What affects the cost of exterior house painting?

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Why prep is the biggest cost driver

Before any topcoat goes on, the surface has to be ready. Prep is not optional.

On exterior walls that face the weather every day, that work is almost always more involved than people expect. The standard sequence includes pressure-cleaning, sanding back peeling paint, filling cracks and gaps, treating mould at the source, and priming any bare or repaired areas. Every step takes time. On a wall that has been sun-baked or left alone for a decade, those steps can take longer than the painting itself.

This is why two quotes on similar-sized homes can look so different. A house repainted five years ago needs light prep. A weatherboard home with peeling paint, failed caulking, and a chalky north-facing wall needs a heavy prep pass first. The quote reflects that gap because the hours do.1DuluxView source

Older homes add one more step.

Homes built before 1970 may have lead paint on exterior surfaces. High-lead paints were common in Australia before the early 1970s. Any sanding or scraping of old exterior surfaces should be preceded by a check. A licensed painter or assessor can advise on what is safe to disturb. That check is an extra cost item that does not show up on a newer home's quote.2DCCEEWView source

Surface type: weatherboard, render, and brick

The material your walls are made of sets both the paint system and the labour.

Weatherboard (timber) is the most prep-heavy surface in Australian homes. Timber boards need sanding, primer on bare wood, and a full system: primer, undercoat, two topcoats. The more the boards have weathered (raised grain, checking, failed paint), the longer the prep takes.

Render is different. It is easier to sand, but cracks and hollow spots need to be cut back, repaired, and cured before painting. The full paint system still applies once the render is sound.

Brick is a one-way decision. Once brick is painted, reversing it is very hard. When homeowners do proceed, brick needs a sealer or masonry primer and a breathable coat. Prep shifts from sanding to cleaning and sealing.

Fences and decks are separate jobs. Outdoor timber fences may need an oil or stain rather than paint. Colorbond fencing needs a bonding primer. Neither is part of a house-exterior quote unless you specifically ask.

Being clear about which surfaces are in scope helps you compare quotes. Walls only is a different job from walls, fence, deck, and outbuildings.

Other things that push the price up or down

Beyond prep and surface type, three things move an exterior quote.

Coats and product quality. Two proper topcoats over a primed surface is the standard for an exterior job that holds. One thin pass costs less upfront but shortens the time until the next repaint, which raises the cost over time, and a premium exterior system will outlast a cheap one on a wall that faces north all day. The number of coats and the paint grade should both appear as line items in a detailed quote. Ask if they are not there.1DuluxView source

Access and height. A single-storey home is the baseline. A second storey, a steep gable, a tight side passage, or a job that needs scaffold all add to the price. A painter quoting a double-storey job is quoting a more complex setup than the same area on one level.

House size. Exterior painting is priced on square metres of wall, not floor area and not rooms. A compact single-storey and a large two-storey are different jobs on area alone. Doors, windows, and fascias are sometimes included in scope and sometimes separate. Asking upfront avoids surprises.

Is exterior painting more expensive than interior?

Generally yes.

Exterior painting has more variables. Surfaces face the weather every day, which means more prep and paint systems built for UV and rain. Access often needs ladders or scaffold. Interior painting, on a well-maintained wall, is typically less prep-heavy and needs no scaffold.

A heavy interior repaint with high ceilings, detailed trim, lots of patching, and a tight colour schedule can sometimes cost more per square metre than a simple exterior refresh on a well-maintained rendered wall. But the pattern only holds in general, and your specific job needs its own quotes. Compare them.

If you are planning both, most painters suggest doing the exterior first. Any repair work (fixing cracks, dealing with damp) should be done before the interior is touched.

For what interior painting costs, see [interior painting cost →].

For a breakdown by square metre, see [painting cost per square metre →].