Why a Simple Bench Rewards the Effort

There is a particular pleasure in a bench you built yourself, sitting quietly at the end of a border with a mug of tea going cold beside you. Cottage gardens are full of these small destinations — a spot under the apple tree, a corner where the lavender spills over the path. Shop-bought benches are often flimsy, overpriced, or styled for a showroom rather than a damp British winter. Building your own means you choose the timber, the height, and the proportions to suit exactly where it will live.

This design is deliberately unfussy: a slatted seat, a modest backrest, and four square legs joined by rails. It uses no complicated joints, no router, and no specialist skills. If you can measure twice and drive a screw straight, you can build it in an afternoon.

Choosing Timber That Will Last

For an outdoor bench in the UK, you want timber that can shrug off rain, frost, and the occasional heatwave. Pressure-treated softwood — often sold as tanalised — is the sensible starting point. It is affordable, widely available, and the treatment penetrates right through the timber rather than sitting on the surface. A 47 x 75mm or 45 x 70mm section is ideal for the frame, while 70 x 70mm posts make solid legs.

• Treated softwood: cheap, easy to work, lasts a decade or more with occasional care.
• Larch or Douglas fir: naturally durable, takes a stain beautifully, slightly pricier.
• Oak: the long-term option. It will silver to a soft grey and outlive most of us.
• Avoid: untreated interior timber, rough sawn pallet wood with hidden nails, and anything already showing rot.

Ask your timber merchant to cut pieces roughly to length if you do not have a saw bench — it makes transport far easier and saves a good deal of sawing at home.

Tools, Fixings and Safety

You do not need a workshop full of kit. A cordless drill, a handsaw or circular saw, a tape measure, a square, a pencil, a spirit level, and a couple of clamps will see you through. For fixings, use galvanised or stainless steel screws — ordinary steel screws will bleed rust stains down the timber within a season.

• 5 x 80mm and 5 x 100mm galvanised screws for the frame.
• 4 x 50mm galvanised screws for the slats.
• An 8mm and a 5mm drill bit for pilot holes, plus a countersink bit.
• End-grain preservative, brushed onto every cut end.
• Gloves, safety glasses, and a dust mask when cutting treated timber.

Treated timber dust is unpleasant stuff, so cut outdoors or in a well-ventilated space, and sweep up thoroughly afterwards.

The Cutting List

These measurements make a bench roughly 1.6 metres long, 0.6 metres deep, and 0.9 metres high at the back. Scale the length up or down as you like, but keep the seat height at around 430mm — that is comfortable for most adults and works with a standard cushion.

• 4 legs, 70 x 70mm x 430mm.
• 2 side rails, 45 x 70mm x 430mm (front to back, joining the legs).
• 2 long rails, 45 x 70mm x 1500mm (front and back, under the seat).
• 2 back uprights, 45 x 70mm x 520mm.
• 5 seat slats, 38 x 75mm x 1600mm.
• 3 back slats, 38 x 75mm x 1600mm.

Brush preservative onto every fresh cut as you go. It takes a minute and adds years.

Assembly, Step by Step

Work on a flat surface — a pair of trestles or the patio will do. Building in sub-assemblies keeps everything square and makes the final assembly far less fiddly.

• Build two side frames. Screw a side rail between each pair of legs, roughly 350mm up from the bottom, using two 100mm screws per joint driven through the leg into the rail end. Pre-drill to prevent splitting.
• Stand the sides up and clamp the long rails across the tops of the legs, one at the front and one at the back. Check the diagonals with a tape — if they match, the bench is square. Screw through the legs into the rail ends.
• Fix the seat slats. Lay all five across the long rails with 12mm spacers between them to let rainwater drain away. Screw down with 50mm screws into each rail.
• Add the backrest. Screw the two uprights to the inside of the rear legs, sloping them back very slightly for comfort. Then fix the three back slats across them, spacing them evenly.
• Sand the edges lightly, particularly anywhere hands will rest, and round off the slat ends with a few strokes of medium paper.

Finishing and Finding the Right Spot

New treated timber can be left to weather to a soft grey, but a coat of decking oil or a coloured wood stain will deepen the tone and slow the drying that leads to splitting. Apply it on a dry day when rain is not forecast for 24 hours, and reapply each spring.

Finally, choose the site with care. Stand the bench on paving slabs or concrete pads rather than bare soil, so the legs are not permanently damp. A spot that catches morning sun and dappled afternoon shade is ideal, angled to look back along a border rather than at a fence. Once it is settled in, plant something loose and generous around the base — nepeta, alchemilla, or a scramble of thyme between the slabs. The bench should look, within a season or two, as though it has always been there.