Asbestos and lead testing before a remodel: what happens and how long it takes

The short version: test first, then set the demolition date

Pre-renovation testing means an inspector walks the areas your project will disturb, takes small samples of each material that could contain asbestos, and tests the painted surfaces for lead. The asbestos samples go to a laboratory, and in my work results usually come back within 48 hours of testing. The visit takes as long as the number of rooms and materials requires, so with a little planning the whole process fits into the gap between signing with a contractor and the start of demolition.

The key is the order. Test, get the results, then let the contractor start. Once a popcorn ceiling has been scraped or a floor has been torn up, testing can only tell you what you have already spread through the house. Below I walk through which projects should trigger testing, what happens on the day, how long each step takes and what to do with the results.

Projects that should trigger a test

Anything that cuts, sands, scrapes, breaks or removes older building materials is a candidate. The EPA warns that renovation or repair work on painted surfaces in older buildings may create large amounts of lead dust, and that even small projects can pose risks. For asbestos, the EPA advises leaving undamaged material alone; a remodel is precisely when it stops being left alone.

• Removing or texturing over a popcorn or acoustic ceiling
• Pulling up old sheet vinyl, vinyl tile or the layers underneath it
• Replacing original windows, doors or trim
• Sanding or scraping paint for a repaint, inside or out
• Opening walls or ceilings for a kitchen or bath remodel
• Disturbing attic insulation, pipe insulation or older roofing
• Full or partial demolition of an older house or small commercial building

Is the building old enough to worry about?

For lead, the dividing line is 1978. The EPA notes that a home built before 1978 is more likely to have lead-based paint, because that is when the federal government banned its sale for homes. Paint layers last; a house that has been repainted many times can still have lead in the original coats underneath.

For asbestos, I use 1980 as a rough guide, but it is only a guide. I have found asbestos in popcorn ceilings in houses built as late as 1983. Many Dallas neighborhoods were built out in the decades when both materials were in common use, so if your house dates from before the early 1980s, or you do not know when it was built, testing the materials you plan to disturb is the safe default.

The EPA also makes a point that surprises people: you generally cannot tell whether a material contains asbestos by looking at it unless it is labeled. Two ceilings that look identical can test differently.

What happens on the day of testing

I start by going through the project with you, ideally with the contractor's scope or drawings in hand, so I know exactly which rooms, surfaces and materials will be disturbed. There is no value in sampling a ceiling that is staying, and real risk in missing the layer of old tile under the floor that is coming out.

Asbestos sampling is usually minimally invasive: a small piece of each distinct material, taken carefully and sealed for the lab. Lead testing focuses on the painted surfaces that will be cut, sanded or removed, such as windows, doors, trim and walls. If young children live in the house, I usually recommend going beyond the paint inspection to a risk assessment that also tests dust, soil and water, which I explain in my guide to lead paint in an older home with young children.

• Review of the project scope: which rooms, surfaces and materials will be disturbed
• Identification of each distinct suspect material, including hidden layers
• Small, careful samples of each material for laboratory analysis
• Lead testing of painted surfaces in the work area
• Notes and photographs tying each sample to its location
• A walk-through of what I saw before I leave

How long it takes, start to finish

For most residential projects, the timeline has four parts: booking the visit, the visit itself, the lab and the written report. The visit takes as long as the number of materials and rooms requires. Asbestos results usually come back within 48 hours of testing, and the written report follows once the lab results are in. When a contractor is already waiting, I offer emergency, weekend and holiday appointments, which may carry an additional fee.

That means the realistic gap is a few days, not weeks. The practical advice is to book the test as soon as you know the scope, not the week demolition is scheduled. If something comes back positive, you want time to adjust the plan without paying a crew to wait. The number of materials is also the main thing that drives the price, as I explain in my guide to what drives the cost of environmental testing.

If a sample comes back positive

A positive asbestos result does not automatically mean removal. Sometimes the best option is to change the plan and leave an intact material in place, or to cover it rather than disturb it. When it does have to come out, it should be handled by people trained and qualified to do so. The EPA recommends that the inspector not be connected with the firm that does the removal and says it is better to use two different firms, so the testing has no stake in the size of the job.

For lead, a positive result shapes how the work is done. Under the EPA's Renovation, Repair and Painting Rule, anyone paid to disturb painted surfaces in homes built before 1978 must be certified and use lead-safe work practices. The rule generally does not apply to homeowners working on their own home, but it does apply if you rent the home out, run a childcare business in it, or renovate homes to sell. Even where the rule does not apply, the dust is the same, so the same care makes sense.

A negative result is useful too. It gives your contractor documentation that the materials tested do not contain asbestos, and it lets the project go ahead without guessing.

Who should see the report

Your contractor needs it first, because it tells the crew which materials need special handling and which can be removed normally. Ask your contractor whether their permit or their own company policy calls for asbestos documentation before demolition. Keep a copy with your house records. If you sell the house later, a buyer's inspector or a future contractor will want to know what was tested and what was found.

If you are planning a larger project, testing belongs in the design phase, alongside the drawings and the budget. This guide on why kitchen remodels stall before demolition makes the broader case for settling those questions before the first wall comes down.

Rentals, flips and small commercial buildings

The stakes change when the property is not your own home. The EPA's renovation rule applies when the home is rented out, when it houses a childcare business, or when you buy, renovate and sell homes for profit, so a landlord or an investor cannot rely on the homeowner exception. Contractors working on those properties need to be certified, and knowing where the lead paint is before they start is what lets them plan the work properly.

Property investors are some of the people I work with most. For an older rental or a house bought to renovate, testing for asbestos and lead before closing, or at least before the renovation budget is set, turns an unknown into a line item. The same applies to small commercial buildings, where older ceilings, flooring and pipe insulation are common and a tenant build-out can disturb all three.

Mistakes that turn a remodel into a cleanup

The most common is testing after the work starts, usually because someone noticed the ceiling texture halfway through scraping it. By then the dust is in the air handler, the carpet and the next room. The second is sampling only the top layer. Older kitchens and bathrooms often have two or three generations of flooring stacked up, and the oldest layer is the one most likely to be a problem.

The third is assuming a recent remodel means the old materials are gone. A newer floor laid over original tile, or a new texture sprayed over an old ceiling, hides the material without removing it. The fourth is skipping lead testing because the paint looks fine. Intact paint is not the hazard until the sander arrives.

The fifth is letting the removal company do its own testing. Independent results keep the scope honest and give you a document you can show anyone.

Getting the test on your contractor's calendar

If you are buying an older house and already planning changes, it can make sense to test during the purchase rather than after; my guide to environmental testing before buying an older Dallas home covers that timing. If you already own the house, the best moment is as soon as the scope is settled.

I test homes and small commercial buildings across Dallas–Fort Worth, Northeast and East Texas and Louisiana. Send me the address, the year the building was put up if you know it, what the project will disturb and the target start date, and I will tell you what needs testing, what it costs and when results will be back.

Questions people ask me