Bespoke Dog Dens: Building a Luxury Built-In Pet Bed Under the Stairs

A dog den should be sized to allow the dog to stand, turn around, and lie down fully stretched in their natural resting position. For a medium dog (Cocker Spaniel, Labrador), a den of 900mm wide × 700mm deep × 700mm high is comfortable. For large breeds (Labrador Retriever, Golden Retriever), 1100mm × 900mm × 900mm is the minimum. The opening should be wide enough for the dog to enter without ducking, and the floor base should be removable in full sections for washing — a feature that is essential for practical use.

The dog den is designed as one section within the overall hallway joinery composition — aligned in height and panel style with adjacent boot room storage or coat hooks. The den opening is finished with a doorstep detail to contain bedding. A timber arch or simple square-framed opening both work aesthetically. The den interior is painted in a hardwearing finish, and the removable floor panel is fitted with a flush-lift handle. A small ventilation slot at the rear prevents the den interior from becoming humid.

The geometry of the staircase decides more of the design than most owners expect. A typical domestic flight runs at 38–42 degrees, which means the headroom inside the void drops by roughly 200mm for every 250mm you move towards the back wall. The den opening therefore belongs at the tall end of the void, beside the newel post, where the dog can walk in upright without ducking. The sleeping area itself can run back into the lower zone quite happily — a lying dog needs far less height than a standing one, and the tapering back of the void makes a natural cave.

That taper is actually the den’s biggest asset. Most dogs are den animals by instinct and prefer an enclosed, low-ceilinged retreat to an open basket in the middle of a room. When I survey, I measure the soffit height at every riser position, note where the useful standing height runs out, and place the partition between den and any adjoining storage exactly where the dog stops being able to sit up comfortably — usually where the soffit falls below about 500mm for a medium breed.

Orientation matters too. I try to face the opening down the hallway rather than straight at the front door, so the dog can watch household traffic — which most dogs love — without lying in the draught line of the letterbox every time the door opens in January.

An open arched or square-framed opening is the simplest option and the one most families settle on: the dog comes and goes freely, the hallway stays calm, and there is no hardware to maintain. If you do want the ability to contain the dog — for meal times, deliveries, or a decorator’s visit — a half-height gate is usually better than a full door. It keeps sightlines and airflow open, so the dog is contained without being shut in a dark box.

Where a full door is the brief, I hang it on soft-close concealed hinges or run it as a small sliding barn-style door on a face-fixed track, which suits narrow hallways because it needs no swing space. Any closing door gets ventilation designed in from the start — slotted panels or a generous gap top and bottom — and I always advise against latching a dog in anywhere you cannot see or hear it. The door is a management tool for short periods, not a kennel lock.

I build den carcasses the same way I build under-stairs storage: 18mm moisture-resistant MDF for painted work, or 18mm birch plywood where the structure takes more punishment. For dens, ply earns its premium more often than usual — its edges resist claw damage far better than MDF, and its screw-holding means the partition and base bearers stay tight through years of a heavy dog flopping against them.

The detail that matters most is edge protection. Dogs that chew always start on an exposed corner, so every edge the dog can reach — the opening reveal, the doorstep, the partition nose — gets lipped in solid oak or another dense hardwood, radiused to a 6–9mm round-over so there is no crisp arris to get teeth behind. Painted MDF left bare at the opening is the classic failure: one winter of teething and the paint line is wrecked. For known chewers I add a brushed stainless threshold plate, which also takes the daily scuff of claws crossing in and out.

If a built-in dog bed has one non-negotiable feature, it is a floor you can take out and wash. I make the base from 12–18mm plywood in one or two panels, sealed on every face and edge so spills and accidents cannot soak into end grain, with flush-fitting lift rings so the panels come out in seconds without tools. The panels sit on softwood bearers a few millimetres proud of the hallway floor, which keeps the base dry, lets air circulate beneath it, and means the panel can go outside for a proper scrub and dry before it goes back.

Around the opening I build a doorstep lip of 40–60mm. That small upstand does three jobs: it holds the mattress in place, it stops hair and biscuit crumbs migrating out into the hallway, and it gives the hardwood lipping a natural home. I size the internal floor around standard washable dog mattresses rather than bespoke cushions — when the bedding wears out in three or four years, you want to buy a replacement off the shelf, not commission one.

A sleeping dog is a small radiator that breathes out moisture all night. Seal that inside an unvented box and within weeks you have condensation on the paint, damp bedding and the beginnings of a smell no amount of washing fixes. Every den I build gets an airflow path: slot vents cut discreetly at the rear or high in the partition, working with the opening itself so air moves through rather than sitting still. On ground floors over suspended timber, I also check the void is not pulling cold draughts up through gaps in the floorboards — the base bearers and sealed floor panel deal with that.

Temperature is mostly about position. The void’s enclosed sides make it naturally snug, so the den should not sit hard against a hallway radiator or share a thin partition with a heating pipe run — overheating bothers dogs more than cold does. Equally, an opening facing the front door catches a blast of winter air every time someone comes in. A survey walk-through with the front door open on a cold day tells you everything about where the draughts actually run.

The den itself wants very little light — dogs settle better in shadow — but a low-level, warm-white LED on a PIR sensor is genuinely useful, letting you check on the dog at night and find stray bedding without putting the hallway lights on. A rechargeable battery unit avoids electrical work entirely; a wired feed from a nearby socket circuit, installed by an electrician, is tidier long-term. Either way I keep the fitting indirect, tucked above the opening reveal so the sleeping area stays dim.

What I steer clients away from is heat: heated pads and lamps inside an enclosed timber den are an overheating and safety risk a healthy dog simply does not need. If the household wants a feeding station, I build it beside the den rather than inside it — a recessed bay with a waterproof tray or tiled base for water and food bowls keeps spills off the joinery and out of the bedding.

A den rarely takes the whole void. The dog occupies the bottom 700–900mm of the tall zone, which leaves useful storage above and beside it, and the best schemes treat the den as one bay within a larger fitted composition. Above the den I typically run a cupboard or a bank of drawers; beside it, in the middle zone of the void, deep pull-outs on full-extension runners work exactly as they would in a pure storage scheme.

The natural move is to give the dog its own storage. A dedicated drawer near the opening for leads, towels, poo bags and treats means the whole dog routine lives in one square metre of hallway, and a lidded pull-out bin for food keeps kibble in a rodent-proof, airtight home rather than a sack in the garage. As part of a wider under-stairs or hallway joinery project, the den element typically adds £400–£800 to the overall cost, which buys the partition, hardwood detailing, removable base and interior finish.

Visually, the den reads as part of the composition because its panel lines, rail heights and paint colour align with the storage fronts around it. Done well, visitors read handsome hallway panelling first and only then notice a dog looking back at them.

Inside the den, the finish has to shrug off claws, damp fur and weekly wiping. A two-pack polyurethane finish or a hardwearing scrubbable acrylic eggshell both work; ordinary matt emulsion does not, and neither does a soft chalky designer finish, however good the colour card looks. Mid-to-dark interior colours hide the inevitable scuffing and nose marks far better than brilliant white, and a slightly deeper shade inside the opening also makes the den feel more cave-like, which dogs prefer.

Externally, the fronts match the rest of the hallway joinery — usually a painted finish colour-matched to skirtings and architraves so the run reads as original to the house. The hardwood lippings around the opening can be finished clear with a hardwax oil, which is easy to patch-repair when a teething puppy has a go at it, or painted through with the fronts if you want the opening to disappear into the composition.

The joinery is only half the project; the other half is the dog agreeing to use it. The reliable method is scent and routine. Move the dog’s existing bedding into the den unwashed on day one, so the space smells like theirs immediately. Feed them beside the opening for the first week, drop treats inside without ceremony, and let them explore in their own time. What you must not do is force the dog in or shut the door in the first weeks — one bad association can set the project back months.

Crate-trained dogs usually move in within days, because an enclosed sleeping space is already their normal; for these dogs I sometimes size the den interior to match their existing crate dimensions so even the proportions feel familiar. Older or more anxious dogs take longer, and puppies take to a den fastest of all. In most households the tipping point comes inside a fortnight, after which the problem reverses: getting the dog out of the den becomes the challenge.

The first and most common mistake is sizing the den to the space rather than the dog. Measure the dog lying fully stretched on its side — not curled — and add a margin; a den the dog cannot stretch in will be abandoned for the sofa. The second is a fixed floor: without a lift-out base, the den becomes impossible to clean properly within a year, and an uncleanable den is a smelly den. The third is sealing the space with no airflow, covered above, and the fourth is siting the opening in the draught line of the front door or hard against a radiator.

On the joinery side, the recurring errors are unprotected MDF edges at the opening, soft single-pack paint inside, and forgetting that the dog’s kit needs a home too — a den with nowhere for leads, towels and food ends up with all three piled on top of it. None of these mistakes is expensive to avoid at design stage; all of them are annoying to fix after the paint has dried.

A den project follows the same rhythm as any workshop-built under-stairs scheme. After the survey and design sign-off, carcasses, partitions and fronts are cut and pre-assembled off-site over two to three weeks. Day one on site is strip-out and first fix: any existing spandrel panel comes off, services are checked and compartmented, and the carcass and den partition go in level and scribed to the rake. Day two covers the base bearers, the removable floor panels, hardwood lippings, fronts and hardware. Day three, where needed, is scribes, caulking and paint.

The dog should spend the fitting days elsewhere in the house or with a neighbour — not for safety so much as because every dog in Berkshire believes power tools are a personal attack. I use low-VOC adhesives and finishes as standard, but I still advise airing the hallway for a day or two before the bedding goes in, so the den smells of the dog’s blanket rather than fresh paint on night one.

Living with a built-in den is deliberately low-effort. Bedding goes through the washing machine weekly like any dog mattress. Once a month, lift the floor panels out, vacuum the void beneath, wash the panels and let them dry fully before refitting. Wipe the interior paintwork with a damp cloth and mild detergent rather than aggressive sprays, and run the vacuum crevice tool along the vent slots when you do the skirtings — blocked vents are the usual culprit when a den starts smelling musty.

Expect the interior paint to want refreshing every three to five years — sooner than hallway joinery generally, because claws are harder on a finish than hands. The hardwood lippings can be re-oiled or sanded back in minutes. Because the den is built as a standard carcass bay on standard hardware, it can also be converted back to drawers or shelving in a day’s work when the household’s needs change — which is exactly the kind of future-proofing bespoke joinery should give you.