The Ultimate Collection products from South Lakes Windows Ltd were tested for their energy efficiency using a variety of glass sealed unit configurations. The tests concluded that The Ultimate Collection Bevelled and Ovolo systems achieved similar results and were awarded “C”, “B” and “A” ratings with an Energy index far higher than many of its competitors, surpassing the standards of all current building regulation requirements. Help care for our Planet – Windows with ‘A’ rated glazing!
The Genuine Article
All The Ultimate Collection PVC-u windows and sealed units are manufactured to the highest specifications, this guarantees that the standard for the energy rating you have requested has been met.
The two panes of glass sandwich an inert argon gas that prevents heat transfer. Also all glass seals are modified to stop heat transfer as well as energy efficient features in the frames themselves. The glass itself is also engineered to minimise heat loss.
Double glazed windows manufacturers supply the British Fenestration Rating Council with accurate drawings of the window sections along with details of the type of glass sealed units used.
Computerised simulation tests are then carried out that will assess:
Based on these results all PVC-u double glazing is then certified from an “A” Rating to “G” Rating (“A” being the best possible energy saving performance window).

Modern glass technology offers a range of glass types that together with warm edged spacer bars and argon gas cavity infill, help achieve lower U-values and provide far more energy efficient upvc double glazed windows and doors.
Therefore replacement windows are now energy rated which will keep your heating bills down and help reduce harmful CO2 emissions! Help the Planet – South Lakes Windows Ltd.
You may think a window is a window, no need to complicate matters and the reasons for having windows in your house are simple…
All of the above are true however since the publication of the Governments Building Regulations Part “L” (2006) it is a legal requirement to ensure the windows fitted in your house help to conserve fuel and power and cut down on CO2 emissions. This is achieved by fitting double glazed Energy Saving Tricept Windows.
With carbon emissions high on the global agenda and the cost of fuel rising, we are looking for ways to make our homes more energy efficient.
Numerous household items are now manufactured and installed to these energy requirements and clearly fitting the correct windows is one of the most essential energy saving choices you will make for your home.
Double Glazed Window manufacturers supply the British Fenestration Rating Council with accurate drawings of the window sections along with details of the type of glass sealed units used.
Computerised simulation tests are then carried out that will assess:
Based on these results all windows are then certified from an “A” Rating to “G” Rating (“A” being the best possible energy saving performance double glazed window).
Modern glass technology offers a range of glass types that together with new warm edged spacer bars and argon gas cavity infill, help achieve lower U-values and provide a far more energy efficient double glazing system and consequently help the Planet – South Lakes Windows Ltd
Therefore Tricept UPVC replacement windows are now energy rated which will keep your heating bills down and help reduce harmful CO2 emissions.
Taking advantage of the latest glass and thermal insert technology, Tricept windows were submitted and comfortably achieved “C”,”B” and the industry maximum “A” rated certification. Far higher than many competitors and easily surpassing required building regulations.
Special Offer – South Lakes Windows Ltd will supply “A” rated windows at the same price as “D” rated!
Tricept windows sealed units are manufactured to the highest specification as shown below.
The BFRC confirm that Tricept Energy Windows are 67% more efficient than conventional double glazed PVC-u windows.
A PVCu window can only be tested and given a genuine certified rating based on the complete make up of the window. The test must include the type of glass sealed unit used within the frame given that different units will produce different results.
All PVCu Tricept Windows and sealed units are manufactured and assembled in-house, this guarantees that the standard for the energy rating you have requested has been met.
As manufacturers of an energy efficient product Tricept fully recognise our environmental responsibilities and remain fully committed and vigilant of our duties regarding wastage, recycling and energy efficiency.
Indeed Tricept are the first PVC-u manufacturers (Sudbury site) to be awarded the British Standards BS14001, a certification in recognition of our environmental management systems.
Our Partners
Having established the correct energy saving products it is essential that you choose the right installer.
Our selective network of installers (In this case – South Lakes Windows Ltd) who choose to fit Tricept are all Fensa Registered and work within an agreed code of practice which includes a full understanding of energy efficiency, building regulations and all other Fensa requirements.
We care about our customers, our planet, our environment and indeed the products we install in your home.
We Recycle:
The average UK home will enjoy annual savings on energy bills when fitted with Energy Efficient Tricept Windows.
£461 Energy Savings per household per year!
The average UK home will help reduce the negative impact on our environment when fitted with Tricept Energy Efficient Windows.

CO2 Emissions Saving per household per year

Carbon Saving per household per year
Up to 800 times more thermally efficient than conventional metal reinforcements…
Reinforcing has traditionally been fitted into PVC-u double glazed windows for 2 reasons. Firstly to offer a better fixing for various hardware fittings and secondly to ensure the rigidity of the frame in the direction of high winds.
The graphs below clearly show how the new Ultimate Collection PVC-u thermal inserts more than out perform BS requirements, but also add a completely new advantage in the manufacture of Energy Efficient windows.
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South Lakes Windows Ltd supplies and installs premium quality glazed windows, UPVC and composite doors, conservatories and orangeries across a wide service area covering Lancashire, Cumbria and North Yorkshire.
We work with homeowners in towns and villages across the region, including:
Cumbria: Barrow-in-Furness, Dalton in Furness, Ulverston, Broughton-in-Furness, Penrith, Keswick, Grasmere, Ambleside, Windermere, Coniston, Hawkshead, Kendal, Natland, Staveley, Tebay, Sedbergh, Arnside, Allithwaite, Grange-over-Sands, Cartmel, Lindale, Levens, Milnthorpe, Heversham, Holme, Witherslack, Dent, Cark and Flookburgh, Newby Bridge.
Lancashire: Preston, Lancaster, Garstang, Morecambe, Heysham, Clitheroe, Ribchester, Poulton-le-Fylde.
North Yorkshire & Border Areas: Settle, Ingleton, Kirkby Lonsdale, Burton-in-Kendal, Burton in Lonsdale, Bentham.
We also work throughout the wider South Lakes area and regularly take on projects across the Lake District National Park. If you’re unsure whether we cover your location, just get in touch with our team – we’re always happy to help.