A typical contractor's employees use many applications: Microsoft 365, a project management platform, a document or BIM tool, accounting and payroll software, timekeeping, and more. Each has its own login, and people deal with that by reusing passwords or keeping them in a notebook. Single sign-on, often shortened to SSO, lets users sign in once through a central identity, usually Microsoft Entra ID for companies already on Microsoft 365, and reach connected applications without separate passwords.
SSO is not a cure-all, but for many contractors it is one of the most effective improvements available. Here is what to know.
What SSO does well
- Fewer passwords. Users remember one strong credential protected by MFA instead of many weak ones.
- Central control. When someone leaves, disabling one account removes access to every connected app.
- Consistent MFA. You enforce one set of authentication rules across applications.
- Better visibility. Sign-in logs are in one place, making unusual activity easier to spot.
- Faster onboarding. New hires get access to the right apps by group membership.
Where SSO falls short
Understand the limits before you rely on it.
- Not every application supports SSO, and some vendors reserve it for higher-priced plans.
- Apps that remain outside SSO still need their own protection.
- A compromised central account now opens many doors, so that account needs strong protection.
- External users such as subcontractors may not be part of your identity system.
- Older desktop accounting software may not integrate at all.
Ask each vendor whether SSO is included, what it costs, and which protocol it uses.
Planning the rollout
Step 1: Inventory your applications
List every application that holds company data, including who uses it and how users sign in. Mark each one as supports SSO, supports SSO at an added cost, or does not support it. Include applications that individual teams signed up for themselves.
Step 2: Prioritize
Start with the applications that matter most and are easiest to connect, typically Microsoft 365 services and major project platforms. Save the awkward ones for later.
Step 3: Strengthen the central identity first
Before connecting anything, make sure the central accounts are well protected.
- Require MFA for every user, with phishing-resistant options for administrators.
- Protect administrator accounts with separate, dedicated logins.
- Set conditional access rules, such as blocking sign-ins from countries where you do not operate.
- Review sign-in alerts and make sure someone looks at them.
Step 4: Pilot with a small group
Pick a project team or office group, connect one application, and gather feedback. Watch for issues such as users with different email addresses in the application than in your directory, which can create duplicate accounts.
Step 5: Communicate with field staff
Field workers often use phones and shared tablets, and SSO changes their login experience. Explain the change in plain language, show them what the new prompt looks like, and provide a quick-reference card. Make sure there is a support number for the first week.
Step 6: Retire the old logins
Once SSO works for an application, disable the separate password logins where the vendor allows, so that people cannot bypass the new protection. Keep one tightly controlled emergency administrator account in case the identity service is unavailable, and store its credentials securely.
Handling outside users
Subcontractors and consultants usually need to be handled separately. Some platforms let you invite external users with their own credentials, while others support federation with their identity systems. Whichever you choose, require MFA for external accounts and attach end dates to them.
Consider a hypothetical rollout
A hypothetical 150-person contractor might begin with Microsoft 365 and its project management platform. After the pilot, it connects the timekeeping app and the document control tool. Accounting software that does not support SSO stays outside, but the company protects it with a separate access review and restricted network access. In six months, most daily logins are covered, and offboarding becomes a single action for most systems.
Keep it maintained
SSO needs ongoing care. Review application assignments quarterly, remove unused apps, check certificate expiration dates for connections that use them, and confirm that group-based access still matches current roles.
Where Ironfield Cyber helps
Ironfield Cyber helps contractors plan and deploy single sign-on and MFA across construction software, including field-friendly rollouts that do not slow the crews. If you want a clear picture of which of your applications can be connected and in what order, we can build that plan with you.