Subcontractor Portal
Give Your Subcontractors the Visibility They Need
Your subcontractors are not mind readers. They cannot see your schedule, they do not know when predecessor trades will finish, and they cannot access your project documents. Home Build Flow gives every subcontractor their own portal — a free, simple login where they can see their tasks, check the schedule, download drawings, and update their progress. No phone calls needed.
The Problem
Why Subcontractors Arrive at the Wrong Time
When subcontractors have no access to the current schedule, miscommunication is inevitable. These three patterns cost builders thousands of pounds on every project.
Subcontractors Never Know When They Are Needed
Your electrician was told verbally three weeks ago that first fix electrical would start on the 12th. The schedule changed last Tuesday because the breather membrane was delayed, pushing first fix back by a week. But nobody called the electrician. They arrive on site on the 12th, ready to work, and discover the internal lining is not complete. They pack up, drive to another job, and now you have to negotiate a new start date around their other commitments. This costs you at least a week — and it happens because your subcontractors have no way to see the current schedule.
No Shared Schedule Between Builder and Subcontractor
The schedule lives in your head, your site manager's notebook, or a spreadsheet on a laptop in the site cabin. Subcontractors get their dates through phone calls and text messages. There is no single source of truth that both parties can reference. When the plasterer asks, 'When do you need me?', the answer depends on which version of the schedule your site manager has in front of them — and whether they remembered to update it after yesterday's delay to the tacking.
Constant Phone Calls for Basic Information
Your phone rings twelve times a day with subcontractors asking the same questions: 'Is the site ready for me?', 'Where are the latest drawings?', 'Has the previous trade finished?', 'When is my next task?' Each call takes five to ten minutes and interrupts whatever you were doing. Over a twenty-week build, that adds up to hundreds of hours spent relaying information that should be self-service.
The Solution
A Portal Built for Tradespeople, Not Office Workers
The subcontractor portal is designed for speed and simplicity. Check tasks in thirty seconds, update status in two taps, and access documents without digging through email.
Dedicated Subcontractor Login
Each subcontractor receives their own login credentials to access a portal scoped to their specific tasks and schedule. They see only what is relevant to them — their assigned tasks, the schedule windows they need to hit, relevant project documents, and communication from your team. They cannot access financial information, other subcontractor details, or internal team communications.
Task Visibility and Status Updates
Subcontractors can see all tasks assigned to them across your projects, with clear status indicators: upcoming, ready to start, in progress, and complete. They can update task status from their end — marking work as started and completed — which feeds directly into your project dashboard. When the roofer marks the ridge tiles as complete, your milestone tracking and schedule automatically update.
Live Schedule Access
Subcontractors see a filtered view of the construction schedule showing their tasks and the tasks that directly precede theirs. The MVHR installer can see that the internal lining is scheduled to complete on the 15th, meaning they are needed from the 16th. When the schedule changes, their view updates automatically — no phone call required.
Document Access and Uploads
Share drawings, specifications, method statements, and site plans with subcontractors through the portal. They can also upload documents back to you — completion certificates, test results, commissioning reports, and progress photos. All documents are version-controlled and timestamped, creating a clear record of what was shared and when.
Automated Notifications
When a task is approaching its start date, the assigned subcontractor receives an automated notification. When a predecessor task completes — meaning the site is now ready for the next trade — the upcoming subcontractor is notified to mobilise. When the schedule changes, affected subcontractors receive updated dates. All of this happens without your team picking up the phone.
Scoped Permissions and Privacy
Each subcontractor sees only their own scope, schedule, and documents. The plumber cannot see what the electrician is earning or what tasks the plasterer is assigned. Financial details, margin calculations, and internal team discussions are invisible to subcontractor portal users. This maintains appropriate information boundaries while still providing the visibility that subcontractors need.
Benefits
What Changes When Subcontractors Can See the Schedule
Subcontractors Arrive Prepared and On Time
When the plasterer can see that tacking is complete and their task window opens on Monday, they plan their week accordingly. No wasted journeys. No arriving to find the site is not ready. The portal turns schedule visibility from a privilege into a standard.
Reduce Phone Calls by Up to 80 Percent
Most subcontractor phone calls are about basic scheduling information: when am I needed, is the site ready, where are the drawings. The portal makes all of this self-service. Your team's phone stops ringing for routine enquiries, freeing them to manage the build instead of relaying information.
Mutual Accountability on Every Task
When a subcontractor has portal access with their tasks, schedule, and documents clearly visible, there is no room for 'I didn't know' or 'Nobody told me.' The portal creates a shared understanding of expectations that benefits both the builder and the subcontractor.
Better Subcontractor Relationships
Subcontractors appreciate builders who respect their time. Providing a portal that gives them clear, current information — rather than expecting them to work from verbal updates and guesswork — signals professionalism. Better information leads to better relationships, which leads to better availability when you need them.
How It Works
Set Up the Subcontractor Portal in Four Steps
Invite Your Subcontractors
Send a portal invitation to each subcontractor from their profile in the platform. They receive an email with a link to create their free account. The sign-up process takes less than two minutes and requires no training — the portal is designed for tradespeople who are not necessarily tech-savvy.
Assign Tasks and Share Documents
When you assign tasks to a subcontractor in your schedule, those tasks automatically appear in their portal. Share relevant drawings, specifications, and site access information through the document sharing feature. The subcontractor's portal becomes their single reference point for everything they need to know about your project.
Let the System Handle Communication
Automated notifications keep subcontractors informed about schedule changes, approaching start dates, and predecessor task completions. Your team no longer needs to make individual phone calls for routine schedule communication. Reserve direct communication for complex situations that require discussion.
Track Activity and Build Accountability
Monitor which subcontractors have logged into the portal, acknowledged schedule changes, and updated task status. If the ASHP installer has not logged in and their task starts in three days, your system flags it for follow-up. The portal creates mutual accountability — subcontractors cannot claim ignorance when the information is in their portal.
Related Features
The Portal Is Part of a Complete Subcontractor System
The subcontractor portal works alongside the full Home Build Flow platform to manage every aspect of your external team.
Subcontractor Management
The complete management system for scheduling, documents, performance tracking, and communication with all your subs.
Learn moreConstruction Scheduling
The schedule that powers the portal — when you update it, subcontractor views update automatically.
Learn moreSubcontractor Solutions
How Home Build Flow improves the experience for both builders and subcontractors on every project.
Learn moreIndustry Context
Why Subcontractor Visibility Is a Competitive Advantage
The Chartered Institute of Building (CIOB) has consistently advocated for improved information sharing between main contractors and subcontractors as a key driver of construction efficiency. In residential construction, where subcontractors represent the majority of the labour force on any project, giving them access to current, accurate schedule information is not a luxury — it is a prerequisite for on-time delivery.
While enterprise platforms like Buildertrend offer subcontractor portals for production home builders, the custom residential sector has lacked a purpose-built solution. Home Build Flow addresses this gap with a portal designed specifically for the trade coordination challenges of bespoke home construction — where dependencies are complex, schedules shift frequently, and every subcontractor's timing affects every other.
Subcontractor Portal FAQ
Give Your Subs the Visibility They Deserve
Set up the subcontractor portal and reduce scheduling miscommunication on your next build. Free for all your subcontractors.