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Composite doors

A composite door is made from multiple different materials that work together to deliver increased security, strength and thermal efficiency. They’re ideal for clients looking for a low-maintenance alternative to a traditional timber door.

We make both GRP (glass reinforced plastic) and thermoplastic composite doors. Each of these solutions has its benefits, so we’ve created a simple guide to help you recommend the best solution every time. Of course, if you’d like further advice, please feel free to give our team a call.

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Windows

We can design virtually any frame for any installation, with an extensive range of styles, colours and opening features…

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Conservatories

Increase your product offering with beautifully crafted conservatories from Sierra. Discover our complete design to delivery service…

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About Us

We’ve been manufacturing windows from our factory in Devon since 1976, and we’ve earned a reputation for delivering on our promises...

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