Bertrand Windows and Doors

How to care for wooden windows?

Wooden windows can delight many people, but despite this, most customers do not decide to buy them. Not only because of their higher price compared to plastic windows, but also because wooden windows require more frequent maintenance and care.

However, if this does not scare you in any way and the purchase of your dream wooden windows is already behind you or it is actually a formality, then you must read this article. We would like to show you how to care for wooden windows so that they retain their beautiful, natural appearance. We will show you not only proven products, but also great methods.

Regular maintenance of wooden windows allows not only to maintain their aesthetics, but also to extend their service life. Thanks to proper care, the windows will please our eyes for many years, while maintaining their functional and decorative values.

Regular cleaning

  • Washing window frames: Use mild detergent and warm water to remove dirt and debris. Avoid using aggressive chemicals that may damage the wood.
  • Cleaning the windows: Clean windows using a suitable window cleaner and a soft cloth or sponge.

Wood condition inspection

  • Regularly check the condition of wooden frames for cracks, chips, or signs of rot. Early detection of problems allows corrective actions to be taken quickly.

Painting and varnishing

  • Refreshing the paint coating: Renew the paint or varnish on wooden frames every few years (usually every 3-5 years). Remove old paint or varnish with sandpaper, then apply a new coat of paint or varnish.
  • Protection against moisture: Make sure you use high-quality exterior wood paints and varnishes that will provide protection against moisture and UV radiation.

Mold and fungus removal

  • If you notice mold or fungi on the wood, use specialized fungicides to remove them. Then thoroughly clean and dry the surface before applying a protective layer of varnish or paint.

Seals and fittings

  • Checking seals: Regularly check the condition of seals around windows. If they are damaged or worn, replace them to ensure good thermal and acoustic insulation.
  • Maintenance of fittings: Lubricate hinges, locks and other moving parts with specialized lubricants to keep them operating smoothly.


  • Make sure rooms are properly ventilated to prevent condensation on windows, which may damage the wood.

Protection against weather conditions

  • In case of extreme weather conditions (e.g. storms, frost), secure the windows additionally, e.g. by using external blinds or covers.

Repair of minor damage

  • If you notice minor damage, such as cracks or chips, repair them as soon as possible. Fill the cracks with special wood filler, then sand and paint.

Which products should you choose for maintaining wooden windows? We will present you the products we use in our company and which we recommend to our clients:

1. First – a cleaning product: Teknoclean 1951-00, which effectively removes dirt, grease and other contaminants from wooden surfaces. The product increases resistance to fading and yellowing, prevents moisture accumulation, and is resistant to wood shrinkage.

2. Secondly – a care product: GORI 690-31 Surface Maintenance, which gives new shine and protection to surfaces damaged by sun, rain and frost.

Now you know how to care for your wooden windows so that they remain in perfect condition for as long as possible.

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