Frequently Asked Questions

Passive housing can reduce energy consumption for heating and cooling by up to 90% compared to conventional buildings, resulting in significantly lower utility bills. These homes provide exceptional, year-round comfort with consistent temperatures, superior indoor air quality via ventilation systems, and a quiet, draught-free, and sustainable living environment.

Passivhaus standards are exceptionally strict and are globally recognised as the leading, most rigorous benchmark for energy-efficient construction, requiring up to 75-90% less heating energy than conventional buildings. The three key requirements are an annual heating and cooling demand limit of 15 kWh/m² per year, exceptional airtightness demonstrated by a maximum of 0.6 air changes per hour, and a total primary energy consumption limit of 60 kWh/m² per year for all domestic uses. Certification requires meticulous design, high-quality components, and a mandatory blower door test to ensure the required airtightness is achieved.

Passive housing, or Passivhaus, is a rigorous, voluntary standard for energy efficiency in buildings that delivers ultra-low energy consumption for heating and cooling. It focuses on maximising heat retention and minimising energy demand through five core principles: excellent insulation, thermal-bridge-free construction, high-performance windows and doors, heat-recovery ventilation, and exceptional airtightness.

Double glazing features two panes of glass with an insulating gap, while triple glazing adds a third pane for enhanced thermal and acoustic performance. Triple glazing significantly reduces heat loss, improves energy efficiency, and enhances comfort.

While triple glazing has a higher initial cost than double glazing, the investment is often offset by substantial long-term savings on energy bills. Furthermore, it provides superior thermal comfort, reduces noise pollution, and contributes to a higher BREEAM or Passivhaus rating for the property.

The additional pane and gas layer drastically reduce the window’s U-value, often achieving figures around 0.6 W/m²K or lower depending on system specification. This means less heat escapes your home in winter and less heat enters in summer, lowering your reliance on heating systems and reducing energy bills.

Triple glazing uses three panes of glass separated by two gas-filled spacers, typically argon or krypton. These cavities act as insulating layers, while low-emissivity (Low-E) coatings reflect heat back into the room. The result is significantly improved thermal performance and enhanced sound insulation compared to standard double glazing.

Yes, by minimising heat loss, thermally efficient windows, doors, and rooflights reduce the need for constant heating, leading to lower energy consumption. This directly translates into reduced heating bills and a smaller carbon footprint.

Our products are engineered using advanced technologies, including composite timber-aluminium systems and aluminium profiles with specialised thermal breaks, which significantly reduce heat conduction. By combining high-performance glazing units with precisely manufactured frames and airtight installation detailing, we deliver systems that drastically reduce heat loss in winter while moderating excessive solar gain in summer.

Thermal efficiency refers to a material or system’s ability to minimise the transfer of heat. In construction, this primarily means preventing heat loss from inside the building during cold weather and restricting excessive heat gain during warm weather. High thermal efficiency in windows and doors is achieved through high-quality materials, like thermal breaks, and advanced glazing options.

We’re proud to partner with premium European brands chosen for their superior thermal efficiency, architectural flexibility and commitment to quality.

Aluminium-Clad Timber Windows with triple glazing are among the most thermally efficient, due to the insulation properties of the timber frame, which is protected externally by a weather-resistant aluminium cladding. High-performance aluminium systems from Velfac and Internorm also offer excellent insulation thanks to advanced thermal break technology.

Double glazing features two panes of glass with an insulating gap, while triple glazing adds a third pane for enhanced thermal and acoustic performance. Triple glazing significantly reduces heat loss, improves energy efficiency, and enhances comfort.

A Passive House-certified build requires five key principles: incredible insulation and airtight construction with thermally efficient doors and windows, a mechanical ventilation system with heat recovery, and a thermal-bridge-free design. The glazing must achieve extremely low U-values to maintain stable indoor temperatures year-round. 

Lead times vary significantly depending on the complexity, scale, and specific components required for the bespoke system. A smaller, less complex project might have a shorter timeline, while large-scale structural glazing or custom-engineered façade systems require more extensive design, fabrication, and quality control. 

Yes, we offer a complete, end-to-end service, including professional installation for all our bespoke glazing products. Our installations are carried out by our own team of experienced fitters to ensure precision and quality on-site.

The process typically begins with a consultation where we discuss your architectural plans and design intent. Using our advanced in-house CAD capabilities, we craft detailed solutions tailored to each client’s specifications and requirements.

As all of our rooflights are bespoke and made-to-order, lead times vary depending on the complexity of the design, the size of the unit, and the current manufacturing schedule. We provide an estimated lead time during the quotation phase.

Yes, Anglezarke rooflights are designed and engineered for exceptional thermal performance. We use slimline, thermally broken aluminium frames and high-specification insulated glass units, double or triple-glazed, to ensure excellent U-values, minimising heat loss and preventing condensation.

Technically, a rooflight is a fixed or opening glazed unit designed to be installed flush or slightly raised within a flat roof. At the same time, a skylight typically refers to a window installed within a pitched roof. In modern terms, however, the terms are often used interchangeably to refer to any glazed structure installed in a roof to admit daylight. 

Yes, many of our high-performance door systems, including certain Timber Aluminium and Aluminium Entrance Door ranges, are engineered with enhanced thermal breaks and insulation to achieve the exceptional U-values required for Passive House and highly energy-efficient construction.

All Anglezarke doors are designed with multi-point locking systems and robust, thermally broken frames to meet or exceed current security standards. Specific certifications vary by system, and details are available upon request.

Our comprehensive door portfolio includes systems in three primary material types: thermally broken aluminium, timber, and timber-aluminium composites, allowing us to specify a solution that perfectly matches your design, thermal performance, and aesthetic requirements.

Our showroom is located at Abbey Mill, Garden St, Abbey Village, Chorley, PR6 8DN. Get in touch with us to book an appointment.

After installation, we conduct comprehensive inspections to uphold our quality standards and remain available for any necessary adjustments, ensuring the final results exceed expectations. 

Our skilled installation team adheres to specified designs and regulations, prioritising safety and craftsmanship. We maintain open communication, providing progress updates and addressing concerns promptly, resulting in a seamless installation experience.

Yes, our in-house manufacturing of exclusive aluminium glazing systems sets us apart, engineered to deliver a distinct blend of visual elegance and technical excellence. Our extensive library of intellectual property and original designs represents years of dedicated innovation. These proprietary systems offer our clients unique glazing options that aren’t available anywhere else, making every installation a truly individual statement.

Our advanced in-house CAD (Computer-Aided Design) capabilities enable us to craft bespoke solutions tailored to each client’s individual requirements and aspirations. We ensure every project achieves not only the intended aesthetic but also high performance in areas such as thermal efficiency, structural integrity, and longevity.

Our Frameless Window system is ideal for premium residential projects; it is specifically engineered to provide expansive, floor-to-ceiling glazing with no visible outer frame, achieving a seamless, refined plaster-to-glass finish internally and allowing for over-cladding externally.

Yes, many of our window systems, particularly our Aluminium, Aluminium-Clad Timber, and Aluminium-Clad uPVC ranges, are designed around advanced European systems to deliver exceptional thermal performance, making them highly suitable for high-performance, energy-efficient, and low-energy building projects.

Aluminium-Clad Timber windows feature an engineered timber core for internal warmth and high insulation, with an external aluminium shell for weather resistance, while Aluminium-Clad uPVC windows use a highly insulated uPVC core for thermal efficiency and cost-effectiveness.

Our bespoke products are manufactured to order in Europe; lead times vary depending on the specific brand and glazing system, level of bespoke manufacture, and project specification. A clear and accurate production timeline is always provided at the quotation stage, allowing each project to be programmed confidently from design approval through to installation.

We welcome clients and design professionals to visit our Abbey Mill headquarters, which combines a showroom with our in-house manufacturing facility. You’ll be able to view full-scale glazing systems and material samples and see bespoke windows and doors being crafted with precision. Experiencing both the finished products and the manufacturing process provides clear insight into the quality, detailing, and performance behind every project.