Reptiles are not demanding tenants, but they are particular about three things: somewhere warm to sit, somewhere safe to hide, and somewhere frost-free to sleep through winter. Heathland normally supplies all three — until it stops. Scrub creeps in, bare sand gets shaded over, tidy management flattens the tussocks, and a piece of ground that once held common lizards and slow worms quietly empties.

A refuge is one of the cheapest and most satisfying jobs in heathland conservation. It uses materials you can gather within a few metres, takes an afternoon, and gives reptiles the small, warm, sheltered places they cannot make for themselves.

What a Good Refuge Provides

Before you dig anything, think in terms of three separate needs. A refuge that only meets one of them will be used for part of the year and ignored for the rest.

Basking sites

Reptiles cannot raise their body temperature from the inside, so they shuttle between sun and shade to warm up. What they want is bare, dry ground next to cover — a flat stone, a patch of sand, a tussock to lean against — with an escape route within a body length. South-facing slopes warm fastest in the morning, which matters most in spring and autumn.

Cover and movement corridors

Between basking trips, reptiles need to move without crossing open ground where birds and cats can see them. Log piles, brash, dense heather and rough grass edges act as corridors. A refuge that links one patch of good habitat to another is far more valuable than an isolated one in the middle of mown ground.

Hibernation sites

From roughly October to March, reptiles disappear underground. They need somewhere that stays above freezing but cool and damp, with enough structure to stop the chamber collapsing. That usually means rubble, old roots and sand rather than a sealed box. A well-made hibernaculum can be used for years by lizards, slow worms, grass snakes and, on the right heath, adders.

Choosing the Site

Look for ground that already hints at reptile interest: sloughed skins, small droppings, a lizard darting off a sunny path. Failing that, south or south-west facing, sloping, free-draining and open to the morning sun is the right starting point.

Avoid hollows that collect water, deep shade under trees, and anything within a few metres of a busy path or a dog-walking route. If the site is a designated one — and many lowland heaths are — check with the landowner and the local wildlife trust or the relevant conservation body before you move soil or cut vegetation. On a nature reserve, ask the warden where a refuge would actually help. They usually know exactly where the gaps are.

Building a Basking Bank

This is the quick win, and it is genuinely a half-hour job.

1. Mark out a patch roughly 2 metres by 1 metre on a sunny slope.
2. Clear the vegetation from about half of it and rake the surface so it is slightly uneven. Small hollows and ridges trap warmth.
3. Shape a gentle south-facing bank no more than 30 cm high. Steep faces erode; very shallow ones warm too slowly.
4. Bed in a few flat stones or broken slabs, tilted slightly towards the sun, sitting flush with the soil. Stone heats up quickly and holds warmth into the evening.
5. Scatter a thin layer of sand or fine grit around them. Bare sand is used for basking and sometimes for egg-laying.
6. Leave the other half rough: a tussock of grass, a clump of heather, a couple of dead branches laid at the edge. That is the escape route.

Repeat this in two or three places a few metres apart rather than making one large feature. A mosaic of small warm patches supports more animals than a single big one.

Making a Hibernaculum

Hibernation sites take more effort, but they are the difference between a summer refuge and a permanent one. Build them in early autumn, on a slope, so water drains away.

1. Dig a shallow pit about a metre across and 60 cm deep, on ground that will not flood.
2. Half-fill it loosely with a mix of broken brick, rubble, logs, thick branches and coarse sand. Keep the gaps — air space is insulation.
3. Add a layer of leaf litter, moss and dry grass.
4. Cap it with turf laid grass-side down, then a few more logs on top. Do not seal it with soil, plastic or a solid slab.
5. Leave one side open and facing the sun so reptiles can come and go on mild winter days and emerge early in spring.
6. Add a small basking patch on the sunny side, so animals can warm up the moment they surface.

You can do the same job more cheaply by half-burying a stack of logs, or by leaving a root plate from a felled tree in place and piling brash against one side. If you are already cutting scrub, that material is perfect — just do not burn it on the same spot, because a bonfire will cook whatever is sheltering underneath.

Materials: What to Use and What to Leave Out

• Use: local sand and grit, flat stones, dead wood, log stacks, brash, tussocks, moss, leaf litter, turf lifted from the same site.
• Avoid: treated or painted timber, plastic netting and mesh, sheets of glass, garden waste, bark mulch, and anything that has been near pesticide or herbicide.
• Think twice about: roofing felt and corrugated iron. They work well for surveys, but they are not natural, they can overheat on hot days, and they draw attention from people who might disturb the animals.

Keep everything low and rough-edged. A refuge that looks like a tidy piece of landscaping will be walked over. One that blends into the heather will be used.

Maintenance, Safety and Permission

Once built, less is more. Cut back encroaching scrub in rotation rather than all at once, and keep a few tussocks standing. Avoid strimming, mowing or flailing between October and March, when reptiles are dormant in and around the base of the vegetation. Never site a bonfire on or beside a refuge; build it somewhere else and move the material on the day.

Keep the structure away from paths, and keep dogs out of it in summer, especially on heaths where adders live. Adder bites are uncommon but painful and occasionally serious, and the snake only strikes when it is stepped on or picked up. Watch from a metre or two away and do not handle any reptile — it costs the animal energy it needs, and all native species are protected from being killed or injured, with smooth snake and sand lizard under much stronger protection. If you are unsure what applies where you are, ask the landowner or your local wildlife trust.

Leave It Alone, Then Look Again

A new refuge is best left untouched for at least a season. Disturbance is the main reason these features fail, and animals need time to find them. Come back on a warm, still morning in spring or a sunny afternoon in September, when reptiles are most likely to be out. Sit still, check the edges of the bare patches first, and give your eyes time to adjust to the heather. You will often hear a lizard before you see it: a rustle, a pause, then a flash of movement into cover.

If nothing shows up in the first year, do not be discouraged. Build a second feature a short distance away and connect the two with a rough corridor of logs and tall vegetation. Reptiles colonise slowly and in small numbers, but once a heath has warm, dry, undisturbed corners, they tend to stay.

Photo: 5598375 / Pixabay