Terms of Service

Version 2026-11-02. These terms are an agreement between you and Plumbline Studios ("we", "us", "our"), trading as Plumbline Studio. Please read them carefully: they limit our liability and they put responsibility for checking and using the output on you.

1. The service and these terms

Plumbline Studio turns a written brief or your uploaded drawings into AI-assisted architectural and structural drawing sets, reports and files (PDF, DXF, SVG, 3D and BIM models, calculation and quantity reports, and related tools) ("the Service"). Everything the Service produces for you is "Output". Your briefs, uploaded files, comments and other material are "Your Content". By creating an account, clicking to accept, or using the Service you agree to these terms, our Privacy Policy and the Acceptable Use & Professional Disclaimer. If you use the Service for an organisation, you confirm you have authority to bind it, and "you" includes it. If you do not agree, do not use the Service.

2. Eligibility and accounts

You must be at least 18 and able to form a binding contract. You must give accurate details and keep them current. Keep your password and any two-factor device secret. You are responsible for all activity under your account and must tell us at once at [email protected] if you suspect unauthorised use. One account is for one person. We may require approval of new accounts, refuse or suspend any account, and limit or change what an account can do.

3. Free trial, plans, billing and taxes

New accounts get a free trial of 3 complete drawings, subject to usage limits we set. Trial downloads are watermarked and some features are for paid plans only. Paid plans are billed in advance, monthly or yearly, through our payment processor (Stripe) and renew automatically until you cancel. One-off payments (for example PayNow) buy a fixed period and do not renew. Prices, fair-use limits and included features are shown at checkout and on the pricing page. We may change them for future billing periods with at least 30 days' notice. Prices exclude taxes unless stated; you are responsible for taxes that apply to you. You can cancel at any time in Account > Manage billing; access continues until the end of the period you have paid for. If a payment fails we may suspend paid features until it is settled. Reversing a payment or filing a chargeback without first contacting us to resolve the issue may lead to suspension and recovery of our costs.

4. Refunds

Each drawing uses paid computing resources, so fees are non-refundable except where the law requires, or where the Service was materially unavailable or unusable for you. Contact [email protected] within 14 days of a charge and we will review it in good faith. Refunds are at our discretion in all other cases.

5. AI output can be wrong: you must check it

The Service uses artificial intelligence and automated calculation. AI can make mistakes. Output may be inaccurate, incomplete, internally inconsistent, out of date, or unsuitable for your site, your building type, your climate, your soil or your jurisdiction. Running the same brief twice may give different results. Checks, warnings and "pass" results shown by the Service are aids and do not guarantee that a drawing, calculation, quantity or report is correct or complete. Reading an uploaded drawing involves interpretation and can misread dimensions, scale, stairs, openings, levels and notes.

It is your responsibility to check all Output before you rely on it. You agree to review every drawing, calculation, quantity, cost figure, model and report; to compare uploaded-drawing results with your originals; and to have a suitably qualified and licensed professional review, adopt and take responsibility for any design before it is used for design development, procurement, tender, permit or approval submission, construction, or any safety-related purpose. Output is marked "for review - not for construction" and you must not remove or obscure that marking when sharing it.

6. No professional advice or relationship

We are a software service. We are not architects, engineers, quantity surveyors, planners or legal advisers, and we do not provide professional services. Nothing in the Service or the Output is professional advice, a certification, an approval, a stamp, a permit or a statement that anything complies with any law, code, standard or regulation. Compliance reports, submission checklists, quantities, cost estimates, calculation packages and exported model files (including IFC and STAAD files) are starting points; rules, values and rates in them may be incomplete, simplified, illustrative or out of date, and you must verify them against current legislation and your own data. Exported files may not open or behave correctly in third-party software, and you must check them before using them there.

If you request an engineer review, the reviewing engineer acts in their own professional capacity and is responsible for their own review, advice, signature and stamp. We only connect the request and record the outcome. A review covers only the exact version reviewed and only the scope the engineer records.

7. Your content and your Output

You keep ownership of Your Content. Subject to these terms and to third-party rights in material you upload, you own the Output generated for you, and you may use it for your own lawful purposes. You give us a worldwide, non-exclusive licence to host, copy, process, transmit and display Your Content and Output only as needed to run, secure, support and improve the Service for you, and to comply with law, including sending it to the third-party providers described in the Privacy Policy. You promise that you have all rights and permissions needed to upload and use Your Content (including third-party drawings, client information and personal data in it) and that it does not infringe anyone's rights or break the law. We may remove or disable content that we reasonably believe breaks these terms or the law.

8. Data we collect and how we use it

To provide the Service we collect and process: your account details (name, company, email, hashed password, security settings); Your Content (briefs, uploaded drawings, comments, project data and the Output); usage and technical data (runs, usage measures, features used, IP address, browser and device details, sign-in times, error and security logs); billing data (invoices, subscription status; card details are handled by Stripe and not stored by us); and messages you send us. We use this data to run and secure the Service, apply limits, bill you, provide support, prevent abuse and fraud, comply with law, and (in aggregated or de-identified form) understand and improve the Service. We do not sell your personal data and we do not use Your Content for advertising. We do not ourselves use Your Content to train AI models. Third-party providers (such as the AI provider, payment, email and hosting providers) process data under their own terms and our instructions; they are described in the Privacy Policy. By using the Service you consent to this collection, use and disclosure. Content you upload may include personal data of other people (for example site owners or clients): you must have the right to share it with us.

9. Our intellectual property

We and our licensors own the Service, including the software, design, rules packs, templates, layouts, reports, drafting standards and documentation, and all related intellectual property. We give you a limited, personal, non-exclusive, non-transferable, revocable right to use the Service under these terms. You may not copy, scrape, reverse-engineer, decompile or extract the source, rules, models or prompts of the Service, build a competing product from it, or benchmark it for a competitor. If you give us feedback or suggestions we may use them freely without obligation to you.

10. Acceptable use

You agree not to: use the Service unlawfully; present Output as professionally certified, stamped or approved when it is not; submit Output to an authority or use it to build without independent professional review; upload malware or material you have no right to use; probe, overload, bypass limits of or attempt to access other users' data or the Service's systems; share an account or credentials; resell, sub-license or provide bulk or automated access without our written agreement; use the Service to develop weapons or for any activity where an error could foreseeably cause serious harm without professional safeguards; or use the Service in breach of sanctions or export laws. See also the Acceptable Use & Professional Disclaimer.

11. Sharing, comments and collaboration

Share links give anyone who has the link the ability to view the shared sheets and, if you allow it, to comment, until the link expires or you withdraw it. You are responsible for who you send a link to and for what you share. Comments and names typed by people who open your link are provided by them; we do not verify them. If you request an engineer review, you authorise the reviewing engineer and our administrators to open that drawing for the review.

12. Third-party services

The Service relies on third parties (for example AI, payment, email, hosting and network providers) and may link to third-party sites. We are not responsible for them, for their availability or for their handling of data under their own terms. If a third-party service changes or fails, the Service may change or be interrupted.

13. Availability, changes, beta features and your own copies

We work to keep the Service available but do not promise uninterrupted or error-free operation. We may change, add, limit or retire features, plans and limits at any time. Some features may be labelled beta or starter and are provided with even fewer assurances. Keep your own copies of anything important. Download your Output and your data regularly; we do not promise to keep it indefinitely and we are not liable for loss of data.

14. Disclaimer of warranties

The Service and all Output are provided "as is" and "as available". To the fullest extent the law allows, we disclaim all warranties, express or implied, including merchantability, fitness for a particular purpose, accuracy, completeness, non-infringement, compliance with any code, law or standard, and any warranty that the Service or Output will be correct, safe, error-free, uninterrupted or suitable for construction.

15. Limitation of liability

To the fullest extent the law allows: (a) we are not liable for any indirect, incidental, special, consequential or punitive loss, or for loss of profit, revenue, business, contracts, goodwill, data or opportunity; (b) we are not liable for any loss, damage, injury, delay, cost, claim, penalty or rejection arising from your or anyone else's reliance on, use of, or failure to check the Output, including design errors, structural failure, construction defects, cost overruns, non-compliance, permit refusals or third-party claims; (c) our total liability for all claims arising out of or relating to the Service or these terms is limited to the fees you paid us in the 12 months before the event giving rise to the claim, or S$100 if you paid nothing; and (d) these limits apply whatever the legal theory, including negligence, and even if we were told the loss was possible. Nothing in these terms excludes or limits liability that cannot be excluded or limited by law, such as liability for fraud or, where the law does not allow it to be excluded, for death or personal injury caused by negligence. Some jurisdictions do not allow certain limits; in that case ours apply to the extent permitted.

16. Indemnity

You agree to defend, indemnify and hold harmless us, our owners, officers, contractors and suppliers from claims, losses, liabilities, damages, penalties and costs (including reasonable legal fees) arising from: your use of the Service or Output; Your Content; your breach of these terms or the law; any design, construction, submission, procurement or other decision made using Output; or any claim by someone you share Output or links with.

17. Your legal and regulatory duties

You are responsible for obtaining all permits and approvals, for engaging appropriately licensed professionals where the law requires, for complying with building, planning, fire, safety, accessibility, environmental and other laws that apply to your project, and for the accuracy of the plot, site, load and use information you give. We have no control over, and give no assurance about, how any authority or professional will treat Output.

18. Suspension and termination

You may close your account at any time in Account. We may suspend or terminate your access at any time, with or without notice, if you breach these terms, if payment fails, if required by law, or if we reasonably believe your use puts the Service, other users or us at risk. On closure your personal details are removed from our systems promptly and your projects are held for up to 30 days and then deleted, subject to legal retention and routine backups. Fees already paid are not refunded except as these terms say. Sections that by nature should survive (including 5 to 9, 14 to 16, 19 and 20) survive termination.

19. Changes to these terms

We may update these terms. If a change is material we will tell you by email or in the Service. Continuing to use the Service after the change takes effect means you accept it. If you do not accept, stop using the Service and close your account.

20. General and governing law

These terms, with the Privacy Policy and the Acceptable Use & Professional Disclaimer, are the whole agreement between you and us about the Service. If a part is unenforceable the rest still applies. Our failure to enforce a right is not a waiver. You may not assign these terms without our consent; we may assign them to a successor. We are not liable for delay or failure caused by events beyond our reasonable control. Notices to you may be sent to your account email. These terms are governed by Singapore, and its courts have exclusive jurisdiction over disputes, unless the law gives you a different right. Please contact us first at [email protected] so we can try to resolve any issue informally.

21. Contact

Plumbline Studios. Email [email protected].