Where Do Starlings Nest? Nest Sites, Boxes & Breeding Season Guide

The Common Starling (Sturnus vulgaris) is one of the UK's most familiar and vocal birds. While their iridescent, oil-slick plumage and famous winter murmurations capture our attention, their nesting habits are equally complex.

Starlings are obligate cavity nesters. They cannot weave a freestanding nest in the branches of a tree like a blackbird or a finch. Instead, they rely entirely on finding a secure, enclosed space to raise their young.

This reliance on cavities has shaped everything from their breeding timeline to their relationship with humans. As natural nesting sites have declined, starlings have adapted to use our buildings, leading to both conservation opportunities and occasional conflicts.

In a purely natural landscape, starlings seek out mature woodlands, parklands, and orchards. They look for trees with natural hollows caused by rot or dropped branches, particularly favouring oak, ash, and beech.

They are also opportunistic tenants, frequently taking over old nest holes excavated by Great Spotted Woodpeckers. On the coast, they will nest deep within the crevices of sea cliffs.

However, the modern landscape offers far more artificial cavities than natural ones. Starlings frequently exploit gaps under roof tiles, holes in soffits, and the eaves of occupied buildings.

Because starlings live and forage in flocks year-round, they also breed in loose colonies. If you spot one starling carrying nesting material into a roof space, there are likely several other pairs setting up home in the immediate vicinity.

The nesting process begins with the male. In early spring, he claims a suitable cavity and begins to advertise his real estate to passing females. He sits near the entrance, singing a complex, chattering song while rapidly waving his wings in a distinctive display.

To prove the site's worth, the male begins constructing the foundation of the nest. He carries in dry grass, pine needles, and small twigs, building a bulky, untidy cup. If the cavity is particularly deep, he may bring in an enormous volume of material simply to raise the nest cup closer to the entrance hole.

Once a female accepts the male and his chosen cavity, she takes over the interior design. She lines the central cup with softer materials, including moss, wool, and feathers, creating a well-insulated environment for her eggs.

The starling breeding season operates on a tight, highly synchronised schedule. Within a local colony, most females will begin laying their eggs within a few days of each other, usually in mid-April.

A typical clutch consists of four to six pale blue, unmarked eggs. Incubation lasts just 12 days. Both parents share the duty of keeping the eggs warm, though the female takes the night shift, developing a bare 'brood patch' on her belly to transfer body heat directly to the clutch.

Starling chicks hatch blind, naked, and entirely dependent on their parents. For the next three weeks, the adults work relentlessly. A pair of starlings can make up to 300 foraging trips a day, initially bringing soft-bodied caterpillars and leatherjackets (cranefly larvae) before graduating to harder beetles and earthworms as the chicks grow.

After roughly 21 days, the young starlings are fully feathered and ready to leave the cavity. At this stage, they lack the glossy, speckled plumage of their parents, sporting a uniform, mousy-brown coat instead.

Leaving the nest does not mean immediate independence. The fledglings remain with their parents for another one to two weeks, noisily begging for food while they learn to probe the ground for invertebrates. If the first brood is successful and the weather remains favourable, the pair may attempt a second brood in June.

Starlings are highly site-faithful. A colony will return to the same breeding grounds year after year, provided the habitat remains suitable and food is abundant.

A successful nesting cavity — whether a natural tree hollow or a gap in a roof — will almost certainly be reused the following spring. However, it is not guaranteed that the exact same pair will occupy the hole. The colony returns as a collective, and a new courting couple may claim a previously used site.

Because starlings do not remove old nesting material, a frequently used cavity can become packed with layers of old grass and debris over several seasons.

The UK starling population has declined by over 60% since the mid-1970s, placing them on the UK Red List of birds of conservation concern. The loss of natural nesting sites and the sealing up of modern houses are significant factors in this decline. Putting up a purpose-built nest box is one of the most effective ways to support them.

Starlings readily accept artificial boxes, but the dimensions must be correct. A standard tit box is far too small. A starling nest box requires an internal floor area of approximately 15cm x 15cm and a total height of 25cm to 30cm.

The most critical measurement is the entrance hole, which must be exactly 45mm in diameter. This is large enough for a starling to enter comfortably, but small enough to exclude larger predators and competitors like Jackdaws or Grey Squirrels.

Position the box at least 3 metres (10 feet) off the ground. The eaves of a house or high up on a mature tree are ideal locations. Ensure the box faces north or east to protect the occupants from strong sunlight and prevailing wet winds. Because starlings are colonial nesters, you can place two or three boxes on the same side of your house, spaced a few metres apart, to encourage a small colony to settle.

While many birdwatchers welcome nesting starlings, a colony taking up residence inside a roof space can cause genuine issues for homeowners. They are notoriously noisy, and their bulky nests can block ventilation shafts or create a mess of droppings down the side of a property.

If you need to deter starlings, the only effective and humane method is exclusion. Inspect your roofline, soffits, and eaves for gaps larger than 40mm. Block these entry points using tightly rolled wire mesh, durable netting, or solid timber repairs.

Crucially, this maintenance must be carried out in autumn or winter. Under the UK's Wildlife and Countryside Act 1981, it is a criminal offence to intentionally damage, destroy, or block access to an active wild bird's nest. Once a starling has begun building in spring, you must wait until the chicks have fledged and the nest is entirely abandoned before sealing the hole. Attempting to remove a nest while eggs or chicks are present can result in an unlimited fine or imprisonment.

Once the breeding season concludes in early summer, the colony abandons the nesting sites entirely. The territorial boundaries dissolve, and the parents and their newly independent fledglings gather into massive, highly gregarious flocks.

Rather than sleeping in their nesting cavities, these post-breeding flocks seek out communal roosts for safety and warmth. They gather in dense reedbeds, woodlands, cliffs, or even on the scaffolding of urban buildings.

As autumn approaches, the UK's resident starling population is joined by millions of migrant starlings fleeing the freezing winters of mainland Europe. These roosts swell to enormous sizes, eventually creating the vast, shape-shifting aerial displays known as murmurations before the birds funnel down into the reeds for the night.