Guides & advice
Choosing the right birdhouse
A good birdhouse is chosen first and foremost for its future occupants. Species, entrance, space and location must all work together.
Before considering shape or colour, observe the birds already present around your home. The best birdhouse is the one that meets their actual habits.
1. Identify the species present
An urban garden, balcony, orchard and woodland edge do not attract the same birds. Note the species seen through the seasons, then choose a compatible entrance. Installing several different birdhouses is often better than multiplying a single model.
Ideally, spend two or three twenty-minute sessions observing in the morning without standing too close to hedges. Note size, colours, behaviour and song. The citizen-science programme Garden Birds, run in association with the French National Museum of Natural History, helps identify visitors and turns your observations into useful research data.
The principle that changes everything
A birdhouse does not make a species appear if it is absent from the neighbourhood. It replaces a natural cavity that has become scarce for a population already present, provided the garden also offers food, water, vegetation and peace.
2. Choose the right entrance
| Target birds | Indicative entrance | Birdhouse type |
|---|---|---|
| Small tits | About 28 mm | Enclosed |
| Great tits | About 32 mm | Enclosed |
| Robins | Wide opening | Semi-open |
| Swallows | Front access | Purpose-designed shape |
| Owls and little owls | Large entrance | Large internal space |
These dimensions are general guidelines. Each product page specifies the recommended species and uses.
A few millimetres make a real difference. An entrance of 26 to 28 mm favours small tits, while a 32 mm diameter is better suited to great tits or tree sparrows. Semi-cavity nesters such as robins, black redstarts and white wagtails instead look for a broadly open front in a particularly discreet location.
Avoid perches beneath the entrance: cavity-nesting birds do not need them and predators may use them for support. A thick front panel, possibly protected by a well-fitted predator guard, is more resistant to woodpeckers, squirrels and rodents.
Watch: understanding a good birdhouse in the field
Nature filmmaker Marie Wild clearly explains the criteria that really matter: target species, exposure, fixing and peace. It is an excellent visual introduction before comparing models.
3. Check internal space and depth
The outside catches the eye. Yet it is the unseen internal design that truly protects the brood.
The entrance alone is not enough. The chamber must provide enough room for the brood and keep young birds away from the opening. A floor that is too narrow, an entrance that is too low or poorly ventilated space greatly reduces the birdhouse's value.
Think of the interior as a microclimate. The floor should have small drainage holes, while discreet ventilation beneath the roof prevents condensation without creating draughts. The inner wall below the entrance should remain rough or have fine grooves so that fledglings can grip it with their claws when they leave.
The roof should overhang enough to protect the entrance, remain watertight and open for cleaning. However, an opening convenient for people must never be liftable by a predator: a solid hinge, hook or retaining screw is preferable to a loose lid.
The right question is not ‘Which birdhouse is the prettiest?’ but ‘Which natural cavity does it reproduce, and for which bird?’
The ecological principle to remember when choosing
4. Choose suitable materials
- Wood thick enough to limit temperature swings
- A non-slip interior surface so young birds can climb out
- Discreet drainage and ventilation
- An opening that makes annual cleaning easier
- Finishes free from harmful treatments inside
Untreated solid wood remains the benchmark for small passerines. Boards about 2 cm thick provide good insulation against rapid temperature changes. Avoid thin metal or plastic walls that may overheat, as well as particleboard that ages poorly in damp conditions.
Outside, a neutral matt shade blends into the surroundings more effectively. If protection is needed, choose a product explicitly suitable for animal shelters and apply it only to the outside, well before installation. The inside must remain untreated, without paint, stain, exposed glue or fragrance.
5. Plan the location
Before buying, make sure you have a stable support, a suitable height and an orientation protected from strong sun and prevailing winds. An excellent model in the wrong place will often remain empty.
A quick choice, species by species
Start with the bird you have observed, then work back to the right model—never the other way round.
| Species likely to be present | Birdhouse to look for | Decisive detail |
|---|---|---|
| Blue tit | Enclosed box, 26–28 mm hole | Floor about 13 × 13 cm |
| Great tit | Enclosed box, 32 mm hole | More generous chamber |
| House sparrow | 32–40 mm hole or colony birdhouse | A naturally colonial species |
| European robin | Semi-open birdhouse | Low, well-concealed position |
| Common redstart | Oval opening, 32 × 46 mm | Quiet, tree-filled area |
| Eurasian nuthatch | Large 46–50 mm hole | Install at least 4 m high |
These values are commonly accepted guidelines for passerine birdhouses. The species' local presence remains the primary criterion.
Before ordering: the 60-second check
- A realistic target species: you have observed it in the garden or very nearby.
- A suitable entrance: the exact diameter, a semi-open front or a specialist shape according to the species.
- Sound construction: thick wood, untreated interior, drainage, ventilation and a watertight roof.
- Possible maintenance: the roof or front opens and closes securely.
- A location already identified: quiet, stable, away from intense sun and not beside an active feeder.
Frequently asked questions
Is a colourful birdhouse less effective?
Colour alone is not prohibitive, but a dark or bright finish may absorb more heat or make the shelter more visible. A natural, matt and non-toxic shade remains the safest choice.
Should I put straw inside?
No. Birds build their own nests using materials suited to their species. Added filling may trap moisture and reduce the useful space.
Is a birdhouse with a camera a good idea?
Yes, if the camera is built into the design, without permanent light, heat or repeated opening of the birdhouse. Observation must never alter the adults' behaviour.
Why does my birdhouse remain empty?
The target species may be absent, the birdhouse may be too exposed or too close to a busy area, or it may simply not have been found yet. Do not move it during the season; assess the situation calmly in autumn.
Further reading: our sources
These institutional resources let you check dimensions, identify the birds present and place your birdhouse within a broader approach to supporting biodiversity.