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Why Part L matters for your bifold
Part L of the Building Regulations sets the minimum U-value for new and replacement doors in England and Wales at 1.4 W/m²K. Our Versatali bifolds hit 1.2 W/m²K as standard — or 0.8 W/m²K with the triple-glazed option, which is Passivhaus-certified.
The rest of the high street? Bifolds that need glass upgrades to pass building control. Ours pass first time, every time. That’s thanks to a 34 mm polyamide thermal break, triple-gasket weather seals, and steel-reinforced corners that keep the frame square for a 25-year service life.
Engineered for the UK — homeowners, builders and installers
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Slim sightlines
Only 119 mm mid-rail when leaves meet — more glass than almost any rival on the UK market.
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Lightweight alloy
Easier to lift into place during install, lower strain on the structural opening.
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Strong where it counts
Steel-reinforced pivot corners handle sashes up to 1.2 m wide and 2.4 m tall.
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Part L U-values
1.2 W/m²K double-glazed, 0.8 W/m²K triple-glazed — Passivhaus option available.
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Low-profile threshold
Flush threshold option for level access — wheelchair and buggy friendly.
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Any RAL colour
Matt, gloss, textured or dual-colour — no surcharge on standard colours.
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PAS 24 secure
3-star anti-snap cylinder, shoot-bolts top and bottom, anti-lift rollers.
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Easy install
Pre-fitted gaskets and adjustable carriage rollers — square up in minutes.
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10-year guarantee
Frames, hardware and gaskets covered — tested to 25 years of service life.
The Versatali range in real homes
Slim 80 mm frames, triple interlock gaskets, huge glass panels — engineered for UK builds, tested for UK weather. Photography from recent installs.
4.8 m wide, Part L compliant at 1.2 W/m²K. Anthracite Grey frames.
Steel-colour frames with low-profile weathered threshold.
More glass, less frame — the lowest sightlines in the range.
Everything you need to know before you pick a bifold
A bifold door is often the biggest single item of glass in your home. It shapes the way a room feels every day. So it’s worth a few minutes to understand the choices.
How a bifold door works
A set of slim door leaves that fold back on themselves. Each hangs from a top track and slides on hidden rollers. When you push the handle, the leaves concertina tight against the wall. Three leaves go to ~3.5 m, six leaves can reach 6 m+.
Aluminium or uPVC?
We only recommend aluminium. uPVC bifolds need much thicker frames to carry the weight — less light, less modern, and they sag after a few years. Aluminium is stronger by weight, won’t warp in heat or go brittle in cold, and won’t yellow in the sun.
How many leaves?
Three leaves suits 3–3.5 m. Four leaves for 3.5–5 m. Five and six leaves for large rear elevations on 5–6 m extensions. Pick an odd number if you want a “traffic leaf” you can use as a normal day-to-day door.
What is a flush threshold?
A very low aluminium track at the bottom — the floor on each side sits at the same height. Looks amazing and works brilliantly for level access. Both flush and weathered options pass Part M.
Thermal performance
U-value measures heat loss. Part L requires 1.4 W/m²K or better. Ours hit 1.2 W/m²K standard, 0.8 W/m²K on triple glazing — better than many composite front doors.
Security
PAS 24 tested. Shoot-bolts top and bottom on every leaf, hook bolts on the traffic leaf, anti-lift rollers, internal beading, TS007 3-star anti-snap cylinder.
Supply only or supply & fit?
We do both. Supply-only with trade pricing for builders. Supply & fit with our in-house team for homeowners. Same 10-year guarantee either way.
How long does it take?
Standard lead time is 4–6 weeks. Priority service can bring this down to 2–3 weeks. Install day is usually one day on site.
Trusted by homeowners & builders across the UK
“Massive five-leaf bifold across the back of our kitchen extension. Slim frames, smooth runner — the whole rear wall opens out. Fitted in a day. Brilliant team.”
“I supply-only on most of my builds. GWS bifolds are my go-to — packs are clear, deliveries on time, fitting guide is excellent.”
“Six-leaf flush threshold across our garden extension. Triple glazed, 0.8 W/m²K. Warm in winter, easy to slide open in summer.”
Premium hardware, colour-matched to every frame
Multi-point locking, TS007 3-star anti-snap cylinders, stainless-steel running gear, concealed hinges, and a full range of lever, pull and key-operated handles.
Smooth ergonomic and Quadra square-edge — Anthracite, Matt Black, White, Polished Chrome, Satin Silver, Brushed Gold.
Heavy-duty multi-point gearing for traffic leaves and large bifold runs. Six finishes.
Anti-snap TS007 3-star cylinders, hook bolts and shoot-bolts on every leaf as standard.
Hidden when closed, adjustable in three planes for a perfect reveal for life.
Over 200 colours — powder-coated, textured & gloss
Every frame finished to order — matt, gloss, metallic or textured. Dual-colour (different inside / outside) supported on all ranges, no surcharge.
RAL 7016M — most-specified UK colour, modern homes
RAL 9005M — boutique, luxury, Crittall-style
RAL 9910HG — clean Scandinavian feel
RAL 6009 — country & heritage homes
RAL 6005 — barn conversions, rural
RAL 7015 — softer modern grey
DB 703 T — warm, premium textured finish
RAL 7016 Matt T — hides fingerprints, fabulous on country
More ways we transform homes & builds
Your builder can fit them — or we will
Supply-only to trade (trade pricing, full technical pack) or a white-glove install by our in-house team. Your choice at checkout.
