Every repair starts with a diagnosis. Skip it and you’ll replace the right part for the wrong problem.
You’re standing in your bathroom looking at a toilet. Maybe there’s a puddle creeping out from under the base after every flush. Maybe the whole thing rocks when you sit on it — just a quarter-inch of movement, but enough that you feel it. Maybe there’s a hairline crack running down the outside of the bowl and you’re trying to decide whether that’s cosmetic or catastrophic. Maybe the toilet is just old — thirty years old, scaled with hard-water minerals, and it wastes a gallon and a half per flush when modern ones use a fifth of that.
Whatever brought you here, the question you’re actually solving is simple: is the right fix a repair, or a replacement?
I’ve been doing home repair in my own houses for more than forty years. Plumbing, electrical, framing, tile — if it happens inside a house, I’ve done it at least once, and most of it more than I can count. The single most common mistake I see homeowners make isn’t technical. It isn’t a wrench slipping or a measurement missed. It’s replacing something before understanding what’s wrong with it. A $300 toilet and an afternoon of your time is the wrong answer when the real problem was a $4 flapper that would have taken five minutes.
So the first thing this book does — before tools, before shopping lists, before the sequence of installation — is walk you through the diagnostic tree in Chapter 2. If you’re in the right book after that, you’ll come back here.
This book covers a complete replacement of a residential toilet: removing the old bowl and tank, preparing the flange (the cast-iron or PVC ring in the floor that the toilet bolts to), setting a new wax ring, installing the new fixture, connecting the supply line, caulking the base, and leak-testing. It also covers how to choose the right replacement toilet for your rough-in, your height, and the bathroom you have — which is more interesting than it sounds, because every one of those decisions has a dollar consequence and a comfort consequence.
It is written for a residential two-piece or one-piece gravity-fed toilet with a standard 12-inch rough-in. That’s roughly 95% of American homes. If you have a wall-hung toilet, a pressure-assist flush, or an uncommon rough-in, the sequence in Chapter 5 still applies — but some of the specifics won’t.
Three adjacent jobs come up often enough that I need to name them and point you elsewhere:
If any of those is your real job, close this book and come back when you’ve handled them. The sequence in Chapter 5 assumes a sound flange on a sound subfloor. Skip that assumption and you will be doing the whole thing twice.
You’ll be able to replace a toilet — from shutoff to final caulk — in about two and a half hours the first time you do it. Second time, about ninety minutes. The longest single step is scraping the old wax ring off the flange, because there is no fast way to do that and have it come out clean. The trickiest step is getting the new bowl down straight onto the closet bolts in one try, because you can’t really practice it. I’ll tell you how to rehearse it before the wax is placed, which is the closest thing to practice you get.
And you’ll know when to stop. There are four situations where this job grew past a homeowner replacement the moment you lifted the old bowl. Chapter 7 names them. Knowing those four is worth more than any tool in your kit.