Pet Odor in the Floors of a House You Just Bought
Of everything a previous owner leaves behind, pet odor in the floor is the one that most often gets paid for twice. The pattern is always the same: the new owner rips out the old carpet, which smells, assumes that was the problem, lays something new and good, and then discovers on the first warm week that the smell came back through it.
This guide is about establishing how deep the problem goes before you spend anything on flooring, because that single piece of information determines everything else.
Part of our complete guide to odor removal and resale value, which covers every cause and what each one needs.
The short answer
Pet odor travels down. Carpet, then pad, then subfloor, then in long standing cases the joists and the gaps between boards. How deep it went decides the entire job, and you can establish that in an afternoon by lifting a corner. The expensive mistake is laying new flooring first, because a new floor over an untreated subfloor traps the odor briefly and then it works through, and now the treatment means taking the new floor up again.
- Depth decides cost, not the size of the room.
- Lift a corner before you buy any flooring. It is the cheapest information available.
- Hardwood is more forgiving than it looks; the gaps between boards are the problem, not the wood.
- Treat before you lay, always. Laying first is the costly order.
How deep did it go?
There are four levels and they cost very different amounts to resolve.
- Carpet only. Rare where an animal used a spot repeatedly, but common with a single recent accident. Cheapest outcome, the carpet goes and that is that.
- Carpet and pad. The usual case. Pad is porous and holds far more liquid than the carpet above it.
- Into the subfloor. Common where a pet returned to the same spot over months. Plywood and chipboard absorb readily and hold odor indefinitely.
- Into the joists and board gaps. Long standing cases in older houses, where liquid ran through the seams. This is the level where replacement sometimes becomes the honest answer.
Do this before you order flooring
An hour with a UV torch after dark and a lifted corner tells you whether you are buying flooring for a clean subfloor or a contaminated one. That decision is worth more than any product choice you will make afterwards.
You establish which one you have by lifting a corner of the carpet at a spot you have already identified, and looking at the pad and the boards underneath. Staining on the subfloor that follows the shape of the deposit above means it went through.
What each floor type means
The material you are dealing with changes the approach more than most people expect.
Carpet over plywood is the most common and the most treatable, because the pad comes out and the subfloor can usually be treated in place. Hardwood looks like the worst case and often is not: the wood itself is fairly resistant, and the odor is usually sitting in the gaps between boards and in whatever is underneath them, which can be reached. Concrete is porous and needs proper treatment rather than a surface clean, particularly in a basement or garage. Laminate and vinyl are the awkward ones, because liquid runs along the underside and spreads well beyond where it entered.
The order that saves money
The empty house you have right now is the cheapest moment this problem will ever have. Use it.
- Find every deposit. UV torch after dark, tape around each one, before anything is torn out.
- Remove carpet and pad. They are the cheapest thing to take out and almost always the largest reservoir.
- Establish the depth. Look at the exposed subfloor. Stain patterns tell you where liquid went through.
- Treat the subfloor at source. Enzymatic and oxidizing treatment applied directly to the material, plus sealing where the substrate cannot be fully cleaned.
- Then lay the new floor. On top of something clean and treated, which is the only version of this that does not come back.
Most homes are finished in 1 to 4 hours with green non toxic methods, safe around children and pets, never ozone and never a cover up.
Pet odor in the floors of a house you just bought? Get a free quote via our contact page before you lay new flooring. Source removal with green, non toxic methods, never ozone, most homes gone in 1 to 4 hours, fully insured and backed by a 100 percent guarantee.
Get My Free QuoteFrequently asked questions
I replaced the carpet and it still smells. Why?
Because the urine went past the carpet. The pad and the subfloor beneath it are still holding it, and the new carpet traps that for a short while before the odor works through. The subfloor needs treating, then the new flooring goes on top of it.
Can pet odor come out of hardwood floors?
Usually yes, and hardwood is more forgiving than it looks. The wood itself resists reasonably well and the odor tends to sit in the gaps between boards and in whatever is underneath, both of which can be treated. Long standing deposits that reached the joists are the harder case.
How do I know if it reached the subfloor?
Lift a corner of the carpet at a spot you have already marked. Staining on the subfloor following the shape of the deposit above means it went through. That single check is the most useful hour you can spend before ordering flooring.
Should I seal the subfloor instead of treating it?
Sealing has a place, but as the last step on material that has already been treated, not as a substitute. Sealing over live residue traps it temporarily and the odor finds its way out, usually through the seams and usually in warm weather.
Is it cheaper to just replace the subfloor?
Rarely, and it is a bigger job than people assume once you account for what sits on top of it. Treating in place resolves most cases. Replacement becomes the honest recommendation where liquid reached the joists over a long period, and a decent contractor will tell you which one you have before quoting.