8 Questions to Ask Your Double Glazing Installer

Published 5 March 2024 by Laura

8 Questions to Ask Your Double Glazing Installer

Opting for any home improvement entails both considerable time and financial investment. Therefore, it’s crucial to work with professionals who have extensive expertise in their field. It is also important to do as much research as possible before making any decisions.

If you’re considering installing double glazing in your home, you’ve likely realised the importance of finding a reliable and reputable installer. With numerous options available, it’s essential to ask the right questions to ensure you’re making an informed decision. To help you navigate this process, we’ve compiled a list of eight questions to ask your double glazing installer.

A trustworthy installer will willingly address all queries, demonstrating their pride in sharing industry knowledge and expertise.


1. How much experience do you have in the industry?

Understanding the installer’s level of experience can provide insight into their expertise and reliability. Look for companies with a proven track record and extensive experience in the double glazing industry.

With over 50 years of experience in manufacturing quality double glazing products, Sternfenster stands as a trusted name in the industry. Our decades-long commitment to excellence has solidified our reputation for delivering superior windows and doors that exceed expectations. Moreover, we take pride in our rigorous vetting process, independently verifying all approved installers within our network. This meticulous approach ensures that every installation of our products is carried out to the highest standards, offering you peace of mind knowing that your home is in capable hands.

2. Can you show me examples of your work?

Requesting examples of previous projects allows you to assess the quality of the installer’s workmanship. This visual representation can help you determine if their style and standards align with your preferences and expectations. If you choose an installer with links to a showroom, you will have the opportunity to experience your windows and doors before they are installed, giving you ultimate peace of mind. You might find though that in today’s digital age, not all installers maintain traditional brick-and-mortar shops. However, reputable installers should readily provide brochures, samples, and photographs of recent installations upon request, serving as valuable sources of inspiration for your project.

Cost of Aluminium Windows

3. Do you have any customer testimonials?

Reading testimonials and reviews from previous customers can provide valuable insight into the installer’s reputation and customer satisfaction. Positive testimonials indicate reliability and quality service. When researching potential installers, it’s essential to explore recent online reviews and also delve into how the installer has addressed any negative feedback. Home improvement projects can encounter hiccups, and a single negative review doesn’t necessarily reflect the installer’s overall quality. It’s worth noting that people tend to voice their dissatisfaction more prominently than their satisfaction. Negative reviews provide insight into how the installer handles challenges, ensuring they fulfil their contractual obligations and rectify any issues promptly. This scrutiny allows you to gauge the installer’s commitment to customer satisfaction and their willingness to resolve problems effectively.

4. Where do you source your windows from?

Understanding the source of the windows can give you confidence in their quality and durability. Reputable installers often partner with trusted manufacturers known for producing high-quality double glazing products.

At Sternfenster, we bring over five decades of expertise to window manufacturing, having started our journey in 1974. With such extensive experience, we’ve honed our craft and developed a keen eye for sourcing only the best profile systems and materials. We pride ourselves on partnering exclusively with reputable suppliers, guaranteeing that the materials used for our windows and doors are of the highest quality. This meticulous approach ensures that every component of our products meets our stringent standards for excellence, providing you with peace of mind in the longevity and performance of your home improvements.

5. How much will it cost?

Request a detailed breakdown of the costs involved, including materials, labour, and any additional fees. Ensure there are no hidden costs and that the quote is transparent and competitive.

The size of your windows and doors, materials, colour choice and any hardware accessories will all be contributing factors to determining your final double glazing quote. The cost of windows can vary, but we are on hand to help you find the best price for you.

In our resource section, you can find a variety of guidelines to the cost of price for the different products that we offer.

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Are you wondering about the price of windows and doors? Our windows range on average between £643.50 to £1,650. To determine how much new windows cost, take a look at our online window quote cost guide today. At Sternfenster, we make your home improvements journey easy!

6. What guarantees do you provide?

Enquire about the warranties and guarantees offered on both the product and the installation. A reputable installer should provide comprehensive guarantees to protect your investment and provide peace of mind.

At Sternfenster, we go above and beyond to ensure customer satisfaction by offering industry-leading warranties. By choosing an installer from within our approved network, you can rest assured that your products come with a great warranty, further enhancing your confidence in the quality and durability of your double glazing installation.

7. What energy efficiency rating do your windows achieve?

Energy efficiency is a key consideration for double glazing installations. Ensure that the windows meet or exceed industry standards for thermal performance, helping to reduce energy bills and carbon footprint.

One way to assess the energy efficiency of windows is through Window Energy Ratings (WERs). These ratings provide a convenient and standardized measure of a window’s thermal performance, indicating its ability to retain heat and prevent heat loss. By choosing windows with high WERs, you can maximise energy efficiency in your home, leading to potential savings on heating costs and reducing environmental impact.

8. How secure are your windows?

Security is paramount when it comes to protecting your home and family. Be sure to ask about the security features incorporated into the windows, such as multi-point locking systems and laminated glass, to ensure maximum protection against intruders.

Additionally, look for windows that are certified by Secure by Design, a police initiative that promotes crime prevention through effective security measures in the design and construction of buildings. Choosing windows endorsed by Secure by Design provides added reassurance that your home is equipped with robust security features, enhancing peace of mind for you and your loved ones.

Make an Informed Choice for Quality Double Glazing Installation

By asking these eight questions, you can make an informed decision when choosing a double glazing installer. Remember to take your time, compare options, and choose a company that prioritises quality, reliability, and customer satisfaction. Investing in high-quality double glazing can enhance your home’s comfort, energy efficiency, and security for years to come.

Contact us today to find out more about our prices for windows and doors. We are proud to offer competitive and free prices, allowing you to find the ideal cost for you.

You can also find your nearest Sternfenster Approved Installer via our dealer search function. Our network of Approved Installers will always reflect our exceptional window and door prices.

We’ll be able to tailor your window quote to perfectly match your specifications, which will make sure your price is as cost-effective as possible. This way, you won’t have to pay extortionate prices for premium products. We allow you to enjoy the best, for less.

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