Category: Lawn Care & Lawn Repair Read time: 8 min read

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8 min read Intermediate Read Best read in All year
Clay soilChalk soilSandy soilBuckinghamshireOxfordshireBerkshire

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Published

3 April 2026 · 8 min read

Last reviewed

19 July 2026

Reviewed by a senior CGM team member.

The short answer

Quick Answer

Aeration relieves compaction by creating holes in the lawn. Overseeding sows new grass seed into the existing lawn. Top dressing adds a thin layer of soil mix to improve the surface. Together, they form the core of lawn renovation. Cost: 200 to 500 pounds for a professional treatment on a 50 sqm lawn in the Chilterns.

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Aeration

What it does

Aeration creates holes in the lawn to relieve compaction, improve drainage and let air, water and nutrients reach the roots. On clay soils in Aylesbury, Bicester and Didcot, aeration is the single most beneficial treatment you can do.

When to do it

Spring (March to May) or autumn (September to October) when the soil is moist but not waterlogged. On chalky Chiltern soils, spring aeration is ideal because the soil is already free-draining. On clay soils, autumn aeration is better because spring soil is often too wet.

How to do it

Use a garden fork for small lawns, or hire a hollow-tine aerator for larger lawns. Push the tines 10cm deep every 10cm. Hollow-tine removes plugs of soil, which is more effective than solid-tine on compacted clay.

Cost

1.50 to 3 pounds per square metre professionally, or 50 pounds per day to hire an aerator.

Overseeding

What it does

Overseeding sows new grass seed into the existing lawn to thicken it, fill bare patches and introduce improved grass varieties. For Chiltern gardens, overseeding with drought-tolerant fescues on chalk or hard-wearing ryegrass on clay can dramatically improve lawn quality.

When to do it

Spring (April to May) or autumn (September to October) when the soil is warm enough for germination. On chalky soils around High Wycombe and Amersham, autumn overseeding is often better because the soil retains some warmth from summer.

How to do it

Sow seed at 25g per square metre after scarification and aeration. Rake in lightly and water. Keep moist for 3 weeks. Protect from birds with netting.

Seed choice for Chiltern gardens

Choose a seed mix suited to your conditions. See our lawn planning tool for recommendations, or buy our Chiltern Lawn Care Guide PDFs for full seed mix percentages.

Cost

1 to 2 pounds per square metre including seed.

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Top Dressing

What it does

Top dressing adds a thin layer of soil mix to the lawn surface to improve drainage, level minor hollows and fill aeration holes. On chalky Chiltern soils, top dressing helps build up thin soil over the chalk. On clay soils in the vale, top dressing with sand improves drainage.

When to do it

Spring or autumn, after aeration and before overseeding.

How to do it

Apply a 70/30 sand and soil mix at 3 to 5kg per square metre. Brush it into the surface with a stiff broom. Do not smother the grass. On chalky soils, use a 60/40 soil/sand mix. On clay soils, use an 80/20 sand/soil mix.

Cost

2 to 4 pounds per square metre including material.

How They Work Together

The three treatments work best when done together as part of a lawn renovation:

  1. Scarify to remove thatch and moss
  2. Aerate to relieve compaction
  3. Top dress to improve the surface and fill aeration holes
  4. Overseed to introduce new grass
  5. Feed to help the new grass establish

See our spring lawn renovation guide for the full process.

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Get a Quote for Lawn Renovation

If your lawn in Oxfordshire, Buckinghamshire, Berkshire or Bedfordshire needs aeration, overseeding and top dressing, contact us on WhatsApp.

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Frequently Asked Questions

Can I aerate and overseed on the same day?

Yes. Aerate first, then overseed. The seed falls into the aeration holes and germinates well.

Do I need top dressing every year?

No. Top dressing every 2 to 3 years is sufficient for most lawns. Aeration and overseeding can be done annually.

What is the best seed for chalky Chiltern soil?

A drought-tolerant fescue and ryegrass blend. See our lawn planning tool for specific recommendations.

Further Reading

Estate Note

On mature lawns, check for leatherjackets and chafer grubs before scarifying. Established turf recovers more slowly than newly seeded areas, so adjust the renovation intensity accordingly.

Useful next steps

Put this advice into practice

Use the relevant CGM tool or follow a related guide, then send us a few photos if you would like a tailored plan.

Open the lawn recovery toolOpen guide Why is my lawn full of moss?Open guide Aeration, overseeding and top dressing explainedOpen guide
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Sources and citations

This article draws on the following sources. Specific claims are cited inline where relevant.

  1. CGM field records (2025-03. Site observations from gardens across Oxfordshire, Buckinghamshire, Berkshire and Bedfordshire.
  2. Royal Horticultural Society (2024). RHS Gardening Advice and Plant Finder. Available at rhs.org.uk.
  3. Met Office (2024). Regional climate averages, South East England. Available at metoffice.gov.uk.
  4. British Geological Survey (2024). Soil parent material data for the Chilterns and Thames Valley. Available at bgs.ac.uk.