By the Home Tennis Court UK — The Complete Buyer & Build Guide Team · Updated May 2026 · Independent, reader-supported

How to Prepare Ground for a Home Tennis Court in the UK

Getting the ground right is the difference between a tennis court that lasts 15 years and one that develops cracks within three. It's the foundation nobody sees, which is precisely why skipping it causes problems everyone hears about. If you're planning a home court in the UK, ground preparation typically costs £3,000–£8,000 depending on site conditions, but it's where cutting corners shows up fastest.

Start with a Site Survey

Before moving a single load of gravel, you need to know what's underneath. A soil survey will identify clay content, drainage patterns, and existing compaction—all things that affect how your court performs.

Ideally, hire a surveyor to take samples across the intended court area (about £400–£600). They'll tell you the soil type (clay, sand, silt mix), moisture content, and bearing capacity. Clay is common in the UK and problematic for courts because it:

• Holds water and becomes unstable when wet
• Shifts with freeze-thaw cycles
• Creates an uneven playing surface over time

If you can't justify a formal survey, dig test holes at several points around your proposed court. You're looking for how quickly water drains (ideally 2–5cm per hour for a tennis court) and whether you're hitting clay, chalk, or sand within the first 30cm. Heavy clay drainage means you'll need a more robust sub-base.

Assess the Slope and Drainage

Tennis courts need a slight slope—roughly 1 in 150 gradient—to shed water without creating puddles or running off one end. A flat site isn't ideal; a gently sloping site is actually preferable because you can work with the natural fall.

Use a laser level or a long straightedge to check the existing gradient across your proposed court area. If the slope is steeper than 1 in 80, you're looking at significant earthworks: cut and fill to regrade. If it's nearly flat, minor levelling is probably enough.

For drainage, observe how water moves after rain. Does it pool in certain areas? Does it shed quickly? If water sits for more than a few hours, you likely need land drains or a deeper permeable sub-base. UK clay sites often require perforated drainage pipes laid under the court, running to a soakaway or low point.

Prepare the Ground Layer

Once you've surveyed and graded, preparation involves removing debris and compacting the natural soil to create a stable base. Steps:

1. Remove topsoil and vegetation. Strip back to bare subsoil—typically 100–150mm deep. Keep any good topsoil aside if you want to re-landscape around the court afterwards.

1. Remove large stones, roots, and obstructions. Even buried rubble or old brick will cause uneven settling over time.

1. Compact the existing subsoil. Use a vibrating plate compactor or roller. This is crucial: uncompacted soil will settle unevenly, leading to bumps and dips. Compact in layers if the subsoil is deeper than 150mm.

1. Check levels and regrade if needed. Fill low spots with crushed stone, not soil, because soil compacts further and will dip again. Use approved specification stone (MOT Type 1 or equivalent).

Sub-Base Depth: The Critical Layer

The sub-base sits under the actual court surface and determines long-term stability. For a UK domestic court, spec depth is usually:

• 150mm for sand or sand-silt soils (free-draining areas)
• 200–250mm for clay sites (poor drainage)

Use a permeable stone: crushed granite, Type 1 MOT stone, or recycled asphalt, graded 0–40mm. The stone must be compacted in layers (75mm lifts, each compacted separately) to achieve density. A loose sub-base will settle, especially under the wear patterns of regular play.

On clay sites with poor drainage, consider perforated land drain pipes laid at the base of the sub-base, running to a soakaway outside the court area. This prevents water trapping underneath, which is what causes winter-season deterioration.

Contractor vs DIY

DIY is possible if:

• Your site has good natural drainage (sandy soil, good slope)
• The area is small (under 300 m²)
• You have access to a vibrating plate compactor (hire cost: £30–£50 per day)
• You're comfortable doing level checks with a straightedge and spirit level

You'll still spend 4–6 full days on ground prep alone.

Hire a contractor if:

• Your site is clay-heavy or flat
• You need land drains installed
• The site has significant slope and needs cut/fill
• You want the certainty of a warranty (most contractors guarantee their sub-base for 10 years)

A specialist sports-ground contractor will also compact more effectively with machinery than manual methods allow. Labour typically costs £800–£2,000 depending on complexity.

Final Checks Before the Surface Goes Down

Before your chosen court surface (hard court, artificial grass, or macadam) is installed:

• Take photos of the prepared ground level across the entire area
• Use a straightedge to check for dips or high spots (no more than 10mm variation over 3 metres)
• Check drainage with a hose: water should shed within minutes, not pool
• Allow the compacted sub-base to settle for 2–4 weeks before surfacing goes down (contractor-prepared sites sometimes longer)

Getting ground preparation right costs more upfront but prevents expensive resurface work within five years. It's the foundation investment that stops you rebuilding your court from scratch.