can Cost Segregation Reclassify?

The typical range, and why it is a range

Cost segregation studies typically shift about 15 to 35% of building basis into the 5, 7, and 15-year classes, with the rest staying on the structural shell. That is a wide range on purpose. A building's actual construction, how much cabinetry, decorative lighting, and site paving it has versus how much is plain structural shell, drives the number, not a formula applied uniformly to every property. Separately, first-year deductions on commercial property typically run about 16 to 21% of building basis under current bonus rules, a related but distinct figure since it reflects what gets deducted in year one specifically, not the full share eventually reclassified.

5-Year7-Year15-Year27.5/39-Year Shell

1. 1Carpet and flooring
2. 2Cabinets and appliances
3. 3Curtains
4. 4Lamps and light fixtures

1. 1Bedroom furniture
2. 2Sofa and armchairs
3. 3Coffee table
4. 4Dining table and chairs

1. 1Driveway and walkway
2. 2Fencing
3. 3Landscaping
4. 4Deck

1. 1Roof
2. 2Exterior and load-bearing walls
3. 3Foundation
4. 4Central HVAC

5-Year: carpet and flooring, cabinets, appliances, light fixtures, curtains

7-Year: furniture

15-Year: driveway, fencing, landscaping, deck

27.5/39-Year Shell: roof, load-bearing walls, foundation, central HVAC

Where restaurants and hospitality land

In one benchmark run on a free-standing restaurant, first-year deductions totaled $599,678 against a $2,804,440 building basis, just over 21% of basis in year one alone. Restaurants carry a heavy kitchen equipment package, decorative interior finishes, and site work, all of which push them toward the high end of the reclass range described above.

Where simple shells land

A warehouse and office property in the same benchmark set still identified $330,674 in first-year deductions against a $1,911,675 basis, about 17%, without a kitchen or a heavy finish package behind it. A medical clinic benchmark came in close behind, $241,839 against $1,404,500 basis, about 17.2%. Even a plumbing- and steel-heavy building still finds real dollars; it simply lands lower in the range than a restaurant does. A mid-rise office benchmark landed at $479,220 against $2,971,345, about 16.1%, the low end of this particular sample set.

Four benchmark runs at a glance

Why this isn't a promise

These four rows are benchmark runs, not a menu. Every study is custom-priced and custom-modeled to the specific building; the actual reclass percentage on a given property depends on its own construction, and a fixed percentage applied blindly would be a guess, not an engineering result. A free Preliminary Benefit Estimate exists precisely so an owner sees a number modeled on their own building before committing to anything.

What drives the percentage up or down

• Interior finish level: heavier cabinetry, decorative lighting, and flooring push the reclassified share up.
• Kitchen and process equipment: restaurants and certain industrial uses carry equipment-serving electrical and plumbing that adds to the 5-year bucket.
• Site improvement scope: a large surface parking lot, extensive landscaping, or heavy site lighting adds to the 15-year bucket.
• Shell proportion: a tall, plain structural building with minimal interior build-out leaves more of the basis on the 39-year (or 27.5-year) schedule.

None of these factors work in isolation; an engineering-based study weighs the actual construction as a whole rather than scoring each factor separately.

The residential side of the range

The same range holds on the residential side, with its own texture. A delivered single-family rental study in Montgomery County, Pennsylvania, built 2013 and 4,946 square feet, identified $160,242 in accelerated basis against a $1,040,000 depreciable basis, 15.4% of basis, right at the low end of the typical range for a straightforward, well-built home with no unusual finish package. That property's first-year depreciation came to $174,905, 16.8% of basis, once 100% bonus was applied to the accelerated share along with the small first-year piece of the remaining shell depreciation.

What to do with this range

The honest use of a range like 15 to 35% is as a sanity check, not a quote. If a proposal promises a fixed percentage before an engineer has looked at a specific building's construction, that promise is not coming from the classification work; it is coming from a sales script. The number that matters is the one modeled against the actual property.

How this range compares across the benchmark set

Lay the four commercial benchmarks and the one residential benchmark side by side and a pattern emerges quickly: the properties with the most finish work and equipment, the restaurant and, in its own way, the medical clinic, sit above the properties with plainer construction, the warehouse and the mid-rise office shell. The residential example sits at the low end of the whole set, consistent with a straightforward single-family rental with no unusual build-out. These five are four benchmark runs and one delivered study, offered to illustrate the range described above, not as an average.

Why the range narrows once bonus depreciation applies

Because 100% bonus depreciation currently applies to the entire reclassified share of a qualifying property, the reclass percentage and the first-year deduction percentage tend to sit close together, though they are not defined the same way. See how bonus depreciation and cost segregation work together for the acquisition-date rule that determines which bonus rate applies to a specific property's reclassified share.

Sanity-checking a quote against the range: a real example

On a BiggerPockets thread, Megan Tyberg described buying a four-unit building in Columbus, Ohio for $350,000 and collecting two quotes for the same building that came in nearly double one another: one firm estimated a $75,000 to $95,000 reduction in taxable income, the other $40,000 to $60,000. She couldn't tell whether the gap was honesty or salesmanship.

A specialist replying in the thread ran the exact sanity check this range is built for. Back out roughly 20% for land and the building's depreciable basis lands near $280,000. A four-unit property carries kitchen, flooring, and fixture components multiplied across four separate units, which typically puts a fourplex's reclassified share at 28% to 38% of basis, toward the higher end of the range described above. That put the $75,000 to $95,000 quote inside the expected band and made the lower quote look conservative rather than more honest. He also flagged, unprompted, that neither quote appeared to include a partial asset disposition election for the roof she had just replaced, a second deduction the range check alone would not surface. (Paraphrased from a BiggerPockets forum post by Megan Tyberg.)

The takeaway for an owner comparing properties

An owner deciding between two potential purchases, one a plain shell and one with heavier finishes, can use this range as a rough planning input, understanding that the plainer building will likely reclassify less. That difference does not make the plainer building a worse investment; it simply means the timing benefit from a study will look different on paper, which is worth knowing before either purchase closes rather than after.

Frequently asked questions

Is 30% reclassified typical for cost segregation?

30% sits within the typical 15 to 35% range but toward the higher end. Where a specific building lands depends on its construction; a plain shell usually reclassifies less, a finish-heavy or hospitality property usually reclassifies more.

Why do restaurants reclassify more than warehouses?

Restaurants carry kitchen equipment, decorative finishes, and often heavier site work, all of which fall into the faster classes. A warehouse shell has comparatively little of that and more plain structural space that stays on the 39-year schedule.

Does an older building reclassify a smaller share?

Age itself is not the driver; construction is. What matters is how much of the building's actual cost is personal property and land improvements versus structural shell, which depends on the property type and build-out, not the calendar age of the building.

How is the reclass percentage determined for a specific building?

An engineering-based study reviews the actual construction, cost records where available, and classifies each component into its correct depreciation class. The resulting percentage is a byproduct of that classification, not a target set in advance of the review.

Do land improvements count toward the 15 to 35% range?

Yes. The 15-year land improvement class, paving, fencing, landscaping, and site utilities, is one of the three faster classes counted in that range, alongside 5-year and 7-year property found inside the building itself.

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