What does it cost to replace windows? 

In 2025, the price of replacing a window varies depending on the window’s size, material, type of glass and whether special adaptations are required. In general, you can expect the price of a standard PVC window to start at around NOK 3.000 – 5.000, – per window, excluding installation. For wood-framed windows, the price increases to around NOK 5.000-8.000, while aluminum frames can cost even more, depending on specifications. 

Installation costs will probably vary from job to job depending on how complicated it is and whether extra work is required. Extra work may include, for example, replacing the frame, adapting to non-standard dimensions or special aesthetic requirements. A good starting point is to assume that the installation cost will be around NOK 2.000 – 4.000 per window for standard installations. It is also important to consider the additional costs of removing old windows and any additional insulation. 

Energy-efficient and sound-insulating windows cost more but can be a good investment in the long term through reduced energy costs. For these windows, the price, including installation, can start from NOK 8.000 and up per window. It is recommended that you obtain several quotes to compare prices and services, and also assess the potential energy savings and comfort improvements against the cost of the project. 

What affects the price of window replacement? 

Replacing windows is an investment that can improve your home’s energy efficiency, aesthetics and value. The price you pay will vary, and here are some of the key factors that influence this: 

What does it cost to replace glass in a window? 

The price of replacing window glass depends on the size and type of glass, as well as special features such as energy efficiency or sound insulation. Small windows start from around NOK 500-1.000, while larger or customized glass can cost from NOK 2.000 and upwards. To find the best price, you should get several quotes. High-quality windows contribute to energy savings, which can justify a higher purchase cost. 

How often should windows be replaced? 

There is no set rule for how often windows should be replaced, as this depends on several factors such as window quality, maintenance and exposure to the elements. However, there are certain signs that suggest it may be time to consider replacement: 

• Poor insulation: Drafts around the windows or a noticeable chill near the window can indicate poor insulation. 
• Condensation between the glass layers: This suggests that the seal has been broken, reducing the insulating properties of the window. 
• Difficult to open or close: Windows that are difficult to use often have a faulty mechanism or a frame that has distorted over time. 
• Rot or damage to the frame: Signs of water damage, rot, or other physical damage to the frame can destroy the structural integrity of the window. 
• High energy bills: Old or inefficient windows can lead to increased heating and cooling costs. 
• Soundproofing issues: If outdoor noise is becoming more noticeable, your windows may not be insulating as well as they should. 
• Aesthetic considerations: Windows that look old and worn can negatively affect the appearance and value of your home. 

If you’re experiencing one or more of these issues, you may want to consider replacing your windows to improve your home’s comfort, energy efficiency and value. 

How long does it take to replace a window? 

The time it takes to replace a window depends on the size and type of the window, whether any adjustments are needed to the frame, and the experience of the people doing the work. For a standard window, without the need for major customization, an experienced craftsman can often complete the job within 2 to 4 hours. 

If additional adaptations are required, such as adjusting the opening, repairing rot damage or adapting special window types, it may take longer. It’s also important to factor in preparatory work and any finishing work, which may include painting or sealing. 

For a more precise estimate, it’s best to consult with a professional who can assess the specific circumstances of your window project. 

Which window is best? 

The “best” window depends on your specific needs, preferences, and the climate where the window will be installed. Here are some important factors to consider when choosing the type of window: 

1. Energy efficiency 

• Double or triple glazing: Provides better insulation than single glazing, which is important in cold climates. 
• Gas fillings: Argon or krypton between the glass layers improves insulation. 
• Low-E coating: Reflects infrared light, keeping heat in during winter and out during summer. 

2. Materials 

• PVC: Low maintenance cost and good insulation performance but may be less attractive to some. 
• Wood: Classic look, good insulation, but requires more maintenance. 
• Aluminum: Modern look, very durable, but can conduct heat and cold if not thermally broken. 
• Composite: Combines materials to optimize durability and energy efficiency. 

3. Design and aesthetics 

The choice of design can affect both the appearance and functionality of the house. Consider how the window opens (slide, tilt, swing, etc.) based on your preferences and space requirements. 

4. Sound reduction 

Especially important in noisy areas. Double glazing layers and special gas fillings can reduce sound penetration. 

5. Safety and security 

Consider locking mechanisms and tempered or laminated glass for increased security. 

6. Budget 

Your budget will naturally play a big part in your choice of windows. Consider the total value, including energy savings over time, against the initial investment. 

7. Climate 

Your geographical location and the specific weather conditions there may dictate the need for certain types of windows over others to optimize comfort and energy efficiency. 

You may want to discuss your needs with a window expert who can recommend the best solution for you. 

Should you choose 2 or 3-layer windows? 

The choice between 2-layer and 3-layer windows largely depends on your personal needs and the local climate. 2-layer windows balance cost and energy efficiency, making them a good choice for those on tighter budgets or those living in milder climates. 3-layer windows are the best solution for maximum energy efficiency and comfort, especially in areas with harsh winters and/or high ambient noise. These windows provide better sound insulation, which can be a comfort in urban areas. The initial cost will be higher with 3-layer windows, but the potential savings on energy bills over time will likely justify the investment. 

Is it legal to replace windows yourself? 

You can replace windows yourself, but it’s important to comply with current building regulations and apply to your local authority if necessary. Correct installation ensures good energy efficiency and safety. Incorrect installation can lead to draughts, moisture and energy loss. If in doubt, consider consulting or hiring professionals to ensure the work meets all technical standards and avoid potential problems. 

Does replacing windows require an official application? 

In Norway, you don’t usually need to apply to replace windows as long as you don’t change the size, shape or appearance of the facade. Changes that affect the character or safety of the building may require approval from the municipality. Always check with your municipality for specific rules before starting work. 

Frequently asked questions about window replacement: