You cannot smell it any more. Everybody who lives in a house stops smelling it within a week or two, which is why the first person through the door at a viewing knows something about your property that you no longer do. Smoke and pet odour cost more money at sale than almost any repair of equivalent cost, and most of what people try does not work.
This article covers why odour behaves the way it does, what actually removes it and what only masks it, the damage underneath that buyers price separately, and what to disclose.
We buy houses, so read the last section knowing that. We are not remediation contractors. Where a property has significant contamination, ask a specialist to assess it, and do not let the company that assesses be the company quoting for the work. Where an older house is involved, disturbing surfaces raises separate questions our article on asbestos and lead paint covers.
Why you cannot smell your own house
The effect is called olfactory adaptation and it is universal. Continuous exposure to a smell reduces your perception of it until it disappears entirely from your awareness. It is not that your house smells less than a visitor thinks. It is that you have stopped receiving the signal.
Ask somebody who has never been in the house, and ask them to be unkind.
A friend will say it is fine. Ask them instead to walk in and immediately say the first thing they notice, and tell them that a polite answer costs you money. That two minute exercise is the most useful thing in this article.
Failing that, leave the house closed for a day and walk in from outside on a cool morning, which is when it is strongest.
Where the smell actually lives
This is where money gets wasted, because people treat the air and the smell is not in the air.
- Soft materials. Carpet, and more importantly carpet underlay, which holds far more than the carpet does. Curtains, upholstery, mattresses
- The subfloor. With pet urine in particular, what soaked through matters more than what is on top. Replacing carpet over a contaminated subfloor produces a house that smells fine for three weeks
- Porous surfaces. Unsealed timber, plaster, and with smoke, everything. Tobacco residue films onto every surface in the house including the ceiling
- The HVAC system. Ducts, the coil, and the filter that has been recirculating it for years
- Behind and under. Skirting boards, the gaps at the edges of rooms, under appliances, inside cupboards
Smoke and pet odour behave differently. Smoke is a film on hard surfaces as much as it is in soft ones, which is why washing walls does more for smoke than it does for pets. Pet urine is a liquid that went downward, which is why flooring decisions matter more.
What works, in order
- Find and remove the source. Everything else is cosmetic until the contaminated material is out of the building. This usually means carpet and underlay, and sometimes a section of subfloor
- Clean hard surfaces properly. For smoke this is the big one: walls, ceilings, inside cupboards, light fittings, switch plates. It is unglamorous and it is where the result comes from
- Deal with the HVAC. New filter at minimum, and a proper duct assessment where the smell is general throughout the house rather than in one room. Our article on an HVAC system at the end of its life covers the wider question of what a buyer's inspector will say about it
- Seal what remains. A proper stain and odour blocking primer on contaminated surfaces before painting. Emulsion straight over nicotine does not hold and it is the single most common wasted weekend
- Ventilate over time. Days of airflow after the work, not an hour before a viewing
- Then replace flooring, last, once what is underneath is dealt with
What does not work
Air fresheners, plug-ins and scented candles. These add a smell rather than removing one, and buyers read them as concealment. A house that smells strongly of vanilla makes people look for what it is covering.
Baking bread and coffee. The old advice. Buyers now know the trick and it produces exactly the suspicion it is meant to avoid.
New carpet over an old problem. Expensive and temporary.
Painting without sealing. Covered above and worth repeating.
Ozone and fogging as a first step. These have their place in professional remediation after the source is removed. Used instead of removing the source they buy weeks, not a sale.
The damage underneath, which is priced separately
Odour is one problem. What caused it is frequently another, and a buyer's inspector reports on the second.
Pet damage: scratched doors and frames, chewed skirting, damaged flooring, and where urine reached the subfloor, staining and sometimes rot. Fencing and garden damage where a dog has worked a boundary line.
Smoke: yellowed ceilings and fittings, discoloured switch plates, film on windows, and in heavy cases residue in the ductwork.
Our article on what a home inspector checks covers how these appear in a report, and our article on what to do with an inspection report covers separating what to fix from what to price.
The fortnight before viewings
Assuming the real work is done, a few things genuinely help in the run-up, and they are different from the tricks in the section above because they remove rather than add.
Get soft furnishings out of the house. Not cleaned, out. Sofas, rugs, cushions and bedding hold odour and they are the things you can remove without a contractor. A sparser house also shows better, so this costs you nothing twice over.
Wash everything washable at the highest temperature the fabric allows, including curtains, and consider replacing shower curtains and bath mats outright because they are cheap.
Deal with the litter tray and the food bowls, and move them out of the house entirely on viewing days along with the animals themselves. A buyer who meets a dog remembers the dog rather than the kitchen, and a nervous animal in a house full of strangers is unfair to everybody.
Open the house properly beforehand. Cross ventilation for a few hours on the morning of a viewing, then close it so the house is at a comfortable temperature when people arrive. An obviously freezing house in February reads as a problem being aired.
Do not smoke in the house from the day you decide to sell. Obvious, and people carry on anyway and then wonder why the sealing did not hold.
One caution about photographs. A house that photographs beautifully and smells wrong produces viewings that end in the hallway, which wastes your time and puts days on market on the clock for nothing. Our article on days on market and a stale listing covers what that costs.
What to disclose, and what not to claim
Physical damage you know about belongs on the disclosure form, as our article on Oklahoma seller disclosure requirements covers.
The trap here is different from most. It is not usually failing to disclose. It is claiming the problem is gone when it is masked. Telling a buyer the house has been fully treated, when what happened was new carpet and three weeks of ventilation, is a statement they will test in July with the windows shut.
Describe what was actually done. Keep the invoices. A documented remediation is worth far more than an assurance, and it is the difference between a buyer accepting the history and a buyer discounting an unknown.
Where we come in
For most houses this is worth doing properly and selling normally. Removing contaminated flooring, cleaning and sealing hard surfaces and sorting the HVAC is real work but it is not renovation money, and a house that smells clean sells to ordinary buyers at an ordinary price. The gap between that and a discounted sale is almost always larger than the cost.
Where a cash sale genuinely fits: the contamination has reached the subfloor across the house, the smell sits alongside a longer list of condition problems, the property has been a rental and the damage is throughout, or you are not in a position to manage a fortnight of trades. Our page on selling a house that needs repairs sets out how the number is built and our repair cost estimator gives you a starting position.
The short version
- You cannot smell your own house. Ask somebody who has never been in it and tell them a polite answer costs you money
- The smell is not in the air. It is in soft materials, the subfloor, porous surfaces, the HVAC and the edges of rooms
- Smoke films onto hard surfaces; pet urine goes downward. They need different work
- Remove the source first. Everything else is cosmetic until the contaminated material is out
- Seal contaminated surfaces with a proper blocking primer before painting. Emulsion over nicotine does not hold
- Air fresheners and candles read as concealment and make buyers suspicious
- The damage underneath is priced separately from the odour
- Do not claim it is gone when it is masked. A buyer will test that in July with the windows shut
Frequently asked questions
Why can I not smell my own house?
Olfactory adaptation. Continuous exposure reduces your perception of a smell until it disappears from your awareness. It is not that the house smells less, it is that you have stopped receiving the signal.
How do I find out how bad it is?
Ask somebody who has never been in the house to walk in and say the first thing they notice, and tell them a polite answer costs you money. Or leave the house closed for a day and walk in from outside on a cool morning.
Where does the smell actually live?
Soft materials including carpet underlay, the subfloor where urine soaked through, porous surfaces, the HVAC system and ductwork, and the edges of rooms behind skirting and under appliances.
Is smoke different from pet odour?
Yes. Smoke films onto hard surfaces including ceilings, so washing and sealing does most of the work. Pet urine went downward, so flooring and subfloor decisions matter more.
Will new carpet fix it?
Not if the subfloor is contaminated. You get a house that smells fine for about three weeks, which is an expensive way to buy a short delay.
What is the correct order of work?
Remove the source, clean hard surfaces, deal with the HVAC, seal what remains with a blocking primer, ventilate over days, and replace flooring last.
Do air fresheners help?
They add a smell rather than removing one, and buyers read them as concealment. A house that smells strongly of vanilla makes people look for what it is covering.
What about baking bread before a viewing?
Buyers know the trick, and it produces exactly the suspicion it is meant to avoid.
Can I just paint over it?
Not with ordinary emulsion. Nicotine bleeds through, and painting without a proper stain and odour blocking primer is the most common wasted weekend in this whole subject.
Do ozone treatments work?
They have a place in professional remediation after the source is removed. Used instead of removing the source they buy weeks rather than a sale.
Should I replace the ductwork?
Start with an assessment and a new filter. A duct clean or further work is worth considering where the smell is general throughout the house rather than in one room.
How long should I ventilate?
Days of airflow after the work is done, rather than an hour before a viewing. The result comes from the work rather than the window.
What damage do buyers look for?
With pets, scratched doors and frames, chewed skirting, damaged flooring, subfloor staining and garden damage. With smoke, yellowed ceilings and fittings, discoloured switch plates and film on windows.
Is the damage priced separately from the smell?
Yes. Odour is one problem and what caused it is another, and a buyer's inspector reports on the second.
Do I have to disclose it?
Physical damage you know about belongs on the disclosure form. The odour itself is usually apparent, which is rather the point.
What is the real risk here?
Not failing to disclose. Claiming the problem is gone when it is only masked, which a buyer will test in July with the windows shut.
Should I keep the invoices?
Yes. A documented remediation is worth far more than an assurance, and it is the difference between a buyer accepting the history and discounting an unknown.
Is it worth doing before listing?
For most houses, yes. It is real work but it is not renovation money, and the gap between a clean-smelling sale and a discounted one is almost always larger than the cost.
What if the house was a rental?
Then the damage is frequently throughout rather than in one room, which changes the arithmetic. Get quotes before assuming either way.
Should I use a specialist?
Where contamination is significant, yes, and do not let the company that assesses it be the company quoting for the work.
Do you buy houses that smell?
Yes, including where contamination has reached the subfloor throughout. We take the work on.
When should I not sell to you?
When it is one or two rooms and the structure is sound. Do the work properly and sell to an ordinary buyer at an ordinary price.
We buy houses, so read the last section knowing that. We are not remediation contractors. Where a property has significant contamination, ask a specialist to assess it, and do not let the company that assesses be the company quoting for the work.