Woodstone Bilbao 32mm Oval Hole Nest Box

Looking for a nest box that lasts longer than a season and actually helps birds thrive? Say hello to the WoodStone® 32mm Oval Hole Nest Box - a sturdy home for House Sparrows, Redstarts, Great Tits, and Tree Sparrows. Designed by birding experts and built to withstand pretty much everything nature (and predators) throw at it, this is the nest box you’ll wish you’d discovered sooner.

Unlike wooden alternatives that can rot or warp over time, this box is made from WoodStone® - a clever mix of concrete and wood fibres that delivers serious durability, insulation, and predator resistance. In short: it keeps the birds safe and snug, season after season.

Why the oval hole matters

The 32mm oval-shaped entrance isn’t just a design quirk. It's a feature birds like House Sparrows and Redstarts actually prefer over traditional round holes. It gives them just the right amount of space, security, and shelter. That’s not opinion - it’s backed by field research across Europe.

Built for birds, tested by nature

This nest box is part of our Vivara Pro range, used by professionals and conservationists alike. It even features a black front that’s often used for numbering boxes during scientific studies - or simply because it looks stylish in the garden. It’s heavy (around 7kg), so we recommend using aluminium nails to hang it safely and reduce damage to trees.

Why choose the WoodStone® 32mm Oval Hole Nest Box from CJ Wildlife?

• Long-lasting: guaranteed for 10 years - won’t rot, split, or fall apart
• Predator-resistant: protects against squirrels, cats, and woodpeckers
• Made from WoodStone®: a durable blend of wood fibres and concrete
• Excellent insulation: keeps temperatures stable inside, improving chick survival
• Expert-approved: developed with leading European birding organisations
• Thoughtful design: 32mm oval hole is ideal for sparrows, tits, and redstarts
• Eco-conscious: made with sustainable materials and built to reduce waste
• Part of the trusted Vivara Pro range, used in professional conservation projects
• Black front is useful for numbering in research and looks great in your garden

At CJ Wildlife, we design our nest boxes in collaboration with ornithologists and conservationists, so you're not just buying a box - you're giving birds a better chance at life. That's the Vivara difference.