What an irrigation system costs to install, and what affects it

You've just received three quotes for an irrigation system and they're wildly different. One contractor has quoted half the price of another, and you're not sure whether you're looking at a genuine bargain or whether someone is cutting corners that will cost you later. Understanding what actually goes into the price — and what gets left out of a cheap estimate — is the only way to compare fairly.

What the price covers, and what it doesn't

An irrigation quote is not just "materials plus labour." A complete installation pulls together several moving parts, and installers bundle them differently. Some quotes include design and site assessment; others charge separately or skip them altogether. Some cover trenching and reinstatement of garden beds; others leave that to you or price it as an add-on. Water source connection — whether to mains supply, a borehole, or a tank — may be included or treated as a separate contract. Soil testing, pressure testing, permits, and system commissioning all affect what you pay, yet not every quote mentions them.

Watch for quotes — at any price point — that omit steps. A contractor might not be sizing the system to your soil type and water pressure, or might be quoting only labour and a basic pipe list without the full array of fittings, filters, and valves a properly functioning system needs — this is a behaviour to check for regardless of what any given quote costs. When comparing numbers, your first job is to identify what each quote actually covers. Ask each installer: Are design and survey included? Does the price cover reinstatement? What happens if we hit rock or a utilities line during trenching? Is pressure testing part of the job, or a cost on top? This is not about being suspicious — it's about understanding whether you're comparing like with like.

The variables that shift the total

Several factors push the price up or down, regardless of the installer's markup. Garden size and layout matter enormously: a small, regular suburban block costs far less to irrigate than a sprawling property with slopes, shaded zones, and scattered garden beds. Complex layouts mean more design work, more varied components, and longer installation time.

Your water source is another big variable. A mains connection is usually straightforward, but a borehole system requires drilling, pump selection, and tank integration — each adding cost. Soil type and water pressure determine what kind of system works: clayey, compacted soil might need drip irrigation to avoid waterlogging, while sandy soil drains fast and may need more frequent watering or different emitter spacing. If your garden has poor pressure or uneven terrain, the system needs more regulators and filters to work properly.

The materials you choose shift costs significantly. Basic rigid PVC pipe is cheaper than flexible kink-resistant hose. Drip systems cost more upfront than sprinkler heads, but they use less water — which matters if you're metered or have restrictions. Smart controllers and soil sensors add to installation cost but can reduce water waste and your bills. An installer quoting on budget materials will look cheaper upfront, and budget materials can still do the job well if matched correctly to your site; one recommending durable fittings and quality emitters will typically cost more and may last longer, so weigh the trade-off against your priorities and budget.

Trenching and reinstatement also vary widely depending on garden condition, surface type, and whether existing features are in the way. Some installers do this themselves; others subcontract. Access and site difficulty change the labour component significantly.

Comparing quotes meaningfully

Before you pick the lowest number, ask each installer to list components separately: pipe, fittings, emitters, pump or pressure tank, controller, labour hours, and reinstatement. Request a site visit or photos so they can quote accurately rather than guessing. Check whether they've assessed your water pressure and flow rate — this is critical and can't be done properly over the phone.

A quote — whatever its price — that leaves design and pressure testing to "after we start" is a red flag. So is one that glosses over soil type or doesn't mention what happens if the garden is uneven or has underground obstacles. A thorough quote takes time because it requires proper site assessment.

When you find a verified installer on Strove, check their reviews and ask them to walk you through what's included and excluded. Don't assume the middle-priced quote is automatically the safest bet based on price alone — what matters is whether the contractor's scope is clearly documented, verifiable, and free of shortcuts, whatever tier they quote in. Any quote, regardless of where it falls, warrants a closer look until you understand exactly what it includes and why.