A ground stand is a good UK place for an outdoor unit when walls are weak or noisy, as long as the base stays level, water can drain, and the unit is out of the mower's path and out of flood water. Loose slabs on gravel settle. The coil then twists, the fan howls, and a strimmer throws stones into the fins. Use a purpose-made stand or a slab on a compacted base, keep the manufacturer's clearances, and leave a way for an engineer to remove the front panel.
A pad that stays level after the first winter
Gravel alone is not a foundation. A stand with feet on a concrete pad, or a manufacturer-style ground frame on a compacted and edged base, stays true. Four decorative slabs dropped on loose stones will rock after the first winter. An outdoor unit that is out of level stresses pipe connections and gets noisier. Compact the base. Do not rely on loose gravel. Keep the unit level for the life of the install. Leave service clearance in front of the panel. Follow the airflow gaps on the datasheet.
Anti-vibration feet still belong under the chassis so the stand does not drum into a patio. They do not replace a solid base. Insulate the pipe run from the stand to the wall and protect it from strimmers. The indoor drain is a separate pipe. Both should be on the quote, along with the electrical isolation within reach of the engineer. F-gas checks and coil cleaning need that same gap in year five.
Flood hollows, strimmers and the neighbour's chair
The low corner of a garden, the foot of a downpipe and the hollow by a soakaway are where condensers drown. Water around the electrics and the coil base corrodes the unit and trips it. Raise the stand above the level water actually reaches, and do not block the path of surface water so it ponds somewhere new. In heating mode the outdoor unit sheds water. Give that water somewhere to go that is not into the electrics or across a path that will ice over. A gravel bed can drain well when it is detailed, and it can also hide a flooded tray you will not see until the unit fails.
A coil is a stone magnet. Set the stand beyond the mower's swing and away from where a strimmer flicks gravel. A simple guard that does not choke airflow saves fins. Leaves from a nearby hedge block the intake every autumn, so leave a side you can clear without moving the whole unit. Do not plant shrubs against the discharge. The clearances are for performance and for service, not only for the day of installation. A ground stand in an open garden can be quieter for you and louder for the neighbour whose seating is a metre away. In England, check Planning Portal conditions for boundaries and noise before you pour a pad on the line.
Frequently asked questions
Can I put the outdoor unit straight on the gravel?
No. Use a proper stand or slab on a compacted base so the unit stays level and the coil stays out of the stones.
Will gravel stop flooding problems?
Gravel can drain a pad that is detailed properly. It will not save a unit sat in a hollow that floods. Raise the stand above known water levels.
How do I stop the lawnmower wrecking the coil?
Place the unit outside the mowing line and away from strimmer gravel, and keep a guard that does not block airflow. Leave room to clean leaves off the coil.
Do anti-vibration feet replace a compacted base?
No. They stop the stand drumming into a patio. They do not replace a solid, compacted base that keeps the unit level.
Where should heating-mode water from the outdoor unit go?
Give it a path that is not into the electrics or across a path that will ice over. A gravel bed can hide a flooded tray, so the outlet has to be one you can see.
Can the pad sit on the boundary?
Check first. In England, Planning Portal conditions cover boundaries and noise. A ground stand can be quieter for you and louder for a neighbour sitting a metre away.
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How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.