How to Build an Insect House from Tubes for Wild Bees

It looked like nothing more than a bundle of tidy tubes tucked into a tin, with a small roof perched above it. I assumed it was decorative until the first wild bee, its abdomen dusty with pollen, darted inside and back out at midday. The image stayed with me because it turned something ordinary into something alive: as quiet as a breath, yet suddenly buzzing with purpose. A gentle revolution was taking place there.

Why tubes genuinely attract bees

Wild bees are not looking for a palace. They need a dry, sheltered, warm tunnel with an opening of the right size. Tubes provide a straightforward answer to this ancient need, which awakens wherever sunlight reaches the garden. An insect house made from tubes closely recreates nesting places that have become scarce in nature: hollow stems, boreholes in dead wood and small cavities in clay.

One late-summer afternoon at the edge of an allotment site, a bundle of reed tubes hung from a fence beside lavender and thyme. Children counted the visits of a reddish-brown mason bee and recorded 27 landings in ten minutes. It was no laboratory study, but it gave a clear rhythm of life. This is how a connection develops: in the comings and goings of one bee, you can watch the day's story unfold.

The biology is straightforward. Tubes with diameters of 3 to 9 millimetres accommodate the range of native species, while a depth of around 10 to 15 centimetres provides security. Smooth inner walls protect their wings. Give the front warmth and the rear shelter from wind, and the object on the fence becomes a place where bees settle.

How to build an insect house from tubes

The brief version is simple: a sturdy frame, a watertight roof and plenty of clean tubes are all you need. Use reed, bamboo or paper sleeves, cut them to 12 to 15 centimetres, and seal the rear ends of the tubes. You can use natural nodes or close them with clay or hot glue. Bundle the tubes together, place them in a tin or wooden frame, angle them slightly forwards, face them south-east to south, then hang them 1 to 2 metres above the ground.

As the details matter, here are three more practical steps. Sand the cut edges smooth on the inside, leaving no fibres or splinters. Vary the diameters-3–4 mm, 5–6 mm and a few at 7–8 mm-so that many species can find a suitable nest. Honestly, nobody does this every day. Even so, a single peaceful afternoon spent with tools and tea is worthwhile, because its benefits can last for years.

Some mistakes are made with the best intentions. If the tubes are too short, have walls that are too thin, remain open at the back or are hung in the rain, they will stay empty.

“As smooth as a drinking straw, otherwise the bees will avoid it.”

• South-east is the ideal position. It warms up early without becoming too hot in the afternoon.
• More nesting tubes mean more offspring. Yet every individual tube matters.
• A small roof protects against dripping rain and mould.

What happens next? Life around the tube hotel

Once the first tubes have been sealed, a quiet serial drama begins in the garden. Some caps are made from clay, others from pieces of leaf or fine resin, and each one reveals a different female builder. Anyone who has seen this understands why a square metre of flowers beside the insect house is far more than decoration, and why pesticides take the life out of the picture. It is this closeness that holds everything together. Before long, a second bundle may appear a little further along in the light, and someone may ask you for the plans. It is contagious, in the best possible way.