Beautiful Oak, Hardwood & Aluminium Conservatories

Enhancing your home, and your lifestyle.

We provide a free, no-obligation quotation, 3D visuals, and expert support through any planning issues. Every installation includes a 10-year guarantee and full after-sales care.

While Hallmark Glazed Extensions are specialists in Seasoned Oak Conservatories, we also offer premium frame alternatives in Hardwood and Aluminium, giving you a full choice of materials to suit your design style and lifestyle needs.

If you’re thinking about adding a conservatory to your home, it’s important to make the right design choices so it complements your property, enhances everyday living, and stands the test of time.

Choose the right conservatory for you and your home

Understand how climate affects year-round use

Decide which frame material (Oak, Hardwood or Aluminium) is best for your property

Navigate extension pricing structures with clarity

Learn if planning or building permissions are required

Get to grips with legal requirements for Listed Buildings

Plan the right lighting for comfort and usability

With over 30 years of experience, our designers have worked on every type of home imaginable and have specialist knowledge of Listed Buildings.

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Cool & Comfortable in the summer

Warm & Cosy in the winter

Use our FREE Buyer’s Guide to help you:

...And Much more!

Download FREE Buyers Guide

Watch our video

Your FREE Buyer’s Guide will give you the confidence and clarity to make a well-informed decision and get the conservatory that’s perfect for your home, taste, and budget.

What Our Clients Say

"It’s added a wow-factor to our home. The light and space is just incredible."

— Mr. Hook, Surrey

"The build quality is second to none. Our oak extension has transformed how we live."

— Mrs. Gray, Hampshire

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Our talented team of designers is passionate about creativity and looks forward to inspiring you with fresh ideas and innovative design solutions.

Book A Design Consultation

15 Minute Consultation - Paul FitzGerald

Book a free Telephone Design Consultation with our Head Designer, Paul, to discuss your plans for a new glazed extension. He will answer any initial questions you may have before booking a free home consultation meeting with a member of our experienced design team.