How many solar panels fit on a warehouse roof?
A modern UK warehouse fits roughly 100 kWp — around 200 solar panels at 500 W each — per 1,000 m² (10,760 sq ft) of usable south-facing metal roof. A 40,000 sq ft distribution shed typically fits a 300 kWp array (~600 panels); a 150,000 sq ft big-box DC fits about 1.1 MWp (~2,200 panels) after allowing for walkways, rooflights and setbacks.
Last updated 26 July 2026.
Key facts at a glance
| 10,000 sq ft warehouse | ~75 kWp (150 panels) |
|---|---|
| 20,000 sq ft warehouse | ~150 kWp (300 panels) |
| 40,000 sq ft warehouse | ~300 kWp (600 panels) |
| 80,000 sq ft warehouse | ~600 kWp (1,200 panels) |
| 150,000 sq ft warehouse | ~1.1 MWp (2,200 panels) |
| 300,000 sq ft warehouse | ~2.2 MWp (4,400 panels) |
| Panel area | ~2.6 m² per panel including access |
What limits the count
Rooflight zones, HVAC plant, walkways and edge/ridge setbacks typically remove 15–25% of the roof plane. Orientation matters — east-west arrays fit more panels but at ~10% lower per-panel yield. Older metal roofs with fragile fixings can constrain layout further.
Structural check comes first
A modern clamp-fixed rooftop array adds 15–20 kg/m² of dead load. Post-2000 UK sheds almost always accept this; pre-1990 fibre-cement or lightweight portal frames may need reinforcement or ballast reduction. A structural survey is standard.
Related reading
FAQ
How many solar panels fit on 40,000 sq ft of roof?
About 600 panels (300 kWp), generating around 285,000 kWh/year in the UK.
How many panels for a 1 MWp warehouse system?
Roughly 2,000 panels at 500 W each, or 1,820 panels at 550 W. Requires about 10,000 m² of usable roof.
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