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Windows, Doors, Conservatory Roofs & More

D&I we have quality products for you to choose from. If you need a national trade supplier and fabricator, we’re happy to facilitate your purchase. We believe in reciprocity and creating strong relationships in our field. We work as a double glazing supplier in addition to our installation business, and we can offer you a wide range of products.

As a fabricator, we use profiles from large established companies with quality designs. We can make sure that you get the assembled product that you need in no time. When you’re looking for your next double glazing supplier, whether you need windows, doors or conservatory roofs, just give us a call.

Just get in contact with our team, and we can talk to you about our many products as a double glazing supplier.

Est. 2009

While we have worked with customers for over 20 years, we pride ourselves on working with the trade as a double glazing supplier. And our product lines make that easy. Our experience means that we know what you’re looking for and we can offer competitive prices for tradespeople across the country. Choose us for your next double glazing supplier so that you can get products that are easy to install.

Quality Fabricators

You’ll want to make sure that your products are in good hands. You can’t get better than with D&I. We’ve been fabricators for over 10 years, and we can say that we have the utmost confidence in our work. And as a double glazing supplier, we make sure to offer 10 year guarantees for you and the end user. That way, you can make sure that your client’s investment is insured.


We’re proud of our accreditations as double glazing suppliers. You can find us on both Which? Trusted Trader and the Federation of Master Builders, so you can be sure that our products and service as fabricators have been tested for quality control. As a supplier to trade, we want to ensure that you’re getting top quality products that are made to last. Give your clients quality.

Excellent Designs

All of our products are made with designs from leading market suppliers, including Deceuninck, Kommerling, VEKA, Sheerline, and more. We believe in offering you the best that we have to offer, as well as market standards. As a double glazing supplier, we know how important it can be to find brands they recognize. When ordering from us, you can offer them brand standards.

double glazing barnsley

Start Your Quote

You can use our quoting engine to help you get a sense of the specifications of our products, including sizes, ranges, and glazing. But when you contact us, you’ll be able to get a more accurate quote. See if we have what you’re looking for.

Garden Office Barnsley

uPVC Products

As a double glazing supplier, we have experience working with uPVC products. You can find our range of uPVC casement windows, flush casement, tilt & turn, and sliding sash. We also offer uPVC doors, like our composite doors, uPVC patio doors and uPVC French doors.

Ask us more about how we manufacture these weatherproof and incredibly thermally efficient window profiles. Most of our uPVC products are from several key manufacturers like Deceuninck, Kommerling, VEKA HALO, and Eurocell. And as a top notch double glazing supplier, we assemble their profiles at our Barnsley base before shipping them across the country.

Flush Casement Windows Barnsley

Aluminium Products

You need a double glazing supplier that can offer you superior products, like aluminium. You can choose this long lasting, thermally efficient product when you choose us. We offer aluminium tilt & turn windows, casement windows, bifold doors, entrance doors, and patio sliding doors.

As a superior double glazing supplier, we use Sheerline profiles for our aluminium windows and Deceuninck and Hallmark profiles for our aluminium doors.

Casement Window Prices Barnsley

Timber Windows

We appreciate being able to offer a great range of products as a nationwide double glazing supplier, including traditional timber windows for heritage homes. Because this is such a high end product, as a double glazing supplier, our timber windows are fully bespoke. When you contact us and let us know your specifications, we can give you a quote.

Conservatory Prices Barnsley

Conservatories, Orangeries, Garden Rooms

We assemble Supalite conservatory roofs and fabricate Eurocell, Sheerline & Kestral products for our orangeries. Our in house fabrication of garden rooms is unique in that it uses a screw system that does not include a foundation and can be moved if necessary. And as a smart double glazing supplier, we offer premium products like roof lanterns and flat skylights.

Double Glazed Doors in Barnsley

Garage Doors & Composite Decking

Look no further if you are looking for roll up, up and over, or sectional garage doors. Our garage door systems are from Garador, Alutech, Cobra, and Fort Doors. We can offer any number of timber, or insulated designs, including window panels.

If you are looking for trade supply, we supply several different manufacturer’s of composite decking, and we can speak more about them when you contact us.

French Doors Exterior South Yorkshire

Read Our Reviews


Wanted some composite doors and decided to go with this company excellent service from start to finish great job recommend

Michael Day - 27/09/23

Hi Just had a door fitted, great experience .no fuss, no mess and brilliant job by Daniel and Ritch. We would highly recommend .Many thanks D and I.

Dennis Laycock - 20/07/23

Very happy with their products and service. Apart from a very slight glitch on the order, this was very quickly sorted. Cannot thank Danny who did the fitting, he did a supurb job with real attention to detail. Both Dave & Ian I met and found them approachable and amenable and only to happy to ensure satisfaction all round. Would recommend anytime.

Morton C. - 15/11/22

I am very impressed with d&i windows. From start to finish they have been excellent. Kelly was very friendly when she came to quote, the surveyor was very friendly and knowledgeable and the fitter was very good too. After shopping around, both the wait time and price was the best in Barnsley. Really happy we chose them. Will definitely recommend

Laura Moody - 10/10/22

Had a large garden room built and decking area by D&I ...can honestly say David and Ian have been nothing but accommodating to our needs. Been absolutely fabulous with us in every way. Also a big Thankyou to the fitters Jason, Brandon, & Terry for weeks and weeks of hard work.

Terry Vaile - 01/09/21

Gave D&I a call after struggling to get a ramp done for my mother in law who has been diagnosed with motor neurone disease and hasn’t been able to leave the house for a year. They immediately got on with sorting it and it wasn’t an easy process but Dave never stopped planning it and came up with a solution, They had black composite decking with a ramp and it looks absolutely beautiful ,cannot thank you all enough for everything you’ve done an absolute brilliant service

Lucie Evans - 03/05/21

Anyone looking for new Conservatory with a light weight tiled roof look no further. These guys do a excellent job, so organised all the trades followed each other, even Covid 19 only caused slight delay D & I were back on the job as soon as safety allowed. I doubt you will get a better price anywhere else either.

Jillian Butler - 05/11/21

Would definitely recommend. Came round to offer quote quickly. No hard sell (didn't spend hours trying to wear me down like other companies). Fair and competitive price. Very helpful in organising a fairly fast turnaround to fit in with our other building work. Guys that came to fit windows did a really neat job, took care to put down dust sheets and also tidied up after themselves. Windows look great. Certificate arrived within a couple of weeks as promised. Thanks D&I!

Sue McGlone - 23/10/2017

Friendly, helpful and no pressure. Recommended.

Simon Gillard - 27/10/2020


Contact Form

When you contact us about our supply to trade, we can offer you more. Let us know that you’re looking for window or door supply when you give us a call. Wherever you are, we can offer you a trade price. Our wide array of products means that we have just about every window, door, or decking option you could ask for. Just let us know what you’re looking for.

Frequently Asked Questions

We try to answer all of your queries with our frequently asked questions. If you have more questions about our work as a double glazing supplier get in touch to let us know.

Who do I get in contact with?

You can always use our contact form so that one of our friendly Barnsley team can get back to you. Our business owners are Dave & Ian, and we appreciate making new connections in the business. We supply nationally so don’t worry about whether we can ship to you.

Does D&I install windows and doors?

Do you supply timber windows?

How do you install the garden rooms?

Latest News

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12 June 2024

Sliding Doors Vs Bifold Doors

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Get in Touch

Contact us when you’re looking for your next trade supplier. We supply to the trade in South Yorkshire, including Barnsley, Sheffield, Rotherham, Doncaster, Wakefield, Huddersfield & Leeds. Our friendly team can talk more about our trade supply and our product lines.

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Look through our downloads to get a better idea of sizes, configurations, U-values and more. You can always contact us for any further questions that you have. Our Barnsley team is happy to help.

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