How to Fit Upvc Windows: The Ultimate Guide.

To fit upvc windows, accurately measure the window opening and select the correct size of the window. Next, fix the window frame into the cavity and level it using wedges.

Screw the window and frame to the wall, leaving space for adjustment, and add silicone sealant to the edges. Fitting upvc windows is a task that should not be undertaken lightly. A proper installation ensures that the windows are secure, fit perfectly and are energy-efficient.

Upvc windows installation is a step-by-step process that starts with taking accurate measurements of the window opening. Choosing the right size of the window is essential for the best results. Afterward, the correct installation of the window’s frame is crucial, ensuring it is level and plumb, screwed to the wall and adding the sealant for the window’s edges. These steps must be done with great attention to detail for optimal results.

Measuring For Upvc Windows

Finding The Right Size

Whether you’re installing new windows or replacing old ones, measuring for upvc windows is a crucial step in the process. Without accurate measurements, you’ll end up with ill-fitting windows that might not look good or function properly. Here’s what you need to know about measuring for upvc windows.

Importance Of Accurate Measurements

Measuring for upvc windows might seem simple, but it’s essential to ensure a proper fit. Incorrect measurements can lead to windows that are too big, too small or don’t fit at all. This can cause a range of issues, such as drafts, leaks, and even damage to the windows and the surrounding areas.

Tools Required For Measuring

Before you begin measuring, make sure you have the right tools on hand. Here are the tools you’ll need for measuring upvc windows:

  • Tape measure
  • Spirit level
  • Pencil
  • Paper

Step-By-Step Guide To Measuring For Upvc Windows

Follow these simple steps to get the correct measurements for your upvc windows:

  • Measure the width: Measure the width of the window frame from the outer edges of the brickwork, making sure to measure in three different places. Record the smallest measurement.
  • Measure the height: Measure the height of the window frame from the base to the top of the window frame in three different places. Record the smallest measurement.
  • Check for squareness: Check the squareness of the window frame by measuring the diagonals. If the difference in measurements is less than 5mm, the frame is square.
  • Measure the depth: Measure the depth of the window reveal from the back of the reveal to the front edge. Record the measurement.

Tips For Ensuring Accurate Measurements

Here are some tips to help you ensure accurate measurements when measuring for upvc windows:

  • Make multiple measurements: Make sure to measure in at least three different places and record the smallest measurement. This will ensure that your window fits correctly.
  • Use a spirit level: Checking for level at multiple points can help ensure that your measurements are accurate.
  • Take your time: Rushing can lead to mistakes, so take your time and be sure to double-check your measurements before ordering.

By following these steps and tips, you’ll ensure that you get the correct measurements for your upvc windows, resulting in a perfect fit. Happy measuring!

Preparing For Installation

Installing upvc windows can be a great investment for any home, not only enhancing the aesthetic value of the property, but also providing better soundproofing and insulation from the elements. In order to achieve the best results, it is crucial to prepare properly for the installation process.

In this blog post, we will go through the essential tools and materials you need, along with tips on how to prepare both the window frame and the opening, ensuring a smooth installation process.

Tools Required For Installation

Before starting the installation process, it is important to ensure that you have all the necessary tools. Here are the essential tools you need for installing upvc windows:

  • A drill
  • A screwdriver set
  • A measuring tape
  • A spirit level
  • A silicon gun
  • A hammer
  • A utility knife

Materials Required For Installation

Apart from tools, you also need to gather a few materials before starting the installation process.

  • Upvc window frame
  • Screws, brackets, and fixings
  • Window cill
  • Silicone sealant
  • Expanding urethane foam

It is stressed that you do not use a builder’s foam as it could damage upvc components.

Preparing The Window Frame For Installation

Before starting the installation process of the upvc window frame, you need to ensure that it is clean and free of any debris or dirt. Here is how to thoroughly clean the window frame:

  • Use a damp cloth to wipe down all parts of the frame to remove any stubborn dirt and dust.
  • Use a utility knife to remove any stubborn residue or adhesive on the frame.
  • Use a silicone spray to lubricate any areas on the frame that may cause difficulty during installation.

Preparing The Opening For Installation

To prepare the opening for installation, you need to remove the old window and inspect the condition of the wall. If there is any damage or rotting, it needs to be removed and treated. Then, you need to ensure that the opening is perfectly square and level, extending 5 mm beyond the upvc window frame.

Here are the steps to prepare the opening:

  • Break away any old silicone sealant from around the old window frame and remove the old window.
  • If there are any uneven surfaces in the opening, smooth them over with a plaster or filler.
  • Measure the opening and ensure that it is square.
  • Use a spirit level to make sure the sill is level.
  • Apply expanding urethane foam to the sides and top of the opening to ensure a tight seal after installation.

Cleaning The Window Frame

After the preparation process is complete, it is recommended to clean the window frame again to ensure a dust-free surface for installation. Use a silicone spray or silicone sealant to apply a thin film around the area where the frame will sit.

This will help to secure the frame and provide a tight seal after installation.

Proper preparation is key to ensure that the installation process for upvc windows goes smoothly. Gather the necessary tools and materials, clean the window frame, prepare the opening, and apply a thin layer of silicone sealant. By following these steps, you can ensure a perfect installation of your upvc windows.

Fitting The Upvc Window

Overview Of The Fitting Process

Fitting upvc windows might seem like a daunting task. However, with the right tools and knowledge, you can easily achieve the perfect finish. Some essential items that you need are:

  • Upvc window frame
  • Fixing screws
  • Silicone caulk
  • Measuring tape
  • Screwdriver
  • Spirit level
  • Sealant gun

Before you begin the installation process, make sure that you have all the necessary tools and equipment.

Step-By-Step Guide To Fitting Upvc Windows

  • Firstly, remove the old window frame and ensure that the opening is ready for the new upvc window.
  • Check the new upvc window frame’s size to ensure it fits the opening. If it doesn’t fit, trim the frame accordingly.
  • Install the window frame, ensuring that it is level and plumb. Use a spirit level to check the levelness and adjust accordingly.
  • Once the frame is in place, screw it into the opening using fixing screws.
  • Seal the window’s perimeter using silicone caulk applied using a sealant gun. Ensure that the sealant covers all gaps around the window frame.

Tips For Ensuring A Successful Installation

  • Measure multiple times to ensure accuracy before you cut anything.
  • Directly secure the frame into the brickwork, as screwing into the plasterboard may cause the window to become loose over time.
  • If you’re installing a window with a multi-point locking system, ensure that the handle is installed before fixing the frame to avoid any obstructions.
  • Check that the sash opens and closes properly.

Sealing The Upvc Window

Once the upvc window is installed, sealing is essential to prevent drafts and water leaks. Follow these simple steps for a successful seal:

  • Thoroughly clean the window frame and surrounding area.
  • Fill the gap between the brickwork and frame with foam backer rod to ensure that the sealant sticks firmly.
  • Apply high-quality sealant around the perimeter of the window.
  • Smooth the sealant with a caulk smoothing tool, ensuring that it is flush with the brickwork.
  • Allow the sealant to dry as per the manufacturer’s instructions.

Following these steps would ensure a seamless installation of your upvc window. The right installation and sealing techniques will keep your home warm, cost-effective, and free of drafts and leaks.

Testing And Adjusting Upvc Windows

Importance Of Testing Upvc Windows

Before adjusting upvc windows, it is crucial to test their functionality. Testing upvc windows doesn’t only ensure proper performance, but it also checks if the installation was correct, and if the windows meet the client’s specifications. The benefits of testing upvc windows are:

  • Prevention of energy loss and decreased utility bills
  • Prevention of water leaks and potential water damage
  • Ensuring proper insulation and air filter
  • Optimizing the window’s performance, guaranteeing comfort and convenience

Testing The Function Of The Upvc Window

The first step before adjusting upvc windows is to test their functionality. This step ensures that the window is working as expected and meets the client’s requirements. Here are some essential points to consider while testing the upvc window function:

  • Operate the window to determine its ease of use, confirming that it is opening, closing, and locking correctly
  • Check to see if there are any gaps or leaks around the window
  • Inspect the window for any visible damages such as scratches or cracks
  • Check if the window is water-resistant by spraying it with water to check for leaks

Adjusting The Upvc Window To Ensure Proper Function

After testing the upvc window function, it can be adjusted to ensure proper function. Adjusting the window involves making appropriate changes to the window to guarantee that it meets the client’s specifications. Here are some critical considerations when adjusting the upvc window:

  • Install new weatherstrips to replace any that are worn out or damaged
  • Tighten the locks to ensure the windows seal well and prevent air and water leaks
  • Check the hinges to see if they need adjusting. Adjusting the hinges can improve the window’s overall performance

Checking For Proper Insulation

Before concluding the upvc windows installation process, it is crucial to verify that the windows are well insulated. Proper insulation guarantees that there are no gaps between the window frames and the wall, thus preventing air leaks, energy loss, and noise pollution.

When inspecting the insulation, consider:

  • Check for drafts around the window frames to see if they need sealing
  • Check for gaps between the window frame and wall, and fill these gaps with expanding foam sealant
  • Install insulation around the window to prevent heat loss, optimize energy performance, and lower the electricity bills.

Fitting upvc windows can be a long, challenging process, but when it’s done right, they offer energy efficiency, security, and convenience. Testing and adjusting upvc windows ensure proper performance, guaranteeing the best experience for the client.

Frequently Asked Questions On How To Fit Upvc Windows

What Tools Are Needed For Fitting Upvc Windows?

You will need a drill, screws, a spirit level, a saw, a hammer, screwdriver, sealant, and cleaning products. Ensure safety gear is worn while working.

Is It Possible To Fit Upvc Windows Yourself?

Yes, it is possible to fit upvc windows yourself if you have the necessary skills and tools, and follow the correct procedures.

How To Know If A Upvc Window Is The Correct Size?

Measure the height and width of the existing window frame and compare it with the new upvc window size or measure the size of the opening in the wall.

How Do I Remove Old Window Frames Before Fitting Upvc Windows?

Use a pry bar and hammer to gently remove the old frame, and then use a saw to cut through any nails or screws. Clean the area to get rid of any debris.

Is It Necessary To Hire Professionals For Fitting Upvc Windows?

Hiring professionals for fitting upvc windows can ensure a better fit, security, and energy-saving benefits. However, it can be done diy if you have the necessary skills and tools.


To conclude, fitting upvc windows is not only a wise investment for your home, but it’s a great way to transform the look of your property. Whether you’re replacing old windows or renovating your home, this guide has provided you with all the essential information you need to know to get started.

Remember to take accurate measurements, choose the right type of window, and seek professional advice if you’re dealing with a more complex fitting job. Also, ensure you have the right tools and equipment before attempting the installation. Finally, make sure you’re following all the appropriate safety guidelines to avoid any accidents.

By following these steps, you’ll be able to fit upvc windows like a pro and enjoy the benefits of a well-ventilated, energy-efficient, and visually appealing home for years to come.

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