How to Build a DIY Solitary Bee Hive: A Simple Step-by-Step Guide
Blog post description.
WILDLIFE
The Hidden Seven
8/24/20266 min read
How to Build a DIY Solitary Bee Hive: A Simple Step-by-Step Guide
Solitary bees are some of the most important pollinators in our gardens, yet unlike honeybees, most do not live in large colonies or produce honey. Instead, females build individual nests in small holes, hollow stems, walls, dead wood and even the ground.
A simple DIY solitary bee hive — often called a bee hotel or bee house — can provide valuable nesting space for species such as mason bees and leafcutter bees.
Around 90% of the UK's roughly 270 bee species are solitary bees, according to Buglife.
Better still, you can build a useful bee house from inexpensive materials in an afternoon.
What You'll Need
For a simple wooden solitary bee hive:
A block of untreated hardwood or other untreated solid timber
A drill
Drill bits between 2mm and 10mm
Sandpaper
A small piece of wood for a roof
Screws
A bracket, hook or other secure fixing
Optional bamboo or hollow plant stems
Avoid chemically treated or pressure-treated timber. The RHS recommends untreated wood at least 10cm deep, while deeper nesting holes are generally preferable.
For a more substantial bee house, aim for nesting tunnels around 15cm deep where your piece of timber allows it. The Bumblebee Conservation Trust recommends nesting tunnels of at least this depth.
Step 1: Choose Your Wood
Start with a solid block of untreated timber.
A block roughly:
15–20cm high × 15–20cm wide × 15cm deep
makes a useful small bee house.
It doesn't have to look perfect.
In fact, an old piece of suitable untreated timber can make an excellent nesting site.
The important things are that it is:
dry
untreated
solid
deep enough for nesting tunnels
free from rot
Never use freshly chemically treated fence posts or timber coated with preservatives inside the nesting holes.
Step 2: Mark Your Nesting Holes
Mark a series of holes across the front of your wooden block.
Don't make every hole the same size.
Different solitary bee species prefer different-sized cavities, so use drill bits ranging between approximately:
2mm and 10mm
For example:
3mm — 4mm — 5mm — 6mm — 7mm — 8mm — 9mm
The RHS notes that 8mm holes are particularly suitable for red mason bees, while smaller holes can attract other species.
Don't cram hundreds of holes into one giant hotel. Several smaller nesting sites spread around a garden can be better than concentrating large numbers of insects into one structure.
Step 3: Drill the Nesting Tunnels
Drill horizontally into the front of the block.
Important: Don't drill straight through.
Each tunnel needs a closed back.
Make the holes as deep as your block safely allows, ideally around 10–15cm, with approximately 15cm particularly useful where practical.
Buglife recommends holes up to about six inches (15cm) deep where possible.
You can angle the holes very slightly upward towards the back so that rain is less likely to run into them.
Step 4: Smooth Every Entrance
This is one of the most important steps.
After drilling, inspect every hole.
Use sandpaper or carefully clean the entrance so there are:
no sharp edges, splinters or loose fibres.
Bees repeatedly crawl backwards and forwards through these tunnels. Rough wood can damage their delicate wings.
Both the RHS and conservation organisations specifically recommend smooth, splinter-free nesting holes.
Step 5: Add a Roof
Solitary bees need dry nesting tunnels.
Fix a small sloping roof above the wooden block.
Allow it to project several centimetres beyond the front of the nesting holes.
Think of it as a little porch.
The overhang helps stop rain blowing directly into the tunnels, which can encourage damp and mould.
Protection from wet weather is an important feature of a well-designed solitary bee box.
Step 6: Add Bamboo or Hollow Stems — Optional
You can create additional nesting places using bamboo canes or naturally hollow plant stems.
Cut them into lengths of roughly 15cm or more, making sure:
the inside is hollow
one end is naturally closed or securely backed
the entrance is smooth
there are no splinters
the tubes cannot move around
Avoid very wide tubes. A mixture of internal diameters between approximately 2mm and 10mm is preferable.
Leafcutter bees, mason bees and several other cavity-nesting solitary bees may use them.
Step 7: Choose the Right Location
You can build the best bee house in the world and still find it empty if you put it in the wrong place.
Choose a location receiving plenty of morning and daytime sunshine.
A:
south-facing or south-east-facing wall or fence
is particularly suitable in the UK.
The Bumblebee Conservation Trust recommends full sunshine, preferably facing south-east or south, and positioning a solitary bee nest box at least around one metre above the ground.
Make sure vegetation doesn't grow across the entrances.
Step 8: Fix It Firmly
Don't leave your bee hive hanging from a piece of string where it swings in the wind.
Attach it firmly to:
a wall
fence
shed
sturdy post
The entire structure should remain stable when bees land on it.
A bee returning with pollen needs to find the same tiny entrance repeatedly, so a permanently fixed nest is much more suitable than one moving around in the wind.
Step 9: Put Flowers Nearby
A bee house provides somewhere to reproduce.
It does not provide food.
The surrounding habitat is just as important as the bee house itself.
Try growing a variety of nectar- and pollen-rich plants that flower from early spring through autumn.
Good garden plants can include:
lavender
foxglove
thyme
rosemary
comfrey
clover
dandelions
knapweed
native wildflowers
fruit-tree blossom
bramble
The RHS recommends creating bee nesting habitat alongside plentiful plants for pollinators.
You can also leave areas of your garden less tidy.
Dead stems, bare soil and old wood provide natural nesting opportunities that a manufactured bee house cannot replace.
Step 10: Wait for Your First Guests
Depending on where you live, you might see solitary bees investigating the holes during spring and summer.
A female bee may enter a tunnel carrying pollen.
Inside, she creates a succession of tiny chambers.
Each chamber generally contains:
pollen + an egg
before being sealed.
Mason bees often use mud to divide and close their cells.
Leafcutter bees use carefully cut pieces of leaves.
Eventually you may notice entrances sealed with mud or plant material.
That's a good sign.
Don't open them.
The next generation is developing inside.
Step 11: Leave Occupied Nests Alone
Once bees have sealed their nests, resist the temptation to investigate.
Larvae develop inside the tunnels and may remain there for many months before emerging.
Don't:
poke sticks into the holes
drill occupied timber
spray insecticides nearby
move the bee house unnecessarily
open sealed tubes
Simply watch from a respectful distance.
Solitary bees are generally very peaceful. Because they don't have a large colony or honey store to defend, they are much less defensive than many people imagine bees to be.
Step 12: Maintain Your Bee House
A bee hotel shouldn't simply be installed and forgotten forever.
Old nesting material can eventually accumulate:
fungi
mites
parasites
other pathogens
Natural wooden hotels will also gradually deteriorate.
The Bumblebee Conservation Trust recommends replacing nesting holes or materials periodically, with guidance suggesting replacement around every two years for some designs.
If you're uncertain whether old tubes still contain developing insects, don't simply destroy them.
Place them somewhere sheltered and sunny where any remaining insects can emerge naturally.
Buglife specifically recommends allowing old tubes to remain available for emergence when you're unsure whether they are still occupied.
An Even Simpler Version
If woodworking isn't your thing, you can create an extremely simple solitary bee shelter.
Take:
several pieces of hollow bamboo
cut them to approximately 15cm long
ensure the backs are closed
smooth the entrances
tightly bundle them together
place them beneath a waterproof cover
firmly attach the bundle horizontally to a sunny wall
That's it.
No complicated construction is required.
One Thing Many Bee Hotels Get Wrong
Bigger isn't necessarily better.
Huge decorative "insect hotels" containing hundreds or thousands of closely packed tubes might look impressive, but concentrating large numbers of nesting insects together can also increase opportunities for parasites and disease.
A collection of small, well-designed nesting sites surrounded by genuine wildlife habitat is often a more natural approach.
And remember that bee hotels only help cavity-nesting species.
Many solitary bees nest underground.
Leaving a small, sunny patch of bare or sparsely vegetated soil can provide habitat for mining bees too. The RHS specifically recommends sunny patches of bare soil for ground-nesting solitary species.
Your Solitary Bee Hive Checklist
Before installing your bee house, check:
Untreated timber
Holes approximately 2–10mm wide
Several different hole sizes
Deep nesting tunnels, preferably around 10–15cm where possible
Holes don't pass through the back
Entrances completely smooth
Waterproof overhanging roof
Sunny south or south-east-facing position
Around 1 metre or more above ground
Firmly fixed rather than swinging
Plenty of flowering plants nearby
No pesticides around the nesting area
Old nesting material monitored and replaced responsibly
Build a Home — Then Build the Habitat
Building a solitary bee hive might take only an hour or two.
But the best thing you can do for bees goes beyond constructing a wooden box.
Give them somewhere to nest, something to eat and a garden where nature is allowed a little space to exist.
Plant flowers. Leave some dead stems standing. Keep a patch of bare earth. Reduce pesticide use. Allow a few supposedly "untidy" corners to remain wild.
A tiny hole drilled into a piece of wood may not look like much to us.
To a solitary bee looking for somewhere to raise the next generation, it can be a home.
And sometimes helping nature really can begin with something that simple.
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