Planning Allotment Raised Beds and Working Paths Guide

Illustration of vegetable raised beds with clear access paths

Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. This article contains affiliate links.

Planning an allotment with raised beds and working paths involves balancing growing space with accessibility. By using a bed system rather than traditional open-row cultivation, you can eliminate the need to tread on the soil, which prevents compaction and makes the plot easier to weed. A successful layout lets you reach every part from a path and move equipment comfortably. Check the allotment tenancy rules before ordering permanent edging, imported soil or masonry: permitted structures and materials vary by site. Beds can also be marked at ground level without frames.

Table of Contents

Determining bed dimensions and orientation

The size of your raised beds should be dictated by the reach of the gardener and the requirements of the crops. To avoid stepping into the bed—which defeats the purpose of the system—widths should be kept under 1.5m. Treat 1.5m as an upper reference, not a comfortable width for everyone; around 1.2m or less may suit you better. Test your actual reach from both sides before marking out.

Orientation is critical for maximising sunlight. Most vegetables and fruits require full sun, so beds should ideally be positioned in south- or west-facing areas. For long beds, a north–south alignment can help distribute sunlight, but tall crops still cast shade. Consider their position, neighbouring structures, slope and access together.

Depth varies based on the intended crop:

30cm: Sufficient for strawberries, salad leaves, and dwarf bulbs.
45cm or more: Useful rootable depth for larger crops; include suitable soil below an open-bottomed frame rather than treating this as a minimum edging height.

Designing working paths for accessibility

Paths are the arteries of the allotment; if they are too narrow, moving compost or harvests becomes difficult. Use the RHS 45cm wheelbarrow-path figure only as an initial reference: measure the actual barrow and allow hand clearance. Wheelchair routes need suitable width, surface and turning space for the user; a 1m straight gap alone does not establish accessibility.

The layout should allow for a logical flow between the compost area, the water source, and the beds. By dividing the plot into narrow beds separated by these paths, you create a structured environment where all maintenance, from sowing to harvesting, is performed from the perimeter.

Selecting construction materials

The choice of material affects the longevity of the bed and the budget of the project. Pressure-treated softwood sleepers are a common choice for durability and cost-effectiveness. Hardwoods like oak are more durable but more expensive.

Other options include:

Masonry (Brick or Stone): Extremely durable but requires more skill to build. Check site permission and obtain an appropriate wall and foundation design for the height, ground and retained wet soil.
Recycled Plastic: Rot-resistant; compare current kit prices, size options, bracing and thermal-movement instructions.
Paving Slabs: Vertical slab edging needs secure support designed for the retained soil. Do not assume shallow burial alone makes heavy slabs stable.

Choose materials with a known suitable treatment; avoid old creosote-treated railway sleepers for food-growing beds or edges touched regularly.

Step-by-step construction process

For a modest timber bed, the following outline explains the sequence. Follow the chosen kit or supplier’s actual joint, support and bracing instructions:

Trenching: Dig a shallow trench to the exact dimensions of the bed to house the timbers.
Leveling: Position the first layer of timber and use a spirit level to ensure they are horizontal and diagonally aligned.
Securing: Drill through the end timber into the sleeper behind and secure with heavy-duty coach screws.
Layering: If adding a second layer, overlap the joints of the first layer for strength. Use the specified vertical battens and any intermediate bracing in the corners to secure the layers together.
Base Preparation: Clear persistent weeds and prepare the base without working saturated soil. Preserve useful topsoil and assess drainage; unknown rubble is not a routine drainage solution or appropriate cheap filler.
Filling: Add the soil mixture, firming it down and leaving it to settle for two weeks before planting.

Managing drainage and soil health

Raised beds generally drain faster than open ground, which can lead to quicker drought stress during warm or windy weather. Regular moisture checks—approximately a finger’s depth below the surface—are necessary. Applying a layer of mulch can help conserve moisture.

If building on a hard surface, drainage must be engineered into the design. Timber beds should have drainage holes drilled into the sides. Masonry beds should have gaps left every 45cm in the first two courses, covered with fine wire mesh and gravel to prevent soil from clogging the holes. In these scenarios, the soil mix should be adjusted to include more sharp sand (for example four parts rather than two in the RHS 7:3:2 topsoil/organic matter/sand recipe) to maintain flow.

Integrating crop rotation into the layout

The bed system is ideal for practicing crop rotation, which balances soil nutrients and reduces pests. By assigning each raised bed a letter (e.g., Bed A, B, C, D), you can rotate crop families annually.

One four-group planning example is shown below; it is not a disease-control guarantee. Here, the roots group excludes radishes, turnips and swedes, which belong with brassicas. Keep perennial rhubarb and asparagus outside the annual rotation.

Bed	Year 1	Year 2	Year 3	Year 4
A	Roots	Potatoes	Onions/Legumes	Brassicas
B	Brassicas	Roots	Potatoes	Onions/Legumes
C	Onions/Legumes	Brassicas	Roots	Potatoes
D	Potatoes	Onions/Legumes	Brassicas	Roots

Crops such as pumpkins, courgettes, and sweetcorn can be placed in any bed where space permits, but record them and avoid repeatedly using the same spot. For known soil-borne disease, follow the crop-specific guidance rather than assuming four years is always enough.

Calculate fill before ordering

Use internal length × internal width × planned fill depth, all in metres. A 2.4m × 1.2m bed filled to 0.25m requires 0.72m³, or 720 litres, before settling. Multiply by the number of identical beds and subtract any volume already occupied by suitable soil. Check the supplier’s loose-volume and settling guidance; filling depth is measured below the watering gap at the rim.

Useful products for this job

The links below open Amazon UK product searches. Check the exact item, seller, current price and compatibility before buying.

Spirit level: Essential for ensuring raised bed timbers are horizontal and diagonally aligned during construction. Ensure the length is sufficient for the width of the timber being used. Search Amazon for Spirit level.
Heavy-duty coach screws: Used to securely fasten timber sleepers together at the corners of the beds. Check length against the thickness of the timber to ensure a secure hold without protruding through the other side. Search Amazon for Heavy-duty coach screws.
Soil pH testing kit: Informs plant selection and acidity management; pH alone does not show nutrient levels or determine fertiliser requirements. Choose a soil-specific kit with clear sampling instructions, a suitable pH range and readable results; a display alone does not establish accuracy. Search Amazon for Soil pH testing kit.

Related garden guides

Sources and further guidance

Guidance researched in September 2026. The feature image is an AI-generated illustration. Product guidance is based on published information, not hands-on testing.