Retrofit your home with Swedish composite windows

Retrofitting is a whole house, complete approach to making homes more energy-efficient, and can help to lower your energy bills and make your home warmer.

According to the Committee on Climate Change, Britain’s existing homes generate around 15% of the UK’s carbon emissions, and with the government’s target for the UK to be net zero by 2050, retrofitting homes is just one of the ways towards achieving this.

Retrofitting is not just renovating your home, but considering the house as a whole and focussing on the fabric of the house including the walls, roof, floors, windows and doors, ventilation, heating efficiency and cooling.

Once you understand the current energy efficiency of your home and which areas need the most consideration, you can work towards improvements to achieve your goal. Every property is unique and therefore there is no ‘one size fits all’ approach.

Does your home need retrofitting?

If you’re looking for an accurate measurement you can pay for an Energy Performance Certificate from an approved assessor –the type required if you’re selling or renting your home. They typically cost anything from £35 to £120. You can find an assessor in your area at:

A blower door test can tell how airtight your home is and thermographic surveys can help to identify any areas of air leakage as well as help to establish how well-insulated your house in.

These measurements are focussed on Deep or Whole House retrofits. However there are many smaller, quicker and more cost effective improvements, such as LED light bulbs, smart plugs and draughtproofing that can help to reduce your energy use. With a considered, pragmatic approach you can assess your own home, and carry out individual retrofits to help to achieve at least some improvement in your energy efficiency.

Trustmark have produced a consumer guide to retrofitting your home here, with a list of their top considerations as:

  • Improve the insulation of the elements of the building fabric (exposed floors, walls, roofs, windows & doors).
  • Improve the air-tightness of the building.
  • Provide or upgrade ventilation to ensure good internal air quality and minimise the risk of condensation.
  • Provide efficient heating and cooling systems with responsive, intelligent or “smart” controls.
  • Provide efficient water heating systems with responsive controls, including systems that use low or zero carbon technologies.
  • Provide efficient fixed lighting with appropriate controls.
  • Provide metering and monitoring systems to promote the efficient use of energy.
  • Provide locally generated renewable electric power systems that use low or zero carbon technologies.


Energy efficient composite windows and doors for retrofitting

All properties lose heat through their windows and doors – typically around 18% through windows. Energy-efficient glazing will help to keep your home warmer and reduce energy bills.

Heat is lost through single glazing at around twice the rate of standard double-glazing, so this should be the first consideration. Energy efficient glazing covers both double and triple glazing – windows with two or more glass panes in a sealed unit.

The benefits of installing energy efficient composite windows are:

  1. A more comfortable home – reducing heat loss through windows means fewer draughts and cold spots
  2. Peace and quiet – energy efficient composite windows reduce the external noise creating a more peaceful environment
  3. Reduced condensationWestcoast Swedish composite windows are manufactured with the latest ‘warm edge’ technology, insulated super spacers and argon gas filling that reduce the chance of condensation.


Energy efficient windows’ construction

Energy efficient windows come in a range of frame materials and styles. The design and material used for the frame and the way the windows are manufactured will affect heat loss.

Westcoast true bonded Swedish composite windows are a unique system consisting of an outer part of powder-coated aluminium,  resistant to harsh weather conditions, bonded to an inner part of wood. The timber element acts as a thermal break, enabling the frame to offer very high levels of insulation. Furthermore, extrusions in the external aluminium frame allow the windows to be fully drained and ventilated, preventing harmful moisture and rot from damaging the internal timber. Find out more about the benefits of Westcoast composite windows for retrofitting:


Energy efficient windows’ U-values

A U-value is a measure of how easily heat passes through a material. Westcoast composite windows have U-values as low as 0.9 W/m2k.


Draught-proofing and ventilation

Draught-proofing your home is one of the cheapest and most effective ways to save energy, and includes blocking up any unwanted gaps that let cold air in and warm air out. Replacing your windows and doors with energy efficient improvements will help to make your home more airtight. However, if you’re increasing the insulation in your home there should be some consideration for controlled ventilation to help reduce condensation and damp. Westcoast composite energy efficient windows can be fitted with Trickle Vents which let in fresh air when needed without creating an uncomfortable draught.

To discuss how Westcoast composite windows can improve your home, contact us to find an approved distributor in your area:

Find out more about replacing your windows and reducing your heating bills below…

Replacing your windows

Reduce your heating bills


For further advice and reading on energy efficiency and retrofitting your home visit:


Retrofit your home with Swedish composite windows
Retrofit your home with Swedish composite windows
Retrofit your home with Swedish composite windows