Jessica’s choice: bifold doors
Looking to create a seamless connection between inside and out? Choose bifolds!
Unlike sliding or french doors, bifolding designs stack neatly out of the way, providing gloriously open access to the garden – and an expansive feeling inside. Here’s what to think about first…
Ideal size
The dimensions of your opening will determine the number of doors – try to go for as few as possible for clear views. Odd numbers look best – three or five are the most popular. If everyday access is required, make sure there is a single lead door that can be opened outward.
Best materials
UPVC is still the best budget-friendly choice, now available in black or dark grey finishes. But UPVC isn’t as strong as aluminium or wood, so the frames will be thicker to enable them to achieve the desirable strength. Wood frames offer style, are a good fit with period homes, but require more maintenance, and there can be issues with warping. Whatever you choose, make sure they come with a decent guarantee of at least 10 years.
Weatherproofing
Large glass expanses can feel chilly compared to a solid wall so decent thermal performance is crucial. Look for the lowest U-values, which indicates the heat lost in watts per square metre. To comply with building regulations, bifold doors must be 1.8W/(m2k) for replacements, or 2.0W/(m2k) in new builds and extensions, but there’s nothing to stop you aiming lower – triple glazing go down to 1.3W. Ensure they pass the weathertightness test (BS 6375 Part 1).
Opening and closing
This is where you can judge door quality. Bifolds are mounted on tracks and should slide, fold and stack smoothly and with minimal force. Visit a showroom to test and compare. Flush fitting tracks with recesses into the floor reduce trip hazards, and look slick, but beware that they can make it harder to achieve a watertight fit.
Safety and security
As a large access point into your home, bifolds must conform to current security standards and the lead door must have a multi-point locking system. For extra peace of mind, invest in a lock featuring an anti-pick/drill cylinder that conforms to Police ‘Preferred by Design’ security standards. If you have small children, request finger-safe gaskets to prevent doors slamming shut on tiny hands…