Turf or Grass Seed? Cost and Timing Compared

The short answer

Sow seed if you can wait a few months and want to spend less. Lay turf if you need a usable lawn within weeks and can pay roughly three to six times more per square metre. On the prices we read on 8 October 2026, across lawns of 20 to 100 m², seed works out at about £1 to £2 per m² of lawn and turf at about £3.64 to £9.29. A small lawn sits at the top of each range and a large one at the bottom, so compare like with like: for the 40 m² lawn in the sums below it is about £1.46 for seed against £4.71 to £6.81 for turf.⁴⁵⁶

The ground work is the same either way, and both do best in autumn. The RHS puts it plainly: seed is cheaper and gives you more choice of mix but takes longer, and turf is the quick option that costs more.¹²

Turf and seed, side by side

One row per decision. The cost row is our own sum for a 40 m² lawn, worked out below.

What each one costs per square metre

Take a 40 m² lawn, 8m by 5m. Turf rolls cover about 1 m² each, and suppliers advise ordering at least 5% extra for trimming.⁴⁶ That is 40 × 1.05 = 42 rolls.

• Rolawn Medallion Turf: £6.49 a roll at 40 to 99 rolls. 42 × £6.49 = £272.58.⁴
• Topsoil.co.uk Garden Turf: £4.49 a roll at 40 to 79 rolls. 42 × £4.49 = £188.58.⁶
• Rolawn Medallion Lawn Seed: one 1kg box covers about 28 m² of new lawn, so 40 ÷ 28 = 1.43 boxes. Buy 2 at £29.24 each = £58.48.⁵

So the seed bill is about £58 and the turf bill is £189 to £273. Rolawn says it adds a 6.5% fuel surcharge to every order, which takes its turf to about £290 and its seed to about £62.⁴⁵ The same turf order weighs 630 to 840kg (42 rolls at 15 to 20kg), so it arrives on a pallet, not in the boot.

The gap changes with the size of the lawn, because turf prices fall as the order grows and seed prices fall by the box:

These are our own sums from the 8 October 2026 price lists, before the Rolawn surcharge and before topsoil and feed, which cost the same whichever you choose. Topsoil.co.uk sets a 10-roll minimum, and the Rolawn price list starts at 10 rolls, so a very small patch is a seed job anyway.⁴⁶ Prices move, so check the supplier page on the day. The turf calculator and the grass seed calculator do the roll and box counts for your own lawn.

How long before you can use the lawn

This is where turf earns its price. The RHS says you can use a turfed lawn a few weeks after it is laid, and recommends the first mow, with the blades set high, at about three weeks, once a gentle tug shows the turf has rooted.²

Seed is slower. The RHS says seedlings show a week to ten days after sowing, and then asks you to keep traffic to a minimum for roughly eight months. Sown in autumn, avoid using it before June. Sown in spring, go easy until late autumn.¹ Rolawn puts the whole job at several weeks or even months to reach a fully grown lawn.¹⁰

If children, a dog or a party date are the deadline, that gap decides it. If the garden is going to be a building site for a while yet, it does not matter.

Best months for each

Seed: September to November, or March to April. If you have the choice, take early autumn, because the seedlings root in before the first hard frosts. Spring-sown grass puts more of its energy into flowering and roots in more slowly.¹

Turf: mid-autumn to early spring, on days when the soil is not too wet or frozen. The RHS says to avoid mid-spring to early autumn, because new turf struggles in the heat and needs repeated watering.²

One open disagreement: Rolawn says its turf can be laid all year except on frozen ground, provided you roll it out at once in spring and summer.⁴ Both sources agree that summer laying costs you more water and more attention. We would follow the RHS window unless a deadline forces the issue.

Early October is inside the sowing window and close to the start of the turf window. Soil warmth matters as much as the date, so read what temperature grass needs to grow for the 7°C germination figure and how the growing season runs, and the frost date calculator if you are sowing in spring.

Turf or seed in shade

Neither beats the light. The RHS says most turf grasses need four to six hours of full sun a day, and that lawns under heavy canopies, such as oak, beech or conifer, seldom thrive, because those trees can cut out up to 95% of summer sunlight.³ In deep shade, even a shade-tolerant grass will struggle, and the RHS suggests shade-loving plants instead.

In light to medium shade, the choice of product matters more than turf versus seed. Shade mixes are mostly fine-leaved fescues and browntop, sold as both seed and turf.¹³ Seed gives you the wider choice, and Rolawn rates its Medallion turf as moderately shade tolerant.⁴ Under deciduous trees, sow while the branches are bare, in late autumn or early spring.³ Then mow shaded grass at 6cm or higher.

The prep is the same job

The RHS says soil preparation is just as important for turf as for seed.² Clear perennial weeds, dig, let the ground settle, then tread it firm and rake it level. Seed ground only needs digging to about 20cm if the soil is hard and compacted. Turf ground should go to 20 to 25cm. Leave dug soil to settle for at least a few days, and ideally five to six weeks.¹²

Two of the questions people search sit here:

• How much topsoil for turf? The same as for seed: at least 10cm, which is 100 litres per m². Our topsoil guide for a new lawn has the depths and the sums, and it tells you to measure what you already have before you buy.
• Should you cover grass seed with soil? Only lightly. The RHS says to rake over the sown area so most of the seed is covered.¹ For the depth, the ratio and patch repairs, see mixing grass seed with topsoil.

Water restrictions and supply in 2026

Both options need steady water while they establish. This year that is a real planning point. The Turfgrass Growers Association reported in July that six water companies had brought in temporary use bans, and in August that 71.3% of England was in drought.⁸⁹

Rolawn says fresh turf is normally allowed a hosepipe for its first 28 days or so. The TGA says the wording varies between companies, and some only cover turf laid before the ban began.⁴⁸ We found nothing in these sources about watering new seed, so check your own water company's rules before you commit to either. The TGA also says growers are under cost pressure and tells buyers to order early.⁹

Which one suits you

Common mistakes

• Trusting the pack coverage. One garden centre lists Johnsons Quick Lawn 425g as covering "up to 20 m²". That is about 21g per m², lighter than the 35g new-lawn rate on the same page. At 35g it covers 12 m².⁷ Buy by the grams per m².
• Leaving turf on the pallet. The RHS says to lay it within 24 hours if you can.² Topsoil.co.uk says same day in warm weather.⁶ Prepare the ground before you book delivery.
• Walking on seed early. Green shoots in ten days do not mean a lawn. The RHS asks for roughly eight months of minimal use.¹
• Forgetting the birds. The RHS suggests fleece, bird tape, or sowing 50% heavier to cover losses. At 35g per m² that is 52.5g.¹
• Buying the cheapest seed. The RHS warns that bargain seed can be full of weed seed or farm-grade ryegrass.¹
• Choosing turf with plastic mesh by accident. The RHS says some growers use it and it causes trouble when you scarify later, so ask before you buy.²
• Putting a fine lawn under a big evergreen. Light, not the product, is the limit.³

Frequently asked questions

Work out your numbers

Once you have picked, the turf calculator gives you the roll count with wastage, and the grass seed calculator gives you the weight of seed. Then the topsoil guide tells you how deep the soil underneath should be.

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Sources and checking notes

Advice was checked against the pages below on 8 October 2026. Prices are what each supplier page showed that day, including VAT where the supplier shows it; lawn seed is zero-rated for VAT. Every total in this guide is our own sum from those prices. Where Rolawn and the RHS differ on summer turf laying, we say so above.

1. Royal Horticultural Society, Starting a lawn from seed.
2. Royal Horticultural Society, How to lay turf.
3. Royal Horticultural Society, Lawns in shade.
4. Rolawn, Medallion Turf (price tiers, roll size and weight, laying advice, 6.5% fuel surcharge).
5. Rolawn, Medallion Lawn Seed 1kg (price per box, coverage, VAT).
6. Topsoil Direct, Garden Turf (price tiers, 10-roll minimum, wastage advice).
7. Waterside Garden Centre, Johnsons Quick Lawn Seed (application rates and pack coverage).
8. Turfgrass Growers Association, TGA calls for consistent 28-day exemption for newly laid turf during water restrictions, 16 July 2026.
9. Turfgrass Growers Association, TGA statement on drought, rising costs and the future of UK turf production, 14 August 2026.
10. Rolawn, Turfing or seeding a lawn: a comparative guide.