How do I choose windows for my new or renovated home?


Choosing windows for a new or renovated home is one of the key decisions that will affect the comfort, energy efficiency and aesthetics of the building for years to come. There are a number of technical, functional and aesthetic factors to consider in the process. Below is a comprehensive guide to help you make an informed decision.

Technical parameters

heat transfer coefficient (Uw)

This is a measure that determines how much warm air escapes from the building interior through a window. The lower the Uw value, the better the thermal insulation of the window. For modern energy-efficient buildings, windows with a Uw value below 0.8 W/(m²K) are recommended.

Acoustic insulation (Rw)

The Rw parameter indicates the window’s ability to dampen noise from outside. A high Rw value is particularly important for homes in noisy locations – a city centre or a house next to a busy road.

Light and solar energy transmittance

These parameters determine how much natural light and solar heat penetrates through the window into the building. These values are important for optimising the use of daylight and solar heat, which have a significant impact on the energy efficiency of a building and therefore the costs associated with bills.

Materials and construction

The choice of window materials and construction is fundamental to the durability, energy efficiency, aesthetics and overall functionality of windows in the home. Which materials will work best?


Aluminium is prized for its strength, light weight and minimal maintenance. Its modern, sleek appearance works well with a range of architectural styles, from classic to ultra-modern. Aluminium is also a highly weather-resistant material, ensuring its longevity. In addition, aluminium profiles can be fitted with thermal break bridges that significantly improve thermal insulation, making them a suitable choice even for energy-efficient homes.


PVC windows from Lodz are popular for their value for money, excellent thermal insulation and ease of maintenance. They are lightweight, require no painting and are corrosion resistant. The multi-chambered PVC profiles provide additional thermal and acoustic insulation. They are available in a wide range of colours and finishes, including imitation wood, to suit a variety of architectural styles.


Glazing plays a key role in the performance of windows. Double glazing is standard, offering good thermal and acoustic insulation. Triple glazing, although more expensive, provides even better insulation and is recommended in regions with extreme climatic conditions.

Seals and fittings

High-quality seals and fittings are essential for the tightness, safety and ease of use of windows. Seals should be weather and age resistant to provide long-lasting protection against air and water leakage. Fittings (hinges, handles and locks), should be robust and functional, allowing windows to be easily opened, closed and locked.

Price and quality

When considering the purchase of windows for a new or refurbished home, a key aspect is to understand the relationship between cost and quality. The choice of windows should not be based solely on the price for the purchase itself, but also on an assessment of the long-term value and savings they can deliver.

Initial investment versus long-term costs

The cheapest windows on the market are often not the best choice in the long term. A low initial price can mean lower quality materials, poorer thermal and acoustic insulation, and a shorter product life. In contrast, investing in more expensive but high quality windows can result in significant savings on heating and cooling your home through better thermal insulation and energy efficiency.

Durability and maintenance

Costs associated with maintenance and potential repairs are also an important part of long-term costs. Windows made from high-quality materials, such as aluminium or high-quality uPVC, require less maintenance and are more resistant to the elements. In the long term, an investment in such windows may prove to be more economical, despite the higher initial price.

Resale value of the home

High-quality windows can also increase the resale value of a property. Modern, energy-efficient windows are an attractive asset to potential buyers, which can translate into a higher selling price for your home.

Guarantees and after-sales service

It is also worth considering the length and extent of the warranty offered by the manufacturer. A longer warranty may be a sign of the manufacturer’s greater confidence in the quality of its products. In addition, the availability of an after-sales service and ease of access to spare parts are important factors that can affect long-term operating and maintenance costs.

Window selection – a decision for years

Choosing windows for a new or renovated home requires careful consideration of many aspects. From technical performance, materials and design to aesthetics, security and cost. By making an informed decision, you can ensure comfort, security and energy efficiency for years to come.

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