What are the signs your house exterior needs repainting?

Run your hand across a sunny wall. If it comes away with a fine, powdery residue in the colour of the paint, that is chalking. It happens when UV and weather break down the resin that holds the pigment in the paint film. A little light chalking on an older house is normal. Heavy chalking means the paint is well into the second half of its life.

Chalking matters for two reasons. The wall has less protection than it used to, and new paint will not stick well to a chalky surface. A good exterior job washes and prepares the surface first, and the painter may use a primer or sealer suited to the surface. Check the product data sheet for what it recommends over chalky paint.

You will often see chalking first on north and west facing walls, which take the most sun, and it can leave streaks down the wall or on the paving under it after rain.

Yes, it is one of the clearest signs. Flaking and peeling paint means the bond between the paint and the surface has failed. Bubbling and blistering often points to moisture or heat trapped under the film. Once the paint lifts, water gets to the timber, render or fibre cement below and the damage speeds up.

Look closely around the places water sits or splashes. That includes the bottom of weatherboards, window sills, fascia boards, eaves, door frames and the base of walls near garden beds. If you can slide a fingernail under the edge of the paint and lift it, the paint is failing.

Painting over flaking paint without scraping and sanding it back will not solve the problem, because new paint just sticks to old paint that is coming off. Good preparation is a big part of the job, and it is where a good painter earns their fee.

Hairline cracks in render and along joins are common as a house moves with the seasons, and Melbourne's reactive clay soils in the west move more than most. Small cracks can be filled and repainted. Wider cracks, or cracks that keep returning, may point to movement or moisture that needs a builder or a specialist to look at before painting.

Bare timber is an urgent sign. Once the paint is gone, timber soaks up water, greys, splits and can start to rot. If you see bare patches on eaves, fascias, sills or the bottom of weatherboards, do not wait for the next season.

Also check the gaps. Caulking and sealant around window frames, door frames, trims and joints dry out and pull away over time. A gap wide enough to fit a coin is an open invitation for water. Sealing gaps is a small job that protects everything behind it, and it should be done before new paint goes on.

Fading on its own is mostly cosmetic, but it is also a warning. Paint fades when UV attacks the pigments and the resin, and a badly faded wall has often lost some of its protective film too. Compare the colour on a sheltered wall or under the eaves with the same wall in full sun. A big difference tells you how much the sun has taken.

Mould and algae are common on shaded, damp walls, especially on the south side of homes and under eaves or behind trees. Dark spots, green film or black speckling that keeps coming back after cleaning suggests the surface stays damp for long periods. A wash with a product made for mould on painted surfaces, followed by a rinse, is the usual approach. Follow the label and wear protective gear.

If mould returns quickly, look for the cause. Blocked gutters, leaking downpipes, poor drainage, garden beds against the wall and lack of sun or airflow are all common. Repainting over active mould without treating it and fixing the source is a short term fix.

Melbourne is hard on paint in a few different ways. Summer UV breaks down the paint film and fades colour. Hot days followed by cool changes make timber and render expand and contract, which stresses the paint. Winter brings damp, cold, and long periods when walls stay wet. Strong winds push rain sideways into joints and carry grit that scours the surface.

Homes in Point Cook, Altona and Werribee South also face salt. Salt-laden air settles on walls, gutters and metal fittings and can speed up wear and staining, especially on the sides facing the bay. Rinsing the walls down with fresh water occasionally helps remove salt, and coastal homes are often worth inspecting a little more often than those further inland.

Dark colours take more heat and tend to age faster in full sun. Lighter colours usually fade less visibly. Product choice matters too, and painters can talk you through exterior grade products suited to the exposure. Check the manufacturer's data sheet for the conditions a product is designed for.

There is no single answer. Exterior paint life depends on the product, the quality of preparation, the surface, the direction the wall faces and how exposed the house is. As a rough guide, many homes need a fresh look every several years, and some walls need attention sooner than others.

Do a simple check once a year, ideally after summer. Walk around the house in daylight and look at each wall. Touch the surface, check the eaves and sills, and look at joints and caulking. Take photos so you can compare year to year and show a painter.

If you spot a few of the signs above, get a quote before the damage spreads. Fixing a few boards and repainting costs a lot less than replacing rotten timber. Homes built before the 1970s may have lead in old paint layers, so get any old paint tested before it is sanded or scraped.

True Shine Painters gives free quotes across Melbourne's west and can take a look at what your exterior needs.