TL;DR
Proration reduces a carpet replacement charge to reflect the life the carpet had already used before it was damaged. The common arithmetic is replacement cost divided by expected life in years, multiplied by the years remaining. Whether proration applies where you live, and what expected life is assumed, is set by local rules and your lease -- this explains the concept and the documents that make it checkable.
What this article is
An explanation of a calculation that comes up constantly in deposit disputes involving carpet, plus what to ask for so you can verify it.
It is not legal advice. Whether proration is required, how it must be calculated, and what expected service life is assumed are governed by the rules where the property sits and by the lease. Some places address it explicitly and some do not. If money is at stake, check your lease and your local housing authority or a local attorney.
The concept in one sentence
Carpet wears out on a schedule, so a damaged carpet has not lost its full value -- it has lost the value of the years it still had left.
That is the whole idea. A carpet three years into a ten-year life still had seven years of use in it. A carpet nine years into that same life had one. Damaging the first is a much bigger loss than damaging the second, even if the damage is identical.
The arithmetic
The common approach works in three steps.
1. Establish the expected useful life of the carpet in years.
2. Subtract the carpet's current age to get the remaining years.
3. Multiply the replacement cost by the fraction of life remaining.
Written out: replacement cost divided by expected life, times years remaining.
A worked example. Suppose the expected life of the affected carpet is treated as ten years.
| Carpet age at move-out | Years remaining | Prorated share of replacement cost |
|---|---|---|
| 1 year | 9 | 90% |
| 3 years | 7 | 70% |
| 5 years | 5 | 50% |
| 7 years | 3 | 30% |
| 9 years | 1 | 10% |
| 10 years or more | 0 | 0% |
The last row is the one that matters most in practice. A carpet that has already reached the end of its expected life is generally treated as having no remaining value to lose, regardless of what happens to it. Whether that principle applies in your jurisdiction is a local question, but it is the standard version of the concept.
What is the expected useful life of rental carpet?
There is no single universal figure. Depending on the source and the grade of carpet, the assumed life in rental settings commonly falls somewhere in the five to ten year range, and higher-grade carpet in a low-traffic unit can exceed it. What number applies to a specific claim is generally set by local rules, a published schedule, or the lease.
What proration does not cover
Two things get confused with each other here.
Cleaning is not replacement. Proration applies to replacing a carpet, not to cleaning one. Cleaning is a service performed on an existing carpet, so there is no depreciation to apply. A cleaning charge stands or falls on whether it is a permitted deduction, not on the carpet's age.
Partial damage is not always whole-room replacement. If damage is confined to one room or one area, the relevant replacement cost is usually that area rather than the entire unit -- though carpet installed continuously across rooms and dye lot matching can complicate that. It is a fair question to ask.
What to ask for so the number is checkable
A prorated figure is only as good as its inputs. Three questions make it verifiable.
How old is the carpet, and what is the evidence? An installation invoice, a work order, or a dated inspection record. If the answer is a recollection, that is worth noting.
What expected life is being used, and where does it come from? A published local schedule, the lease, or a manufacturer rating.
What is the replacement cost, and is there a quote? An actual contractor estimate for the affected area, not a general figure.
If any of the three is missing, the calculation cannot be checked, and that is a reasonable thing to raise in writing. The broader process is in what a security deposit can cover.
Before proration matters, ask whether replacement is needed
The cheapest move in this entire conversation is often a test clean.
Clean a small section of the worst area properly -- pre-spray, dwell time, agitation, extraction, rinse -- and compare it to the surrounding carpet. If it comes back close, the problem was soil and cleaning is the answer, at a fraction of replacement cost.
If it stays dull and flattened, the fiber is abraded and cleaning will not change it. Bleach marks are a separate case entirely: those are dye loss rather than stains, so there is nothing to remove and cleaning is never the answer. Pet contamination that reached the pad also will not resolve with surface cleaning, because the source sits below where cleaning reaches. The decision framework is in when to replace versus clean carpet.
For landlords, the record is the whole game
If you may ever need to charge for carpet replacement, keep the installation invoice with the property file. Carpet age is the input that most often cannot be proven, and a claim that cannot show age is a claim that is hard to defend.
Also keep dated inspection photos between tenancies. Establishing the condition at the start of each tenancy is what separates one resident's damage from accumulated wear across several. The method works the same from either side and is in documenting carpet condition at move in.
FAQ
How is prorated carpet replacement calculated?
The common formula is replacement cost divided by the expected useful life in years, multiplied by the number of years remaining. A carpet with a ten-year assumed life that is damaged at year three leaves seven years remaining, so the prorated figure would be 70 percent of replacement cost under that approach.
How long is carpet expected to last in a rental?
Assumed useful life in rental settings commonly falls somewhere in the five to ten year range depending on grade and the source being used, and better carpet in a low-traffic unit can last longer. The figure that applies to a specific claim is generally set by local rules, a published schedule or the lease.
Can I be charged full price for replacing old carpet?
In places where proration applies, the charge is generally reduced to reflect remaining life rather than the full cost of new carpet. Whether that applies to your situation depends on local rules and your lease, so ask for the carpet's age and the calculation used, and check your local requirements.
Does proration apply to carpet cleaning charges?
No. Proration addresses the lost remaining value of an asset being replaced. Cleaning is a service performed on carpet that stays in place, so there is nothing to depreciate. A cleaning charge is evaluated on whether it is a permitted deduction under the lease and local rules.
What if the landlord cannot prove how old the carpet is?
That weakens a replacement claim, since age is an essential input to the calculation. It is reasonable to ask in writing for the installation invoice or work order. How that is resolved if documentation does not exist depends on the dispute process where the property is located.
Does normal wear reduce the prorated amount too?
Ordinary wear is generally not charged at all, so it does not enter the calculation as a deduction. It does affect the underlying reality: a carpet that has aged normally has less remaining life, and that reduced remaining life is exactly what proration is designed to capture.
Every situation is different, and this describes a common calculation rather than your rights. Before anyone assumes replacement, it is worth finding out whether the carpet cleans up. Get a quote and we will tell you honestly what it needs. Start at our carpet cleaning page, read how to extend carpet life, or head to get a quote.
