Window Replacement Process: What to Expect & How to Prepare

Quick answer

The window replacement process usually includes an initial survey, choosing your new window style and material, preparing the area, removing old frames, installing the new units, completing final checks and providing aftercare. Most homes can be completed in one to three days depending on the property and number of windows.

Key takeaways

1. A full site survey ensures accurate measurements, identifies any repairs and prevents issues during installation.
2. Choosing the right window style, material and glazing helps match performance, appearance and budget.
3. Preparing the area by clearing access and protecting surfaces keeps the installation smooth and tidy.
4. Old windows are removed carefully and the openings are cleaned and checked before fitting new frames.
5. New windows are aligned, secured, insulated and sealed, then fully tested for smooth operation.
6. Installers clean the area, remove waste and provide a final walkthrough so you understand your new windows.
7. Aftercare includes warranties, guarantees and support for any snagging after the work is completed.

Table of contents

• Step 1: Site survey
• Step 2: Choosing your windows
• Step 3: Preparing the area
• Step 4: Removing old windows
• Step 5: Installing your new windows
• Step 6: Finishing touches
• Step 7: Aftercare
• Get a quote

Getting your windows replaced might seem daunting, but it doesn’t have to be

What to expect during a window replacement

Whether you are upgrading your home for better energy efficiency, improving security or simply refreshing the look of your property, knowing what to expect during a window replacement can make the whole experience much easier. This guide explains each stage of the installation process, how to prepare and what a professional installer should provide before, during and after the work is completed.

Step 1: Site survey

Why the survey matters

Your installation begins with a full site survey carried out by your chosen window company. This allows the installer to measure your existing frames accurately, assess the condition of the surrounding walls and ensure all access points are safe. A proper survey also helps avoid unexpected issues during installation, ensures your new windows fit perfectly and allows the installer to identify any repair work that may be required before fitting.
Preparation tip: Move any furniture that blocks access to your windows so measurements can be taken quickly and safely.

Step 2: Choosing your windows

Selecting styles, materials and glazing

Once your survey is complete, you can choose the style and specification of your new windows. This is where you decide the material, colour, glazing type and any additional features that suit your property. Aluminium and uPVC remain the most popular window choices for UK homeowners due to their durability, energy performance and low maintenance.

At Aluglaze, our consultative approach helps you compare the benefits of each material and select the perfect option for your home and budget. If you are unsure where to start, our guide on uPVC vs aluminium is a helpful introduction.
Preparation tip: Make a shortlist of the styles and colours you like so your installer can guide you more effectively.

Step 3: Preparing the area

Keeping your home clean and protected

Before installation begins, your installer will protect surrounding areas with dust sheets. This helps keep your floors, carpets and furniture clean during the removal and fitting process. A good installer will move carefully around your home, ensuring minimal disruption and maintaining a tidy work environment throughout the project.
Preparation tip: Clear window sills and nearby surfaces so the team can begin work without delay.

Step 4: Removing old windows

Safe removal of existing frames

The next stage is removing your existing windows. Installers will take out old frames, fixings, trims and sealant with care to avoid damage to the surrounding structure. Once the old units are removed, the opening is cleaned and checked to ensure it is level and ready for the new frame. If minor repairs are required, these are usually handled on the day.
Preparation tip: Take down blinds, curtains or shutters beforehand to keep them safe and avoid accidental damage.

Step 5: Installing your new windows

How new windows are fitted

This is where your home begins to transform. Your new frames are positioned in the opening and carefully aligned before being secured in place with appropriate fixings. Installers then apply insulation foam around the frame to improve thermal performance and finish with high quality sealant to prevent draughts and water ingress.

Once the frame is secure, the sashes are installed along with all hardware including hinges, handles and locks. Each window is then tested to confirm that it opens, closes and locks smoothly.

Step 6: Finishing touches

Final checks and handover

After installation, any protective coverings are removed and your new windows are cleaned and inspected. A professional installer will also remove all waste and take away your old windows. You will receive a walkthrough of your new window system, ensuring you know how everything works and are happy with the final result.

At Aluglaze, we also take installation photos for our records and provide digital confirmation of completion once you are satisfied.

Step 7: Aftercare

Warranties and support after installation

High quality aftercare is an essential part of the window replacement process. At Aluglaze, every installation comes with a ten year warranty on supply and workmanship, plus five years for hardware and glass. You will also benefit from strong manufacturer guarantees. For example, Smart aluminium windows include a twenty year paint and profile guarantee for long term peace of mind.

If any snagging issues arise after installation, our team will return promptly to resolve them. You will also receive all warranty documents and contact details at the end of your installation.

Get a quote today

Ready to start your project

AluGlaze makes the window replacement process simple, stress free and fully tailored to your home. Whether you are looking for new aluminium windows or uPVC windows in West Yorkshire or further afield, our team is here to help.

Call us on 0113 519 5507 to request a consultation and get your project started.