A1 Windows and Doors

Serving Mississauga, Milton, Oakville and surrounding areas with the best windows and door repair, replacement and installations. Residential and commercial, we service them all. Call for a quote.

a1 windows n doors logo

We specialize in any and all replacement for your windows and doors. We are known for doing great work, every time!

Whatever your need, whether it’s commercial, at home, doors or windows, we can help! We only hire the most skilled engineers who all have years of experience and have access to the best tools in the business. There’s a reason our customers say we’re the best!

David Walasinski

I’m very happy with this local company they were so professional and work they did was absolutely amazing. The crew was so good and clean I would love to recommend them to everyone.

Shavonne Byrd

They provide the best service, fast, professional and efficient. Very easy to communicate with and friendly, great customer service. The installation crew provides safe, fast and non-messy services. I am very satisfied with it and will definitely recommend them to all my clients and friends! Great job!!!

Kendall Silverstein

Great experience coordinating my window purchase/contract. I highly recommend this company, not only do they offer great prices, customer service including contractors that came to install my windows were top notch.

Tom Dziza

A1 just installed all new windows in the second floor of our home. It took only 2 days and the team was professional, clean and precise. The work is excellent, fairly priced and they are a pleasure to work with. I highly recommend A1 Windows.

A1 Windows ‘n’ Doors
Installation & Replacement

Mississauga, Milton and Oakville are our home towns. We have years of experience here and know the neighborhoods like the back of our palm.

Your typical window and door companies don’t care about their customers and just want to get the job done fast. That is not us! Customer service is at the heart of our business, we just love leaving you with a smile on your face so you tell all your friends.

The first price you get is the only price. We believe in no nasty surprises!

Mississauga, Milton and Oakville are full of great businesses.

All of those businesses know the importance of giving a good first impression, which starts with windows ‘n’ doors!

We always aim for a fast turnaround and always work to the highest standards of quality. Even a simple crack in your window gives a bad, bad impression and so we always fix problems like that FAST!

When you have a problem with your windows or your doors, A1 is on your side!

Because of this we provide all of our valued customers with a complete warranty policy that you can trust for all of our work and parts. We repair and service parts to last so we back our engineers work 100%, but if something does go wrong then you’re covered!

Any questions?

We are always available to talk. For a free consultation, call now!

Any time of day, any day of the week, we are here to help. Problems pop up all the time, give us a call to find out how quickly we can help!

Frequently Asked Questions

We don’t recommend it! Specialist equipment is usually needed and a lack of experience can cause further damage.

Sure! We offer: Window Repair, Window Replacement, Screen Door Repair, Commercial Window Repair, Commercial Window Replacement.

This can vary a lot depending on the job. We can give you an estimate though, just give us a call to find out!

For the average house we try to get it done on the same day. Any longer and we’ll let you know before we start.

We sure can. We just love helping our customers!

Before we install any products, we always check it for quality. We also check over our suppliers to make sure they are always giving us their best!

Our customers' happiness is most important to us!

Your happiness will always be most important to us and we can even go further than windows and doors! We always want our customers to be as happy as possible so that you tell your friends.

We have years of experience and one thing stands out. Basic maintenance tasks on windows ‘n’ doors are left far too long. This leads to more damage and an even greater repair bill.

It is so important to keep your entrances and exits safe and secure. Please give us a call and we can check your home is as safe as you and your family deserve.

Here are some recommendations from our engineers.

A1 Windows ‘n’ Doors Repairs:
Judging the damage

Since windows are glass they are likely to get damaged, especially if you’ve got children playing! The good news is they don’t always have to be replaced. Most of the time we are able to installation windows. This depends on how much damage has been done.

Here at A1 Windows ‘n’ Doors Installations we offer a range of services including replacement and also repairs. We serve the whole of Mississauga, Milton and Oakville! Why wait? Give us a call now! We will help you understand and assess the severity of the damage your windows have.

Before making any decisions, it’s important to assess the damage. To help, we have prepared a list of things you should do to assess the condition.

Number of panes

If your window has a single pane then it is best to have it replaced, even if there is no damage.

Double or triple pane windows are more efficient and reduce your heat loss by half – saving those monthly bills!

If your single pane window is showing its age the why not get it replaced?

The window glass

If the glass is damaged or is moisture has worked its way in, then the first thing you should do is call your window manufacturer! They might have replacement panes reserved for you!

The material

If your windows are vinyl then they probably will last for a long, long time. Usually around 20 years!

Air leaks

Check to see if your windows are letting air leak in around them. The best way to do this is with a small flame like a match or candle. If the candle stays lit and doesn’t flicker badly then you probably don’t need to have them replaced! But, if there is a bit of flickering then a simple repair with some new stripping and caulk will make a big difference.


Do your windows open and close smoothly? If not then there may be some faulty parts that can easily be replaced. However, if there is heavy damage to lots of parts then the whole frame or sash might need replacing. In that case, it’s best to replace the whole thing.


If there is excess condensation on the inside of your window then there may be damage. If the condensation is between panes then a seal is broken. It’s best to check your warranty but if it’s out of date then we can fix you a new set!

Broken window

Sometimes accidents happen. If the window has shattered then a replacement is necessary and it is probably worth investigating how it happened!

Identifying the cause

Do you think it might have been an attempted break-in? If you do, call the police now. This can also help your insurance.

If it was an accident or due to nature then an insurance claim might be the way to go. Your homeowner’s insurance should be able to advise you if you have good evidence for a claim.

Clean up time

Are there shards of glass around? Better clean those up so that any children or pets don’t get hurt! Always make sure you’re wearing thick gloves so you don’t cut yourself and use a broom for the smaller pieces.

Secure that window

Leaving a broken window can leave your house exposed to nature or burglars. The best thing to do is to cover the window with plastic sheets, wood, or any material you have available. This will keep any rain and cold out of your house for now. Depending where you live, if security is a problem then you should use 2×4 pieces of wood to board up the window.

Give us a call!

A1 Windows ‘n’ Doors are able to installation and replace in Mississauga, Milton and Oakville.

We always offer a professional service and only use the best parts. If you need a trustworthy company then get in touch now.

We offer quotations based on the work you need and this won’t change. No nasty surprises!