Free Flat Roof Solar Designer Tool

Find your building, draw the roof and generate an indicative solar layout in minutes.

Find your commercial flat roof

Search for your building, click each roof corner (then the first again to finish), fine-tune the panel settings and generate your solar layout.

SATELLITE ROOF DESIGNERDrag to move · Hold arrows to pan · + / − to zoomPreparing your planner…

Preparing satellite map…

Once generated, click a panel to exclude it (translucent grey) and see the roof beneath. Click again to restore it.

Panel specification

Use the suggested dimensions or enter your own.

Width (m) Length (m) Power (W) Panel layout

Array alignment

Choose the direction and inclination of the panels.

Panels face towards

Rotation from longest roof edge 0°

Panel inclination (°)

Roof spacing assumptions

Roof edge setback—

Clear row spacing—

Fixed PV Plus layout settings. Actual spacing requires a project-specific survey and design.

This is an indicative 2D layout. Setbacks and row spacing use PV Plus's presets; they still require project-specific design.

Estimated solar performance

Indicative results only

ROOF AREA —

PANELS FITTED —

SYSTEM CAPACITY —

EXCLUDED PANELS —

ANNUAL GENERATION —

What this tool estimates: panel quantity, peak capacity and first-year annual generation using your supplied UK irradiation data and shade factor 1.00 (no shading). It cannot confirm: roof loading, shading, obstructions, fire access, electrical design, real mounting geometry or guaranteed energy yield. PV Plus must survey and design the installation.

Frequently Asked Questions

Is the solar design tool free to use?

Yes, our flat roof solar design tool is completely free to use. Simply find your commercial building using Google Maps, outline your roof and generate an estimated solar panel layout. No account or payment is required.

Is this tool for flat roofs only?

Yes, our solar design tool is specifically designed for commercial flat roofs. It allows you to explore different panel sizes, orientations and layouts, including south-facing and east-west systems. The tool is not currently suitable for pitched roofs.

Can i estimate the system size and number of panels?

Yes. Once you outline your roof and generate a layout, the tool estimates how many solar panels could fit, the total system capacity in kWp and the potential annual electricity generation in kWh. These calculations use your selected panel specifications and the tool’s preset spacing assumptions. All results are indicative and subject to a professional assessment.

Do i need a professional survey?

Yes. Although our free solar design tool provides an initial estimate, a professional roof survey is essential before installation. PV Plus will assess your roof’s structural capacity, condition, shading, obstructions, electrical requirements and suitable mounting systems to ensure the proposed solar installation is safe, practical and correctly designed.