Roof & Bedroom Window Daylight Calculator

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This daylight calculator is intended as a general guidance tool to assist users in estimating recommended window glazing areas based on typical daylighting guidelines and best practices in residential design.

The results provided:

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• Are approximations only, based on user input and simplified assumptions.

• Do not constitute formal advice, certification, or regulatory compliance.

• Are not a substitute for full architectural, planning, or building warrant consultation.

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We make no claims that the results will meet all planning, building regulations, or daylighting standards (including BRE, Scottish Building Standards, or any other legal framework). Orientation, roof pitch, local context, and detailed technical factors can all impact actual requirements.

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Additionally:

• We do not refer to or endorse any specific brands or proprietary products, including any well-known roof window manufacturers.

• The tool is not affiliated with or approved by any third parties and is entirely neutral and independent.

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If you require verified calculations or design sign-off, please contact a qualified architectural professional or daylighting consultant.