What a Paint Test Actually Tells You About a Pre-1978 Pasadena House
September 1, 2026
Somebody rings us most weeks with a version of the same sentence. The house is old, they have heard about lead paint, and they want to know whether that means the repaint is going to cost double. The honest answer is that nobody can tell them over the phone, including us, and that the point of testing is precisely to stop guessing on a question that has a real answer.
Here is what testing does and does not tell you, and what changes on a job when the result comes back one way or the other.
Age Gives You Odds, Not Facts
Lead was permitted in residential paint in this country until 1978. That is the whole basis of the rule of thumb, and as rules of thumb go it is a decent one. Pasadena’s housing stock skews old. Bungalow Heaven alone is several hundred houses built mostly between the 1900s and the 1930s, and the same era of construction runs through Madison Heights, Garfield Heights, Normandie Heights and the older parts of Altadena. If your house has plaster over lath rather than drywall, single glazed double hung sash, and rafter tails poking out under a deep overhang, it was almost certainly painted at least once with a product that contained lead.
What the date does not tell you is where. And where is the entire question.
We have tested two houses on the same block, built in the same year by what looks like the same builder, and got completely different pictures. The first had been stripped and re-sided during a 1990s remodel, so the body of the house came back clean while the original sash in the back bedrooms came back positive on the first pull. The second had never been touched below the top two coats, and everything from the fascia down was positive. Same age, same street, entirely different jobs, entirely different quotes.
There is also the case nobody expects, which is a house from the mid 1970s that reads clean because the builder had already switched products before the deadline. Assuming based on the year would have cost that owner money for prep they did not need.
What We Test, and Why Not Everything
We test the surfaces the work will disturb. That is a shorter list than the whole house and it is deliberately so.
The window sash and the jambs they run in. The door edges and the stops behind them. Porch rails, balusters and treads. The fascia and the rafter tails, because that is where a scraper is going to spend real time. Whichever elevation is actually failing, since that is the one being taken back. If we are doing interior trim, the baseboards and the casings.
What we do not do is test forty spots for the sake of a thick report. If a wall is sound and we are washing it and coating over it without disturbing the film, its history does not change what happens on site. Testing it would produce a number that makes no difference to the method or the price, and charging for that is padding.
A Positive Result Is Not a Demolition Order
This is the part that most needs saying plainly, because the word lands harder than the situation warrants.
Lead sitting in a paint film that is intact, stuck down, and not being rubbed against is not doing anything to anyone. Paint on a wall is not the exposure route. Dust is. Chips are. A film becomes a genuine problem when someone attacks it with an orbital sander, torches it off with a heat gun, blasts flaking paint into the soil beneath a window with a pressure washer, or leaves a sash to grind itself to powder in its track every time a child opens it.
So the recommendation on most older houses is not removal. It is stabilization. Take the loose and failing material off in a way that controls the debris, feather the edges so the repair does not read through the finish, prime what came bare, and put a sound coating over the top. That approach makes less dust than stripping does, it costs less, and on a Craftsman with original redwood siding it also keeps a surface that has been doing its job for a hundred years.
Stripping to bare wood has its place. A door that has lost all definition under fifteen layers, a window that will never run again without it. Those are targeted decisions on individual components, made deliberately, with the containment to match. It is not a default setting for a whole house.
What Changes on Site
When a surface tests positive, the method changes and so does the calendar. In practical terms:
Scraping runs wet. The surface is misted as we work so the material comes away as chips and slurry rather than as a cloud. It is slower and messier and it is the single most effective thing on the list.
The ground gets sheeted well past the drip line, seams taped and edges weighted. On a day with Santa Ana conditions coming off the San Gabriels we stop, because wind will take sheeting and debris down the street faster than anyone can pick it up, and a containment that has blown away is worse than no containment because everybody assumed it was working.
Sanders, where sanding cannot be avoided, run with a sealed vacuum attachment. A great deal of it gets done by hand instead, because a machine on a piece of trim makes more airborne material than the time saving is worth.
Open flame is out entirely and so is any heat gun setting that takes the film to the temperature where it starts to give off fumes. Torching old paint is fast, it is common, and it is the one method we will not use on these houses at any price.
Clean-up happens at the end of every day, not the end of the job. Sheeting folded inward on itself, debris bagged, bags off the property that evening. Before we hand an area back, sills, porch decks and hard surfaces get a wet wipe down, because the entire purpose of everything above is that nothing is left behind for somebody to walk through.
All of that is real labor and it is why the quote for a positive house is higher than the quote for a clean one. It is also why we would rather test than assume in either direction. Charging every pre-1978 house for contained prep it may not need is not caution, it is a markup.
Where to Spend First If the Budget Is Tight
Most people do not have an open budget, and if the house needs more than the money covers, the friction surfaces are where it should go.
A double hung sash rubs its jamb every time it moves. On an original window carrying eight layers, that contact makes dust, and the dust lands on the sill and on the floor under it, which is exactly where small hands and pets end up. Door edges do the same against their stops. Covered porch treads do it underfoot. Those are the surfaces where a stable, intact film matters most, and they are also the fussiest ones to do properly.
Making a sash work again is slow work. The parting bead has to be free rather than painted solid. The meeting rails need to close. The glazing putty usually needs attention, and sometimes a pane needs re-bedding. Then it has to be primed and finished so that the two halves are not glued to each other by the first humid morning. It is the part of an old house repaint that gets quoted around and rushed most often, and it is the part that decides whether that room is still making dust next spring.
The elevations can wait a season. The sash usually should not.
The Other Half of the Job Is Just Painting
None of this replaces ordinary competence with a brush. Once the surface is stable you still have to pick the right primer for what you exposed, which is a bonding or alkyd primer on bare wood, a masonry primer on stucco, and a shellac based blocker on tannin bleed or a water stain. You still caulk every joint and butt end before the topcoat, because caulk is what keeps the next rain out from behind the finish. You still put on two coats over a color change, and you still work around the shade rather than painting into a hot west wall at four in the afternoon.
In Pasadena the south and west elevations take the whole UV load and fail years before the shaded sides do. That is the normal pattern and it is worth knowing before somebody tells you the whole house is due.
If your house predates 1978 and you are thinking about a repaint, start with a test rather than a color chart. Call (626) 566-4947 and we will come out, look at what the paint is doing, test what needs testing, and put the prep scope in writing before anybody talks you into a shade of green.