Before you begin
A few things to know.
Free tools for early design thinking. Please read the notice and accept the terms before you enter.
Tool-use notice
Useful starting points.
Always check the results.
These tools can contain errors, omissions and outdated information. Calculations, diagrams, dimensions and other results are indicative only. Buildner does not guarantee their accuracy, completeness or suitability for your project.
They are not professional architectural, engineering or legal advice. Do not rely on them for construction, safety, regulatory compliance, tender documents or contractual decisions. Independently verify every result and consult an appropriately qualified professional before using it in a project.
To the extent permitted by applicable law, the tools are provided “as is” and “as available”, without warranties. Buildner excludes liability for loss, damage or costs arising from their use or reliance on their results. Nothing in this notice excludes liability that cannot lawfully be excluded, or limits your mandatory statutory rights.
Your files. Your device.
Your project files
stay with you.
Buildner Tools does not upload or store the drawings, images or documents you open in its file-based tools. Those files are processed locally in your browser and stay on your device.
This applies to files opened in Buildner Tools. Acceptance records, error reports, online climate searches and calendar subscriptions involve other data, as explained below. Other Buildner websites have their own data practices.
What data is processed?
Files and calculations
Drawing overlay and Print-size check read your selected images on this device. The tools do not provide cloud storage or a backup of your project files. Most calculations run in your browser. Download anything you want to keep.
Online features
Climate card sends the search text or coordinates you choose to Open-Meteo, OpenStreetMap’s Nominatim and NASA POWER as needed. Those providers also receive connection information such as your IP address. Climate results may be cached in this browser tab.
If you subscribe to a Backwards planner calendar, its competition or deadline, start date and hours-per-week settings are sent to Buildner’s calendar endpoint and your chosen calendar provider. Buildner generates the feed without saving a project record. Request URLs can appear in hosting logs.
Reports you choose to send
If you send an error report, we save your optional note (up to 200 characters), the page address without query values or fragments, the date and time, your IP address, browser and screen details, and up to 40 recent technical errors from this page. Reports do not include your project files, form values or cookies. Reports are kept separately from acceptance records to investigate problems.
Your acceptance and technical records
We record the date and time, your IP address, browser information, the notice version and the three acknowledgements below to document your acceptance. We do not add your project files, calculator values or destination URL to that acceptance record.
An essential cookie remembers your acceptance on this browser for up to 12 months. Removing the cookie does not delete the separate acceptance record. Hosting providers may also keep access and security logs. This acknowledgement does not opt you into marketing or optional tracking.
Read the Privacy policy (opens in a new tab) and Cookie policy (opens in a new tab) for information about your rights, browser storage and how to contact Buildner.
Your acknowledgement
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Leave this siteBuildner Tools notice · Version 2026-09-17.5