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What Is the Window Installation Process?


by Alice

2022-12-17 06:07 PM

The window replacement process is a significant undertaking, but the payoff in aesthetic improvement can be substantial. We'll outline the time and money required, where to look for an installer, who are FENSA Approved Installers and why they matter, and other considerations associated with the window installation process.

As energy prices continue to rise, many homeowners consider upgrading their windows and doors a need rather than a luxury. You may save money on heating and cooling costs and increase your home's comfort with new window installation. As a bonus, they unite your house's inside and outside spaces.

Here are some hints about the window replacement process while covering the cost and certification factors.

Preparing for Window Replacement

window installation workers

Suppose you haven't replaced your windows in over a decade. Even if they are double-glazed, you may want to consider doing so because of the significant impact new windows can have on your home's energy efficiency and comfort.

The many uses of today's windows are a testament to their versatility. Depending on your preferences and budget, you'll be able to pick from a wide range of designs, materials, hues, and prices that will create a more relaxing atmosphere in your home.

Not only will the British Fenestration Rating Council (BRFC) energy ratings give you independent verification of how well your windows perform, but they come at a time when energy prices are expected to skyrocket. Keep in mind that windows only conserve more energy than they release if they have an 'A' rating or higher.

Window Replacement Cost in UK

worker installing window

Cost is the foremost concern for any homeowner when planning new window installation. New windows often cost too much for the average family to justify restoring the old ones. Depending on the type, you may pay £500 to £3,200 per window.

According to Checkatrade, the final price of window replacement can vary widely based on factors such as:

  • What is the frame made of
  • When installing a new window or replacing an old one,
  • Measurements of the replacement window's expanded frame
  • Regardless of whether or not you require scaffolding,
  • The design and style of a window
  • Irrespective of whether there is groundwork or building to be done
  • Price of setup
  • One's abode

Get quotes from FENSA-approved window fitters at Easefix to assess the total cost of window replacement. FENSA is a government-authorized scheme that ensures replacement windows and doors comply with building codes. When comparing prices, it's essential to make sure you're comparing apples to apples.

Following is a rough cost breakdown for replacing various window types, with the consultation of some experts:



Sash windows


Timber casement window


Timber sash window


Aluminium window


UPVC window


Aluminium sliding windows


Grey uPVC window


Bay window


Replace All Windows At Once?

window replacement

It is not necessary to replace every single window at once.

Companies that specialize in new window installation will try to convince you differently. In addition to distributing the financial burden, you are also dispersing the associated inconvenience. They are also correct in pointing out that if your windows are pretty old, it may be years before you see any difference in your home's energy efficiency.

With the high price tag associated with the window replacement process, it's no surprise that many homeowners want to spread it over time. When dividing up the cost and inconvenience, some start on the upper level and work their way down. Some individuals choose to replace only one window per year.

Getting written quotes is the best option. Never forget to compare apples to apples. Suppose you're getting quotations to replace wooden windows, ensure that the amount allotted for painting and decorating is included. Then you may haggle over the cost.

The Advantages Of Hiring FENSA-Registered Window Fitters

professional installing window

FENSA is the most popular competent person scheme in the UK. Any work performed by a FENSA-approved installer is subject to regular inspection to verify it meets current building codes. Only those who pass can present you with a FENSA certificate upon completion. A FENSA certificate is essential when it comes time to move, so make sure you request one.

A FENSA-approved installation must offer an insurance-backed guarantee (IBG) if you hire them to work on your home. If you have a future installation problem and your installer has gone out of business, an IBG will cover the problem's cost. It's similar to buying insurance for a warranty. Submit a claim to your IBG provider if an installation-related issue arises later on that would have been covered by the installer's warranty.

New Window Installation Process

worker measuring a window

Looking at the entire window replacement process, from the initial estimate to the final installation, can help set realistic expectations.

1.   Discover A Window Fitter Near You

Compare costs, quality of service, and expected turnaround time by requesting quotations from multiple window fitters.

2.   Arrange Visit To the Home

Facilitate a visit by a FENSA-approved window fitter you contacted for quotes to your house to assess your specific needs. It is the perfect place to discuss the aesthetics of your new window, including the materials, colors, and styles you're considering.

3.   Analyze Quote Contents

After completing everything, you will receive formal offers to choose a partner. Paying 10% to 20% is customary to allow the installer to secure your selected materials and reserve the time needed to complete the job.

4.   Fix the Time Of Installation

Get confirmation from window fitters to determine the completion time and when they start the window installation process. Keep a follow-up with your window fitters.

5. Get Your FENSA Certification After Making Payment

After the job completion to everyone's satisfaction, you can make payments and receive a FENSA certificate.

Use Easefix to find FENSA-approved window fitting contractors for new window installation today.

Frequently Asked Questions

1. Is a FENSA qualification essential?

Having a FENSA accreditation will reassure you that the installation quality of your new windows and doors is up to par with the industry standard. The following are guarantees made by the certificate:

  • Domestic window and door replacement are included.
  • You may rest assured that your setup follows all applicable codes.
  • Since the job was reported to the city, no inspection fees would be assessed.
  • Your setup is really efficient from an energy-saving standpoint.
  • In addition to being a crucial piece of paperwork when selling your house, it proves that the guarantee your installer provided is covered by insurance.

2. Does selling my house require a FENSA certificate?

If you're planning on selling your home, get a certificate of occupancy from your local building department verifying that your windows comply with local regulations.

CERTASS, FENSA, or another competent person scheme may issue such a certificate. Be sure to ask your contractor if the windows you plan to install as part of a home improvement project have been approved by your local authority's Building Control.

3. Does your window replacement process cover the inside or the outside?

Depending on the circumstance, your window fitter may choose to replace them from the inside or outside. To ensure as little interruption as possible is caused inside your house, your FENSA-licensed window fitter will complete as much installation as possible outside. However, if you want your windows to be installed correctly per building codes, you'll need to do some work inside your home.

4. If I want to replace my windows, how long will it take?

It shouldn't take more than an hour to put up new windows. However, the number of installers needed to complete the job, the size of your home, and the type of windows will all affect the final price.

Window fitters can install new windows in at least three or four rooms per day. If your windows are made of wood and need to be primed and painted, add more time to the new window installation process.