How often should a house exterior be painted?

There is no set number of years. Repaint when the paint has worn thin or started to fail, and touch up small problems as soon as you see them. On sound wood with good preparation, a primer and two quality topcoats commonly last 10 to 20 years on a wall, but the sunny sides, sills and dark colours wear out sooner, and the shaded sides later. A yearly look tells you more than a calendar.

How long paint lasts

The USDA Forest Products Laboratory's Wood Handbook gives typical service lives on vertical wood surfaces of 10–20 years for paint and 6–15 years for solid-color stain,^[1] and 4–8 years for semitransparent stain on saw-textured or weathered wood.^[1] It stresses that service life depends on surface preparation, climate and exposure, amount and quality of finish, and the wood species and its surface texture.^[1]

With everything done right, the numbers get long. A three-coat finish system (0.10 to 0.13 mm thick) should last 20 years.^[1] Many three-coat paint systems in tests at FPL have lasted 30 years.^[1]

Older guidance is shorter. The National Park Service's brief on historic woodwork, written when oil paints were standard, describes exterior paint as requiring re-application every 5-8 years.^[2]

Repaint by condition, not by date

The handbook's rule: Refinish exterior wood when the old finish has worn thin and no longer protects the wood.^[1] In practice, When the topcoats begin to wear thin, exposing the primer, reapply one or two new topcoats.^[1] If paint is cracking, blistering or peeling, it needs attention sooner, and the cause should be found first; see why exterior paint peels.

Some chalk is normal. The Park Service calls it healthy aging: In moderation, chalking is the ideal way for a paint to "age," because rain carries dirt away with the chalk.^[2] Heavy chalk that rubs off thickly on your hand means the paint is wearing out.

Colour alone is not a reason. In the Park Service's words, nor is color fading, of itself, sufficient justification to repaint,^[2] though Many dark-colored finishes may fade to give unacceptable performance long before the finish fails.^[1] If you want paint that looks good longest, the handbook's advice is short: "White is always a safe choice."^[1]

Different walls, different schedules

You rarely need to repaint the whole house at once. Paint erodes at different rates, so different sides of a structure do not need to be painted on the same schedule.^[1] Paint on the shaded side often lasts twice as long as that on a fully exposed, sunny side.^[1] For porch ceilings, soffits and walls under deep eaves, Repainting protected areas every other time the structure is painted usually gives adequate performance.^[1]

Within a wall, the flat parts take the most weather. The Park Service notes that horizontal surfaces such as window sills wear faster and need repainting more often than less exposed surfaces.^[2] Sills, railings and the tops of trim often need a touch-up between full repaints; see how to keep exterior trim from rotting.

Painting too often causes problems too

More coats do not mean more protection once the paint is sound. The handbook is direct: "Do not paint too often. If paint is sound, but discolored with mildew, wash it. It does not need repainting."^[1] Too many coats of latex paint can eventually lead to adhesion failure of the primer.^[1] The Park Service adds that When paint builds up to about 1/16 inch, roughly 16 to 30 layers, one or more extra coats may be enough to trigger cracking and peeling.^[2]

A yearly routine that stretches the cycle

The Park Service recommends that owners inspect exterior walls, porches and windows once a year, in spring, before the summer and fall painting season.^[3] Cleaning is part of the maintenance: To help extend a repainting cycle, dirt and spider webs should be removed before permanent staining occurs.^[3] Wash with a mild detergent and a soft brush rather than high pressure; how often to pressure wash a house covers when washing helps and when it harms.

Do not let small failures sit. About a south-facing wall with failing paint, the Park Service warns: "Postponing such work will lead to further paint failure, require greater preparatory costs, and could even result in the need to replace some siding."^[3]

On a house built before 1978, the yearly check doubles as a lead check. The EPA says lead-based paint in good condition is not a hazard,^[4] but Owners and occupants should regularly monitor and check for deteriorating paint (paint that is peeling, chipping, chalking or cracking).^[4] Use lead-safe methods for touch-ups.

Stop and call a pro if

• Paint is peeling to bare wood over large areas, or on a house built before 1978 where children live.
• You find soft wood in sills, trim, fascia or siding during the spring check.
• The worn areas are on second-storey walls, gables or anywhere you would need a tall ladder or roof access to reach.
• Peeling keeps coming back in the same spot within a year or two of painting, which points to a moisture problem behind the wall.

When it is time, how to prep a house for exterior painting and what exterior painting costs in Virginia will help you plan. Browse exterior painters, look up painting businesses around Blacksburg, or read more exterior answers. To get it done, describe your exterior painting job once and licensed local businesses can quote it.