Why a Bug Hotel Is Worth the Bother

Britain is home to more than 250 species of solitary bee, alongside countless ladybirds, lacewings, hoverflies and beetles that quietly go about pollinating our fruit and eating our aphids. Unlike honeybees, most of these insects don't live in colonies. They nest alone, in small hollows: a beetle hole in an old fence post, a crack in a wall, a hollow stem left standing over winter. Tidy modern gardens often lack such nooks, and a bug hotel is a simple way to put some back.

It is worth being honest about what a bug hotel is and isn't. It won't replace proper habitat, and one that is damp, sealed or packed with the wrong materials can do more harm than good. Built well, though, it becomes a genuine nursery and a winter refuge — and it costs almost nothing if you use what's already lying about.

Pick a Spot Before You Pick Up a Hammer

Placement matters more than the structure itself. Solitary bees need warmth, and a hotel in deep shade will stay cold and damp. Choose a south or south-east facing wall, fence or shed, ideally catching the morning sun so residents warm up early. Shelter it from prevailing wind and driving rain; under the eaves of a shed or beneath a hedge is ideal.

Mount the hotel off the ground, roughly a metre to a metre and a half up, on bricks or a sturdy post. This keeps it dry and beyond the reach of slugs, mice and ground predators. Position it near flowers and, if you can, within a few metres of a pond or bird bath so there is water nearby.

Gather the Right Materials

Variety is the point. Different insects want different things, so build several compartments rather than one box of the same stuff. Avoid anything treated with wood preserver, paint or varnish.

• Bamboo canes and hollow stems — cut slightly shorter than the box and bundle tightly, tubes facing outwards. Tubes of 6–10mm suit most solitary bees; keep the far ends closed so there is no through-draught.
• Drilled hardwood logs — oak, ash or beech, drilled with 3–10mm holes about 10cm deep into the sawn end grain. Softwood splits and won't last.
• Bricks and stones — stacked loosely to create cool crevices for beetles, centipedes and frogs.
• Dead leaves and leaf litter — a generous handful per compartment shelters ladybirds and hibernating butterflies.
• Straw or hay — snug and dry, favoured by overwintering lacewings.
• Bark, wood shavings, broken terracotta — fillers that hold moisture and offer shelter at different scales.
• Corrugated cardboard — rolled into tubes, it is a magnet for lacewings seeking a winter home.

Building It, Step by Step

An old wooden pallet is the classic starting point. Look for one stamped HT (heat treated) rather than MB, give it a scrub and let it dry for a day or two.

• Cut and frame. Break the pallet down into slats and build a box roughly 40–60cm square and 20–30cm deep. Battens screwed to the back make hanging easy.
• Add a back and roof. The roof should overhang by at least 5cm and slope forwards. This is what keeps rain out, so don't skip it.
• Divide the space. Use offcuts of timber to make compartments of different sizes, or simply stack bricks to create natural sections.
• Fill it. Pack bamboo and stems horizontally so the tubes face outwards, pushing them in firmly. Loose fill rattles about and discourages nesting.
• Site it. Leave one compartment part-filled with leaves and one with drilled logs, then wedge the whole thing onto bricks against your chosen wall.

If carpentry isn't your thing, a stack of old bricks with gaps, topped by a couple of loose roof tiles and stuffed with canes and leaves, does the job just as well. Many of the best bug hotels are gloriously ramshackle.

Looking After It Through the Year

Once it's up, mostly leave it alone. The commonest mistake is tidying it in autumn, just as residents are settling in for winter. Don't move it between October and March.

In late spring, once the bees have emerged, check whether any tubes look blocked or mouldy and replace them. Damp is the enemy: if you find soggy leaves or rotting canes, improve the drainage and check the roof still overhangs properly. Keep the surrounding area free of pesticides, and let a few nettles, ivy or a patch of long grass grow nearby so there is food and cover on the doorstep.

Then do the nicest bit — sit back and watch. A drilled log in full sun on a warm May morning will often draw a leafcutter bee within a day or two, and the sight of a ladybird tucked into the leaf litter in January is its own small reward.