Painting Sash Windows: Guide & Tips

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Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

Why Trust Sash Window Refurbish?

Sash Windows Refurbish specializes in providing repair and restoration services for wooden windows and doors in the UK, as well as various types of carpentry. During the process of fulfilling orders, we utilize a range of tools and paints, including saws, sprays, primers, resins, and adhesives. With more than 20 years of experience in carpentry, we have tested and used various brands and types of work tools, making us well-equipped to offer helpful advice on selecting the right tools and paints for your needs. Read more ...

We understand that painting sash windows is a frustrating and challenging task. However, I am here to help you avoid potential pitfalls that may arise. One common annoying issue often arises with sash windows is when they become stuck or don’t operate smoothly.

This can be quite inconvenient and frustrating, but I have a comprehensive guide on the painting methods to create a clean and fresh look for your windows.

It’s important to note that different sash window types may require slightly different painting methods, and some may not need any painting. For instance, timber windows are prone to flaking over time, whereas UPVC windows will likely not require painting, depending on your preference.

See also: Uk Paint Brands

Our Guide To Sash Windows Painting

Before painting sash windows, there are a few important guidelines to remember:
  • Prepare your space. Consider using a sheet or plastic covering to protect the floor from accidental paint drops.
  • Consider sanding the casements to move any flaking paint. Suppose the window is already in good condition; taking off the existing may not be required.
  • Clean the area. This will prevent any dust from getting into the paint.
  • Paint with short brush strokes. This technique will give you a cleaner finish.
  • Remove any handles or locks. This helps in achieving a smooth and tidy paint job.
  • Run masking tape along the exterior edge of the casements. This ensures the walls are protected from any paint.

Start by pushing the lower section of the sash window to the top and painting it first. This will allow you easy access to all parts of the frame, ensuring thorough and even coverage.

Following these guidelines will help ensure your windows painting project for the sash windows goes smoothly and results in a clean and professional finish.

However, despite following the procedures above, remember these 5 tips when painting oil to achieve outstanding results:
TIP 1 - Masking tape can also protect draught-proofing or Weatherfin from paint.

See also: Best Masking Tape For Painting

Removing the Old Paint

To repaint your entire window, first, remove the old paint from the sashes and frame. Keep in mind that the paint may contain lead. Therefore, wearing a suitable protective dust mask is important for your safety.

TIP 2 - When using a heat gun for removing paint, ensure you don't expose elements of Sealing System to excessive heat.

Send the Timber

To ensure a clean line when painting, follow these steps after sanding the window frame:

  • Brush away any dust from the frame
  • Moisten a sponge with water (no soap)
  • Wipe the frame down with the moist sponge
TIP 3 - Consider using medium-grade sandpaper for abrading your wood windows.

Mask the Glazing

To make sure of a hassle-free and efficient painting job, consider protecting the sash window from paint. This ensures your valuable time is saved by eliminating later paint removal through these steps.

  • Start by using masking tape to cover the glass pane of the sash window.
  • Be sure to leave approximately 1 mm of glass exposed around the edges.
TIP 4 - Overlap the final coat of paint by 1 mm for a watertight seal.

Give Your Windows a New Coat of Paint

To ensure a high-quality finish and protect the timber of your sash windows, use a bonding agent, a decorative and a finishing coat. Sash Window Refurbish recommend using Teknos primer. When painting, be cautious to avoid painting your glazing other than for the last overlapping coat which is about 1 mm of the glass. This overlapping technique helps protect the seal.

TIP 5 - Sash trim brushes make painting tight spaces and corners easier.

See also: Best Anti-Mould Paint

Additional Tips

To ensure a professional paint job for your sash windows, consider these additional recommendations:
  • Prevent sticking. Avoid windows sticking when opening and closing by applying an even layer of paint to all parts of the window and following the correct painting order.
  • Clean and lubricate. After the paint is dry, clean the casement gently with a detergent. This aids in maintaining the sliding mechanism and removes dust that landed on the surface while painting.
  • Safety during exterior painting. Painting your window exterior is more challenging than the interior. Therefore, ensure to follow proper safety measures where possible, like using scaffolding.
  • You shouldn’t worry about the glass. Suppose you accidentally get paint on the glass. Relax! It’s easily removable using a chemical paint scraper or even a razor blade.
About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.