AT-ECO supplies Passive House-compliant windows & doors for ultra-efficient homes. Explore triple-glazed, low U-value solutions from Internorm, Reynaers, Schüco & Drutex for superior comfort & energy savings.
Welcome to Sustainable Comfort. At AT-ECO, we provide Passive House-compliant windows and doors for those building ultra-efficient homes or upgrading to low-energy living. This page introduces the principles of Passive House design and how our high-performance products support your project's energy goals.
A Passive House is a voluntary building standard focused on extreme energy efficiency, comfort, and indoor air quality. Developed by the Passivhaus Institute in Germany, this standard reduces heating and cooling energy demand by up to 90% compared to conventional buildings.
A Passive House relies on:
| Metric | Requirement |
|---|---|
| Space Heating Demand | ≤ 15 kWh/m²/year |
| Primary Energy Demand | ≤ 120 kWh/m²/year |
| Airtightness | ≤ 0.6 air changes/hour @50Pa |
| Window U-Value | ≤ 0.80 W/m²K (recommended) |
Additional criteria include thermal bridge-free detailing and high-performance fenestration.
| Product | U-Value (W/m²K) | Glazing | Frame Material | Passive Certified |
|---|---|---|---|---|
| Internorm HF510 | ~0.72 | Triple | Timber-Aluminium | Yes |
| Internorm KF410 | ~0.71 | Triple | uPVC-Aluminium | Yes |
| Drutex IGLO ENERGY | ~0.71 | Triple | uPVC | Yes |
| Reynaers MasterLine 10 | ~0.80 | Triple | Aluminium | Yes |
| Schüco AWS 90.SI+ | ~0.79 | Triple | Aluminium | Yes |
Passive House is intended for new builds. EnerPHit is the equivalent standard for retrofits, allowing flexibility while maintaining rigorous performance standards. AT-ECO supports both.
We’ve delivered Passive House installations across Sevenoaks, Kent, and other exposed rural sites requiring rigorous energy standards.
We cover London and the South & East of England, including:
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.
The renovation project was successfully completed on schedule, surpassing initial insulation and energy efficiency goals by an impressive 70% and delivering a sleek, contemporary finish.
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Explore Harriet's Lodge, a House of the Year nominated new build in Southampton, featuring AT-ECO timber-aluminium windows, Passive House standards, and smart home integration.
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Explore Charlie Luxton's stunning Passive House new build in Beanacre, Oxfordshire, achieving an A++ energy rating with AT-ECO timber-aluminium windows, MVHR, and smart home tech.
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Explore Stockhouse Farm, award-winning A++ Passive House terraced homes in Surrey designed for modern families, blending traditional design with cutting-edge energy efficiency.
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Explore The Cook's House: a contemporary detached house in Gloucestershire blending classic architecture with sustainable design and AT-ECO timber-aluminium windows.
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Explore Blackwood, an award-winning Passive House in urban Bedfordshire ('Best Self Build' 2023) featuring AT-ECO triple glazing, solar blinds, and airtight construction for max energy efficiency.
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Explore this stunning coastal new build in Bexhill on Sea, East Sussex, featuring AT-ECO high-performance triple glazing and marine-grade finishes for resilience & maximised views.
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See the Squirrels Chase project: a home transformation in Bromley enhancing thermal performance, comfort, & curb appeal by replacing windows & doors with AT-ECO Internorm systems.
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Explore Hunters Hill, an exceptional Passive House in Guildford showcasing sustainable living with AT-ECO high-performance windows, solar panels, Tesla batteries, and Loxone smart home tech.
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Explore Lower Priory Farm: a luxurious new build in Stanmore, London, blending contemporary design with sustainability and featuring expansive glass & AT-ECO timber-aluminium windows.
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Explore Chalkwood: a modern coastal Passive House in St Margaret's at Cliffe, Dover, featuring AT-ECO windows/doors, marine-grade finishes, and stunning sea views for sustainable living.
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Explore Tanglewood: a unique Passive House in St Margaret's at Cliffe, Dover, recessed into the landscape, blending design with nature & AT-ECO high-performance windows for a sustainable retreat.
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Explore Blenheim Terrace: a collection of three luxury townhouses in London's St John's Wood conservation area, blending modern design with traditional charm & AT-ECO high-performance windows.
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Explore the Notting Hill Gate South Block refurbishment in London, blending modern Schüco curtain walling with 1950s architecture for enhanced energy efficiency & style.
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Explore Slips House: an innovative Paragraph 80 home in Hertfordshire's AONB, integrated into the landscape with a grass arch & Reynaers systems for outstanding sustainability.
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Explore 'Forty': a sustainable London family home featured on Grand Designs, showcasing AT-ECO high-performance triple glazing & Passive House principles for urban living.
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Explore Black Barn Studios: an award-winning sustainable workspace in Oxfordshire, a repurposed barn achieving Passivhaus principles with AT-ECO high-performance windows & exceptional airtightness.
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Explore Market Place: a luxury apartment development in Henley-on-Thames, combining rustic charm with contemporary living & AT-ECO high-performance windows/doors.
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Explore Skyridge: an award-winning sustainable contemporary home in Surrey Hills with an A-96 energy rating, featuring AT-ECO high-performance glazing & smart systems.
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See the Petersfield renovation in East Hampshire, enhancing comfort & style with AT-ECO Internorm windows & doors, including integrated blinds, for improved energy efficiency.
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Explore Lamorna: a sensitive 1960s Cotswold renovation blending contemporary design with conservation needs, featuring AT-ECO high-performance glazing & curtain walling for a low-energy home.
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Explore the transformation of Market Road: a former London printworks into a sustainable 45,000 sq ft office HQ, blending modern design with industrial heritage using AT-ECO Reynaers systems.
View the projectStay informed with detailed material comparisons, installation tips, and practical maintenance strategies designed to maximise the longevity and performance of your windows and doors.
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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.
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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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