An automatic irrigation system removes the daily chore of watering and ensures plants receive consistent moisture even during holidays. In an era of hosepipe bans and water restrictions, a well-designed drip irrigation system can actually reduce water use by targeting roots rather than broadcasting water widely.
Drip systems deliver water directly to the root zone of plants through thin perforated tubing and drip emitters. This is the most water-efficient system and the best for raised beds, borders, and kitchen gardens.
Components:
Main supply hose connected to an outdoor tap
Pressure reducer (essential for most drip systems)
Manifold for splitting to multiple zones
Mainline tubing (13mm)
Micro-tubing (4mm)
Drip emitters (adjust from 0.5-8 litres per hour)
DIY drip irrigation for 4 raised beds: £80 – £200 in materials.
Soaker Hose
A porous rubber hose that seeps water slowly along its entire length. Cheaper than drip systems and ideal for rows of vegetables or along a border. Less precise than individual drip emitters.
Cost: £10 – £30 per 15m length; £50 – £150 for a complete setup with timer.
Pop-Up Sprinklers (Lawn Irrigation)
Pop-up sprinkler heads are installed flush with the ground and rise when the system pressurises. They provide excellent coverage for lawns and require professional installation because of the need for underground piping.
Cost factors:
Number of sprinkler heads required
Size of lawn zones
Proximity of mains water supply
Need for a backflow prevention device (legally required by water companies)
A 100m2 lawn sprinkler system: £2,000 – £5,000 professionally installed.
Oscillating and Fixed Sprinklers on Timers
Hose-connected sprinklers with a tap timer are the simplest form of automated watering. Effective for lawns and large borders but not as water-efficient as drip systems.
Cost: £30 – £100 for timer and sprinkler head.
Controllers and Timers
An automatic controller is what makes irrigation genuinely useful — it waters on a schedule without you having to remember.
Smart controllers that adjust watering based on weather data and soil moisture sensors are worth the additional cost — they can reduce water use by 30-50% compared to fixed schedule systems.
Connecting to a Water Supply
Outdoor tap connection: The most common supply point. If you don’t have an outdoor tap, installation costs £150 – £350 by a plumber, including a backflow prevention device.
Water butt connection: Connecting irrigation to a water butt fed from a downpipe is an eco-friendly option. Gravity pressure is low a pump (£40 – £100) is needed for effective drip irrigation from a butt.
Water company requirements: UK water companies require a Type A air gap or double-check valve to prevent backflow from a garden irrigation system into the mains supply. This is a legal requirement under the Water Industry Act 1991.
Professional Installation
A professional irrigation designer and installer:
Surveys the garden and designs the zone layout
Calculates water flow requirements and pipe sizing
Installs underground mainlines and sprinkler heads or drip zones
Programs the controller
Commissions and tests the system
For a complex installation (lawn zones + border zones + raised beds, large garden): £3,000 – £8,000.
Water-Saving Features
Soil moisture sensors: Add £50 – £200 to a system. Override the scheduled watering when the soil is already wet. Can save 25-40% of water compared to fixed schedule.
Rain delay devices: Automatic tap timers with rain sensors that suspend watering during wet weather: £20 – £60 additional.
ROI: Is Garden Irrigation Worth It?
For avid kitchen gardeners, the reduction in crop losses during dry spells and the ability to take holidays without worrying about the garden make irrigation very worthwhile. For lawn owners who water regularly in summer, a sprinkler system can free up significant time. For anyone in a metered water supply area, the water savings from a drip system versus hand watering can contribute to the payback.
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