Elegant Angles. Expansive Views. Timeless Appeal.

A bay window projects outward from the main walls of a building, creating a striking architectural feature while allowing more light and space inside.

Whether you’re updating a period property or adding character to a new build, bay windows provide a stunning focal point that enhances natural light, ventilation, and exterior aesthetics.

Choose Internorm for Passive House-rated timber-aluminium solutions, Drutex for versatile and efficient uPVC options, or Reynaers and Schüco for slimline aluminium designs ideal for modern homes.

Bay Windows in uPVC

🏠 What Is a Bay Window?

A bay window is a multi-panelled window unit that extends outward from the property facade, usually at 30°, 45°, or 90° angles. It typically consists of a central fixed pane flanked by casement, tilt-and-turn, or other operable side units.

Bay windows increase interior floor space, create seating or display areas, and significantly boost both light and views.

What is a bay window

Where Bay Windows Work Best

  • Living rooms or lounges to open up floor space and enhance daylight
  • Period homes and traditional facades for visual continuity
  • Modern extensions seeking bold architectural features
  • Bedrooms, dining areas, and home offices looking for panoramic views

Why Choose AT-ECO?

We have extensive experience supplying and installing bay windows from Europe’s most respected manufacturers. Our FENSA-certified team ensures proper structural integration, weatherproofing, and aesthetic detailing.

We work closely with homeowners, architects, and builders to configure the perfect layout and opening mechanisms to suit your space, energy targets, and style preferences.

📊 Bay Window System Comparison

Feature Internorm HF 410 / HF 520 Drutex IGLO 5 / IGLO Energy Reynaers SlimLine 38 / CS 77 Schüco AWS 75.SI+ / AWS 90.SI+
Material Timber-Aluminium uPVC Aluminium Aluminium
Thermal Performance Uw up to 0.64 W/m²K ~0.79–1.1 W/m²K ~0.8–1.0 W/m²K ~0.65-1.28 W/m²K
Angle Configurations Customisable Customisable Customisable Customisable
Opening Options Fixed / Tilt & Turn Fixed / Tilt & Turn Casement / Fixed / Tilt & Turn Casement / Fixed / Tilt & Turn
Aesthetic Style Flush, Modern, or Classic Sculpted or Bevelled Slimline / Functional Minimalist, Concealed Hardware

Frequently Asked Questions

Usually no, if replacing an existing bay or within permitted development limits. Always check with your local authority for new structural extensions.

Yes. All our bay systems support both, depending on the thermal requirements and chosen brand.

We offer fixed, casement, and tilt-and-turn combinations depending on system and layout. Each sash can be tailored to your needs.

Absolutely. Our systems feature thermal breaks, triple glazing options, and airtight construction to meet or exceed UK performance standards.

🌿 Sustainability at the Core

  • Internorm uses FSC-certified timber and recyclable aluminium
  • Drutex uPVC includes recycled content and low-emission materials
  • Reynaers and Schüco aluminium systems are recyclable and available in low-carbon variants
  • Energy-efficient glazing reduces heat loss and long-term energy usage

Warranty & Support

Bay window guarantees vary depending on the selected brand and product.

For full warranty details tailored to your configuration, please contact us directly.

Areas We Serve

We cover London and the South & East of England, including:

  • London
  • Kent
  • Essex
  • East Sussex
  • West Sussex
  • Surrey
  • Hertfordshire
  • Oxford
  • Oxfordshire
  • Cambridge
  • Cambridgeshire
  • Wiltshire
  • Buckinghamshire
  • Bedfordshire

Recent Work

Working closely with architects, builders, and homeowners, we’ve delivered systems that combine thermal efficiency, modern aesthetics, and long-term durability—across private residences, sustainable developments, and architect-led designs.

Expert Advice & Insights

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Homebuilding & Renovating Show

Creating your dream home? Visit the Homebuilding & Renovating Show! Expert advice, top brands & real inspiration—all in one place. We’re exhibiting, come say hi! 👋

Build It Live South East

Yes, we recommend booking an appointment to ensure personalised service and availability. You can schedule your visit by filling out our contact form or emailing us at [email protected].

During your visit, our team will guide you through our range of premium window and door systems. We’ll answer your questions, help you explore customisation options, and assist in finding the perfect solution for your project.

Absolutely! Bringing your project plans or drawings can help our team better understand your needs and provide tailored recommendations.

Our knowledgeable team is here to help. Whether you need advice on materials, styles, or energy efficiency, we’ll guide you through the process and ensure you make an informed decision.

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