DIY GUIDE · GARDEN & OUTDOOR · CHECKED OCTOBER 2026
How to build a raised bed yourself
An afternoon to build, an afternoon to fill. €240–€270 for a 1.8 × 1.2 m kit bed, filled.
Where and how big, timber or a kit, levelling, filling in layers, planting, and where it stops.
- Every step, start to finish
- Checked October 2026 — sources at the end
- Honest about when to call a pro
FIRST, THE HONEST ANSWER
Do it yourself, or get a gardener?
Do it yourself if…
- The bed will stand on fairly level ground in the open garden, away from the house walls
- It is low enough to build from a kit or one or two boards of timber high
- You can use a drill, a saw and a spirit level, and move a few hundred litres of soil
- The ground underneath drains, or the bed is there to lift plants above heavy soil
Get a pro if…
- The bed would hold back a slope or a bank, which makes it a retaining wall
- It would sit against the house, over or near the damp-proof course
- You want a tall bed in block, brick or stone with a footing
- The site holds water and needs drainage before any bed goes on it
Safety first
- Bags of topsoil and compost are heavy, and a bed takes many. The HSA's manual handling guidance is to avoid lifting from the ground with a twist and to keep the load close; use a barrow and half-fill buckets.
- Wear safety glasses when cutting and drilling timber, and gloves when handling rough sleepers and treated wood.
- Wash your hands after handling soil, compost and manure, and before eating; cover cuts.
- Use a battery drill outdoors, or a corded one only through an RCD-protected socket.
- Do not build a raised bed against a house wall; soil heaped above the damp-proof course lets damp into the house.
- Keep the bed low enough that its soil cannot push the sides over; tall retaining beds need designing.
Stop here: Retaining slopes, beds against the house, and tall masonry beds
A bed that holds back sloping ground is a retaining wall, and the weight of wet soil behind a wall that fails is a danger to anyone near it, so it needs designing and building by a professional. Soil heaped against the house above the damp-proof course lets damp into the walls. Changing ground levels by more than 1 metre is outside the landscaping exemption in Class 6 of Schedule 2 to the Planning and Development Regulations 2001, so a large terraced scheme can need planning permission. How to hire a raised bed builder →
| MATERIAL | COVERAGE | FOR THIS JOB |
|---|---|---|
| Raised bed kit or treated timber | A kit, or timber boards or sleepers treated for ground contact | One kit, or four sides cut to size |
| Corner posts and long screws | Square posts for the corners, exterior decking screws | Four posts, about a dozen screws per corner |
| Coarse base layer | Composted bark or coarse organic matter | A shallow layer in the bottom |
| Topsoil or planting soil | Screened topsoil or a vegetable planting soil | Most of the volume |
| Well-rotted manure or compost | For the top layer | A layer on top, forked in lightly |
How much soil you need
Fill volume in litres = length × width × depth in centimetres × 10, with length and width in metres. A bed 1.8 m × 1.2 m and 27 cm deep holds 1.8 × 1.2 × 27 × 10 ≈ 583 litres; fill to about 5 cm below the rim, so you need about 475 litres, or roughly 14 bags of 35 L.
Order a little extra: new fill settles over the first few weeks. For several beds, a bulk bag of topsoil is far cheaper than bags.
A raised bed kit comes with cut boards that slot or screw together and needs few tools; the better ones use thick boards and last for years. Building your own from treated sawn timber or sleepers costs less per metre and lets you make any size, but you will be cutting and drilling.
Make the bed narrow enough to reach the middle from either side without stepping on the soil, which most people can do across a bed about 1.2 m wide. Length is up to you; two shorter beds are easier to manage than one long one.
A single board or two gives enough depth for most vegetables and flowers. Shallow-rooted crops such as lettuce and strawberries suit a low bed; deep-rooted crops such as potatoes do better in a taller one. Very tall beds hold a lot of soil weight and are a different, structural job.
Use timber treated for ground contact, or naturally durable timber such as larch, for beds that will grow food. Avoid reclaimed timber that may have been soaked in old preservatives. Thicker boards last longer and do not bow under the weight of wet soil.
A good fill is a mix, not just bags of compost: a coarse base for drainage, a deep middle of topsoil or planting soil, and a top layer of well-rotted manure or compost. Pure multi-purpose compost shrinks, dries out fast and is expensive at this volume.
THE PART THAT DECIDES THE FINISH
Before you build — by the site you have
What the bed stands on decides how you prepare it. Find yours.
A lawn
The bed will go on grass.
- Mark out the footprint with string and canes
- Strip the turf from inside the footprint and stack it upside down to rot
- Fork over the soil underneath to break up compaction and help drainage
- Check the ground is roughly level, and dig a shallow trench where the sides will sit
Bare soil or an old bed
Soil that has been dug before.
- Clear perennial weeds and their roots
- Fork the soil over to a spade's depth
- Level the line where the sides will sit
- Mix some of the existing soil into the bottom of the bed
Paving or a hard surface
A patio, gravel or concrete area.
- Make the bed deeper, since roots cannot go down into the ground
- Keep any drainage holes or gaps at the base clear so water can escape
- Line the inside of the timber with a permeable membrane to protect it
- Keep it well away from the house wall and any air bricks
A sloping site
Ground that falls across the bed.
- On a gentle slope, level the bed by sinking the uphill side into the ground
- Do not prop the downhill side up to retain soil; that makes it a retaining wall
- Consider two shorter beds stepped down the slope
- On a steep slope, stop: this is a terracing job
THE JOB
The steps, in order
Choose the site and mark it out
30 minStart with the checks above for your site. Pick a sunny, sheltered spot, ideally facing south or west, away from tree roots and overhanging branches and well away from the house walls. Mark out the footprint with string and canes, checking the corners are square by measuring the diagonals, which should be equal. Leave room for paths on every side you need to work from.
- Stand at each side and check you can reach the middle
- Allow wheelbarrow width for paths
- Avoid frost pockets at the bottom of a slope
Mistake to avoid: Building the bed in the shade of a hedge and wondering why nothing grows.
Prepare the ground
1–2 hoursStrip the turf or clear the weeds from inside the footprint. Fork over the soil underneath to break up compaction so water can drain away and roots can go down. Then dig a shallow trench along each side where the timber will sit, and level the bottom of the trench with a spirit level on a straight board, so the frame sits level and solid.
- Stack stripped turf upside down in a corner to make loam
- Remove every perennial weed root from the footprint
- Lay a piece of cardboard over stubborn grass rather than chemicals
Mistake to avoid: Building straight on top of grass and weeds that grow up through the soil.
Cut and assemble the frame
1–2 hoursFor a kit, follow the maker's instructions and slot or screw the boards together at the corners. For your own timber, cut the boards to length, square and clean. Fix a square corner post inside each corner and screw the boards to it, drilling a pilot hole for each screw so the timber does not split. Use exterior decking screws, which are long and do not rust. For two or more boards high, stagger the joints at the corners.
- Assemble the frame on a flat surface, then carry it into place
- Check the frame is square by measuring the diagonals
- Use two screws per board at every post
Mistake to avoid: Driving screws without pilot holes and splitting the board ends.
Level and fix the frame in place
30–60 minSet the frame in its trench and check it with the spirit level along each side and across the corners. Pack soil under a low corner or scrape it away under a high one until it is level, then tamp the soil firmly back along the outside. On longer beds, drive a stake against the middle of each long side and screw it to the board to stop the side bowing outwards under the weight of the soil.
- Level before you fill; it is impossible after
- Sink the corner posts into the ground a little for extra hold
- Check level again after tamping
Mistake to avoid: Filling a frame that is out of level and having water run to one end.
Line the sides, if you want to
20 minTo make timber last longer, staple a permeable membrane or a heavy liner to the inside faces of the boards, keeping the bottom open so water drains through. Do not line the base with plastic; the bed must drain into the ground below. On a hard surface, use a permeable membrane across the base instead.
- Fold the liner neatly at the corners
- Keep the liner below the top edge of the boards
- Never use a sealed plastic base on soil
Mistake to avoid: Lining the bottom with plastic sheeting and turning the bed into a pond.
Fill in layers
1–2 hoursLoosen the ground inside the frame once more with the fork. Add a shallow coarse layer at the bottom, such as composted bark, to help drainage. Fill most of the bed with good topsoil or planting soil, firming it lightly every so often with the back of a rake. Finish with a layer of well-rotted manure or compost on top, and fork it lightly into the soil beneath. Fill to a few centimetres below the rim.
- Water each layer lightly as you fill so it settles evenly
- Mix in some of the soil you dug out from the footprint
- Never fill with subsoil or builders' rubble
Mistake to avoid: Filling the whole bed with bagged multi-purpose compost, which shrinks, dries out and starves the plants.
Let it settle
Two weeksLeave the filled bed for about a fortnight so the soil can settle. Water it if it is dry. Top it back up to a few centimetres below the rim before you plant. Building in autumn and leaving it over winter is ideal; the soil settles naturally and you can plant early in spring.
- Cover it with a mulch or cardboard over winter to keep weeds out
- Top up with compost before planting
- Rake the surface to a fine tilth for sowing
Mistake to avoid: Planting the same day and finding the plants sitting in a hollow a week later.
Plant or sow
1 hourPlant out or sow into the settled bed, following the spacing on the seed packet or plant label. Plant the tallest crops on the north side so they do not shade the rest. Water in well. Because you never walk on the soil, you can plant closer together than in an open garden.
- Rotate crops between beds each year
- Use a board across the bed to kneel on if you must lean in
- Mark rows with labels so you can tell crops from weeds
Mistake to avoid: Standing in the bed to plant and compacting the soil you prepared.
Look after it through the year
15 minWater in dry spells, ideally with rainwater; raised beds dry out faster than open ground. Hoe or hand-pull weeds weekly. Top up with compost or manure every year, as the soil level drops. Check the timber and the screws each winter and replace any board that has rotted.
- A drip line on a tap timer saves watering
- Mulch the surface to keep moisture in
- Net crops against birds and butterflies
Mistake to avoid: Forgetting to water in a dry June because the ground outside the bed looks damp.
The mistakes that show
- Making the bed too wide to reach the middle without standing on it
- Filling it with bagged compost alone, so it shrinks and dries out
- Leaving the frame out of level
- Building it against the house wall over the damp-proof course
Stop here and get a landscaper
- The bed would hold back a slope or a bank
- It would stand against the house or a boundary wall
- You want a tall masonry bed with a footing
- The ground holds water and needs drainage first
| WHAT YOU SEE | WHY, AND THE FIX |
|---|---|
| Soil level has dropped a lot | New fill settling and organic matter breaking down. Top up with compost or manure every year. |
| Water pooling on the surface | Compacted or clay ground under the bed, or a plastic base. Fork through, add grit and organic matter, and make sure the base is open to the ground. |
| Soil drying out quickly | Too much compost and not enough topsoil, or a sunny, windy spot. Mix in topsoil, mulch the surface and water more often. |
| Sides bowing outwards | Thin boards or no centre stakes. Drive a stake against the middle of each long side and screw it to the board. |
| Timber rotting at the corners | Untreated or thin timber, wet soil against it. Replace the boards, and line the inside with a permeable membrane. |
| Plants weak and yellow | Poor fill or no feeding. Add well-rotted manure or compost and a general feed; check the drainage. |
| Weeds growing through from below | Perennial weeds not cleared from the footprint. Dig them out and lay cardboard under the next bed. |
| Slugs eating everything | Raised beds give slugs shelter under the boards. Check under the edges at dusk, pick them off, and protect young plants with collars or a copper strip. |
WHAT YOU SAVE
What it costs to do it yourself
| Raised bed kit, 180 × 120 cm | €129.95–€159.95 |
|---|---|
| Or two new timber sleepers, 2.4 m, for a home-made frame | €53.90 |
| Topsoil, 10 bags of 35 L | €79.90 |
| Farmyard manure, 3 bags of 50 L | €20.97 |
| Composted bark for the base, 75 L | €9.99 |
| Total, first time, kit and fill for one bed | €241–€271 |
| DIY total | €240–€270 |
Guide prices compiled by the Locufy team from published Irish and UK provider price lists and 2026/27 cost guides. Updated 2026.
The fill costs nearly as much as the frame. For more than one bed, a bulk bag of topsoil delivered is far cheaper than bags, and your own compost and leaf mould cut the cost every year after.
RATHER NOT?
Raised bed builders near you, with prices shown
The ones who cover your area, nearest first, with one score from every review. No account needed to look.
Or post the job free and let them come to you.
Add a layer of compost, manure or leaf mould every autumn or spring as the level drops.
Stripped turf can be stacked to rot into loam or put in the brown bin, which mywaste.ie lists for garden waste. Clean rigid plastic pots and trays go in the recycling bin. Timber offcuts go to a civic amenity site; treated timber should not be burned.
Raised beds dry out faster than open ground. Mulch the surface and water with rainwater from a water butt.
Each winter, check the corners, stakes and screws, and replace any rotten board before the bed loses its shape.
Building a raised bed: questions people ask
A board or two deep suits most crops, with the soil below the bed forked over so roots can go down. Deep-rooted crops such as potatoes benefit from a taller bed.
Layers: a coarse base such as composted bark, a deep middle of good topsoil or planting soil, and a top layer of well-rotted manure or compost. Not bagged compost alone.
Fork the soil underneath and, if you like, add a layer of cardboard over grass to suppress it. Do not put plastic in the bottom; the bed must drain.
New timber treated for ground contact or a naturally durable timber such as larch. Avoid old reclaimed timber that may contain old preservatives.
Autumn or early spring. Built in autumn, the soil settles over winter and is ready to plant in spring.
The Locufy Irish price guide puts raised beds at €100–€600 per bed, typically €250. That price usually covers the frame, the fill and the labour; ask whether the soil is included.
MORE GUIDES
More DIY guides
Sources — checked October 2026
- Westland — how to make a raised garden bed: site, timber, layers, settling
- Westland — the benefits of mulching
- HSA — manual handling of loads, guide to the General Application Regulations
- Planning and Development Regulations 2001, Schedule 2 — exempted development, Class 6
- mywaste.ie — garden waste
- mywaste.ie — plastic plant pots
- Quickcrop — price check: easy-assemble raised bed kit 180 × 120 cm
- TJ O'Mahony — price check: timber sleepers
- Woodie's — price check: topsoil, manure and bark