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Everything you need to know before installing new windows in your home

Installing new windows can do incredible things for a home.

Not only do they improve the appearance of your property and give you a crucial style upgrade, but the right windows improve your energy efficiency levels too. That could be extra important to your household right now, as electricity and heating bills continue to rise.

While installing new windows can be an excellent investment, it’s important to make sure you have the right plan in place before you dive in. After all, windows can be an expensive purchase, particularly if you’re replacing multiple panes in different parts of your home.

Here are a few things you’ll need to know before you get started.

1. How to Choose the Right Type of New Window (Double vs. Triple Glazing)

First, you’ll need to think about the types of windows you want to install. Think about where you live and the kind of issues you want to solve with your windows. Do you need sound-proofing to help keep your home relaxed and peaceful when living on a busy street? Maybe you’re concerned about security, and want a set of more resilient windows? If you’re replacing the windows in your home with something more energy efficient, you might want to look into window styles designed specifically to be eco-conscious. Double-glazed or triple-glazed windows are often a good choice. You can also look into designs which come energy-rated, to give you some peace of mind when it comes to energy performance.

2. What Sort of Style Is Right for You?

Windows don’t just come in different “types”, they’re also available in various styles. It’s up to you which route you go with your window aesthetics, but you’ll need to consider multiple factors, from the kind of glass installed, to the surrounding frames.
If you’re starting from scratch with brand-new windows in a fresh-built property, you’ll have virtually unlimited options to choose from. You can look into tilt-and-turn windows, fully reversible windows, or timber-style windows. If you’re adding windows to a newly-built portion of your house, you might want to make sure the style matches the rest of your home.

3. Focus on Longevity

In a time of massive inflation, it’s tempting to try and cut costs when making upgrades to your home. However, the last thing you want to do is end up replacing your windows just a few years after you install them. Different types of windows have different life spans, so it’s worth looking into how long your new investment is going to last. An economy window might begin to lose its seal and efficiency after a few years, which means you’ll need to pay for extra repairs and maintenance. It’s also a good idea to remember that the installation of your windows will contribute significantly to how long they last. Paying a professional to ensure your windows are installed correctly will help you to avoid some common problems later on.

4. Decide on the Number of Windows You Need

If you’re replacing your existing windows with newer, more stylish, and energy efficient alternatives, you’ll need to think about how far you want to go with the replacement. Replacing a window one at a time can sometimes seem like the more economical option. However, this could also mean you end up with a house that looks a little odd from the outside. Investing in replacing multiple windows at once can help you to preserve your home’s aesthetic, as well as making a more significant difference to your energy bill. Getting more of your windows done at the same time will also ensure all of your frames and glass options share the same consistent style, so you’re less likely to end up with a mis-match.

5. What is the Best Time of Year for Window Installation?

Getting the timing right is often an important concept when you’re replacing your windows. The best installers will work with you all throughout the year. However, you might find it’s much easier to deal with the strain of replacing multiple windows during the summer or spring months, when the weather is less likely to be a problem. You might also want to consider replacing windows at the same time when you’re making other upgrades to your home. For instance, if you’ve just changed the doors in your home for aesthetic and energy efficient purposes, you could get a good deal by changing the windows too.

6. You May Need to Make Some Preparations

Preparing for your window replacement can be an important part of making sure the installation goes smoothly. If you’re installing new windows in an existing room of your home, then you’ll need to remove all the blinds and curtains from the opening. You should also remove any obstacles which might get in the way of your installers as they work. Ideally, move the furniture away from your windows, and ensure your installers will have plenty of access to all the space they need. It’s also a good idea to get pets moved out of the room where your windows are going to be installed. You don’t want to have to chase your cat down the street after it leaps out of the window.

7. How to Hire a Certified & Professional Window Installer

More than anything else, the one factor that will make or break the success of your window installation, is the professional you choose to do the job. The right installation company will ensure you know everything there is to know about your window options, so you can make the right choice.They’ll also provide guidance on how to maintain and preserve your windows. Most importantly, a good team of professionals will work hard to ensure your windows are installed to the highest quality standards, so you don’t have to worry about potential issues with drafts or repairs too early in the future.

🏡 Reasons Why a Consumer Would Choose KJM Windows

1. Trust and Reliability (Accreditations & History)

KJM has spent decades building a trustworthy reputation, backed by leading industry bodies.

Longevity and Experience: Formed in 1983, KJM is a long-established company with over 40 years of experience. The current sole owner has been in the glazing industry since 1983.
Top Credentials: They are a Which? Trusted Trader and members of the Glass and Glazing Federation (GGF). These accreditations signal high standards of service and quality.
Proven Track Record: They have installed over £95,000,000 worth of glazing products, demonstrating massive customer trust and scale.
Robust Warranty: They provide a comprehensive 10-year insurance-backed warranty, offering peace of mind.

2. Product Quality and Choice (Material Agnostic)

Unlike some competitors who only push one material (e.g., uPVC), KJM offers a diverse, high-quality range.

Diverse Material Options: They don’t just sell one material. They offer windows and doors in uPVC, Timber, and Aluminium, ensuring the customer gets the best product for their home’s style and needs.
Focus on Efficiency and Security: Their product range is centered on low maintenance, energy-efficient (Double and Triple Glazing), and secure glazing solutions.
Award-Winning Recognition: They have been finalists for multiple prestigious awards, including G11, G13, G14, and G15 Installer of the Year, showcasing external validation of their quality.

3. Ethical and Low-Pressure Sales Approach

Their sales philosophy is designed to prioritize the customer’s comfort and trust.

“No Pressure Promise”: KJM operates with a “no hassle, no pressure” approach to all quotations.
Transparent Pricing: They are explicit that they offer “good honest pricing,” avoiding the industry cliché of “hype or special ‘buy one get one free’ offers.”
Sales Integrity: They often do not provide prices in the home, which removes the high-pressure, on-the-spot sales tactics common in the industry.

4. Local Expertise (Andover & Hampshire)

For consumers in the local service area, KJM is a known and approved entity.

Local Approval: They are Hampshire Trading Standards approved, which is a powerful local trust signal.
Community Presence: Being based in Andover, Hampshire, since 1983, they have deep roots and knowledge of local building styles and planning requirements in the South of England.

In summary, a consumer chooses KJM because they are looking for a reliable, experienced company that offers high-quality products across different materials, all delivered with an honest, pressure-free sales experience.

Contact us today to discuss your window needs.

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Mark Pearce

With over four decades in the glazing industry, Mark Pearce has been at the heart of KJM Windows & Conservatories since 1983. Starting as a building labourer, he quickly rose through the ranks, working as a window and door installer from 1984, a factory operator manufacturing windows later that year, factory manager in 1992, and joining the sales team in 1994. Becoming a Director in 2002, and finally, the sole owner in 2010, Mark Pearce is truly a double glazing expert and has led KJM to become a leading supplier of high-quality windows, doors, and conservatories across Andover and the South of England.

Mark Pearce is a highly experienced specialist in the double glazing industry, having built his knowledge from the ground up through hands-on experience in installation, manufacturing, sales, and business management. Beyond his role at KJM, Mark is a keen blogger, writer, and traveller, often sharing insights on the latest innovations in the home improvement industry.

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Timber - PVC - Aluminium - Windows, Doors & Conservatories in Dorset

Everything you need to know before installing new windows in your home