French doors are a pair of glazed doors that open from the centre.
Alitherm Heritage French Door profiles feature the system’s signature slim sightlines and elegant lines that complement Smarts’ existing Alitherm Heritage Window and mimic those of steel doors.
The system has all the advantages of modern aluminium profiles that feature polyamide thermal breaks, allowing the system to achieve a U-value of 1.5 W/m2K when installed with a suitable sealed unit.
Also available as a Single Door.
Powder coated in any RAL colour
You can choose to have these doors in any RAL colour and you can also specify having a dual colour allowing for a colour outside and perhaps a white finish inside.
Dual-colour is a popular choice and reflects traditional frames where the outside is painted a different colour to the interior, allowing for greater flexibility in interior decorating.
Stock standard colours are as follows:
Note: paint surcharge applies for non-standard RAL colour
| Hero Lever Handles |
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![]() Six colours available Black • Chrome • Grey • Polished Gold • Satin Smooth • White |
| Art Deco Lever Handle Options |
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We are experts at window and door replacements, along with the complete build of garden rooms, extensions, verandas, sky rooms and conservatories. Let us know what you’re after and we will arrange a site visit at a convenient time for you, discuss your ideals and then give you a full, free, no-obligation quote for everything involved.
Got a question? Just ask – our advice is free.
French doors are a pair of glazed doors that open from the centre.
Yes. Modern French doors include multi-point locks and toughened glazing.
Most systems can be configured to open either way.
Yes. Matching glazed side panels are available.
Modern double glazing and insulated frames help keep your home warm.
uPVC doors are durable, low-maintenance entrance or rear doors that offer excellent insulation and security.
Yes. Modern uPVC doors are insulated to help reduce heat loss.
Quality uPVC doors can last 20–30 years or more with proper care.
Yes. Multi-point locking systems and reinforced frames provide excellent security.
White, Anthracite Grey, Black, Chartwell Green, and woodgrain finishes are popular choices.
Yes. uPVC is a popular low-maintenance replacement.
Yes. Both materials are popular choices depending on style and budget.
A multi-point lock secures the door at several points for improved security.
Yes. Laminated glass improves security and safety.
Yes. Privacy glazing is available in many designs.
Yes. Matching designs create a consistent appearance.
Yes. Hardware is available in many colours and finishes.
Usually not, unless your property is listed or in a conservation area.
KRB does not offer finance but can help with a stage payment plan.
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