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Most homeowners have heard of a BER rating. Many have one filed away somewhere with their property paperwork. But fewer understand what the certificate actually measures, how windows and doors influence the result, or why it now matters more than ever when it comes to grant eligibility. If you are thinking about upgrading your windows, your BER is worth understanding before you start.

What a BER rating tells you

A Building Energy Rating is an indicator of how much energy your home needs for heating, hot water, ventilation, and lighting. It is based on the building itself, the fabric of the walls, the quality of insulation, the type of heating system, and the performance of the windows and doors. It is not based on how you use the home or how many people live there. Ratings run from A1, the most efficient, down to G, the least. Most homes built before 2005 fall somewhere between C and F, depending on what upgrades have been carried out since construction.

Since 2009, a BER certificate has been mandatory for any property being sold or rented in Ireland. A registered SEAI BER assessor carries out the assessment, which typically takes one to two hours for a standard home. The assessor measures floor areas, wall thicknesses, insulation types, heating system details, and the condition and specification of every window and door in the property.

The Heat Loss Indicator

Alongside the BER rating itself, the assessment produces an Advisory Report containing a figure called the Heat Loss Indicator, or HLI. This measures how quickly heat escapes through the building envelope, expressed in W/K per square metre. A lower number means the building retains heat more effectively.

The HLI has become particularly important since the launch of the SEAI windows and doors grant in March 2026. To qualify for the standalone grant, your home must achieve an HLI of 2.3 W/K·m² or lower after the upgrade is completed, or the BER Advisory Report must rate both attic and wall insulation as “Good” or “Very Good”. This insulation requirement is the most common reason applications are refused. Understanding your HLI before you apply helps avoid that situation.

How windows affect your BER

Windows and doors are one of the key inputs in the BER calculation. The assessor records the type of glazing (single, double, or triple), the frame material, the U-value where available, and the overall condition of the units. Older single-glazed or early double-glazed windows with aluminium or degraded timber frames will pull the rating down significantly. Upgrading to modern high-performance units with low U-values, warm-edge spacer bars, and airtight installation can shift a home’s BER by one or two full grades.

In practical terms, moving from a D to a C or from a C to a B is not just a number on a certificate. It represents measurably lower energy consumption, reduced heating costs, and a more comfortable home. It also increases property value. Research consistently shows that homes with higher BER ratings sell for more and attract buyers faster.

Getting a BER before you upgrade

If you are considering a window upgrade, getting a BER assessment first is a practical starting point. The Advisory Report will tell you your current HLI, identify whether your insulation meets the grant threshold, and show you exactly where heat is being lost. This allows you to plan your upgrade with full visibility of the starting position and the likely impact of new windows and doors on the final rating.

SEAI offers a €50 grant towards the cost of a BER assessment, which typically costs between €150 and €300 depending on the size of the property. It is a modest investment that can save significant time and money by confirming your eligibility before you commit to a project.

Where Fairco fits in

Fairco’s windows and doors are engineered to deliver the thermal performance that supports meaningful BER improvements. Whether you are upgrading with double or triple glazing, choosing Performance uPVC, OMNIA Flush, or aluminium, every product is manufactured to deliver low U-values and airtight installation that contributes directly to a better energy rating.

If you would like to understand how a window upgrade could affect your BER and your eligibility for the SEAI grant, book a free consultation with the Fairco team.

Not every period home sits within a conservation area. Across Dublin and beyond, there are thousands of Victorian, Edwardian, and early twentieth-century properties that carry genuine architectural character but are not subject to the formal planning restrictions that apply to protected structures or architectural conservation areas. For homeowners in these properties, this creates a valuable opportunity: the freedom to choose heritage-style windows for aesthetic reasons alone, without the constraints of heritage consent or planning conditions.

Choosing character, not just compliance

In a conservation area, the window specification is often dictated by planning requirements. Proportions, materials, glazing bar patterns, and sash horn details may all be prescribed to preserve the streetscape. Outside those areas, the choice is entirely yours. You can select heritage-style windows because they suit the character of your home, not because a planning authority requires them.

This distinction matters because it opens up more flexibility in how the heritage look is achieved. Homeowners can choose the level of period detail that feels right for their property, from a faithful replication of the original joinery right down to run-through horns and slim meeting rails, to a simpler sash profile that captures the essence of the style without every traditional flourish.

Sash windows and the details that define them

The sliding sash window is the defining feature of most Irish period homes. Its vertical proportions, balanced movement, and slender sightlines give a building a sense of craft and permanence that standard casement windows cannot replicate. When done well, a modern sash window is almost indistinguishable from a traditional timber original, but without the ongoing maintenance that timber demands.

The details are what make the difference. Sash horns, for example, are the small projections at the bottom corners of the upper sash. Originally a structural reinforcement in Victorian joinery, they are now primarily a design feature, but one that immediately signals authenticity. Run-through horns, which are formed as a seamless extension of the frame stile, offer the most convincing appearance. Clip-on horns provide a more cost-effective alternative while still capturing the period silhouette. Ornate Seahorse-style horns suit Victorian properties with more decorative detailing, while a horn-free finish is appropriate for Georgian proportions where the original windows would not have featured them.

Other details that contribute to an authentic appearance include deep bottom rails, astragal glazing bars, slim meeting rails, and a natural woodgrain finish on the uPVC profile. Together, these elements create a window that respects the character of the building without requiring any of the maintenance associated with traditional timber.

Two ranges, one standard of quality

Fairco offers two distinct sash window options. The Heritage Sash range is designed for properties where the highest level of period accuracy is required. It features run-through horns with no visible cap or shadow line, an ultra-slim 35mm meeting rail, true end-sealed mechanical joints, and a profile that closely mirrors traditional timber joinery. It is the natural choice for conservation area projects, but it is equally suited to period homes outside those areas where the homeowner simply wants the best possible sash window.

For properties where a traditional look is desired but the full Heritage Sash specification is not essential, Fairco’s standard Sash range delivers the charm of a sliding sash with all the performance benefits of modern uPVC, including double glazing as standard, multi-point locking, tilt-in cleaning, and a choice of period-appropriate colours and finishes.

Performance behind the period look

Whichever range suits your property, the performance underneath is thoroughly modern. Both Fairco sash ranges deliver strong thermal insulation, advanced weather sealing, and PAS 24:2022 certified security. There is no trade-off between character and comfort. A well-specified sash window will keep your home warmer, quieter, and more secure than the timber original it replaces, while looking every bit as authentic from the street.

If you own a period home and want windows that honour its character without the constraints of a conservation area, book a free consultation with the Fairco team. We can help you choose the right level of heritage detail for your property and ensure the finished result looks as good as it performs.

Open-plan layouts have become a defining feature of modern Irish homes, whether in new builds or rear extensions to existing properties. The connection between kitchen, living, and garden spaces relies heavily on how the transition between indoors and outdoors is handled. Sliding doors, bi-fold doors, and large-format glazing are often the elements that make an open-plan design work, bringing in natural light, creating a sense of space, and providing direct access to patios, decks, and gardens.

Choosing the right door type

The right choice depends on the opening width, the available wall space, and how you want the door to operate day to day.

Sliding doors are ideal where wall space is limited. The panels glide along a track rather than swinging inward or outward, which means no floor area is lost to the door arc. They are well suited to kitchens and living rooms that open onto a patio or garden, and can accommodate wide openings with slim sightlines that maximise the glass area.

Bi-fold doors fold back in concertina panels, creating an almost fully open wall when the weather allows. They work best for wider openings where you want the option to remove the boundary between inside and outside entirely, ideal for entertaining or for homes where the garden is an extension of the living space.

French doors remain a popular choice for more traditional properties or smaller openings. They provide a wide, unobstructed access point and pair well with sidelights or fixed panels to increase the overall glazed area.

Light and spatial impact

The primary benefit of large-format glazing in an open-plan layout is natural light. A well-positioned sliding or bi-fold door can transform how a room feels, reducing the need for artificial lighting during the day and creating a visual connection to the garden that makes the interior feel significantly larger.

Fairco’s aluminium systems are particularly effective in this context. Their slim frame profiles allow for maximum glass area, which is important when the goal is to flood a space with light. For homeowners who prefer uPVC, the OMNIA Flush range offers a clean, contemporary aesthetic with strong thermal performance.

Thermal performance in large openings

A common concern with large glazed openings is heat loss. In Ireland’s climate, it is a legitimate consideration. However, modern sliding and bi-fold door systems are engineered to deliver strong thermal performance even at scale. Thermally broken aluminium frames, multi-chambered uPVC profiles, double or triple glazing with low-emissivity coatings, and precision-fitted seals all contribute to keeping U-values low and warmth where it belongs.

Fairco’s door systems are tested for air permeability, water tightness, and wind resistance, ensuring they perform in exposed and coastal locations as well as sheltered suburban settings. Combined with PAS 24:2022 certified security, large openings do not need to mean compromised performance or protection.

Making it work for your home

The best results come from early planning. Orientation, opening configuration, frame material, glazing specification, and threshold design all influence how a sliding or bi-fold door performs in practice. Fairco’s design team can advise on the right combination for your layout, your budget, and your priorities, whether you are building from scratch or adding a rear extension.

Book a free consultation to explore your options, or visit our showrooms to see sliding, bi-fold, and French door systems in person.

Bathrooms and kitchens are the two rooms in the house that generate the most moisture. Showers, baths, boiling water, cooking steam, and the daily cycle of hot and cold air all create conditions that place specific demands on windows. Getting the specification right in these rooms is not just about aesthetics. It is about managing moisture, maintaining ventilation, and ensuring long-term performance in an environment that is harder on windows than any other part of the home.

Moisture and condensation

Condensation forms when warm, moist air meets a cold surface. In bathrooms and kitchens, this happens frequently and often intensely. If the internal glass surface temperature is too low, moisture will settle on the window, run down the glass, and pool on the sill. Over time, this leads to mould growth, damage to paint and plaster, and potential deterioration of the window reveal.

The glazing specification makes a direct difference here. Windows with low U-values keep the internal glass surface warmer, reducing the temperature gap that causes condensation to form. Triple glazing performs better than double in high-moisture rooms because the inner pane stays closer to room temperature. Warm-edge spacer bars also play an important role by reducing heat loss at the glass perimeter, which is where condensation typically appears first.

Ventilation that works with moisture, not against it

Removing moisture-laden air quickly and efficiently is essential in both rooms. Extractor fans handle the bulk of the work, but windows provide a valuable secondary ventilation route and, in many bathrooms, the primary one.

Tilt-and-turn windows are particularly effective in these spaces. In the tilt position, the window opens inward from the top, allowing warm, moist air to escape at ceiling level where it naturally rises, while keeping the lower part of the window closed. This provides efficient ventilation at floor level without draughts and without rain entering the room. It also means the window can remain open during a shower or while cooking without compromising security, which matters in ground-floor bathrooms or kitchens that face a public area.

Built-in trickle vents offer continuous background ventilation even when the window is fully closed. In rooms where moisture builds up quickly, this steady airflow helps prevent condensation from forming in the first place. More on how ventilation and energy efficiency work together is covered in our practical tips guide.

Privacy without sacrificing light

Bathrooms in particular often face a neighbour, a side passage, or a street. Privacy is a priority, but so is natural light. Obscured or frosted glass provides an effective solution, allowing daylight to enter the room while preventing a clear view from outside. Several levels of obscurity are available, from a light texture that softens the view to a heavy frost that blocks it almost entirely.

The choice depends on the room’s position and the level of privacy required. A first-floor bathroom may only need a light obscure, while a ground-floor window facing a footpath will benefit from a heavier grade. Fairco can advise on the right level for your situation and supply obscured glass as part of the standard glazing specification, with no compromise on thermal performance or security.

Practical considerations

Beyond glazing and ventilation, there are a few practical points worth thinking about. Windows above kitchen worktops or behind sinks should be easy to open and close without leaning across surfaces. Tilt-and-turn handles are operated with a single hand from a comfortable position, making them well-suited to these locations. uPVC frames require no repainting and are easy to clean with a damp cloth, which matters in rooms where grease, steam, and cleaning products are part of daily life. Safety glazing regulations apply to any window with a sill height below 800mm from floor level, which is common in both kitchens and bathrooms.

If you are upgrading your kitchen or bathroom windows, or planning a renovation that includes these rooms, Fairco’s team can help you choose the right combination of glazing, ventilation, privacy, and opening style. Book a free consultation or visit our showrooms to see the options in person.

Ireland has over 7,500 kilometres of coastline. From the exposed Atlantic coast of the west to the Irish Sea shoreline of Dublin and Wicklow, thousands of homes sit within direct reach of salt-laden air, wind-driven rain, and sustained exposure to some of the harshest weather conditions in northern Europe. For these properties, the specification of windows and doors is not just an energy or aesthetic decision. It is a durability decision, and getting it wrong can be expensive.

What the coast does to windows and doors

Salt air is corrosive. It attacks metal components, degrades unprotected finishes, and accelerates the ageing of hardware, seals, and fixings. Properties within a few kilometres of the shoreline are exposed to airborne salt on a near-daily basis, and the effect compounds over years. Hinges can stiffen or seize. Locking mechanisms can pit and corrode. Unprotected aluminium finishes can degrade within a decade. Even stainless steel fixings are not immune if they are not specified to the correct grade for marine environments.

Wind-driven rain presents a different challenge. Ireland’s prevailing south-westerly winds carry moisture horizontally against the building envelope, testing the water-tightness of every window and door junction. Standard products tested under moderate conditions may perform adequately inland but fail to keep water out when subjected to the sustained pressure differentials that exposed coastal locations produce.

Why material choice matters more on the coast

uPVC is inherently well-suited to coastal environments. It does not corrode, does not require repainting, and is unaffected by salt air. The frame material itself will not degrade in the way that untreated timber or unprotected metals can. This is one of the reasons uPVC remains the most popular choice for coastal properties across Ireland. Fairco’s Performance uPVC and OMNIA Flush ranges are manufactured using the highest grade of uPVC available for domestic applications, ensuring long-term stability in exposed conditions.

For homeowners who prefer the slimmer sightlines and contemporary aesthetic of aluminium, material quality becomes even more critical. Not all aluminium window systems are equal in coastal performance. Thermally broken aluminium profiles with high-quality powder-coated or marine-grade finishes offer significantly better long-term durability than standard finishes. The quality of the coating, its thickness, and how well it has been applied all determine how long the frame resists the effects of salt and UV exposure.

Severe weather testing

Windows and doors are tested for three key weather performance criteria under EN 14351-1: air permeability, water tightness, and wind resistance. Each is rated on a classified scale, and the ratings a product achieves determine the conditions it is suitable for.

For coastal and exposed locations, specifying products that have been tested to higher classifications in all three categories is essential. A product rated for moderate exposure may pass building regulations but still allow water ingress or draughts under the sustained wind pressures that coastal properties experience during winter storms. Fairco products are severe weather tested and manufactured to consistent tolerances, ensuring that the performance demonstrated in laboratory testing translates to real-world conditions on site.

Hardware and seals

The frame material often gets the attention, but hardware and seals are equally important in coastal specifications. Locking mechanisms, hinges, and friction stays must resist corrosion over the full life of the window. EPDM gaskets and weather seals need to maintain flexibility and compression despite constant exposure to salt, UV, and temperature cycling. Products with PAS 24:2022 certification are tested under rigorous mechanical and impact conditions, which provides a baseline of confidence in hardware durability, but coastal specification may warrant additional attention to the grade of stainless steel used in fixings and the quality of the seal system.

Specification for peace of mind

If your home is on or near the coast, it is worth discussing your location and exposure with your window supplier at the outset. Orientation, elevation, proximity to the shoreline, and whether the property is sheltered or fully exposed all influence the right specification. The difference between a product that performs well for a decade and one that performs well for 25 years often comes down to details that are invisible once the window is installed: the seal compound, the hardware grade, the coating quality, and the testing classification.

Fairco’s team can assess your property’s exposure and recommend the right combination of materials, glazing, and hardware for lasting coastal performance. Book a free consultation to discuss your project.

Whether you are building a new home or upgrading the windows in an existing property, the end goal is the same: high-performance windows and doors that look right, insulate well, and last. But the path to getting there is different in each case. Regulations, structural realities, and the impact on your home’s energy rating all vary depending on the type of project, and understanding these differences early helps avoid costly mistakes or missed opportunities.

Regulatory differences

New builds in Ireland must comply with Part L of the Building Regulations, which sets minimum energy performance standards for the entire dwelling. Under the current Nearly Zero Energy Building (NZEB) requirements, windows and doors must contribute to an overall energy model that accounts for insulation, airtightness, heating systems, and renewables. This means the glazing specification is not considered in isolation. It is part of a calculated whole-building approach, giving architects and specifiers some flexibility to balance U-values across different elements.

For renovations, the picture is different. Replacement windows must meet minimum elemental U-value requirements regardless of what else is happening in the building. If you are replacing windows in an existing home, each unit needs to meet the performance threshold on its own merit. There is also the question of whether the project triggers the major renovation threshold, which applies when more than 25% of the building envelope is being upgraded. If it does, the NZEB requirements for new builds come into play, raising the compliance bar significantly.

Planning permission adds another layer for renovation projects. Most like-for-like replacements are exempt from planning permission, but changes to window size, shape, or placement, or work on properties in conservation areas, may require formal consent.

Structural and practical constraints

In a new build, openings are designed around the windows. Wall depth, lintel positioning, insulation zones, and service runs are all planned with the final window specification in mind. This gives the design team full control over how the window integrates with the building envelope, including where it sits within the wall depth for optimal thermal bridging performance.

Renovations rarely offer that luxury. Existing openings are fixed. Wall construction varies, sometimes within the same property. Lintels may be undersized for heavier triple-glazed units. Reveals may be shallow, limiting frame depth options. And older walls may present challenges for achieving an airtight seal around the frame. None of these are insurmountable, but they require careful survey work and product selection to ensure the new windows perform as intended within the constraints of the existing structure.

BER impact

For new builds, the BER is calculated at design stage and must meet a minimum A2 or A3 rating. Windows are a key input in that calculation, and specifying high-performance glazing, whether double or triple, directly affects the modelled result.

For renovations, the BER impact of new windows can be dramatic, particularly in older homes where existing glazing is single or early double. Upgrading to modern high-performance units can shift a home’s BER by one or two grades, which in turn affects property value and eligibility for SEAI grant support. In many cases, windows are the single most visible and impactful upgrade a homeowner can make to their energy rating.

Getting the specification right

The key takeaway is that specification is not one-size-fits-all. A new build allows for an integrated design approach where windows are part of a coordinated energy strategy. A renovation demands adaptability, accurate surveying, and product selection that works within existing constraints while still delivering meaningful performance improvements.

Fairco works across both project types, from full new-build specifications to single-property renovations. Our survey, manufacturing, and installation process is designed to handle the complexities of each, ensuring that what is specified is what is delivered, regardless of the starting point.

Book a free consultation to discuss your project with the Fairco team.