Windows

Advanced range of uPVC and aluminium replacement windows

Replacing your windows transforms your home’s energy performance while enhancing its appearance and value. Our carefully selected range of uPVC and aluminium windows combines modern thermal efficiency with designs that complement any property style, from contemporary builds to period homes.

Premium Products and Performance

We install replacement windows exclusively from established manufacturers including Rehau, Kömmerling, Aluk, ECOSlide, The Residence Collection, Origin Global and Smarts. Each product line offers proven performance backed by comprehensive guarantees, giving you confidence in your investment.
Modern window systems now come in an extensive range of colours and authentic smooth and woodgrain effect foils, allowing you to match existing features or create a fresh look for your property. The Rehau Rio Flush and Residence Collection recreates the character of timber windows using advanced composite and uPVC materials that require minimal maintenance.
Most of our window ranges achieve A-rated energy efficiency or better, helping to reduce your heating costs whilst improving comfort throughout the year. These high-performance specifications meet current building regulations and support your home’s overall thermal performance.

Maintaining Period Property Character

The development of modern window systems has made it significantly easier to preserve the distinctive features of period properties. Victorian cottages, Georgian terraces and Edwardian homes can now benefit from thermally efficient replacement windows that closely match original designs.

Contemporary manufacturing techniques allow for slim sightlines, authentic glazing bars and period-appropriate hardware that maintain your property’s character. Where planning restrictions apply or you wish to preserve specific architectural details, we can specify windows that meet conservation area requirements whilst delivering modern performance standards.

Browse our complete window range to see how the right choice can enhance your property’s appearance whilst improving comfort and reducing energy costs.

Our Windows

Our replacement window collection covers every architectural style and performance requirement. Choose from traditional casement windows, elegant sliding sash designs, versatile tilt and turn options, or our flush casement ranges that recreate the refined appearance of timber joinery.

We’ll help you select the appropriate glazing specification, hardware finishes and colour options to meet your exact requirements. Our team can explain the differences between uPVC and aluminium framing and discuss how various design features affect both appearance and functionality.

uPVC Casement Windows

Our standard uPVC windows are the highly regarded chamfered and sculptured range by industry leader Rehau. Smart looking energy efficient windows that benefit from a top specification:

  • 70mm frame depth.
  • Minimum A rated WER for optimal thermal efficiency.
  • Steel reinforced profiles.
  • Slim sightlines with a lowline grey gasket.
  • Chamfered or ovolo glazing beads.
  • Wide range of woodgrain foils and coloured finishes.
  • High security multi-point locking and shoot bolts.
  • Internal beading for enhanced security.
  • High impact, colourfast and lead-free uPVC profiles that are better for the environment.

Box Sash Windows

Our EcoSlide uPVC sash window is an environmentally friendly and thermally efficient high security window that mimics the charm of a classic timber box sash. All the benefits of a modern uPVC system coupled with an authentic looking, cost-effective low maintenance solution for your home.

  • uPVC box sashes that look like traditional wood.
  • Attention to detail – sash horns, external Georgian bars and traditional styled hardware.
  • Inward opening tilt facility allows easy cleaning of the outside frame and glass from inside.
  • Arched and swept head style available.
  • 8 coloured finishes as standard or have your windows sprayed to any RAL colour.

Aluminium Windows

We install the renowned ALUK casement windows as our standard aluminium window. With superior strength and slim sightlines our aluminium windows are available in a wide choice of colours, including dual colours.

Fully weather stripped to achieve the highest levels of weather performance and all profiles incorporate polyamide thermal barriers to meet the latest requirements for U values and window energy ratings.

  • Virtually maintenance free.
  • Wide choice of colour options including dual colour and RAL colours.
  • Security designed into system and hardware options.
  • Wide range of framing shapes to suit all styles of homes.
  • Able to meet many design styles that uPVC windows cannot.

Residence Collection

The Residence Collection is our luxury premium window system designed to replicate the flush timber casement window. Replace your windows with an authentic design and in heritage colours, without losing the character, appearance or feel of the period.

  • Can be considered for Conservation Areas due to its authentic appearance.
  • Virtually maintenance free, no more painting or staining.
  • Working or dummy butt hinges.
  • Traditional handles and peg stays.
  • 45º welds to replicate traditional timber.
  • Ovolo putty external Georgian bars.
  • Unbeatable performance accommodating the most thermally and acoustically efficient 44mm triple glazing and 28mm double glazing.

Flush Casements

Flush casement windows look great in any surrounding, from modern townhouse to country cottage. Flush external contours are in keeping with period properties and also meet the requirements of most conservation area officers. They will retain their elegance while still functioning as a high quality window for many years to come.

  • Sleek slimline frames.
  • Traditional style dummy peg stay option.
  • Mechanical or welded transom/mullion joints.
  • Traditional ironmongery and Georgian bar options.
  • High energy rating, weather performance and PAS 24 approved.
  • Double or triple glazing options available.
  • Available in a range of Heritage woodgrain finishes.
  • Super efficient rated A (at least).

Alitherm Heritage

Inspired by the aesthetics of traditional steel windows, Alitherm Heritage features signature slim sightlines and attractive contours making it the ideal choice for building conservation areas where building regulations demand a like-for-like replacement.

  • Internal or external installation
  • High quality powder coated paint finish in a choice of finishes, including single or dual colour, in a range of standard and non-standard colours
  • Perfect for both contemporary and period properties
  • Designed as a series of horizontal modules that can be stacked to form a multi-part window or door combination
  • Polyamide thermal break provides enhanced thermal performance
  • Energy Rating A achievable

Choosing your new windows

Replacing your windows can change the visual appearance of your home considerably. Long gone are the days when it was commonplace to rip out original windows and replace them with designs that were totally without keeping with the character and feel of the property.

Now, with all the latest Building Regulations and Conservation Area Guidelines we would think much more carefully about our choice of window, taking into account not only the aesthetics of the product in relation to the property but the environmental factors too.

With almost 4 decades of experience within the industry and an enviable in-depth technical knowledge, we are always happy to offer advice on your choice of windows, taking into account style, design and of course the all important budget.

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.

Brochures and Further Information

For more information about the installation process from start to finish, we recommend reading our Buyer’s Guide and our FAQs page to get you started.

See our Brochures and Videos page for our full selection of brochures on our complete window range.

Please feel free to contact us at any time to discuss your requirements in more detail and to arrange your free no obligation quotation.

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.