How can I send a message or submit my proposal?
In this article, you will learn how to contact the general contractor as a subcontractor and how to officially submit your proposal step by step via 12Build.
What will you find in this article?
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Send a message: How to ask questions or share information with the General Contractor.
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Submitting a proposal: A step-by-step guide to submitting your price and documents.
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Communication management: Viewing sent and received messages.
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Attachments and templates: Handy features for quick processing.
Summary
You can send messages and submit proposals using the buttons in the Request for Proposal or directly from your project overview. Submitting a proposal involves a five-step process, during which you upload documents and fill in any budget lines.
Requirements and Target Audience
This article is intended for subcontractors who have been invited to a project. You need access to the 12Build environment to upload documents or fill in budget lines.
Send a message
There are several ways to send a message to the General contractor.
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Via email: In the received Request for Proposal, click on Respond / I have a question.
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Via the project overview: Click the Send Message button.
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In the message screen:
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Compose your text and, if necessary, use a template for common questions.
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Add attachments using the option at the bottom left of the screen.
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Via the Communication menu: Here you will find the entire history. Click “Reply” at the bottom of a message to respond.
Submit a proposal
Submitting your proposal is a structured process that ensures the general contractor receives all necessary information.
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Start: Click the green Submit Proposal button in the email or project overview.
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Step 1: Budget lines (optional): Enter the prices if the General contractor has provided budget lines. In the last column, indicate whether the line is included in your proposal.
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Step 2: Documents: Drag your bid documents into the area or use "Browse for file." Also select your general documents (such as terms and conditions).
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Step 3: Message: Write a cover message (using a template if desired).
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Step 4: Summary: Review all details. Use the Previous or Next buttons at the bottom left to make changes.
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Step 5: Send: Click Send to submit the proposal.

Frequently Asked Questions (FAQ)
Question: Why is Step 1 (budget rules) skipped for me? Answer: This step is optional. If the general contractor has not set up specific budget rules for the workpackage, the system automatically skips to the next step.
Question: Where can I find the confirmation of my sent message? Answer: All sent communications can be found in the 'Communication' menu under the 'Sent' heading.
Troubleshooting
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Symptom: I cannot upload files in step 2.
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Cause: The file may be too large or is currently being used by another program on your computer.
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Solution: Close the file on your computer and try dragging or uploading it again.
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Symptom: The 'Send' button is not clickable.
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Cause: Required fields are missing from previous steps, such as uploading a document.
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Solution: Review each step to ensure that all required information has been provided.
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