What energy-efficiency level should I be looking for?
Bi-fold doors tend to be measured on U-values rather than an energy rating. Generally, PVC and timber are more energy efficient than aluminium, but with modern designs, the lower the U-value the better the efficiency. Part L of current Building Regulations specify that for a refurbishment or extension to an existing dwelling, new glazing must achieve a U-value of 1.8W/m²K or lower.
Will bi-folds add value to a property?
They might not necessarily add value to a property but they will definitely make it more desirable. Bi-fold doors are now very much an on-trend addition to a home and can transform a space by improving the link to the outside space and improving the levels of natural light, when both open and closed, making a room look and feel larger.
What sort of maintenance do bi-folds require?
If you’re looking for a design that requires little maintenance, aluminium is the best option and requires almost no upkeep, while timber styles may need to be regularly treated to protect the wood. With all styles, the track needs to be clear of dirt and debris and you can use silicone spray to lubricate the runner and lock.