One point I would add is that you have a new generation of real estate companies are using data and other tools to buy real estate fast, upgrade them and then flip them. This might mean less of a need for an inspection service from the client side (as they will likely do this for them) but the emergence of the need for services like inspections from these large companies, so if you get the big contracts, might be a very interesting place to be at and to get recurrent revenues.
Having been an investor in an inspection business (although it was a car one) one more thing I will say, one of the parts we found was more challenging, in addition to managing large workforces, is normally the client acquisition bit particularly if you don't control it, as this is a business where people buy houses on average every 8 years (US) and the odds that they know someone else buying a house at the same time are low, so word of mouth is hard to use to build momentum, you're dependent in the likes of google and partnerships with realtors, etc, which may disappear or you may get priced out very quickly. So to make it a truly sustainable business your client acquisition strategy needs to be spot on (like most businesses, but particularly relevant on this one) and you should have some sort of long term differentiation/angle vs the competition.

This is a professional services opportunity, with the specific positives and negative of that type of business, plus the part where every employee has to be licensed by the state (in most states, anyway), limiting employee availability.

If you've got great connections throughout the RE world in your geography, there's a good chance you could pick up enough business to make it work.

Of course, you'll need to be doing business in one of the states where RE is still exploding (Texas, Tenn, Florida are big here) for it to have enough oxygen to burn.