Choosing a window supplier is a big decision. It’s probably one of the biggest investments you’ll make in a while, and the consequences of getting it wrong could stay with you for years. So we’ve put together some key questions for you to check:
1. Do you trust the Installer?
This sounds like a stupid question, but they will have access to your house whilst you’re not there, and potentially access to your valuables. So make sure you trust the people you’re going to let work on your house.
2. Is the cheapest price really what you want?
Many people opt for the cheapest option. However, it’s impossible to do a job cheaper than any other supplier without cutting quality or service. So if you do go for the cheapest quote, make sure you understand the pressures the supplier is putting themselves under. In particular, very cheap suppliers don’t usually stay in business long, and when they’ve disappeared, who’ll service your windows for you?
3. Do you know someone who’s had a good job done by them?
This is a key question – working off a recommendation from a friend or neighbour has several advantages. Firstly you can usually examine the work which has been done calmly in your own time. Secondly, someone you know and trust has already taken a risk with them, and it worked out well. And they also know that if you’ve been recommended by someone, and if they do a good job, they could end up with further recommends either from you or your friend.Don’t forget to check the specification and results for yourself. Your friends might be pleased with a friendly company even if they fit inferior products so still ask all the questions and compare other companies even if you do get a recommendation from a friend.
4 Is Your Supplier Registered with a Trade Scheme?
It is very important to check that whoever installs your windows is registered with a trade scheme. For example, in the UK this is FENSA. All windows have to comply with building regulations and FENSA registered installers have their work checked to make sure that it does comply. Every professional window installer in the UK is a member of FENSA. This means that they register your window installation with your local authority. All FENSA members are assessed regularly and their accreditation will be withdrawn if they are not up to scratch. In addition, every FENSA installation has to have a 5-10 year insurance-backed guarantee, which means that if your supplier goes out of business, your guarantee is still valid. In your country, there may be a similar trade association.
5 Is all rubbish to be removed by the supplier, and are skips/dumpsters included?
This sounds like a daft question, but make sure that your supplier has agreed to remove all old windows from site and dispose of them. Otherwise you might end up with an extra bill and a lot of work to clear the site!
6 Will the site be left safe overnight?
Make sure that the supplier can explain to you what precautions they take to leave your house safe from intruders, and to keep the residents safe from tools and debris. This is particularly important if you have small children.
7. Is Planning permission/consent or a Permit Required?
For many replacement window jobs no planning or permit is required, but if you live in a listed building, conservation area, national park or other building with restricted development rights you may be limited on your options. In addition, if you’re extending the property, seek professional advice. In any case your supplier should be able to advise you and even manage the process for you.
8. What is the payment schedule?
Before you sign any contract, make sure that you understand what is due to be paid when. Typically an effective plan is to agree an up-front deposit, a payment on completion and a small retention fee when all snags have been ironed out.
9. Is Your supplier’s Finance Scheme really the best deal?
If you decide to take out finance to pay for the new windows, make sure that you’re sure you understand what it will cost you. Many suppliers sell finance and receive commission for it, and in some cases you may be able to pay far less simply by taking out a bank loan or other alternative.All finance schemes must provide an APR (annualised percentage rate), which allows you to compare how much the finance will cost you easily.
10. What aftercare does the supplier offer?
Before you sign, make sure that you understand if the supplier proposes to make any follow up visits after the installation. It could be really annoying if problems develop the first time it rains after your new installation and you discover that your supplier doesn’t want to know!
11. What treatment/servicing is required?
After installation, make sure you understand how to clean the frames and what treatment if any is required. With timber in particular make sure you have a specification for the recommended treatment, frequency and its colour.
12 Checking your Window Order
It is important when reviewing your window order that you check each frame to make sure that the following are correct:
1). Colours (internal and external) 2). The location of the frame (e.g. Master Bedroom) 3). The openers and hinge positions 4). The size of the openers and fixed panels 5). In particular make sure that you can safely reach all handles 6). Where relevant, check that you can escape in the event of a fire 7). Any obscure glazing required

The direction of opening (particularly for doors). 9) The height of any door Thresholds.
Hopefully, asking these questions will help you make a good decision when choosing your supplier. Good luck with your project!
By: Dave Blakeman About the Author:
Dave Blakeman is the founder of RPS Limited, the developers of
RoofWright, the World’s favourite conservatory and window sales software. For a FREE copy of FrameWright, a cut-down version of our professional window sales software, simply visit
http://www.roofwright.com/framewright