How is lead paint handled in an older school or heritage building?

Lead was used in paint in Australia for most of the twentieth century. On a school or a public building constructed or painted before about 1970, it should be assumed present until a test says otherwise.

Intact and sealed under later coats it is largely inert. The risk appears when it is disturbed.

The risk is in the preparation

Dry sanding, scraping, burning, blasting and high pressure washing all convert a stable coating into airborne dust or fume.

Which makes the preparation method the hazardous activity, and it is why a repaint of an older building is scoped differently from one of a recent building. Children are the group most affected, which raises the consequence on a school or an early learning site considerably.

Deteriorating paint is the other source: flaking and chalking surfaces shed into soil and onto surfaces where it gets handled.

Where it is found

**Windows and doors,** which were almost always enamelled and which generate dust at every friction surface. The highest risk location in any older building.

**Skirtings, architraves and sills,** at child height.

**External walls and trim,** often with many layers.

**Metalwork,** including railings, gates and roof sheeting, where the primer carries it rather than the topcoat.

**Soil around the perimeter,** where decades of exterior flaking have accumulated, which matters on a landscaping or playground job as much as on a painting one.

How the work is controlled

**No dry sanding.** The single most important rule.

**Wet methods,** wet scraping and wet sanding, which keep the dust down and capture it.

**No heat guns or torches,** which produce fume.

**The area sealed,** with containment and ground sheeting that catches debris rather than letting it reach the soil.

**Air conditioning isolated,** because a running system distributes contaminated dust through the whole building, which is the mechanism described in [dust control near occupied spaces](/answers/dust-control-near-occupied-spaces).

**Filtered vacuums and a wet wipe down** at the end of each shift.

**Occupants excluded** from the work area and from any route the dust could have reached, for the duration and until the clean is verified.

**Waste disposed of** as the regulations require rather than in a general bin, which is part of [waste management and recycling on site](/answers/waste-management-and-recycling-on-site).

Encapsulation is usually the right answer

Removing lead paint is the most expensive and highest risk option.

So where the substrate is sound, the surface is prepared with wet methods to a stable condition and sealed under a coating designed to bond over it. The lead stays in place, bound under a new film, and no dust is generated getting there.

Where an element cannot be encapsulated, because it is a friction surface or because the coating has failed, replacing the component is frequently safer and less costly than stripping it. A window sash that binds and sheds dust every time it is opened is a replacement candidate rather than a repaint one.

Heritage buildings constrain the options

On a heritage listed building, elements cannot simply be replaced and the approach has to respect the fabric, which usually pushes the answer toward careful stabilisation and encapsulation rather than removal.

That is the same constraint described in [how are heritage school or institutional buildings refurbished while preserving fabric](/answers/how-are-heritage-school-or-institutional-buildings-refurbished-while-p) and in [bridge repair and heritage stone](/answers/bridge-repair-and-heritage-stone).

Where it changes a programme

The controls add time to the preparation, which is the largest part of any repaint on an older building.

Which is why the age of the building is established at tender and the method is priced accordingly, rather than discovered during the works and raised as a variation. The honest version of that pricing is part of [painting and refurbishment in occupied buildings](/answers/painting-and-refurbishment-in-occupied-buildings).

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