bldg

Terms of Use

Last updated: November 14, 2026.

These terms cover your use of usebldg.com: the website, the bldg editor at usebldg.com/editor/ and the files the site serves. By using the site you agree to them. If you do not agree, please do not use the site. Questions: hello@usebldg.com.

The service

• The editor is free to use, and you need no account for it. An account is free too; you need it only to keep your plans in the cloud or to connect an AI agent. You may use the editor for any lawful purpose, personal or commercial, including paid work for your clients.
• The editor runs in your browser. We may change, add or remove features, or stop offering the site, at any time.
• Some features may be offered for a fee in the future. We will say so clearly before anything costs money; nothing you use today will start charging you without your choice.

Your plans

• You own your plans. The plans you draw, trace or import, and the files you export, are yours. We do not claim any rights in them.
• Your plans stay with you. While you are signed in they are saved to your account, and an AI agent you connect can read and change them (see the Privacy Policy). Signed out, the editor keeps your work in your browser and on your computer when you save it.
• Share links carry the plan. Copy link puts the whole plan in the link. Anyone who has the link can open the plan, so share it only with people who may see it.
• Keep your own copies of work that matters (Save writes a .bldg.json file). Browser storage can be cleared by the browser, by you or by other software, and we cannot restore it.
• Only put into the editor material you have the right to use, such as plan images you made or may copy.

AI assistant

• The AI assistant uses an API key that you provide, with an AI provider that you choose. Your browser sends your requests directly to that provider. The provider's own terms and prices apply to that use, and the provider bills you, not us.
• AI output can be wrong. Review every change the assistant makes before you rely on it.
• An AI app you connect acts for you. bldg saves a version before each of its changes so you can undo it, but you are responsible for what you ask it to do.

Code checks and drawings are not professional advice

The code checks (IRC, IBC, ADA and others) are an aid, not an approval. They cover only part of each code, many results rest on assumptions, and local amendments are not modeled. A pass is not a permit or a certification. The drawings, areas and schedules are only as accurate as the plan. You are responsible for your designs: the building department and a licensed professional have the final say.

Our software

• The editor, the bldg engine, the website and their code are owned by us and protected by copyright. All rights reserved. These terms let you use them through the site; they do not give you a copy of the source code or any other right to it.
• You may not copy, modify, decompile, disassemble or reverse engineer the site's code or the engine, except where the law allows it despite this limit.
• The embeddable viewer (<bldg-viewer>, the npm package @usebldg/viewer) and the engine it loads come with their own licence, the bldg Viewer License, which lets you use and embed them on any website, commercial ones included.
• The bldg file format is documented in the open (Format, with its JSON Schemas): you may read and write .bldg.json files with any tool.
• bldg, the bldg name, wordmark and logo are our trademarks. These terms do not give you any right to use them, except to refer to bldg truthfully.

Acceptable use

Do not use the site to break the law or to infringe anyone's rights; do not try to disrupt, overload or gain unauthorized access to the site or its hosting; and do not use automated means to put a heavy load on it.

Other services

Some features use services run by others: the AI provider you choose, and OpenStreetMap's map tiles and place search for Pick on map. Those services have their own terms, and we are not responsible for them.

Feedback

If you send us feedback or ideas, we may use them to improve bldg without any obligation to you.

No warranty

The site, the editor and everything they produce are provided "as is" and "as available", without warranties of any kind, express or implied, including warranties of merchantability, fitness for a particular purpose, accuracy and non-infringement, to the fullest extent the law allows.

Limitation of liability

To the fullest extent the law allows, we are not liable for any indirect, incidental, special, consequential or punitive damages, or for any loss of data, profits or business, arising from your use of the site, even if we were told they might happen. Our total liability for any claim about the site is limited to US$100. Some places do not allow these limits, so they may not all apply to you.

Changes to these terms

We may update these terms. The date at the top says when they last changed; using the site after a change means you accept the new terms.

bldg · Editor · Editor guide · Viewer · Format · Benchmarks · Limitations · Terms · Privacy · hello@usebldg.com