How to Lay a Lawn on New Build Soil

Turf gives you an instant lawn. Lay it on a Saturday, and by Monday you have a green garden. It's more expensive (£3-£6 per m²) but the instant gratification is hard to beat. It's also more forgiving of imperfect soil — the turf brings its own root system and a thin layer of topsoil.

Seed is cheaper (£0.50-£2 per m²) but takes 6-8 weeks to establish. You need to keep it watered, keep off it, and protect it from birds. The result can be just as good as turf — sometimes better, because you can choose a seed mix specifically suited to your garden's conditions (shade, sun, clay soil).

For new builds: Turf is the safer choice. New build soil is often poor quality (more on this below), and turf's instant root system copes better with difficult ground. If budget is tight, turf the areas you see from the house and seed the rest.

This is the part that makes or breaks a new build lawn. Builder's soil is not garden soil. It's typically a thin layer of topsoil over heavily compacted subsoil mixed with brick rubble, concrete chunks, cable ties, and packaging waste. If you lay turf straight onto this, your lawn will:

• Turn yellow within 6 weeks (no nutrients, compacted roots)
• Become waterlogged in rain (no drainage through compacted subsoil)
• Develop bare patches where rubble sits just below the surface
• Feel lumpy and uneven as debris shifts

What to do instead:

1. Rotavate the soil to a depth of 15-20cm. You can hire a rotavator for £40-£60 per day. This breaks up the compaction.
2. Remove all rubble and debris. Rake through the rotavated soil and pick out anything that isn't soil. You'll be amazed (and appalled) at what you find.
3. Add topsoil. Most new builds need at least 5-10cm of fresh topsoil across the lawn area. Budget £25-£40 per bulk bag (1 bag covers roughly 1m² at 10cm depth).
4. Level and firm. Rake the topsoil level, then firm it by treading across the whole area with shuffling steps. Rake again. Repeat until it's flat and firm but not compacted.
5. Add a pre-turf fertiliser. A general purpose lawn fertiliser raked into the top 2cm gives the turf a boost. £10-£15 for enough to cover most new build lawns.

1. Order your turf to arrive on laying day — turf deteriorates fast once cut. Measure your area and add 5% for cutting waste.
2. Start at the edge furthest from the house. Lay the first row in a straight line along a border or string line.
3. Butt each roll tight against the previous one. No gaps, no overlaps. Stagger the joins like brickwork.
4. Work forwards across the area, standing on a plank placed on the freshly laid turf to spread your weight.
5. Cut edges with a sharp knife where the turf meets borders, paths, or fences.
6. Water immediately. Give the whole lawn a thorough soaking — the soil underneath should be wet to 5cm depth.

Best: March to May or September to October. The soil is warm enough for roots to establish, and rainfall helps keep it watered naturally.

Acceptable: Any time except frozen ground. Summer laying is fine but you'll need to water heavily (twice daily in hot weather).

Avoid: December to February if the ground is frozen or waterlogged.

• Weeks 1-2: Water daily. Lift a corner to check the soil underneath is moist. Don't walk on it.
• Weeks 3-4: Reduce watering to every other day (unless it's hot). The turf should be rooting into the soil — gently tug a corner to check.
• Week 5-6: First mow on the highest setting. Remove no more than a third of the grass height. Water weekly.
• Week 8: The lawn is established. Mow normally, water in dry spells, and enjoy your green garden.

• Skipping soil prep — the #1 reason new build lawns fail. It's boring work but it's essential.
• Not removing rubble — if you can feel stones when you walk on the lawn, they'll kill the grass above them.
• Laying turf on bone-dry soil — water the prepared soil the day before laying so the turf roots have moisture to grow into.
• Walking on it too soon — give it at least 3 weeks before using it normally.
• Not watering enough in the first fortnight — new turf needs water every single day initially. No exceptions.