One original price still lists panels that overlap a vent on the measured roof.
THE DERBY FIELD GUIDE / SOLAR PANELS
Solar panel installers in Derby
One vent can remove a row of panels from a desktop sketch. Demand a measured Derby roof plan and an output forecast for that final layout.
START WITH THE PROPERTY
Mark obstructions before counting panels
For a Derby roof, photograph chimneys, vents, roof lights and any shaded corners. Ask for a measured layout with the actual panel dimensions instead of a rectangle filled to its edges.
BEFORE YOU ACCEPT A QUOTE
Check both fit and forecast
A surveyed plan should explain safe spacing, inverter arrangement and access. If even one row disappears after inspection, the annual output and financial illustration need to be revised.
ILLUSTRATIVE QUOTE COMPARISON
Did the roof survey shrink the array?
Another removes that row and updates the forecast.
THE DECISION
Reject the stale layout as a comparison point. Ask for actual panel positions, generation and price after the same physical constraints are applied.
ANOTHER PROJECT AT THE SAME ADDRESS?
Explore the other options in Derby.
NEXT STEP IN DERBY
Check the roof beneath the layout.
Ask whether coverings or fixings need attention before panels go on. A perfect array drawing is of little use if roof repair soon requires removal.