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New build
Step 1 of 8
Size
Roof dimensions
Use width × length (we'll multiply), or jump straight to total m². Estimate accuracy is plus/minus 5–10% — the site survey confirms the exact figure.
Or enter total:m²
Add a wing, an outhouse or a garage separately if it differs in size, pitch or substructure — it prices more accurately than averaging it into one rectangle. Colour and solar apply to the whole roof.