Terms of use

Please read these before you use Treehouse Simulator or build anything from it.

Who we are

Treehouse Simulator (treehousesimulator.com) is a free tool for planning timber structures, made in the UK.

Using the app

The app is free to use for planning your own projects. By using it you agree to these terms.

It’s a planning aid, not professional advice

Designs, warnings, cut lists, shopping lists and plans are worked out from common rules of thumb, as a guide. They aren’t structural, architectural, legal or planning advice, and they aren’t checked against your site, timber, tree, ground or local rules.

Before building, you’re responsible for:

• checking the design suits your site and use, and having anything load-bearing checked by someone qualified;
• getting any planning permission, building regulations approval or other consent you need, including for protected trees;
• building safely, following the makers’ instructions for materials, fixings and bought parts;
• supervising children, and inspecting and maintaining what you build.

Please read Building safely.

Prices

Prices are typical UK prices including VAT, checked on the date shown in the app. They’re estimates for budgeting, not quotes: what you pay will differ.

Your designs

Your designs are yours. They’re kept in your browser (see Privacy); keeping copies safe is up to you, so save files of anything you want to keep. Anyone you give a share link to can see that design.

No guarantees

We work to keep Treehouse Simulator accurate and working, but it’s provided as it is: we can’t promise it’s free of mistakes or always available, and we may change or withdraw it.

Our liability

As far as the law allows, we aren’t liable for any loss, damage or injury arising from using the app, or from anything built from its designs or plans. Nothing in these terms limits or excludes any liability that can’t be limited or excluded by law, such as liability for death or personal injury caused by negligence.

Changes and law

We may update these terms; the version on this page applies. These terms are governed by the law of England and Wales, and its courts have jurisdiction.

Last updated 29 September 2026.