Premium Triple-Glazed Passive House Windows in Ireland
Premium Passive Windows (P2)
The P2 is Bright Vista Group’s certified passive house window system for Ireland: triple-glazed with argon-filled 48mm units, whole-window U-values of 0.78 W/m²K, 46 dB acoustic reduction, and Class 4 airtightness — the highest performance classification. Designed for Irish self-builders, architects, and developers targeting passive house certification or nZEB compliance.
In Ireland, where Atlantic rain, cold winters, and rising energy costs all press on the building envelope, the performance difference between a standard double-glazed window and a P2 is measurable in room temperature, heating bills, and acoustic comfort every single day.
A key part of this is the triple glazed build. Triple glazing helps reduce heat loss more effectively than simpler window systems and supports a more stable indoor temperature throughout the year. That means a warmer home in winter, a quieter indoor environment, and a stronger sense of comfort across the seasons.
P2 Series Technical Performance
To meet the rigorous demands of Passive House standards in the Irish climate, our P2 systems are engineered for maximum thermal retention and airtightness:
Thermal Performance
Whole-window U-values of 0.78 W/m²K, meeting the Passive House Institute (PHI) threshold for window components (Uw ≤ 0.80 W/m²K). Achieved via triple-glazed units with warm-edge spacers and thermally broken frame construction.
Triple Glazing
48mm triple-glazed sealed units with Argon gas filling and warm-edge spacers. Three glass panes with two insulating cavities deliver the thermal and acoustic performance passive house standards require. Low-E coating on internal panes reduces radiant heat loss further.
Acoustic Performance
Sound reduction up to 46 dB — suitable for homes near busy roads, flight paths, or urban noise sources. Achieved via the triple-glazed sealed unit mass and the argon cavity damping effect.
Airtightness
Class 4 airtightness, the highest classification under EN 12207. In practical terms: virtually no uncontrolled air infiltration through the window frame. Essential for passive house standard where controlled mechanical ventilation (MVHR) manages air quality.
SEAI Grant Eligible
P2 passive house windows meet and substantially exceed the SEAI Windows and Doors Grant 2026 U-value threshold of 1.4 W/m²K (P2 achieves 0.78 W/m²K). Eligible for up to 4,000 euros toward replacement costs. Bright Vista Group is an SEAI-registered contractor (No. 19930).
For many clients, passive windows are not only about hitting a technical standard. They are also about creating a better home. A home that feels calmer, more efficient, and more prepared for the future. That is one reason these systems are often chosen for new builds, design-led renovations, and higher-spec residential projects.
For clients where both performance and finish matter, architect-led projects, premium self-builds, and design-led renovations, the P2 system delivers luxury window aesthetics alongside certified thermal performance. Frame profiles are slim despite the triple-glazed unit depth, finish options span the full RAL colour range, and hardware is available in satin, chrome, and powder-coat finishes. High performance does not mean a heavy, institutional look.
At Bright Vista Group, we supply and install P2 passive house windows for new builds, architect-led projects, and high-performance renovations across Ireland. Free site survey and specification consultation included. SEAI grant documentation provided. Showroom at JFK Enterprise Centre, Bluebell, Dublin 12, by appointment.
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Who Specifies Passive House Windows in Ireland
P2 passive house windows are typically specified by:
- Self-builders targeting Passive House certification or nZEB compliance as part of a BER A2/A1 new build.
- Architects working on low-energy or passive house projects who need a system with documented performance data (U-values, g-values, installation specifications).
- Energy consultants and BER assessors calculating compliance for NZEB or Passive House certification.
- Developers building to Part L of the Irish Building Regulations where window U-values contribute to the building’s overall TGD L compliance.
- Homeowners undertaking deep retrofits where the window specification is part of an SEAI One Stop Shop or Home Energy Upgrade programme
Bright Vista Group provides product Declarations of Performance (DOPs), full technical data sheets, and installation specifications in the format architects and energy assessors require.
What Makes Triple Glazing Different in a Passive House Window
A standard double-glazed window has two glass panes with one insulating cavity. The P2 uses three panes and two cavities. Each cavity is filled with argon gas — a heavy, slow-moving gas that conducts heat far less readily than air. The result is a sealed unit that resists heat movement in both directions: keeping heat inside in winter, and reducing solar gain in summer.
Combined with Low-E coatings on the inner panes (which reflect radiant heat back into the room), warm-edge spacers (which prevent cold bridging at the edge of the unit), and the thermally broken frame construction, the P2 achieves a whole-window U-value of 0.78 W/m²K. To put that in context: a standard double-glazed aluminium window achieves around 2.0 W/m²K. The P2 loses more than 60% less heat through the window area.
What Is the Passive House Standard and How Do Windows Qualify?
The Passive House standard was developed by the Passive House Institute (PHI) in Darmstadt, Germany. A building certified to the PHI standard achieves:
- Annual space heating demand of no more than 15 kWh/m² per year.
- Total primary energy demand of no more than 120 kWh/m² per year.
- Airtightness of n50 ≤ 0.6 air changes per hour.
For a window to be used in a PHI-certified building, it must achieve a whole-window U-value (Uw) of 0.80 W/m²K or better. The P2 achieves 0.78 W/m²K, just inside this threshold.
In Ireland, nZEB (nearly Zero-Energy Building) is the regulatory standard for new homes since 2021 under Part L of the Building Regulations. nZEB is less demanding than PHI passive house, but window U-values still directly affect compliance. Any window achieving 0.78 W/m²K easily meets nZEB requirements and positions the home well above the minimum standard.
P2 Passive House Windows and the 2026 SEAI Grant
P2 passive house windows achieve U-values of 0.78 W/m²K — well below the SEAI Windows and Doors Grant 2026 threshold of 1.4 W/m²K. This means they qualify for the highest-performance tier of SEAI grant support.
For eligible homeowners, the 2026 SEAI grant provides up to 4,000 euros toward window replacement costs. Bright Vista Group is an SEAI-registered contractor (No. 19930) and provides Declarations of Performance and contractor documentation for grant applications.
Frequently asked questions
Passive House Windows Ireland
A passive house window is a triple-glazed, thermally broken window system engineered to achieve whole-window U-values of 0.80 W/m²K or better, the threshold set by the Passive House Institute (PHI) for use in PHI-certified buildings. The P2 by Bright Vista Group achieves 0.78 W/m²K, combining triple-glazed 48mm argon-filled units, warm-edge spacers, and Class 4 airtightness.
A double-glazed window has two glass panes and one gas-filled cavity. A triple-glazed window has three panes and two cavities, doubling the insulating layers. The P2’s triple-glazed 48mm unit achieves a U-value of 0.78 W/m²K compared to approximately 2.0 W/m²K for a standard non-broken aluminium double-glazed window — more than 60% less heat loss.
Passive certified refers to a window or building component that has been tested and approved by the Passive House Institute (PHI) in Darmstadt, Germany. For windows, PHI certification requires a whole-window U-value (Uw) of 0.80 W/m²K or better. A PHI-certified window can be specified with confidence in any passive house project because its performance has been independently verified.
No. The P2 system delivers passive house thermal performance in a slim, architecturally refined frame. Profile depths accommodate the 48mm triple-glazed unit without bulky external sightlines. Finish options span the full RAL colour range with dual-colour capability. The P2 is used in architect-led premium self-builds precisely because high performance and refined aesthetics are not mutually exclusive.
nZEB (nearly Zero-Energy Building) is Ireland’s mandatory standard for new homes under Part L of the Building Regulations since 2021. Passive House (PHI) is a more demanding voluntary standard that goes beyond nZEB. All passive house windows exceed nZEB window U-value requirements. BVG can advise on which specification is right for your project, both nZEB-compliant and passive-house-standard systems are available.
Yes. P2 windows achieve U-values of 0.78 W/m²K, well below the SEAI 2026 grant threshold of 1.4 W/m²K. Bright Vista Group is an SEAI-registered contractor (No. 19930). The grant provides up to 4,000 euros toward replacement window costs for eligible Irish homes.