TheImprover - Blog

Is 1.2 the New Standard? Future-Proofing Your Home for 2026 Building Regs

Sun, 15 Mar 2026 17:41:00 +0000

For years, "Double Glazing" was the only term homeowners needed to know. But as we move through 2026, the conversation has shifted. With the UK's tightening of Part L Building Regulations, the focus has moved from "how many panes of glass?" to "how much heat is actually staying inside?"

At Heronhurst, we’ve seen the industry evolve over 40 years, and the current shift toward 0.8 to 1.2 U-values is the most significant yet. If you are planning a renovation in South Wales this year, here is why you should be looking at the "thermal math" before you look at the price tag.

The "U-Value" Reality Check

In simple terms, a U-value measures heat loss. The lower the number, the better the insulation.

The 2026 Benchmark: Modern regulations now push for replacement windows to achieve 1.4 W/m²K or better, with new builds often requiring 1.2 W/m²K.
The Heronhurst Standard: We don't believe in just "scraping by" the minimum requirements. By utilizing systems like Sheerline Aluminium (reaching 1.1 with triple glazing) or our Timberstyle Flush Casements, we are helping Abergavenny homeowners reach performance levels that were considered "NASA-grade" just a decade ago.

Why "Just Meeting Regs" Isn't Enough Anymore

When you invest in new windows, you are likely looking at a 25 to 35-year lifespan. Buying a window that barely meets 2026 standards today means your home could be "thermally obsolete" by 2035.

Future-proofing your home isn't just about saving on energy bills (though that is a massive perk); it’s about property value. In 2026, savvy buyers are checking EPC (Energy Performance Certificate) ratings before they even step through the front door. A home fitted with high-performance 0.8 U-value glazing is a much more attractive asset than one with standard "off-the-shelf" units.

Performance Meets Personality

The best part of 2026 technology? You no longer have to choose between a "warm home" and a "beautiful home." Whether it’s the slim, architectural sightlines of our Cortizo sliders or the heritage-correct detail of Roseview Ultimate Rose sash windows, our range proves that high-tech insulation can be invisible.

Links

Timberstyle Flush Casements

Cortizo Aluminium Sliders

Roseview Ultimate Rose

Should I choose a PVC, Aluminium or Composite Door for my home?

Tue, 17 Feb 2026 15:48:00 +0000

Choosing between a PVC (uPVC), aluminium, or composite door depends on your priorities for security, insulation, appearance, maintenance, and budget. Each material performs well when correctly specified and professionally installed, but they suit different needs.

PVC (uPVC) doors are a popular choice for value and everyday practicality. They typically offer good thermal performance and are easy to clean, making them well-suited to busy households. Modern uPVC doors can look smart, but the material can feel less premium than other options, and very dark colours may be more prone to visible expansion and contraction in strong sunlight. If budget and low maintenance are key, uPVC is often the most cost-effective route.

Aluminium doors are known for strength, slim sightlines, and a contemporary finish. The material is rigid, which helps with long-term stability and allows for clean, modern designs. Quality aluminium systems include thermal breaks to reduce heat loss, but overall insulation can vary significantly by product, so it’s worth checking the stated U-values and configuration. Aluminium is also highly durable and resistant to warping, making it a strong option for exposed entrances or a modern exterior style.

Composite doors are designed to combine the benefits of multiple materials, often using a solid core with a durable outer skin. They’re widely chosen for their strong security feel, excellent insulation, and a more traditional “timber-like” appearance without the same level of upkeep as real wood. Composite doors can be a higher upfront investment, but they are often valued for their premium look, stiffness, and overall performance.

When comparing options, focus on the full door set rather than the slab alone. Look for a robust multi-point locking system, a quality cylinder (ideally anti-snap), secure hinges, and well-engineered weather seals. Ask about the door’s thermal performance, guarantees, and what’s included in the installation. The best material for your home is the one that matches your style preferences and delivers the right balance of security, efficiency, durability, and cost for your location and usage.

PVC Doors from Heronhurst Window and Door Studio Abergavenny

Aluminium Doors from Heronhurst Window and Door Studio Abergavenny

Composite Doors from Heronhurst Window and Door Studio Abergavenny

Does a door on a flat and isn’t shared and opens to the outside need to be a fire door in the UK?

Thu, 22 Jan 2026 12:36:00 +0000

In the UK, a flat entrance door that is not shared and opens directly to the outside (e.g., onto a street, a private garden, or an open-air balcony) typically does not need to be a fire-rated door.
Fire doors are primarily required to protect shared internal escape routes (like communal corridors and stairwells) by preventing fire from spreading between individual dwellings and these common areas.

Key Details:

Direct External Access: If your door leads directly to the open air and does not connect to any enclosed communal spaces, it is usually classified as a "final exit" rather than a fire door.

Compartmentation: Fire doors are used for "compartmentation" to trap fire inside a room or flat. When a door opens outside, the risk of smoke or fire trapping other residents in an enclosed hallway is removed.

Building Regulations: Under Approved Document B, fire resistance is generally only mandated for doors separating a flat from an internal common area.

Exceptions:

Proximity to Other Exits: If the door is very close to another flat’s exit or a shared external fire escape, a fire-rated door might still be required to prevent a fire in your flat from blocking someone else's only way out.

Fire Risk Assessment: Your specific building's Fire Risk Assessment (FRA) might recommend a fire door if there are unique risks, such as combustible cladding nearby.

Always check and confirm with an authorised Building Inspector, who's guidance supersedes our general, non-case specific advice

Pilkington discontinue Flemish Textured Privacy Glazing

Thu, 08 Jan 2026 08:16:00 +0000

Pilkington Flemish glass, a popular textured privacy glass, has been discontinued by Pilkington UK as of late 2025, with production ceased and remaining stock being sold off without replenishment, meaning homeowners needing replacements should act fast to find available stock or explore similar alternatives like Stippolyte or Cotswold glass

Key Points:

Official Discontinuation: Pilkington officially withdrew Flemish glass from their Texture range in late 2025.

Limited Stock: While some suppliers might still have old stock, it's limited and won't be restocked.

What it Means for You: If you have Flemish glass and need a replacement (for breakage or misting), you'll need to find remaining stock quickly or choose a different pattern

Review the up to date range of Pilkington Textured Glazing options

Replacement options for Box Sash Windows

Tue, 07 Oct 2025 11:56:00 +0000

There are several replacement options available for box sash windows, each offering different benefits in terms of energy efficiency, aesthetics, and maintenance requirements.

Double Glazed Sash Windows: These maintain the traditional appearance while providing better insulation and reduced noise compared to single glazing.
uPVC Sash Windows: A modern alternative that mimics the look of wood but requires less maintenance and offers good durability and thermal performance.
Timber Sash Windows: Ideal for period properties and conservation areas, these windows use high-quality timber and can be made to match the original design.
Sash Window Conversions: Existing box sash windows can sometimes be upgraded by installing double glazing or draught-proofing systems, preserving the original frames.
Casement Windows: As an alternative to sash windows, casement styles offer easy operation and high energy efficiency, though they differ in appearance from traditional sash designs.

When choosing a replacement, consider factors such as property style, local regulations, budget, and desired performance features.

For many people living in homes where the original windows were sliding Box Sash, re-instating sash is the only option they wish

Box sash windows, also known as sash windows, have a rich history dating back to the 17th century in England. Their innovative design, featuring moveable panels known as sashes, allowed for better ventilation and light control within buildings. The mechanism typically involves counterweights housed within a box frame, enabling the smooth vertical movement of the window sashes.

These windows became a hallmark of Georgian and Victorian architecture, admired for their elegance and practicality. Over time, advances in glass production and joinery improved their functionality and durability. Today, box sash windows remain popular in period property restorations and new builds seeking a classic aesthetic, blending traditional craftsmanship with modern materials for enhanced energy efficiency and security.

Box sash windows remain popular for several reasons. Their classic design complements both traditional and modern architecture, adding character and elegance to a property. These windows are known for their effective ventilation, as both sashes can be moved to control airflow. Additionally, box sash windows are valued for their energy efficiency, especially when fitted with modern glazing and insulation techniques. Their durability, ease of maintenance, and the ability to repair individual components also contribute to their ongoing appeal. Many homeowners appreciate the way box sash windows preserve the historical integrity of older buildings while offering contemporary performance and comfort.

Box sash windows are well-regarded for their ventilation capabilities. Their unique design allows both the top and bottom sashes to be opened, enabling warm air to escape from the top while cooler air enters from the bottom. This effective airflow can help maintain a comfortable indoor environment. Additionally, the level of ventilation can be easily adjusted by altering the position of the sashes to suit different needs and weather conditions.

The cost to replace and install box sash windows in the UK can vary depending on several factors, including the size of the windows, the materials chosen, the level of customization, and the company carrying out the work. On average, the price per window, including installation, typically ranges from £1,000 to £2,500.

Additional costs may arise if there are structural repairs, removal of old windows, or upgrades such as double glazing or specialist finishes. It is recommended to obtain multiple quotes from reputable installers to ensure an accurate estimate tailored to your property and requirements.

Take a look at some Sliding Box Sash options

Legacy Box Sash Windows

Roseview Box Sash Windows

Also for typical pricing on our Sash Windows, take a look at some Window Replacement Pricing Guides

Typical Pricing for Replacement Windows and Doors

What is a Composite Door and how is it different to a PVC Door?

Fri, 22 Aug 2025 08:43:00 +0000

A composite door is made from a combination of materials such as wood, insulating foam, and glass-reinforced plastic (GRP), designed to offer strength, durability, and improved security. These doors are engineered to overcome common issues found in single-material doors, such as warping or weather damage.

In contrast, a PVC (polyvinyl chloride) door is typically made from a single extruded plastic material. While PVC doors are lightweight, low-maintenance, and cost-effective, they may not offer the same level of strength or insulation as composite doors. Composite doors are also known for their realistic wood-like appearance and enhanced thermal efficiency compared to standard PVC doors.

However, a well made Engineered PVC Door is often of comparable insulation, strength and can offer great looks when designed right and made well

Heronhurst of Abergavenny are well known installers of Windows and Doors, and offer a range of both Composite and Engineered PVC Doors, so may be a worth a visit as they can give independent advice on which is best for you and your home

Visit Heronhurst Window and Door Studio of Abergavenny

Who are the leading Composite Door brands in the UK?

Tue, 12 Aug 2025 11:09:00 +0000

Some of the leading composite door brands in the UK include Solidor, Rockdoor, Endurance Doors, Door-Stop International, and Hallmark Panels

These manufacturers are known for offering high-quality, secure, and energy-efficient composite doors with a variety of styles and finishes. Many of these brands also provide advanced locking mechanisms and a wide range of customization options for both residential and commercial properties

Which is better, Solid Core or Foam Filled?

Solid core doors are constructed with a sturdy interior, usually made from wood or a wood composite, which provides excellent strength, durability, and sound insulation. These doors tend to feel heavier and are often preferred for their robust construction and greater resistance to impact.

Foam filled composite doors, on the other hand, have a core composed of insulating foam. This design offers superior thermal efficiency, helping to keep indoor temperatures stable and potentially lowering energy costs. They are generally lighter than solid core doors and often feature a tough outer layer that mimics the appearance of wood or other materials.

The choice between the two depends on your priorities. If you value maximum strength, sound reduction, and a traditional feel, a solid core door may be better. If energy efficiency and lower weight are more important, a foam filled composite door could be the preferred option.

Do Composite Door Colours Fade?

Composite door colours are designed to be long-lasting and resistant to fading. These doors are manufactured using advanced materials and techniques, often incorporating a durable outer layer, such as a GRP (Glass Reinforced Plastic) skin, which helps protect against UV rays and weather exposure. While composite doors generally retain their colour well, some gradual fading may occur over many years if the door is exposed to direct sunlight for prolonged periods. Regular cleaning and occasional maintenance can help preserve the appearance and ensure the colour stays vibrant.

Where can I buy Composite Doors in South Wales?

You can purchase composite doors in South Wales from a variety of suppliers, including local door and window specialists, Heronhurst Window and Door Studio Abergavenny

Many companies offer a wide selection of styles, colors, and finishes to suit different preferences and budgets. It is advisable to visit showrooms in your area to see the doors in person and discuss installation options with professionals.

Additionally, you can request quotes online from reputable businesses that serve South Wales, ensuring that you compare products and services before making a decision.

When choosing your supplier, an independent retailer like Heronhurst Window and Door Studio Abergavenny are often the best choice, because they offer experienced advise across a range of leading brands of Composite Door, so not just focused on one or two systems, they can genuinely give good advise

They also have a Studio Showroom you can visit to try the doors, and even design in 3D on their large screens while you are there

You can find out more on their website

Visit the Heronhurst Window and Door Studio Abergavenny website

Direct links to some of the leading brands of Composite Doors mentioned in the article include

Solidor

DoorStop

Can smart glass in windows really help to keep your house cooler?

Mon, 30 Jun 2025 06:57:00 +0000

Smart glass in windows can help keep your house cooler by adjusting the amount of sunlight and heat that enters your home. These windows use special technology to change their tint or transparency, allowing less solar heat to pass through during hot days. As a result, the interior remains more comfortable, and the need for air conditioning is reduced. This can lead to energy savings and a more consistent indoor temperature.

How much cooler does my room become?

Smart glass can help reduce the amount of heat entering your room by blocking or reflecting sunlight, which can result in a cooler indoor environment. In the UK, the effectiveness depends on factors such as the type of smart glass, the orientation of your windows, and the level of sunlight your room receives. On average, smart glass may reduce indoor temperatures by several degrees during sunny periods, making your room noticeably cooler and more comfortable. Additionally, it can help lower air conditioning costs and improve energy efficiency.

Find out more about Smart Glass for your Windows and Doors at one of our partner website

Smart Solar Glass keeps you cooler in summer

Replacing Windows within a Conservation Area in South Wales

Thu, 19 Jun 2025 10:35:00 +0000

When replacing windows within a Conservation Area in South Wales, it is important to consider both the appearance and materials used, as these areas are protected due to their special architectural or historic interest. Planning permission may be required, especially if the new windows differ in style, material, or color from the originals.

Generally, it is encouraged to match the original window design as closely as possible, using similar materials. Double glazing may be allowed if it does not alter the external appearance significantly. Before proceeding, it is advisable to consult with the local planning authority to understand the specific requirements and obtain necessary permissions.

Failure to comply with conservation regulations can result in enforcement action, so careful planning and adherence to guidelines are essential.

What is the difference between Astragal Bars and Georgian Bars on Windows?

Wed, 18 Jun 2025 07:50:00 +0000

Astragal bars and Georgian bars are both decorative features used on windows to create the appearance of multiple smaller panes within a single larger pane of glass. However, they differ in construction and visual effect.

Astragal bars are physical bars that are fixed on both the interior and exterior surfaces of the glass. They divide the window into separate sections, and often, each section contains its own individual pane of glass. This creates an authentic, traditional look and adds depth to the window.

Georgian bars, on the other hand, are generally decorative strips fitted either between the panes of a double-glazed unit or applied to the surface of the glass. Unlike astragal bars, they do not divide the glass into separate panes. Instead, they give the impression of smaller panes while maintaining a single sheet of glass, which can make cleaning easier and often provides better energy efficiency.

In summary, astragal bars involve real divisions and typically more traditional craftsmanship, while Georgian bars are mainly for visual effect and are integrated into modern glazing systems.