How Long Does Exterior Paint Last and What Affects It?

There is no single lifespan that applies to every house. Exterior paint lasts longer or shorter depending on how the wall was prepared, the quality of the paint, the climate and how exposed the façade is. With good preparation and maintenance, it can last many years. Without them, it can fail much sooner.

What matters most for lifespan

Almost always, what decides it is what was done before the tin was opened. If the wall was dirty, damp or had loose render, the new paint will not bond well, however good it is.

The role of climate and exposure

Strong sun fades colours and ages the paint film. Rain and damp encourage mould, algae and peeling. The wind carries dust and, near the coast, salt.

On the same house, the walls do not all age at the same rate. South- and west-facing walls get more sun. North-facing and shaded walls stay damper. It is normal for some walls to need touching up before others.

Colour matters too

Very dark or very vivid colours tend to show sun wear more and heat the wall up more. Light colours usually hide dust and fading better. That is another reason why it is worth asking for advice about paints for the colour you want to use.

How to make the paint last longer

  1. Choose good-quality exterior paint suited to your type of wall.
  2. Do the preparation properly and without shortcuts.
  3. Repair cracks and leaks before painting.
  4. Apply the number of coats the manufacturer recommends.
  5. Wash the façade from time to time with water and a soft brush.
  6. Touch up small flaws as soon as they appear.

Signs that it is coming to the end

When it starts to fade, powder comes off when you run a hand over it, or mould or small cracks appear, the paint is losing its protection. It is still a good time to act, before the paint peels. If you wait too long, the preparation becomes bigger and the job more expensive.

A quick annual check helps a lot. Walk around the house and look at the eaves, window sills, exterior skirting and corners. Take photographs, so you can compare from one year to the next.

What you should not expect

No exterior paint lasts forever, nor does it cope well with damp render or cracks left unresolved. If a company promises you an exact lifespan without seeing your house, be wary. The honest answer is that it depends on the condition of the wall and the conditions at the site.

Tip: Keep a small tin of the paint used, with the colour reference and the date. It makes touch-ups much easier later.

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