How to test for lead paint?

You have three routes: a certified lead inspector or risk assessor, a laboratory paint-chip analysis, or a consumer swab kit. The first two give results you can rely on and act on. Swab kits are a screening tool and are known to produce both false negatives and false positives.

Your three options, and what each is worth

A certified inspector or risk assessor is the definitive answer. They typically use an XRF analyser, which reads lead through the paint layers without damaging the surface, and they produce a written report. If you are buying, renting out, or planning work that will disturb a lot of paint, this is the option worth paying for.

Laboratory analysis of a paint chip is also reliable, and cheaper, but it tells you about the exact spot you sampled and nothing else. Lead is rarely uniform across a house — window sashes and door jambs are common hotspots because they were painted with harder, more durable, more lead-rich enamels.

Swab kits from a hardware shop change colour in the presence of lead. They are cheap and immediate, which is genuinely useful for a quick screen, but a negative result is not proof of absence and should not be the basis for skipping lead-safe work practices on a pre-1978 home.

Whichever route you take, remember the practical default: a home built before 1978 is presumed to potentially contain lead-based paint, and about 75% of pre-1978 US homes still do. If you are hiring someone for paid work that disturbs painted surfaces, the testing question and the certification question are separate — ask for both.

How we sourced this

This answer is composed from our knowledge base, which holds only what a regulator, a standards body or a manufacturer supports. The sources behind it are listed below with the date we accessed each one. If a claim on this page has no source under it, that is a bug — tell us and we will fix it.

Where a figure is product-specific — coverage, dry time, recoat time, temperature limits — we point you at the manufacturer's technical data sheet rather than printing a general number as though it were a specification. That distinction is the most common error in this trade, and it is the one that costs people a repaint.

Common mistakes

• Treating a negative swab result as proof of absence. Swab kits produce false negatives.
• Sampling one spot and concluding about the whole house. Window sashes and door jambs are common hotspots.
• Testing but not asking a paid contractor for their EPA firm certification — they are separate questions.
• Sanding to "see what is under there" before testing, which is the exact activity that creates the hazard.

Related questions

• When was lead paint banned?

Sources

Also asked as

• How to test for lead in paint?
• How to test lead paint?
• How to test paint for lead?

Last reviewed: 2026-08-17 · The PaintingMania editorial team · Lead paint & the RRP rule