D Simpson Windows and Doors – Ayrshire & Renfrewshires reliable home improvement specialist’s

Proudly providing expert installations across the Garnock Valley and surrounding areas

Superior craftsmanship for your home at competitive prices

We are your trusted, friendly, and local team of window and door specialists, serving both residential and commercial sectors in the Garnock Valley area.

With over 40 years of combined experience in the window and door trade, we take pride in offering the highest quality products along with exceptional service.

Over 40 Years of Experience

With over 40 years of combined experience, our team has extensive expertise in installing high-quality windows and doors.

Superior Quality Service

We guarantee exceptional service and top-quality products. Every installation is handled with care and precision, offering you the best value in the industry.

Competitive prices

We provide high-quality products at competitive prices, ensuring that you get the best installation for the best value, every time.

Professional aftercare

As a trusted local company, we are always in the area and just a phone call away to swiftly resolve any small issues that may arise.

10 years insurance backed guarantee

We can protect your investment with an insurance-backed guarantee. Rest assured, if the unexpected occurs, we've got you covered.

Windows

Doors

Roofline

Repairs

Gallery

About us

LOCAL, TRUSTED, WINDOW AND DOOR EXPERTS

As window and door specialists, D. Simpson Windows & Doors are committed to providing outstanding customer service, expert installations, competitive prices, high-quality products, and complimentary aftercare.

If you reside in the Garnock valley or surrounding areas and seek professional installation of top-quality windows and doors, we’re the ideal choice.

D Simpson Windows and Doors LTD

5.0

Based on 54 reviews

review us on

pauline dunning

05:56 29 Aug 25

Never have I had a team of workmen do a job to a PERFECT spec.. All windows and doors fitted to the highest standard. When returning home after leaving them to it you would never have known they had been in the house apart from new windows. There was nothing at all for me to clean up. From first contact to final payment its been a breeze. If you have to wait till they fit you in then wait, its so worth it. These guys were a credit to the company. To say I'm more than happy is such an understatement. Ive only got a pic of the back of the house.

Phoebe Wark

21:28 28 Aug 25

Brilliant…..great job no mess defo recommend👍🏻

Allan McGinlay

17:08 26 Aug 25

Highly recommended – what an amazing job, from a great bunch of people. Right from initial contact, onsite visits to establish what was required, and the actual installation, we have been greatly impressed by the professionalism and workmanship of this business. We recently had all the windows and doors in our house replaced, 11 in total, which included, bay window, 3 sets of French doors and the front door. As you can imagine this seemed like a very daunting task, especially with the complexity of a couple of them, however right from our very first visit from Dave, he was able to put our mind as ease ( although I do think it gave him a headache or two ). Over the two days of installation, the guys hardly stopped, only to eat the sausage or bacon rolls my wife hade made them. They covered all furnishings during the install and constantly cleaned up as they went, even had their own Henry hoover – you would never know they had been working there. Their finishings were excellent, we had existing wood finishing inside, which we were able to keep and they worked around these – it did make their work a bit more difficult, but they were able to overcome this. I honestly can’t praise them enough. They were recommended to me by one of my friends who had work done, and he is of the same opinion. I would have absolutely no hesitation to recommend them.

Maureen smith

15:07 15 Aug 25

Would definitely recommend. Reliable company which I have used twice and they did an excellent job on both occasions fitting both doors and window.

Anne Niven

14:32 31 Jul 25

We are delighted with the patio doors, windows & composite front door all installed by David’s team. I wouldn’t hesitate to recommend to others.
Thanks again !

Shannon Smith

14:45 25 Jul 25

Highly recommend David and his team for windows and doors. Absolutely amazing customer service from start to finish. We’re over the moon with the end result and so glad we chose David Simpson to supply and fit our windows and doors. They are amazing at what they do and they leave no mess behind either. Great effort, thanks again🤩

Jim Atkinson

13:06 17 Jul 25

David and the team were impressive in their skill, professionalism and courtesy. The old windows were removed with great care not to damage adjacent tiles or sills and the new ones of excellent quality were installed with precision. The team was careful to protect floors, surfaces and furniture with dust sheets and they cleaned up leaving no mess. The standard of finishing is excellent. The same is true of the new front door unit which they fitted.
Units were delivered with incorrect handles. These and a few other snags were remedied rapidly without fuss.

Linda Naz

06:19 03 Jul 25

David and his team are first class.Very professional ,polite and tidy .Have already recommended them to many friends

Laura Wotherspoon

19:42 02 Jul 25

Absolutely delighted with our new windows and doors. From our 1st appointment right through to getting fitted, communication was great, service was fantastic, extremely tidy throughout fitting, very friendly fitters, and competitive pricing. Wouldn’t hesitate to recommend to others. Thanks again

Eleanor Shearon

19:11 02 Jul 25

Fantastic windows! David and his team replaced our old sash and case windows for new UPVc ones.
From start to finish the job was professional and ran like clockwork. I have had David back several times now to replace old windows, everytime the same exceptional level of service.

5

Based on 3 reviews

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

John DoeCEO

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

John DoeCEO

Lorem ipsum dolor sit amet, consectetur adipiscing elit. Ut elit tellus, luctus nec ullamcorper mattis, pulvinar dapibus leo.

John DoeCEO

Testimonial to be supplied

Proudly providing expert installations across the Garnock Valley and surrounding areas

Superior craftsmanship for your home at competitive prices

Over 40 Years of Experience

Superior Quality Service

Competitive prices

Professional aftercare

10 years insurance backed guarantee

Windows

Doors

Roofline

Repairs

Gallery

About us

LOCAL, TRUSTED, WINDOW AND DOOR EXPERTS

5

Request a Quote Today

Our suppliers brochures