York Region is served by two publicly funded English boards running in parallel: York Region District School Board, which is the public board, and York Catholic District School Board, which runs St. Robert. They have separate trustees, separate boundary maps and separate locator tools, and the two sets of boundaries do not line up with each other.

This matters in practice because a home can sit in a strong public catchment and a different Catholic catchment, or the reverse. If you are weighing both systems, you have two separate checks to do on the same address, not one.

It also means that anything you have read about the public board's boundary reviews, programs or admission rules tells you nothing reliable about this school. Our guides to Bayview Secondary and Richmond Hill High School cover the public side, and the rules there are not the rules here.

The neighbourhood names above are how people talk about the area. They are not the boundary. Catholic board attendance areas are drawn by the board, they do not follow neighbourhood lines, and they change with enrolment pressure and periodic review.

Use York Catholic District School Board's own school locator with the full property address, or phone the board and give them the address. Do it before you write an offer, not after. If both systems are on your list, run the same address through the public board's locator as well so you know what you are getting on both sides.

A listing description is not proof of anything. Neither is what the street was zoned for three years ago, and neither is a neighbour's recollection.

St. Robert turns up high on published secondary school rankings, and that is why most people searching for it found it in the first place. Worth understanding what those tables measure before you make a seven-figure decision on the strength of one.

Most rankings lean heavily on standardized test results and similar quantitative measures. At a school with a selective regional program drawing applicants from across the region, those results reflect the program's intake as well as the teaching. A school-wide number does not tell you what the regular program experience looks like, and that is the program your address actually gives you.

Check the current year's figures directly rather than relying on an article, and then go further than the table: visit, go to an open house, and talk to parents whose children are in the stream your child would actually be in. That conversation will tell you more than any ranking position.

The area around the school is mature Thornhill rather than new construction. German Mills and the Thornlea pockets are largely detached homes from the 1970s and 1980s on good-sized lots with heavy tree cover, and a significant share have been renovated or rebuilt, which creates a wide price range on the same street.

Aileen-Willowbrook and the Bayview and John pockets add townhouses and some condominium inventory, which is the realistic entry point for families who want proximity without a detached budget. The Commerce Valley and Highway 7 corridor to the north brings condo supply that is close to the school but a different lifestyle entirely.

With housing stock this age, the practical due diligence is consistent: roof, furnace, air conditioner, windows, electrical panel and whether the kitchen and bathrooms are original. None of that is a reason to walk away. It is a reason to know the dates before you set your price. Our guide to home inspections in Ontario covers what to look for in homes of this vintage.

1. Decide which program you are actually after. The regular program at the school, or the regional program. They have completely different requirements and only one of them is tied to your address.

2. Run the address through both boards. Catholic and public boundaries are drawn separately. Two checks, one address.

3. Ask whether a boundary review is under way. Boards publish their review processes. An active review for this area is something you want to know before you commit, not after.

4. Compare sales within the boundary, not across it. This is how buyers in school areas most often either overpay or lose a home they could have won. Similar houses on either side of a line are not comparable sales.

5. Put a number on what the boundary is worth to you. Do it before you are standing in a house you love and facing four other offers. Families who never set that number are the ones who stretch furthest.

If your home is in the attendance boundary, that is a genuine selling point to a specific and motivated buyer, and it should be stated clearly rather than buried in a features list. Confirm your current boundary before you list rather than repeating what the previous listing said.

What you should not do is imply that the address delivers a seat in the regional program. Buyers researching this school often know the admission process better than the agent marketing the house, and an overstated claim costs you credibility at exactly the wrong moment. Worse, it is the kind of thing that unravels a deal late.

If the school years are behind you and this sale is one half of a larger move, our Markham relocation guide and our downsizing guide cover sequencing both sides of it.