Raised Beds & Planters: Build & Cost

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

Reclaimed railway sleepers are often creosote-treated, and the REACH restrictions that still apply in Great Britain bar creosote-treated wood from gardens where there is a risk of frequent skin contact and from containers used for growing plants.¹

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: 6 × 2.4 m lengths of 150 mm × 38 mm treated softwood (four for the two-board-high long sides, two cut in half for the ends), plus corner posts, approximately £55–£90.
• Fixings (screws, corner brackets): £5–£10.
• Total materials: £60–£100.
• 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:

Labour rates for garden landscaping typically 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.

Mushroom compost is cheap, but it can be alkaline, so it suits vegetable beds better than beds for acid-loving plants.²

For a set of three 2.4 m × 1.2 m × 0.3 m beds, you need roughly 2.6 m³ of fill: at a 70:30 mix of screened topsoil and bagged compost at the prices above, budget roughly £245–£385 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

When using treated timber, confirm it is treated to Use Class 4 (UC4), the class for timber in contact with the ground; UC3 is only for exterior timber kept above ground.³ Avoid reclaimed timber that may have been treated with older copper/chromium/arsenic (CCA) preservatives in edible growing contexts: CCA-treated wood may now be sold only for professional and industrial uses where skin contact by the general public during its service life is unlikely.¹

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: Domestic raised beds very rarely need planning permission; see permitted development for the general rules. If a masonry bed is built as part of a boundary wall, the permitted development height limits for walls apply: 1 metre next to a road used by vehicles and 2 metres elsewhere.⁴

The rules in this note are those that apply in England. Scotland, Wales and Northern Ireland have their own building standards and permitted development rights.