Premium Aluminium Systems
Advanced aluminium window systems that deliver modern performance with ultra-slim frames, opening like traditional casement windows whilst maximising natural light with their minimalist steel-look aesthetic.
Highly rated on:
Once your installation is complete, just sit back and relax. Enjoy the peace of mind that only a ten year insurance backed guarantee can offer.
As an accredited supplier of Origin’s market leading aluminium double glazing, we’re the first choice for Bristol and the surrounding area.
4.8 stars based on 440 reviews - our customers consistently praise our professional installation and exceptional service.
We provide completely free, no-obligation quotes with transparent pricing and no pressure sales tactics whatsoever.
Reynaers Slimline windows feature ultra-slim aluminium frames with a distinctive steel-look aesthetic that maximises glass area for abundant natural light. These premium systems offer numerous advantages for modern homeowners.
Exceptional insulation with U-values as low as 1.1 W/m²K when triple glazed, helping minimise heat loss and significantly reduce your energy bills.
Ultra-slim frames maximise glass area for more natural light intake, featuring unique steel-look aesthetics perfect for contemporary and traditional properties.
Premium aluminium construction resists warping, corrosion and wear, ensuring your windows remain attractive and functional for years with minimal upkeep.
SL68 system is Secured by Design accredited with advanced multi-point locking mechanisms, meeting stringent security standards for complete confidence.
A big thank you to Jason and his team for their fantastic work! We've been working together for quite some time now, and they've just...
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Ellie
Via Trustpilot
What a lovely team! Went out of their way to help, Very friendly and helpful indeed! Thank you to all at associated windows
Kane Trimnell
Via Google
Great company to work with, would highly recommend Rob and the team.
Adi D
Via Yell
Excellent quality and service, amazing Origin products. We would highly recommend.
Darren James
Via Trustpilot
We are extremely happy with our new windows and door from Associated Windows. The pricing and quote were clear with no hard sell. They managed...
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Janine Talbot
Via Google
Outstanding company with a straightforward, honest approach to pricing and customer service. The quote provided was fair and accurate—no inflated numbers followed by sudden discounts....
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Verified Reviewer
Via Checkatrade
A big thank you to Jason and his team for their fantastic work! We’ve been working together for quite some time now, and they’ve just completed the installation of triple glazed windows at our Cotswolds barn conversion. The windows look absolutely fabulous — the quality is outstanding, and the attention to detail has been excellent throughout.
The Origin triple glazed triple sliders in particular create a real wow effect and have completely transformed the space.
Looking forward to the next project together!
Ellie
Via Trustpilot
What a lovely team! Went out of their way to help, Very friendly and helpful indeed! Thank you to all at associated windows
Kane Trimnell
Via Google
Great company to work with, would highly recommend Rob and the team.
Adi D
Via Yell
Excellent quality and service, amazing Origin products. We would highly recommend.
Darren James
Via Trustpilot
We are extremely happy with our new windows and door from Associated Windows. The pricing and quote were clear with no hard sell. They managed to get the windows and door installed within our very tight time frame (our fault!) and the finished products are well made and look great. I definitely recommend them as a window/door company!
Janine Talbot
Via Google
Outstanding company with a straightforward, honest approach to pricing and customer service. The quote provided was fair and accurate—no inflated numbers followed by sudden discounts. We received expert advice during the window measurement and ordering process, which was handled professionally. Installation was fast, clean, and high-quality. We’ve used this company twice over the past 15 years, and both times they delivered the best combination of price and workmanship.
Verified Reviewer
Via Checkatrade
We’re Bristol’s go-to experts for premium aluminium windows, supplying and fitting Reynaers’ entire range. As a Which? Trusted Trader, we offer complete price transparency with up to twenty-year guarantees, delivering high-quality installations that look absolutely stunning.
Reynaers Slimline SL38 and SL68 windows provide a host of benefits for homeowners seeking style, performance, and practicality in their window solutions. These advanced aluminium systems combine modern performance with elegant aesthetics.
Both systems are excellent for properties seeking to maximise natural light and modernise aesthetics while meeting high-performance standards in thermal insulation, weather resistance, and security.
With options for double or triple glazing, a range of frame styles including Classic, Ferro, and Cubic, plus various colour choices, our SL38 and SL68 systems offer complete flexibility.
Here are answers to the most frequently asked questions about Reynaers Slimline SL38 and SL68 windows to help you make an informed decision.
Contact UsSL38 offers slender sightlines with U-values to 1.4 W/m²K, whilst SL68 provides enhanced security and superior thermal performance to 1.1 W/m²K.
Yes, the steel-look aesthetic makes them ideal for refurbishing traditional steel-framed windows whilst delivering modern performance and energy efficiency.
The SL68 system is Secured by Design accredited with multi-point locking systems, whilst both systems meet stringent security standards throughout.
Extremely efficient - SL38 achieves U-values as low as 1.4 W/m²K, whilst SL68 reaches 1.1 W/m²K with triple glazing.
If you would like to leave us a message at any point during the day, even during closed hours, please fill out our online contact form, or click below to start your free quote. We will get back to you as soon as possible with everything you need to know about our Aluminium Windows.
We look forward to hearing from you soon!
