There is something deeply satisfying about turning a bundle of prunings and a few old bricks into a bustling wildlife refuge. A bug hotel—sometimes called an insect hotel or bug house—is simply a structure filled with natural materials that offer shelter to our smaller garden companions. You do not need to spend a penny. Everything you need is likely already lying around your garden, allotment, or tucked behind the shed.

Why bother with a bug hotel?

Our native insects are having a tough time. Habitats have shrunk, and tidy gardens often leave little space for creatures that need nooks and crannies to rest, breed, and overwinter. A bug hotel is a small but meaningful way to help. Solitary bees will use it for nesting, ladybirds and lacewings will shelter there through the coldest months, and beetles will burrow into decaying wood. In return, these creatures pollinate your flowers and crops, and many of them eat garden pests such as aphids and slugs. You are also recycling garden waste that might otherwise be burned or bagged up. It is a win for wildlife and a win for your compost heap.

Choosing the right spot

Position matters more than size. Most beneficial insects need warmth to become active, so choose a sunny, sheltered spot that faces south or south-west. A wall, fence, or dense hedge behind the hotel will protect it from driving rain and cold winds. Place it at least half a metre above the ground if possible—on top of a couple of bricks or an old pallet—so that damp does not creep in from the soil. Do not tuck it into deep shade. That said, different creatures have different needs, so a mix of conditions is ideal. If you have room, create one sunny section for bees and a damper, shadier corner for beetles and woodlice. Keep it near flowering plants so that bees do not have to travel far for nectar.

What to collect from your garden waste

Almost anything natural and untreated can be used. Here are the best materials to gather:

• Hollow stems: bamboo canes, sunflower stalks, fennel, and old raspberry canes. Cut them into 10–20 cm lengths so that solitary bees can crawl in.
• Twigs and sticks: bundles of dead twigs from pruning, tied tightly with garden string. These create gaps for beetles and spiders.
• Dead wood: logs and branches, especially those with loose bark or drilled holes (6–10 mm wide) to mimic beetle tunnels.
• Old bricks: the ones with holes are perfect. Stack them with the holes facing outwards.
• Leaf litter and moss: a handful of dry leaves, moss, or straw (not hay, which goes mouldy) provides soft bedding for hibernating insects.
• Cardboard tubes: from kitchen rolls or toilet rolls, packed into a frame. They will slowly rot down and can be replaced.
• Broken terracotta pots: use the shards to create a damp, dark crevice for frogs and beetles.

Avoid treated timber, plastic, shiny paper, and anything containing chemicals. Never use glass or sharp metal. If you are unsure, leave it out.

A simple design you can build in an hour

You do not need carpentry skills. The easiest bug hotel is a stack of old bricks and logs, held together by gravity and a little imagination. Start with a base of two bricks laid flat, leaving a gap between them. Lay a log across the top, then add another layer of bricks at right angles. Fill the gaps with your collected materials: a bundle of hollow stems here, a pile of twigs there, a handful of leaf litter in another gap. Top it with a flat stone, a slate, or a piece of broken paving to keep the rain out. If you prefer something tidier, use an old wooden pallet or a wooden crate as a frame. Cut it down to about 30 cm by 30 cm if needed, then fill each section with a different material. Alternatively, make a simple “bug bundle” by tying a fistful of hollow stems and twigs together with string and hanging it on a fence. It will not last as long, but it works.

Keeping your guests happy

Once built, leave it alone. The biggest mistake is tidying up. Solitary bees lay their eggs in the stems during spring and summer, and those eggs overwinter inside. If you clean out the hotel in autumn, you destroy the next generation. Wait until late spring, after the bees have emerged, before replacing any damp or mouldy material. Check that the roof is still watertight; if not, add another slate. Do not use pesticides or herbicides anywhere near the hotel. If you spot mould, remove the affected stems and replace them with fresh dry ones. Top up leaf litter in autumn. A well-sited hotel can last for years, slowly weathering and becoming part of the garden’s fabric.

Common pitfalls to avoid

Even well-meaning bug hotels can go wrong. Do not use hay, as it holds moisture and turns mouldy. Do not seal the hotel tightly—insects need air flow. Do not place it in full sun if you are using damp materials; that defeats the purpose. Do not use treated wood, which can be toxic. Do not make it too large or too deep, as this can encourage rodents. And do not worry if nothing moves in immediately. It can take a season or two for word to get around the insect world. Be patient, keep the hotel dry and sheltered, and you will soon see solitary bees sealing their nests, ladybirds clustering in the twigs, and beetles scuttling into the dark. Your garden waste has become a home.