Artificial Grass Calculator

How to budget for artificial grass

Artificial grass is sold in fixed roll widths, so the purchased area can exceed the measured lawn. A durable installation also depends on excavation, an aggregate base, edging, membrane, joins and finishing—not simply the turf price.

Use the calculator for a quantity-led starting point, then check it against the chosen manufacturer's technical information and a supplier quote. Product dimensions, coverage and pack sizes change, and a low advertised unit rate can be offset by delivery, minimum orders or accessories. Keep the measurements, quantity calculation and cost assumptions together so they can be updated without remeasuring the project.

Typical UK artificial grass prices

The figures below are illustrative UK ranges as at September 2026, including VAT where normally charged. Supply-only means the main named material and does not automatically include preparation, delivery, accessories or waste. Supplied-and-fitted ranges are broad consumer budgeting figures, not quotations; London, difficult access and unusually small jobs can cost more.

Prices are shown per m² as appropriate. Compare like with like: clarify VAT, delivery, removal of old material, preparation, finishing and guarantees. A contractor rate may include several of these, while a retailer's headline price generally does not. Obtain current local prices before ordering or agreeing work.

Worked example: calculation step by step

Take a rectangular lawn 6m long by 4.3m wide. Its visible area is 6 × 4.3 = 25.8m². Four-metre roll stock cannot cover the 4.3m width in one piece. One workable plan is a 4m-wide strip and a 0.3m strip, both 6m long; suppliers normally charge the ordered cut area, so confirm how the narrow strip is supplied.

Applying 10% planning waste gives 25.8 × 1.10 = 28.38m². At £24 per m², the grass allowance is £681.12. Add £110 for membrane, tape, adhesive and pins, giving £791.12 before groundwork.

If excavation and base preparation are quoted at £32 per m², add 25.8 × £32 = £825.60. The working installed budget becomes £1,616.72, or about £62.66 per actual square metre. Edging, drainage repairs and removal of excavated soil can increase it.

What drives the cost?

• Pile height, density, backing and warranty. Ask whether this is included in a price and what assumption has been made. A change here can affect material quantity, labour time and the supporting work, so it deserves its own budget line rather than being hidden in a general contingency.
• Roll width, orientation and number of joins. Ask whether this is included in a price and what assumption has been made. A change here can affect material quantity, labour time and the supporting work, so it deserves its own budget line rather than being hidden in a general contingency.
• Excavation depth and existing ground condition. Ask whether this is included in a price and what assumption has been made. A change here can affect material quantity, labour time and the supporting work, so it deserves its own budget line rather than being hidden in a general contingency.
• Drainage, edging and aggregate base specification. Ask whether this is included in a price and what assumption has been made. A change here can affect material quantity, labour time and the supporting work, so it deserves its own budget line rather than being hidden in a general contingency.
• Access for removing spoil and delivering stone. Ask whether this is included in a price and what assumption has been made. A change here can affect material quantity, labour time and the supporting work, so it deserves its own budget line rather than being hidden in a general contingency.

Project scale also changes the unit cost. A contractor still has travel, setup and administration on a small job, while larger orders may attract delivery efficiencies. Geography matters too: labour and parking are commonly higher in London and parts of the South East, while remote deliveries can carry their own premium. Seasonal demand may change lead times even where the quoted rate is stable.

Wastage allowance

Allow 10% for a fairly regular lawn so the installer can trim cleanly against edging and keep all pile facing one direction. Five percent may work on a rectangle designed around the roll width; irregular curves and narrow returns can need 12–15%. Fixed roll widths can create additional paid-offcut beyond a simple percentage, so make a cutting plan as well.

Apply waste to quantity before rounding to whole packs, boards, bags or rolls. Rounding first and then adding a percentage can either overbuy or leave an unusable fraction. If unopened stock is returnable, check the return window and batch restrictions. Do not assume every surplus item can be returned: special orders, mixed products and cut lengths are commonly excluded.

Measure and plan before buying

Draw the area and label every dimension instead of relying on one length and width from memory. Split L-shaped or stepped spaces into rectangles, calculate each one, and add the results. Measure in the same unit throughout. Recheck the narrowest access, floor levels, corners and fixed obstacles because these can determine product size, installation sequence or whether specialist equipment is needed.

Read the technical sheet before substituting one product for another. Two items sold for the same purpose may have different coverage, fitting centres, thicknesses or base requirements. Check compatibility between the main material and its fixings, adhesive, membrane or substrate. Manufacturer instructions normally take priority over a general calculator and may be required to preserve a warranty.

DIY budget versus a fitted quote

A DIY total should include consumables, personal protective equipment, tool hire, delivery and disposal, not only the finish material. It is sensible to keep a separate contingency of around 5–10% of the complete budget for discoveries and price movement. That contingency is different from material waste: wastage buys enough physical product, while contingency protects the cash budget.

For professional work, seek an itemised written quote. It should identify preparation, material specification, quantity, waste ownership, access assumptions, protection, cleanup, disposal, VAT, payment stages and guarantee. Ask what would count as a variation. Comparing itemised scopes is more reliable than choosing the lowest total where important work may be omitted.

Using this estimate responsibly

The result is a planning estimate, not a structural design or site survey. Hidden defects, moisture, unsuitable ground and regulated work cannot be diagnosed from dimensions alone. Confirm structural, fire, electrical, ventilation and planning requirements with a suitably competent person where they apply. Stop and investigate if the existing surface is damp, unstable or contaminated.

Save the exact product details used in the calculation, including pack coverage and unit price. When a quote or retailer price changes, update that input rather than altering the measured area. This makes the estimate auditable and helps distinguish a genuine price change from a quantity error.

Frequently asked questions