Modern Flat Roof Extension

What is a flat roof extension?

Our modern flat roof extensions make the ideal accompaniment to traditional or modern properties offering contemporary style to harmonise or contrast with the existing structure. Combined with a range of design choices, any look can be achieved, and any style of property can be enhanced with a flat roof extension.

The strongest & warmest flat roof extension available

You can count on a SEH BAC flat roof extension for durability, longevity, and outstanding thermal performance. Depending on the amount of glazing, a modern flat roof extension can keep a lid on energy bills. Able to achieve outstanding U-values as low as 0.14W/m2K, the roof lantern incorporates insulating aluminium sections; delivering the look of a classic orangery without ever having to compromise on present-day efficiency.

Designed to cope with the worst of the weather, it has inherent strength and can span up to 5.8m above slimline bi-fold or sliding doors without costly and unappealing additional support. It also has a pre-manufactured ‘fall’ system to ensure water drains away efficiently.

A range of 'fast-fit' flat roof options for your new extension

Contemporary, ‘edge-to-edge’, flat skylights are a firm favourite with modern developments, offering greater privacy without having to compromise on natural lighting. Whilst lantern roof extensions create an unforgettable statement in heritage, period, and more traditionally styled households in Essex and the Southeast.

With so many designs and finishing touches available, we can work with you to create the flat roof extension that is exactly how you imagine it.

Available in a number of square or rectangular sizes to suit you

Ideal for a new kitchen extension, as well as modernising existing extension spaces, our flat roof extension design process will guide you through each step and make you fully aware of the range of high-quality design choices available.

Personalized in a multitude of alluring colour choices and finishes, for a really contemporary appearance, go one step further with an extended internal plastered soffit system*, a modern overhang on the roof to shelter the doors, and level external flooring options to seamlessly flow from the inside to the outside with the utmost ease and finesse. Perfect for those with 'Grand Designs' in mind, it can also accommodate extra-large roof lights up to 23m².

*Available in small, medium, or large, a soffit is a horizontal architectural feature built lower than the area around it. Its purpose is to conceal light fittings and speakers, it adds stylish character to any extension.