Raised beds extend the growing season, improve drainage, reduce weed pressure, and make kitchen gardens far more manageable. They suit virtually any garden — from a small urban patio using a single planter to a large plot with a grid of vegetable beds. The main decisions are material, height, and whether you build them yourself or bring in a landscaper.
Costs vary enormously depending on what you build with. A simple softwood frame knocked up in an afternoon costs under £100 in materials; a bespoke galvanised steel or hardwood sleeper installation can run to several hundred pounds per bed. This guide covers every option with realistic 2026 UK pricing.
Common Materials Compared
| Material | DIY Material Cost | Longevity | Appearance | Notes |
|---|---|---|---|---|
| Treated softwood (C24 graded) | £30–£80 per bed | 8–15 years | Traditional | Widely available, easy to cut and screw |
| Oak or hardwood sleepers | £80–£200 per bed | 20–30+ years | Premium | Heavy; must be new railway sleepers (old ones may contain creosote) |
| Recycled plastic/composite | £80–£250 per bed | 25+ years | Modern | Splinter-free, low maintenance, fades over time |
| Galvanised steel (Corten or zinc-coated) | £100–£400 per bed | 20–30+ years | Industrial/contemporary | Heats up in sun; excellent for modern gardens |
| Brick or block | £150–£600 per bed (materials) | Permanent | Formal | Requires foundations if tall; highest labour cost |
| Concrete block (rendered) | £100–£400 per bed | Permanent | Can be decorative | Good for very large beds |
Typical Dimensions and Heights
Standard raised bed sizes are dictated by reach — you should be able to work the centre of the bed from either side without stepping in.
- Width: 1.0–1.2 m maximum for beds accessible from both sides; 0.6 m if against a fence.
- Length: 2.4 m or 3.6 m are common because they align with standard timber lengths (2.4 m planks), minimising waste.
- Height: 20–30 cm is sufficient for most vegetables; 40–60 cm suits root vegetables (carrots, parsnips) or those who prefer to work without kneeling; 75–90 cm creates a working-height planter suitable for those with limited mobility.
Taller beds require more fill, which is often where the real cost lies on a large project.
DIY vs Contractor-Built Costs
DIY
For a standard 2.4 m × 1.2 m × 30 cm treated softwood bed:
- Timber: 4 × 2.4 m lengths of 150 mm × 38 mm treated C16/C24, plus corner posts — approximately £35–£60.
- Fixings (screws, corner brackets): £5–£10.
- Total materials: £40–£70.
- Time: 2–4 hours including measuring, cutting, and assembly.
For oak sleeper beds (2.4 m × 1.2 m × two-sleeper high, roughly 45 cm):
- Sleepers: 6–8 new oak sleepers at £20–£35 each — £120–£280.
- Fixings or rebar: £15–£25.
- Total materials: £135–£305.
- Time: half a day (sleepers are heavy — 50–80 kg each).
Contractor-Built
A landscaper will charge for labour plus a markup on materials. Expect:
| Bed Type | Size | Contractor-Built Cost (supply + fit) |
|---|---|---|
| Treated softwood, single | 2.4 × 1.2 × 0.3 m | £200–£350 |
| Treated softwood, set of 3 | 2.4 × 1.2 × 0.3 m each | £500–£900 |
| Hardwood sleeper, single | 2.4 × 1.2 × 0.45 m | £400–£700 |
| Galvanised steel, single | 2.0 × 1.0 × 0.45 m | £350–£650 |
| Brick-built, single | 2.4 × 1.2 × 0.45 m | £500–£1,000+ |
Labour rates for garden landscaping run £200–£350 per day in London and the South East, £150–£250 elsewhere.
Fill Costs: Topsoil and Compost
The fill is often the biggest single cost, particularly for tall beds. The standard advice is a 70:30 or 60:40 mix of topsoil to compost or well-rotted organic matter.
A 2.4 m × 1.2 m × 0.3 m bed holds approximately 0.86 m³ of fill.
| Fill Type | Cost per m³ (delivered, bulk bag) | Notes |
|---|---|---|
| Screened topsoil (general) | £60–£100 | Suitable for most vegetables |
| Premium vegetable topsoil | £80–£130 | Higher organic content |
| Garden compost (bagged) | £150–£250 | Expensive per m³; usually blended in |
| Mushroom compost | £40–£80 | Low pH — good for brassicas, avoid acid-lovers |
| Blended raised bed mix | £90–£160 | Ready-to-use, convenient |
For a set of three 2.4 m × 1.2 m × 0.3 m beds, you need roughly 2.6 m³ of fill — budget £200–£350 delivered.
For taller beds (0.6 m high), the Hugelkultur approach can save on fill costs: pack the base third with logs, branches, and leaf matter, which decompose over time and provide nutrients. Top with a 40 cm layer of topsoil and compost mix.
Drainage Considerations
Raised beds inherently drain better than flat ground, but a few steps ensure they do not waterlog:
- Base layer: For beds on impermeable surfaces (paving, concrete), add a 5–10 cm layer of coarse gravel or crushed stone at the base before filling. On lawn or soil, cut through any turf and loosen the base.
- Weed membrane: Line the base (not the sides) with a permeable weed membrane to suppress weeds from below while allowing water to drain freely. Avoid impermeable plastic — it causes pooling.
- On patios: If drainage is critical, drill drainage holes through the sides near the base, or use a planter with built-in feet to allow water escape.
- Tall beds on compacted clay: Consider breaking up the clay base with a fork before installing the bed, or lay a drainage layer of 10–15 cm rubble and gravel.
Material Longevity
| Material | Expected Lifespan | Maintenance Required |
|---|---|---|
| Treated softwood (UC3/UC4 rated) | 8–15 years | Annual check for rot; treat cut ends |
| Untreated softwood | 3–6 years | Not recommended for ground contact |
| Hardwood sleepers (new oak) | 20–30+ years | Minimal; oil occasionally if desired |
| Composite/recycled plastic | 25+ years | Wipe down; UV fading over time |
| Galvanised steel | 20–30 years | Check for rust at cut edges; touch-up paint |
| Corten steel (weathering steel) | 40+ years | Develops a protective rust patina — no treatment needed |
| Brick or block | Permanent | Point mortar every 10–15 years |
When using treated timber, confirm it carries a UC3 or UC4 rating — these are appropriate for ground contact. Avoid timber treated with older copper/chromium/arsenic (CCA) preservatives in edible growing contexts; modern ACQ and copper azole treatments are considered safe once dry.
Practical Tips Before You Build
- Placement: Site beds to receive at least 6 hours of sun per day for most vegetables. North-facing beds suit leafy greens and herbs.
- Path width: Leave at least 60 cm between beds for comfortable working access; 75 cm if you use a wheelbarrow.
- Irrigation: Install drip irrigation or soaker hose loops before filling — far easier than retrofitting.
- Height for accessibility: For wheelchair or standing-height use, design to 75–90 cm tall with a minimum 45 cm clear knee space below if a sit-to-work approach is needed.
- Planning permission: Raised beds are permitted development in most residential gardens. If you are building permanent structures over 30 cm in height against a boundary wall, check with your local authority, though domestic vegetable beds very rarely trigger any planning requirement.
