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ENERGY EFFICIENCY & U-VALUE PERFORMANCE
At Best Deal Windows, we proudly supply and install window and door systems manufactured with the highest industry standards. Partnering with Selecta Systems, we offer Eurolook70 profiles combined with Thermaglas sealed units to deliver exceptional thermal efficiency and compliance with current UK Building Regulations.
Our multi-chambered window and door profiles, in combination with 40mm triple glazing (TGU) or 28mm double glazing (DGU), can achieve U-values as low as 0.8 W/(m²K). These performance levels help homeowners reduce energy bills, improve comfort, and meet sustainability targets.
DOCUMENT L — Future Homes Standard Compliance
Our products fully comply with Document L, ensuring energy efficiency standards are met for both new and existing homes.
New homes now require:
✓ Windows: U-value ≤ 1.2 W/(m²K)
✓ Doors: U-value ≤ 1.2 W/(m²K)
For existing homes:
✓ Replacement windows must meet at least 1.4 W/(m²K)
✓ Replacement doors (with >60% glass) must also meet at least 1.4 W/(m²K)
DOCUMENT F — Ventilation Requirements
As of June 2022, homes must have background ventilators with trickle vents unless other adequate systems exist.
✓ Kitchens/Living Rooms: 8000mm² (2 EA)
✓ Bathrooms/Toilets: 4000mm² (1 EA)
Stricter requirements may apply where natural ventilation is limited.
2022 BUILDING REGULATION CHANGES
As of 15 June 2022, updates to Part L and F require:
-
Lower U-value limits for both new and existing homes
-
Mandatory background ventilation
-
Full compliance with carbon efficiency targets
SUPPORTING THE NET ZERO 2050 GOAL
Best Deal Windows is committed to the UK government's goal of achieving net zero carbon emissions by 2050. By offering energy-efficient windows and doors, we help reduce overall carbon impact, support sustainable building practices, and future-proof properties against tightening regulations.
WHY CHOOSE US?
✓ A-rated systems with U-values as low as 0.8
✓ Fully compliant with Document L & F
✓ Expert installation with technical support
✓ Ideal for new builds and renovations
✓ Environmentally responsible solutions
📞 Contact us today to discuss your project requirements or request technical documentation.
At Best Deal Windows, we proudly supply and install window and door systems manufactured with the highest industry standards. Partnering with Selecta Systems, we offer Eurolook70 profiles combined with Thermaglas sealed units to deliver exceptional thermal efficiency and compliance with current UK Building Regulations. Our multi-chambered window and door profiles, in combination with 40mm triple glazing (TGU) or 28mm double glazing (DGU), can achieve U-values as low as 0.8 W/(m²K). These performance levels help homeowners reduce energy bills, improve comfort, and meet sustainability targets. [...]DOCUMENT L — Future Homes Standard ComplianceOur products fully comply with Document L, ensuring energy efficiency standards are met for both new and existing homes.New homes now require:
Windows: U-value ≤ 1.2 W/(m²K)
Doors: U-value ≤ 1.2 W/(m²K)
For existing homes:
Replacement windows must meet at least 1.4 W/(m²K)
Replacement doors (with >60% glass) must also meet at least 1.4 W/(m²K)
DOCUMENT F — Ventilation RequirementsAll replacement and new-build installations follow Document F, which requires background ventilation to ensure healthy air flow:
Trickle vents must be fitted regardless of whether existing windows had vents
Minimum vent sizes per room type:
Kitchens/Living Rooms: 8000mm² (2 EA)
Bathrooms (with or without toilet): 4000mm² (2 EA)
For new homes with natural ventilation, stricter requirements apply based on layout and air tightness.--- 2022 BUILDING REGULATION CHANGES As of 15 June 2022, updates to Part L and F require: - Lower U-value limits for both new and existing homes - Mandatory background ventilation - Full compliance with carbon efficiency targets Our windows and doors are manufactured in line with these updated standards, helping customers stay compliant while reducing energy use. --- SUPPORTING THE NET ZERO 2050 GOAL Best Deal Windows is committed to the UK government’s goal of achieving net zero carbon emissions by 2050. By offering energy-efficient windows and doors, we help reduce overall carbon impact, support sustainable building practices, and future-proof properties against tightening regulations. --- WHY CHOOSE US? ✔ A-rated systems with U-values as low as 0.8 ✔ Fully compliant with Document L & F ✔ Expert installation with technical support ✔ Ideal for new builds and renovations ✔ Environmentally responsible solutions Contact us today to discuss your project requirements or request technical documentation.
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PULL-TO-OPEN WINDOWS OR DOORS









Pull-to-Open Sliding Windows
They are used in four-corner windows or doors. Normal door and window systems are used and they are operated as simple, single sliding slider doors and windows with their special accessory. Since a rubber gasket is used as in standard PVC windows and locking is ensured at many points with the espagnolette surrounding all around the sash, isolation values are perfect. The joinery is divided by the mullion profile in the vertical part and half is implemented as mobile sash and the other half as fixed pane. In the frame of pull-to-open sliders, half of the joinery should certainly be implemented as fixed. The movable sash is driven onto the fixed part to ensure that it is opened. It can be implemented as one movable sash and one fixed pane and it can also be implemented as two movable sashes, two fixed panes on right and left sides in the frame of wider joineries. In the frame of two movable sash applications, a sash adaptor profile is used in the place where the sashes meet in the middle as with the double sash opening windows. There are handles in both sashes and the passive sash to which the sash adaptor profile is connected should be the one that is closed earlier and opened later. One of the sashes moves to the right the other one moves to the left While the sashes are in closed position, it is not understood which one is active and which one is passive sash. Since the sashes are moved on special aluminum rails added and connected to the upper and lower horizontal parts of the frame, an opening of around 8 cm is formed between the opened sash and frame, thus potential cleaning problems are eliminated thanks to this gap. Pull-to-Open Sliding Windows cannot be manufactured smaller than certain sizes. The sash dimensions should be large to ensure more smoot operation of the system. Since the carrying mechanism with different weights that operate perfectly according to the sash size magnitude and specifications of the panes are used, it has the feature of operating more properly in larger sizes. Since it operates in large sizes, it is controlled with a large lever that is peculiar to itself. For smaller sizes, the risk to cause problems with respect to convenience of operation is increased as the sash becomes lighter. Therefore, the Pull-to-Open Sliding Windows are more frequently used in doors in actuality. Pull-to-Open Windows are used in three different modes depending on their operative functions.
Manual Pull-to-Open Sliding Window
When it is closed, depending on the type of opening [to the left-right], the lever on one of the vertical parts of the sash is in the vertically downwards position. When you turn the lever to turn it to the horizontal position parallel to the ground, the sash will let itself go from the upper part and switch to transom position. This is the position in which ventilation is performed. When you continue to turn the lever and it reaches the vertically upwards position, you will see that the sash is released also from the lower horizontal part and is distanced away from the frame approaching you. It means that the sash has been opened and the load has been exerted on carrying mechanism. By pushing the vertically upwards lever to the right or left [dependingon the opening], it is ensured that the sash slides on rails and the sash is opened until it touches the stopper latch. Never ever turn the lever when the sash is in the open position. When you would like to close your Pull-to-Open Sliding Door or Window, pull the sash by the vertically upwards position and drag it until it reaches the sash gap. When the sash is in front of the sash gap, the lower horizontal part will pull itself towards the frame. With the help of your other hand, push the sash towards the frame, after making sure that it is secured in place, turn the lever by 180° to ensure that it is locked. In the frame of double sash pull-to-open sashes, both sashes are used in the same way without forgetting the rule that 'the passive sash should be closed earlier and opened later than the other one'.
Semi-Automatic Pull-to-Open Slider
They are opened in the same way as the manual pull-to-open sliders. The only difference is in the way they are closed. When you would like to close your semi-automatic pull-to-open sliding door or window, pull the sash by the vertically upwards position and drag it until it reaches the sash gap. When the sash is in front of the sash gap, the lower horizontal part will pull itself towards the frame. This is the transom position where ventilation will be enabled. The sash may stay at the same position while it is being opened and closed. Without the need for help from your other hand, push the sash towards the frame with the lever gripped. After making sure that the sash is secured in place, enable the locking action turning the lever by 180o. In the frame of Double sash Semi-Automatic Pull-to-Open sashes, both sashes are used in the same fashion without forgetting the rule that 'the passive sash should be closed earlier and opened later than the other one'.
Fully Automatic Pull-to-Open Slider
They are opened in the same way as the manual or semi-automatic pull-to-open sliders. When you would like to close your Fully Automatic Pull-to-Open Sliding Door or Window, pull the sash by the vertically upwards position and drag it until it reaches the sash gap. When the sash is in front of the sash gap, the lower horizontal part will pull itself towards the frame. This is the transom position where ventilation will be enabled. The sash may stay at the same position while it is being opened and closed. Start to turn the lever of the sash that remains in the transom position. When you continue to turn the lever without pushing the sash to the frame without needing any help from your other hand and having grapped the lever, you will see that the sash automatically approaches to the frame and the lever completes its 180° rotation to switch to downwards position, the sash has been settled automatically in its slot In the frame and It has become automatically locked.