Calendar Access for External Contractors: Your Real Options Compared

The Problem: You Schedule Around People Who Do Not Work for You

Say you run an agency that hands overflow work to freelance designers. Or a renovation firm coordinating electricians who run their own companies. You plan around these people constantly, but they sit outside your Google Workspace or Microsoft 365 organisation, so none of the calendar visibility you take for granted with colleagues applies to them.

What follows is usually a chain of back-and-forth emails: "Are you free Thursday afternoon?" and a day of waiting. There are five realistic ways to solve this. They are not interchangeable, and some are genuinely fine in the right situation. Here is each one, what it gets you, and where it breaks.

Option 1: Native Sharing in Google Calendar or Outlook

Google and Outlook both let one person share their calendar with another. Inside a single organisation this is the obvious answer: free/busy visibility across the domain is usually on by default, permissions are managed centrally, and nobody needs another tool. If you and the contractor are in the same Workspace or Microsoft 365 tenant, use this and stop reading.

Across organisations it gets awkward fast:

• The contractor has to share outward. You cannot pull their calendar; they must go into their settings and grant you access, and their admin may have external sharing locked down entirely.
• It over-shares by default, indefinitely. A typical share exposes either full event details or their entire free/busy picture, around the clock, until they remember to revoke it. Most contractors do not want one client seeing their weekends or another client's bookings.
• Revoking is buried. The sharing controls sit several menus deep, and neither side is notified when access is revoked or permissions change. Shares tend to outlive the working relationship.
• The share itself has no booking layer. You can see they are free at 2pm, but you still negotiate the time by email and create the event by hand. Native booking pages (Google appointment schedules, Microsoft Bookings) publish your availability; they cannot book against an external contractor's calendar.

Option 2: Add Them as a Guest to Everything

The zero-setup approach: invite the contractor to each event that concerns them, or forward invites along. It works for the events you create. The problem is everything else. You get no view of their other commitments, so you are still guessing at availability before every invite. And it fails quietly: forgotten invites, forwarded events that drift when the original moves, a calendar whose accuracy depends on you never slipping. This is a way to notify someone of meetings, not a way to see when they can meet.

Option 3: A Shared Team Calendar Everyone Writes Into

Create one shared calendar and ask every contractor to copy their busy blocks into it. On paper you get a single availability board. In practice it is double data entry, and double entry always drifts. The contractor's real calendar updates itself (other clients send invites, the dentist reschedules); the shared one only updates when they retype the change. Within weeks you have a calendar that looks authoritative and is quietly stale, which is worse than nothing, because you will book against it.

Option 4: Buy Them a Seat in Your Scheduling Tool

Most team scheduling tools will bring an external person into your account if you pay for a seat and they sign up. This does solve visibility. It costs on both sides: a per-seat fee that often exceeds what a light-touch contractor justifies, and adoption friction on theirs (create an account, connect a calendar, learn a tool they never asked for). For a contractor embedded with you four days a week, a seat can be the right call. For the electrician you book five times a year, asking them to adopt your software is where the plan dies.

Option 5: An Invite-Link Connection (the CalendarSync Model)

CalendarSync approaches this from the opposite direction: instead of the contractor joining your tool, they connect their existing calendar to your account through a one-time invite link, with no account created on their side at all.

You send an invite from your account (one person per invite; the link works once and expires in seven days). The contractor opens it, chooses what you can see, clicks Connect Google or Connect Outlook, and signs in on Google's or Microsoft's own page. The whole thing takes about a minute, and no password ever touches your side.

The defaults are deliberately conservative:

• Busy-only by default. You see busy and free blocks, never event titles, unless they actively choose to share full details.
• Revocable by either side. They get a private manage link by email and can change visibility or disconnect at any time, without asking you first. You are notified by email if they do, and you can remove the connection from your side too.
• One-way privacy. Their busy times flow to you. They see nothing of your calendar, and contractors cannot see each other.

Once connected, their availability feeds your scheduling. You can create a person-scoped booking link ("Book Sam") that only offers times Sam is actually free and hand it straight to clients; a booking for Sam never blocks anyone else. Bookings land on your calendar by default, never on theirs, unless they flip one switch on their manage link to opt in. The full mechanics are on the features page.

Cost and limits, stated plainly: invited connections require the Pro plan (SGD 7/month or SGD 60/year, details on the pricing page) plus SGD 2 per connected person per month, billed monthly only, charged from the day the person actually connects, prorated, and stopped when they disconnect. Invitees can connect Google or Outlook calendars only for now; if your contractor lives on an Apple calendar, this option does not cover them yet.

Side by Side

Option	Effort for the contractor	What you see	Booking layer	Revocation	Ongoing cost
Native sharing	Configure sharing in their settings	Full details or all free/busy, their choice	None	Buried in settings, no notifications	Free
Guest on every event	None	Only the events you created	None	Per event	Free
Shared team calendar	Retype every change	Whatever they remember to copy in	None	Stop writing to it	Free, paid in admin time
Seat in your tool	Account signup and onboarding	Full availability	Yes	Remove the seat	Per-seat fee
Invite-link connection	About a minute, no account	Busy/free by default, full details if they opt in	Yes, person-scoped links	Either side, any time; owner emailed if the person disconnects	SGD 2 per person per month while connected

Which One Should You Pick?

• Same organisation: native sharing. It is free, built in, and centrally managed.
• One or two meetings ever: guest invites are fine. Do not build infrastructure for a relationship that fits in three emails.
• Contractor embedded near full-time: a seat in your scheduling tool is defensible.
• Recurring contractors you book weekly or monthly: an invite-link connection gives you current availability plus a bookable link for SGD 2 per person per month, with the contractor keeping control of what you see.
• Contractor who declines any connection: respect it, and send them your plain booking link instead. They pick from your open slots like anyone else. You lose visibility into their calendar but still skip the back-and-forth.

The Invite Flow, In Brief

1. On CalendarSync Pro, send an invite to the contractor's email address. Each invite covers one person, works once, and expires in seven days.
2. They open the link, keep Busy only (the default) or choose Full details, click Connect Google or Connect Outlook, and sign in on the provider's own page. About a minute, no account created.
3. Their busy times appear alongside your own calendars, kept current by near-instant sync.
4. Optional: create a booking link, tick their name plus one of your calendars, and turn on "This link books [name]" so clients can book them directly.

For the step-by-step versions of both halves, see how to see subcontractor availability without calendar sharing and how to let clients book your team without logins.