Christmas Opening Hours
Mon 22nd December: 9 – 5 usual hours
Tue 23rd December: 9- 5 usual hours
Wed 24th December – closed
Thurs 25th December – closed
Friday 26th December – closed
Saturday 27th December – closed
Sunday 28th December – closed
Mon 29th December – closed
Tue 30th December – closed
Wed 31st December – closed
Thursday 1st January – closed
Friday 2nd January: 9 – 5 usual hours
Classic Aluminium Windows – Where Slim Design Meets Superior Performance
Aluminium Windows for Homes Across Colchester, Essex & Suffolk
At Energy Efficient Homes, we install high-performance aluminium windows for homeowners in Colchester, Chelmsford, Ipswich, Braintree, Sudbury, Clacton-on-Sea, and surrounding areas. With over 100 years of combined industry experience, our team ensures expert installations, delivering ultra-slim sightlines, thermal efficiency, and robust security.
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About Classic Aluminium Windows
Learn more about the features and benefits of our high-performance Classic aluminium windows, designed for both modern and heritage properties. With ultra-slim sightlines, advanced thermal insulation, and built-in security, these windows combine aesthetic appeal with outstanding performance.
Ultra-Slim Sightlines
Maximise natural light with sleek 59mm sightlines, creating a refined, open interior with a modern architectural finish.
Thermal Efficiency
Our Thermlock® multi-chamber insulation provides exceptional energy performance, keeping your home warm and reducing heat loss.
Advanced Security
PAS24-certified with the option for Secured by Design accreditation, offering peace of mind with reinforced security features.
Durable & Weatherproof
Designed for the UK climate, our aluminium windows resist warping, corrosion, and extreme weather conditions.
Testimonials
Absolutely exceptional customer service, installation service and extremely prompt at answering any questions I had! Anyone in the south east or east of England looking...
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Josh
Via Trusted Trader
Really pleased with our new door, great value and great service throughout. Thank you Sean and team?
Becky
Via Trusted Trader
A great service from start to finish. Friendly knowledgeable colleagues and very helpful. They did a great job and cleared up after themselves. Very happy...
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Michelle
Via Trusted Trader
Absolutely delighted with the whole process from initial enquiry to the installation 10 out of 10, amazing company and very quick turnaround. Thank you so...
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Sarah O'Donnell
Via Trusted Trader
This is the second time we have used 1st Homes. This time we had a new composite front door and Bi-fold doors. Excellent company, value...
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Denis
Via Trusted Trader
Outstanding. A 1st class customer journey from start to finish. I would highly recommend this company for your project.
Mr Oza
Via Trusted Trader
- Colours
- Foils
- Styles
Colours
Aluminium Window Colour Options
Choose from 12 durable, powder-coated colours to complement your home. Our hard-wearing finishes provide long-lasting style and protection. Please note that digital displays and manufacturing processes may cause slight variations in colour. Use colour references as a guide only.
Get in touch to discuss your colour options.
Pure White RAL 9010 Matt
Hipca Gloss White RAL 9910 Gloss
Anthracite Grey RAL 7016 Matt
Jet Black RAL 9005 Matt
Cream RAL 9001 Matt
Agate Grey RAL 7038 Matt
Squirrel Grey RAL 7000 Matt
Pastel Turquoise RAL 6034 Matt
Chocolate Brown RAL 8017 Matt
Silver Metallic Effect
Mid Bronze Metallic Effect
Black Metallic Effect
Foils
Woodgrain Foil Finishes for Aluminium Windows
Choose from seven standard woodgrain foil finishes for a classic timber look with the durability of aluminium. These high-quality foils add warmth and character to any home. Please note that digital displays may not reflect the exact colour.
Speak to us about your woodgrain finish options.
Anthracite Grey 7016 MX
Black Brown Mx
White PX
Chartwell Green MX
Irish Oak MX
Golden Oak MX
Black Cherry MX
Styles
Classic and Modern Aluminium Window Styles
Choose from traditional or contemporary aluminium window designs, all crafted for seamless integration. Sheerline windows from offer a uniform look with matching styles, colours, and performance—perfect for a consistent finish across your home.
Find your perfect window style today.
Classic
Enjoy more natural light and a refined architectural finish with our ultra-slim Classic aluminium windows. With sleek 59mm sightlines, they maximise brightness while maintaining a beautifully balanced design. Unlike lesser aluminium systems, we’ve eliminated corner misalignment using our patented construction method. Each window is hand-tuned to perfection, offering a seamless blend of understated elegance and exacting quality standards.
Featuring Unique Thermlock® Technology
Beneath the clean, crisp lines of our aluminium windows lies the innovative Thermlock® multi-chamber thermal design. This advanced system helps keep your home warm and comfortable, shielding you from the harshest UK weather.
The built-in insulating chambers act as a thermal break, working seamlessly with high-performance glazing to deliver exceptional energy efficiency. Far superior to traditional polyamide thermal breaks, Thermlock® technology ensures your home stays cosy in winter and cool in summer—without compromising on style.
Built-In Security for Peace of Mind
Your home should feel safe and secure, which is why Sheerline aluminium windows from Energy Efficient Homes meet PAS24:2016 security standards as standard. Designed for strength and durability, these windows offer protection without compromise.
For even greater security, you can upgrade to our laminate glass option, achieving Secured by Design accreditation—the official UK Police initiative focused on reducing crime through high-quality physical security. With Sheerline, you don’t just get stylish aluminium windows—you get trusted protection for your home.
Let More Light into Your Home
Our ultra-slim aluminium windows are designed to fill your home with natural light, creating bright, open interiors. Available in casement, French, and fixed styles, they offer sightlines as slim as 36.5mm for picture windows and 59mm for opening windows*.
The Classic range is perfect for homeowners who want to bring in more daylight, making rooms feel spacious and inviting while maintaining a sleek, modern aesthetic.
*Beadless sashes: 60.5mm for beaded sashes.
Services
At Energy Efficient Homes, we supply and install high-quality aluminium windows for both homeowners and trade professionals.
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Supply & Installation
We provide premium aluminium windows with expert installation for a seamless finish.
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For Homeowners
Our energy-efficient aluminium windows improve insulation, reduce energy costs, and upgrade your home’s appearance.
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For Tradespeople
We supply high-performance aluminium windows, offering a reliable solution for trade projects.
Whether you need a full installation or supply-only service, we deliver aluminium windows built for style, durability, and efficiency.
Looking for ultra-slim aluminium windows?
If you're considering ultra-slim aluminium windows for your home, you might have some questions about their design, security, and thermal performance. Here, we answer some of the most common queries to help you make an informed decision.
How slim are the sightlines on Classic aluminium windows?
Classic aluminium windows feature ultra-slim sightlines of just 59mm for opening windows and as little as 36.5mm for fixed picture windows. This maximises natural light and creates a sleek, architectural look.
How do these windows improve insulation and energy efficiency?
The Classic system features Thermlock® technology, a multi-chamber thermal design that provides superior insulation compared to traditional polyamide thermal breaks. Combined with high-performance glazing, these windows help keep your home warmer in winter and cooler in summer.
Are Classic aluminium windows secure?
Yes, all Classic aluminium windows are PAS24:2016 accredited, offering advanced security features. You can also opt for a laminated glass upgrade to achieve Secured by Design accreditation, an official UK Police standard for crime prevention.
Can I use Classic aluminium windows for both traditional and modern homes?
Yes, the Classic system is versatile, making it ideal for both heritage properties and contemporary designs. With styling options such as Contemporary, Contemporary Flush, Stepped, and Stepped Flush, these windows suit a range of architectural styles.
What types of Classic aluminium windows are available?
Classic aluminium windows are available in casement, French, and fixed styles. Their ultra-slim frames let in more light and create a sense of space, making them perfect for bright, airy interiors.
Accreditations
Browse Our Aluminium Window Styles
Explore our range of aluminium windows, designed for modern and heritage homes. From sleek contemporary designs to classic heritage styles, find the perfect fit for your home with high performance, security, and energy efficiency.
Visit Our Showroom
Start your home improvement journey at our Marks Tey showroom, where you can explore our full range of products in person.
Conveniently located at Unit 3, Flyover Nurseries, Coggeshall Road (CO6 1LJ), our showroom features working displays and our experienced team is always ready to help.
Latest News
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Areas We Serve
We’re proud to serve homeowners throughout Essex and Suffolk with a comprehensive range of windows, doors and home extensions.
Our expert team brings quality installations to homes across the region, including Colchester, Chelmsford, Clacton-On-Sea, Sudbury, and Ipswich.
