Legal
Terms and Conditions
These terms explain how to use Extension Cost Calculator UK and how to interpret the estimates and guide content on this site.
Using the site
Extension Cost Calculator UK provides early-stage budgeting tools and homeowner guidance for extension projects. The information is designed to help you understand likely cost ranges before speaking with builders, designers, or other professionals.
By using the calculator, guides, forms, or any other part of this site, you agree to use the information as general guidance only. If you do not agree with these terms, please do not use the site.
Calculator estimates
Calculator results are indicative estimates based on modelled UK cost ranges and the inputs you provide. They are not fixed quotes, offers, guarantees, or professional assessments of your property.
Actual project costs can vary because of design complexity, structural requirements, site access, planning constraints, specification level, local labour rates, and contractor availability.
Professional advice
You should always confirm project costs, permissions, structural requirements, party wall matters, and building regulations with qualified professionals before committing to work.
Nothing on this site replaces architectural, structural, planning, legal, financial, or contractor advice.
Limitation of liability
To the fullest extent permitted by applicable law, Extension Cost Calculator UK accepts no liability for any loss or damage — direct, indirect, or consequential — arising from reliance on the calculator outputs, guide content, or any other information on this site.
We do not accept liability for decisions made about construction projects, planning applications, financial commitments, or contractor appointments based on information from this site.
Content and changes
We aim to keep content practical and useful, but construction costs and planning fees can change. We may update, remove, or amend calculator logic, guide content, and page information at any time without notice.
You may link to this site, but you may not copy, reproduce, or republish substantial parts of the content without our written permission.
Privacy
Use of this site is also governed by our Privacy Policy, which explains how we handle any personal information submitted through the contact form.
Governing law
These terms are governed by the laws of England and Wales. Any disputes arising from use of this site will be subject to the exclusive jurisdiction of the courts of England and Wales.