Buyer’s Guide

Everything You Need to Know About Buying New Windows & Doors

It can be a mindfield out there. Despite a much more regulated industry these days, there are still companies out there that will use high pressure sales tactics and tricks such as “too good to miss” offers to get you to sign up. When you’re spending a lot of money improving your home, you want to be sure you are making the right choices.

Here we set the facts straight and present our quick guide on how to purchase your double glazing and the all important questions you should be asking your installer. (Psst, our Blog has a whole lot of useful articles too).

Be Aware of Dubious Sales Tactics

Certain salespeople will sometimes quote a higher price to begin with, which they will then discount over the course of their sales visit. The price you’re finally quoted could drop by as much a half or more in an attempt to get you to sign up there and then. From much of the feedback we receive, this seems to be a more common practice in big-name companies.

At Ruislip Windows we want to make the whole experience of buying your new windows and doors a pleasant one. That’s why we won’t engage in any high pressure sales tactics or dubious sales practices, just to get your job. We give honest, practical advice and a realistic quote without any “signing up” deadlines. And we give you plenty of time to think about it, too. When we visit your home to give you the quote, we won’t spend all evening there either. Usually 30-45 minutes is more than adequate.

Choosing Window Designs

Replacing windows on your property can change the visual appearance of your home considerably. You should choose a style that matches your property and enhances its looks. It’s a good idea to look at properties similar to yours in the area and compare the effect of various replacement window types. It is also a good idea to ensure that you have adequate numbers of opening windows. Fire escape hinges should always be fitted to casement bedroom windows.

Discuss the technological benefits of different window and door systems so that you can get a feel for how knowledgeable and professional the company seems.

Building Regulations

Self Certification: Competent Persons Schemes

New windows and doors installed in your property must comply with current building regulation and thermal performance standards. This can be achieved in two ways: by either requesting an inspection from your local authority to confirm the installation does meet the latest standards, or by using an installer who is enrolled in a self-certification scheme, such as Fensa or Certass. Installers can self-certify compliance under the Building Regulations without the need for a separate assessment from the local authority. Work carried out by a self-certified installer must:

Ruislip Windows are Fensa and Certass registered. Our installations are registered with either Fensa or Certass at completion, and our customers receive their certificates direct from them. Remember, you will need this certificate if you decide to sell your property at a later date.

Ruislip Windows offer insurance backed warranties from Quality Assured National Warranties on all our installed products.

You can find out more about QANW here.

Check the Guarantee Carefully

A guarantee is not worth the paper it’s written on if it’s not insurance-backed and the installer goes out of business. Installers who are registered members of a self certification scheme are legally obliged to have insurance policies in place. These are like an insolvency guarantee and only become effective if a company should go out of business.

If a registered business takes a deposit in advance of an installation, they must give some form of deposit indemnity. This could be a trade association deposit indemnity scheme, or credit card protection. A registered business must also give a guarantee or warranty covering the cost of completing rectification work in respect of defects and in the event of ceasing to trade and offer to back this guarantee with an independent insurance policy.

Customer Experience

Where practical, try to view other work carried out by the company and speak to previous customers. Try and ask specific questions such as, “Did they turn up on time?”, “Was anything missing and how quickly was this rectified?”, “Did they leave the site clean and tidy?”. Don’t always expect perfect answers!

No matter how good a company is, there can sometimes still be problems with an installation.
Any type of building work or remodelling can have its issues or unforeseen challenges. The important point is, how quickly was it sorted and was it to your satisfaction?

Doors

Rarely will the “cheapest” price be the best for you in the long run. When comparing “like with like” please also take into comparison how long the company has been established and the quality of their guarantees and fitting teams – a great product is useless if it’s poorly fitted.
You may find two suppliers using the same extrusion and glass type. However if one supplier happens to be some fitters doing private work at the weekends then bear in mind that their so called 10 Year Guarantee may be of less value than another from a more established company with a supporting infrastructure and a good aftersales service.

Conservatories

A WHICH? survey carried out in August 2016 found that small local independent companies scored higher overall than the big brand nationals. Altogether 2239 WHICH? members participated and rated big brand companies Anglian, Everest and Safestyle alongside small local installers. The small local installers outscored the big brands every time.
We would recommend you choose a local business in your area – someone you can visit face-to-face and build a relationship with. Local businesses are more conscious of the need to uphold their reputation and, if problems arise, are more likely to resolve the matter quickly,

What Our Customers Are Saying About Us

4.9
(215 Ratings)
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Doreen Conteh profile pictureDoreen Conteh
18:01 12 Dec 25
I had a porch fitted and changed a ,back door and a few windows. Really pleased with the quality of the work. Excellent professional service from surveyor and office staff as well.
Richard SoundVault profile pictureRichard SoundVault
17:10 05 Dec 25
Always great service. Friendly and on time.
Harriet Low profile pictureHarriet Low
17:38 28 Nov 25
We love our new window and backdoor! It has made such a difference to our home. We always use Ruislip Doors & Windows, & they have never let us down!
Dipesh Mistry profile pictureDipesh Mistry
09:49 21 Nov 25
Great service, would recommend.

The fitters Fernando and Casio were great. Did a great job cleaning up after a quick installation.
Poonam Shah profile picturePoonam Shah
13:17 12 Nov 25
We contacted Ruislip windows and doors to fix a broken window pane at our house. They provided a competitive quote and fixed the pane within a short space of time. They were courteous and provided an excellent level of service. We will be sure to use them when needed again and recommend them to everyone.
Paula Heasman profile picturePaula Heasman
12:05 08 Nov 25
Ruislip Windows replaced my windows throughout my house. They did a fab job and worked really hard each day, not even stopping for lunch. They protected my property from any mess and we're very polite. Would definitely recommend them. Very happy with my windows!
dinesh Chotai profile picturedinesh Chotai
16:04 06 Nov 25
I have not had a chance to visit the property however my tenants are impressed by low sound levels and warmth. I asked the tenants to send me the photos of the new windows are installed. I am very happy with the service we received when me and my daughter visited their showroom/offices in watford. The service was excellent from start to finish. I will definitely use the company again and will recommend to my friends and family.
neil mccabe profile pictureneil mccabe
12:42 06 Nov 25
Pleasure to do business with. Residence R9 windows are top quality and would thoroughly recommend supply and fit by Ruislip W&D's . Fitters were also very experienced, knowledgeable and calm...
Roni Kurian profile pictureRoni Kurian
22:52 03 Nov 25
Thank you so much Ruislip Windows and Doors limited for helping me with my windows..My old windows were in real bad condition and I phoned the company and they helped with the quote and Yakub and his colleague helped to fix the new windows with perfection.. Cleared all the waste stuff from my house and I like to thank John also for the help from start to end.. Keep up the good work
Vic Daltrey profile pictureVic Daltrey
18:34 28 Oct 25
We needed our landing window replaced and Ruislip Windows did a splendid job. The leaded lights were copied and look like the originals. The chap fitting it was polite and caring and left the sight all clean and tidy.
Altogether an impressive result.
Teresa Pedro profile pictureTeresa Pedro
12:41 23 Oct 25
Quick quote, competitively priced and lead time realistic. Extremely happy with the service despite wrong type installed initially but quickly and professionally rectified. John kept me informed and Tom and Mark carried out the work.Both were Cheerful and hardworking. I will certainly recommend this company.
James Winter profile pictureJames Winter
10:25 20 Oct 25
Very painless service. Work was carried out on time and with minimal disruption. The finish is superb and the windows look great. Thank you.
Alan Evans profile pictureAlan Evans
09:47 20 Oct 25
The two man team were wonderful fitting both windows and doors. We couldn’t have been happier with their work and also the way they were in the house. We felt they went above and beyond to make sure everything was right. I would absolutely recommend this company.
Steve profile pictureSteve
14:53 28 Mar 25
We contacted Ruislip Windows about replacing our porch and was pleased to find they could fit new front, side panels and trim and use the original roof and frame. The whole process from Mark visiting to discuss what needed doing to Rob and Ryan fitting the new parts was excellent, all old parts were removed same day and everything was kept clean and tidy. Rob's eye for the finishing details was second to none.
We have used Ruislip Windows before and would recommend them to anyone that asked.
Thank you to everyone we spoke to, we are well pleased with the final item.
Steve and Jenny Welsh
Peter Jones profile picturePeter Jones
15:20 06 Dec 24
The surveyor was very helpful when he came to measure up and advised us on the types of installations available and when we could expect the installation of our doors and windows.
We received a text, within the period advised by the surveyor, asking us when would be a convenient time for the installation.
On the day of the installation the first fitter arrived early in the morning and started removing the old windows and doors. Soon after a second van arrived with the replacement doors and windows and installation commenced. The men worked non stop and completed mid-afternoon. The surrounds of doors and windows were repaired where necessary. The old fittings were removed and all the rubbish swept up and cleared away.
We were shown how the locks and the internal blinds worked.
Overall we are very satisfied with the new doors and windows and the workmanship of the fitters. We would certainly recommend Ruislip Windows and Doors Ltd to anyone.

Our 39 Year Tried & Trusted Process

We’ve been fitting windows, doors, and conservatories for nearly four decades. Our proven process delivers outstanding results time after time, giving customers excellent installations on every project.

Book an Appointment

Schedule your appointment easily by email or phone. Our friendly team will confirm your details and arrange a convenient time for your free quote.

Free Quote

One of our experts will visit your home to measure up and discuss your options. You’ll then receive a clear, no-obligation quotation.

Confirm Date

Once you’re happy to go ahead, we’ll schedule your installation for a date that suits you best, keeping you informed every step of the way.

Job Complete

Our experienced fitters complete every job to the highest standard, leaving your home tidy and your new windows, doors, or conservatory ready to enjoy.