Terms and Conditions

Use of the site

Extension Cost Calculator provides estimated costs for UK home improvement projects for general information and early planning only. You may use the site to explore possible budgets for extensions, loft conversions, basement work and related projects.

Nothing on this site is professional advice. The content and calculator results should not be treated as architectural, structural, legal, planning, financial or building advice. Before making decisions or starting work, you should speak to suitable qualified professionals.

Accuracy of estimates

Calculator estimates are based on typical UK project data, user inputs and assumptions built into the calculator. They are intended to give a useful guide, not a fixed price or guaranteed result.

Actual costs can vary significantly depending on location, site conditions, access, design complexity, specification, materials, contractor pricing, professional fees, planning requirements and building regulations requirements. You should obtain detailed quotes and professional guidance before committing to any project or budget.

Intellectual property

The content, calculator logic, design, layout and other materials on this site belong to Extension Cost Calculator unless stated otherwise. You may view and use the site for personal, non-commercial planning purposes.

You must not copy, reproduce, republish, redistribute or commercially exploit the site’s content or calculator logic without permission.

External links

The site may include links to third-party websites or resources. These links are provided for convenience and further reading only. We are not responsible for the content, accuracy, availability or privacy practices of third-party websites.

Limitation of liability

The site is provided on an “as is” basis. While we aim to keep the information useful and up to date, we do not guarantee that the site, content or calculator results will always be complete, accurate, current or available.

To the fullest extent permitted by law, Extension Cost Calculator is not liable for loss, damage, cost or inconvenience arising from decisions made in reliance on calculator estimates or site content. Nothing in these terms excludes liability that cannot legally be excluded.

Governing law

These terms are governed by the laws of England and Wales. If a dispute arises in connection with use of the site, it will be handled under the applicable courts and legal procedures of England and Wales.