Extension bifold doors and sliding doors, fitted by glazing specialists

Windows and doors are where AA Window Services started, so this is the part of an extension we know inside out. We'll help you weigh up extension bifold doors against extension sliding doors based on how you'll use the room, how much wall you want to open up and where the light comes from.

Everything is made bespoke to order and fitted by our own team, so the glazing on your extension is held to the same standard as the build itself.

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modern black bi-folding doors for hup! modular extensions
extension glass window panels leading to garden

House extension windows that bring the light in

Good house extension windows do more than fill a gap in the wall. Placed well, they light the room from morning to evening and make a new space feel like part of the house.

We offer tilt and turn, flush casement and sliding sash styles alongside contemporary designs, so your home extension glazing can suit a new build in Portsmouth or a period property in Chichester just as easily.

modern glass pane windows in black
Home extension windows in white

Extension doors that open up the garden

Bifold doors fold right back to open an entire wall, which works brilliantly for kitchen extensions that spill out onto a patio in summer. Sliding doors keep large panes of glass in place all year, giving wide views even when they're closed. French doors are another option where space is tighter.

Whichever you choose, it's fitted to the same thermal standard as the rest of your hup! extension.

Explore our gallery for inspiration and see how different door and glazing options can transform a space.

black frame bi-folding glass doors
white extension windows and doors
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Any questions?

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Who fits the windows and doors on a hup! extension?

AA Window Services fits all the glazing itself. Windows and doors are where the business started over thirty years ago, so you get specialist fitting from the same team that builds your extension.

Should I choose bifold or sliding doors for my extension?

Bifold doors suit rooms where you want to open a whole wall onto the garden in summer. Sliding doors keep larger glass panels in place for clearer views all year. We'll help you decide based on the size of the opening and how you plan to use the room.

Can the windows on my extension match my existing home?

Yes. We offer tilt and turn, flush casement and sliding sash windows in a range of colours and finishes, so the glazing on your extension can suit a modern home or a period property equally well.
Still need help?

Visit our advice hub to find answers to questions, useful tips, and more

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The better way to build with hup!

hup! is a highly energy efficient way to extend your home, creating bright, comfortable living spaces with minimal disruption. You can build almost any style of house extension or transform an old conservatory up to five times faster than with traditional building methods, and AA Window Services handles the whole project, from the first design through to completion.

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We are proud to be part of the hup! Partner Network in Portsmouth

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