Cost per year, not cost per square foot. Running the numbers on four floors

Installed price is the number every quote leads with and the least useful one for a decision you will live with for two decades. The comparison that matters is total cost divided by years of service, and it reorders the options substantially.

The formula

Three inputs per option.

1. Total installed cost. Material, labor, subfloor prep, transitions, disposal. The full estimate, not the material line.
2. Realistic service life in your house. Not the marketing figure. Adjusted for traffic, pets, children and sunlight.
3. Maintenance and renewal costs across that life. Refinishing, recoating, professional cleaning, individual repairs.

Add the first and third, divide by the second. That is cost per year, and it is the figure to compare.

Where the service life numbers come from

Published lifespans assume conditions your house may not have. Adjust with the four factors that actually drive replacement.

• Traffic path. A hallway from the back door wears at a different rate from a guest bedroom. It is common to replace an entire floor because one path is worn.
• Pets. Claws scratch, and accidents damage what is beneath the surface as much as the surface itself. This single factor moves the ranking more than any other.
• Sunlight. Ultraviolet fades and, in some products, embrittles. A south-facing room ages a floor faster than the traffic in it does.
• Moisture. Kitchens, entries, laundry rooms and anything over a slab. Water is what ends most floors that did not wear out.

Then apply the honest test: what actually ends a floor's life in most houses is not that it wore through. It is that it looked tired, or a section was damaged and could not be matched.

The four options, on their own terms

Solid hardwood

Highest installed cost of the four in most markets. The longest potential life by a wide margin, because it can be sanded and refinished several times over its life.

The refinishing is the whole argument. Each cycle costs a fraction of replacement and resets the surface completely. A floor refinished two or three times across its life divides its original cost across a very long denominator.

Against it: sensitivity to moisture, not suitable over a slab without building a subfloor, and each refinish means vacating the space.

Engineered wood

Similar appearance, lower installed cost in most cases, and the critical variable is wear layer thickness. A thick sawn wear layer can take a full sanding, sometimes more than once. A thin veneer can be recoated but never sanded, which caps its life closer to a resilient floor's.

Two products sold side by side under the same description can differ by a factor of three on this single measurement, and that factor goes straight into the denominator.

Luxury vinyl plank

Low to moderate installed cost, minimal subfloor requirements, and genuinely durable against moisture. It cannot be refinished. When the wear layer goes, the floor is replaced.

Its cost per year is competitive in exactly the rooms that end other floors early: basements, entries, laundry rooms, and houses with several animals. In a formal living room with light traffic it is competing against products that will outlast it several times over.

Carpet

Lowest installed cost, shortest life, and the shortest by the largest margin in a busy household. Its replacement cycle is measured in single-digit years in a hallway and can be considerably longer in a bedroom.

Its real advantage is not in the arithmetic: it is quiet, warm and soft, which matters in bedrooms and on stairs. Its real disadvantage is that its life is ended by staining and matting rather than by wear, and neither is repairable in place.

The costs the formula misses

Three, and they belong in the decision even though they resist a number.

• Disruption. Replacing a floor means emptying the room. Refinishing means leaving the house. Each event has a cost in time and inconvenience, and a product replaced three times imposes it three times.
• Matchability. A damaged section of a discontinued product means replacing the whole area. Products that stay in production, and a spare box in the closet, are worth real money.
• Resale. Buyers respond to some surfaces more than others, and a floor in the wrong room type reads as a compromise regardless of its quality.

Running it for one room

1. Get complete installed quotes for each option in the actual room, including prep.
2. Write your own service life estimate for each, adjusted for traffic, pets, sun and moisture.
3. Add renewal costs across that life: refinishing cycles, professional cleaning, expected repairs.
4. Divide. Compare.
5. Then apply the tiebreakers the formula cannot hold: noise, comfort, matchability, and how long you plan to be there.

Run this way, the answer usually differs by room within the same house, which is the correct outcome and one that a single quote comparison never produces. The kitchen and the bedroom are answering different questions, and only the cost-per-year figure asks each of them properly.