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O360 round window in finished timber interior with garden view
O360

O360 Round Window System

Premium circular windows for timber and CLT construction. Engineered, sourced, and delivered.

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The complete round window solution

Round windows are one of the most distinctive architectural elements you can specify. They are also one of the hardest to source. The curved frame, the reveal lining, the sill detailing. For most builders and architects, it means custom carpentry and coordination headaches.

The O360 changes that. It is a complete, pre-fabricated round window system: the glazing unit, the timber-aluminium frame, and the reveal lining, delivered ready to install into your wall opening. No custom carpentry. No coordination between trades. One order, one delivery.

Manufactured by i2 in Latvia using the same PHI-grade materials and processes as our Smartwin window range.

Diameter range
500mm to 1500mm
Glazing
Triple glazed as standard
Frame
Timber interior, aluminium exterior
Lead time
8 to 10 weeks
Installation
Pre-fabricated reveal lining included
Delivery
Europe and North America
Gallery
O360 round window in finished timber interior with garden view
Round window installed in timber frame wall exterior during construction
Close-up of O360 round window from interior during construction
Timber frame building exterior with O360 round window in gable end
O360 round window installed in gable with dark exterior trim
Interior view of O360 round window installation with airtight membrane
O360 round window unit showing timber frame and triple glazing
FAQ

A round window, also called a circular window, oculus, or bullseye window, is a fixed glazing unit with a circular frame. Round windows are used as architectural focal points in residential and commercial buildings, particularly in gable ends, stairwells, and feature walls.

Round windows require specialized manufacturing for the curved frame, precise glazing, and custom reveal lining. Most window companies focus on standard rectangular products, making round windows a niche product with limited availability. The O360 solves this by packaging everything into a single, ready-to-install system.

The O360 is available in diameters from 500mm to 1500mm. Custom sizes outside this range can be quoted on request.

The O360 is delivered as a complete system: the round glazing unit with timber-aluminium frame, plus a pre-fabricated reveal lining that fits into the wall opening. This eliminates the need for custom carpentry around the curved opening.

Yes. The O360 works in both new builds and renovations. The reveal depth is configurable to match your wall thickness.

Green Glass Factory delivers across Europe and North America. Typical lead time is 8 to 10 weeks from order confirmation.

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