Lawn Aeration
Calculator UK

Hollow tine aeration uses a tool with hollow cylindrical tines that physically remove small cores of soil (typically 9–19mm diameter, 75–150mm deep) from the lawn, leaving open holes behind. This is the most effective method for relieving serious compaction because it actually removes compacted soil from the profile rather than just displacing it. Solid tine aeration uses solid spikes that are pushed into the soil without removing any material — the soil is compressed sideways around the tine. Solid tine is faster, less disruptive to the lawn surface, and perfectly adequate for maintenance aeration on lightly compacted loam soils. For clay soils and heavily compacted lawns, hollow tine is significantly more effective because the open channels allow topdressing, water and nutrients to penetrate deep into the root zone.

At the standard recommended spacing of 10cm (centre-to-centre in both directions), you achieve 100 holes per m². This is the UK benchmark for routine annual hollow tine aeration. For seriously compacted or clay-heavy lawns, reducing the spacing to 7.5cm gives approximately 178 holes per m² (intensive treatment). For a light spring maintenance top-up on a well-maintained loam lawn, 15cm spacing giving 44 holes per m² is adequate. The percentage of the lawn surface perforated at standard 10cm spacing with a 12mm tine is approximately 11.3% — enough to make a meaningful improvement to water infiltration without excessively disrupting the turf.

The ideal time for hollow tine aeration in the UK is September to October — the beginning of the autumn renovation window. The soil is still warm from summer (above 8–10°C), which supports rapid grass recovery; the lawn has had a full growing season to build root reserves; and autumn rains are beginning to raise moisture levels, helping the soil return to normal quickly. Solid tine aeration can additionally be done in spring (March–April) on lawns that need more frequent treatment. Never aerate during drought when the soil is hard and dry — the tines cannot penetrate properly and the grass is under additional stress. Similarly, avoid aerating on frozen or waterlogged ground.

Professional hollow tine aeration costs in the UK range from £30–£50 for small lawns (under 50m²), £60–£100 for medium lawns (100–150m²), and £100–£200+ for large lawns (250m²+). Solid tine aeration is typically 20–30% cheaper than hollow tine for the same lawn. Hiring a powered aerator yourself costs £40–£80 per day — for a medium lawn this is the most cost-effective approach, covering the work in 1–2 hours. National lawn care companies (TruGreen, GreenThumb) include aeration as part of their annual programme packages rather than offering it as a standalone service. All professional prices are ex. VAT; 20% VAT applies to registered businesses.

The correct UK autumn renovation sequence is: mow → scarify → hollow tine aerate → topdress → overseed → fertilise. Scarifying is done first because it removes the thatch layer that would otherwise clog the hollow tine machine and prevent good soil penetration. Aerating after scarifying also means the tines can penetrate deeper and more cleanly. Topdressing is then applied immediately after aeration so the material falls directly into the open hollow tine holes, maximising the structural improvement. This combined sequence gives the best possible results — each stage enhances the effectiveness of the next.

After hollow tine aeration, the lawn will be covered in small cylindrical soil cores lying on the surface. You have two options: (1) Leave them to dry for 1–2 days, then break them up with a stiff brush or drag mat and brush the crumbled material back into the lawn — the organic matter and fine soil returns to the surface; or (2) Rake the cores off the lawn and dispose of them (or add to compost) before applying topdressing. Option 2 is preferred when you are immediately applying topdressing and overseeding, as it gives a cleaner surface for the new materials. Option 1 is a quicker no-waste approach for standalone aeration without subsequent renovation work.

For a typical UK family lawn with moderate foot traffic on loam soil, hollow tine aeration once per year in autumn is the standard recommendation. Lawns with heavy use (children, dogs, frequent entertaining), clay-heavy soils, or significant compaction may benefit from hollow tine aeration twice per year — once in autumn and a solid tine pass in spring. Fine ornamental lawns may be aerated more frequently (solid tine 3–4 times per year) to maintain the precise drainage characteristics required. Sandy, free-draining soils that do not compact readily may only need aeration every other year. The simplest guide is the screwdriver test: if you cannot push a screwdriver to 10cm depth with moderate hand pressure, the soil needs aerating.

Aerator shoes (spike sandals strapped over regular shoes) are a cheap and convenient solid tine aeration option for small to medium lawns, but their effectiveness is limited. The short spikes (typically 50mm) create shallow penetration, and the random walking pattern often misses areas while over-treating others. For a genuinely compacted UK lawn, a proper hollow tine aerator (hire or buy) produces dramatically better results. Aerator shoes are suitable for: maintaining an already well-aerated loam lawn, giving a light spring top-up treatment, or treating a small patio lawn economically. They are not effective for clay soils, severely compacted ground, or as the primary autumn renovation aeration treatment.

No — aerating a waterlogged or very wet lawn is counterproductive. When the soil is saturated with water, the tines smear the sides of the holes rather than creating clean channels, and clay particles migrate to seal the hole walls, actually reducing long-term drainage. The lawn also suffers structural damage when equipment is used on very wet ground. Wait until the lawn surface has dried out enough that it does not stick heavily to boots. The ideal soil moisture for aeration is similar to a wrung-out sponge — moist enough for tines to penetrate easily but dry enough that the soil breaks cleanly around the tine without smearing. If your lawn is persistently waterlogged, consider installing a soakaway or French drain system in addition to regular aeration.

The most commonly used hollow tine size for residential UK lawns is 12mm diameter — this is the standard size fitted to most hire machines and is suitable for all soil types and lawn sizes. Smaller tines (6–9mm) are used on fine ornamental lawns where minimal disruption is required. Larger tines (16–19mm) are used by professional contractors on commercial or sports turf where maximum soil removal per pass is needed. Larger tines remove more soil per hole (increasing the improvement per pass) but also cause more surface disruption and a longer recovery period. For a standard UK garden lawn, 12mm × 75–100mm depth with 10cm spacing is the optimal specification for a good result within a manageable recovery time.

Yes — powered hollow tine aerators are widely available to hire from UK tool hire companies including HSS Hire, Speedy Hire, Travis Perkins Tool Hire, Jewson, and many independent local hire centres. Day hire rates typically range from £40–£80 for a petrol self-propelled hollow tine aerator, or £35–£60 for a walk-behind electric model. A standard hire machine will aerate approximately 80–100m² per hour, making a 150m² garden a 2-hour job. Book in advance for September and October as demand is high during the autumn renovation season. When hiring, confirm that hollow tine cassettes are included (not just solid tine spikes) and ask about the tine diameter and maximum penetration depth before collecting the machine.