Repainting exterior windows: a guide for weather-exposed windows

The maintenance interval depends on the specific coating, detailing, condition and exposure. Flaking, cracked putty, exposed timber or moisture staining call for assessment. The related service is window painting in Ängelholm.

Three factors determine when your windows need repainting: orientation, timber condition and the existing paint type. A south-facing window in Kvidinge may face different exposure from other windows on the same building. Compare the actual elevations and condition rather than applying a fixed regional repainting interval.

Inspect vulnerable joints and lower sash edges for coating failure, damaged putty or soft timber. Damaged wood may require repairs or restoration before painting; repainting alone does not restore rotten timber.

Inspect the windows according to the coating system’s maintenance guidance and their actual condition. Record failed joints, putty or coating and ask whether local repairs or more extensive work are needed. For service scope and written terms, see window and door painting.

Preparation is determined by the existing coating and window condition: use compatible cleaning, remove unsound material, repair as required and follow the selected primer and topcoat instructions. No fixed percentage describes every job.

Adhesion depends on a suitable, sound and correctly prepared surface. The checklist below is a planning aid; follow the selected system for the actual window.

Start by cleaning the whole sash because paint will not adhere to dirt or mould spores. Then scrape off any paint that comes away; sound paint can remain. Sand transitions smooth so sharp edges do not show through the topcoat, paying particular attention to the lower putty rebate where water can collect.

Have failed putty and joints repaired with a compatible method. Treat exposed timber according to the selected system; an oil-based primer on the same day is not a universal rule. Any ROT eligibility depends on the actual work and customer; see what ROT covers for painting in 2026.

Use a window-paint system compatible with the actual surface and existing coating, with preparation, primer and topcoat specified together. Neither oil-based nor acrylic paint is best for every exterior window.

Exterior joinery products must be suitable for the substrate and exposure. Identify the existing coating and check documented compatibility before selecting preparation and a new system.

Choose from products intended for the actual window and its existing coating. Exposure and orientation matter, but they do not by themselves prescribe oil-based or acrylic paint. For the comparison, see acrylic versus oil-based paint for woodwork, setting out each system's strengths and limitations. Start with that guide if you are unsure which paint type to choose.

Colour affects lifespan more than many people expect. Dark sashes absorb heat, move more in sunlight and become hotter than light ones, causing faster wear on south-facing windows. A lighter shade in the same colour family can therefore extend the interval on the most exposed façade.

We match the system to the sash's timber species and existing coating, and explain the product and reason for choosing it before work starts. For the complete service, see window and door painting, step by step.

Mask the edges with painter's tape, protect fittings and follow the putty and paint system’s instructions for the joint at the glass. Any required paint overlap onto the glass is system-specific.

A clean painting result depends almost entirely on masking. Careless protection leaves paint on glass and fittings, so proper covering is part of professional work. The list below shows how a painter protects sensitive surfaces.

Protect glass and fittings without obstructing the specified paint-to-putty joint. Follow the putty and coating instructions for any overlap onto the glass; do not impose one measurement on every window system.

Remove detachable espagnolette fittings and handles where possible because paint around moving parts looks untidy and can seize the mechanism. Remove tape while the paint is still partly dry; once fully dry, it may pull flakes from the pane edge. This detail work takes time and is one reason many people hire a painter.

Exterior window painting may qualify for ROT when the work and customer meet the current conditions, while rot, work at height and historic windows require appropriate assessment and expertise. Ask for the agreed scope, price and any conditional deduction to be shown in the quote.

A practical homeowner can handle a few ground-floor windows during a dry summer week. However, several situations strongly favour a professional painter for both the result and safety:

• Work at height. Upper-floor windows require scaffolding or a mobile lift; a ladder is rarely sufficient for safe, thorough preparation.
• Rot in the sash. Soft timber needs restoration or replacement by someone who can distinguish surface greying from deeper damage.
• Historic windows. Original putty and linseed oil paint require traditional methods without shortcuts.

If you want help with access and preparation, ask the contractor to specify the work, repair documentation and any warranty terms in writing.

NLL Måleri AB in Kvidinge assesses the window work before agreeing its scope and price. Ask for scheduling and any warranty terms in writing. See the price information for window and door painting costs.