Laconia has been milling since 1765 and building housing for mill workers nearly as long, which is why a bathroom remodel here so often turns into a conversation about the cast-iron stack behind the wall. We do fixture swaps, shut-off valves, tub and shower work, and full remodel rough-in — and we’ll tell you what’s behind the plaster before you’ve bought tile.
The dates explain the plumbing. Lumber and grist mills went up on Mill Street in 1765. The Belknap Mill was built in 1823 and is still the oldest unaltered brick textile mill in the country. The Laconia Car Company ran from 1848 into the 1930s as the city’s largest employer, turning out rail, trolley and subway cars — alongside hosiery, shoes and knitting machinery. All of that needed workers, the workers needed houses, and those houses are still standing and still full of people.
Which means, with a wall open: a cast-iron drain stack, hubbed and packed, running floor to roof. Galvanized supply branches. Venting that was acceptable in 1915 and isn’t now, or that was never there — the kitchen sink that gurgles when the upstairs tub drains is an old friend around here. Cast iron is not automatically a problem, either; a stack in decent shape can have decades left in it and we’ll tell you that for free. But the bottom three feet, where it turns and goes through the basement floor, is where it rots. That’s directly under the bathroom you’re about to build.
The waste goes somewhere unusual, too. Laconia doesn’t run its own treatment plant — it’s one of ten communities on the state-owned Winnipesaukee River Basin Program, roughly 55 miles of large-diameter interceptor and 14 pumping stations feeding a plant in Franklin that treats about 5.5 million gallons a day. For a remodel that matters in exactly one way: adding fixtures means your building’s own lateral and stack have to carry them, and nobody is coming to upsize those for you.
If you’re buying an older Laconia house with a remodel in mind, go look at the bottom of the cast-iron stack in the basement with a flashlight and tap it with a screwdriver handle. Solid is solid. A dull thud and rust flakes is a number you want in your offer, not in your renovation.
The order that saves money is unglamorous: have somebody look at the stack, the venting and the supply branches first, then choose fixtures. Not the other way around. We’ve been handed a finished design with a freestanding tub filler on an uninsulated exterior wall fed by galvanized pipe, and the honest answer was that the tub would be lovely and the filler would freeze. Much better to hear that at the drawing stage than after the deposit.
Moving a toilet is the expensive sentence in any Laconia remodel. A couple of feet, same side of the stack, usually straightforward. Across the room or onto a different wall and you’re cutting cast iron, setting a new fitting and re-venting the whole thing — in a floor system framed in 1905 out of whatever came off the mill that week. Entirely doable. Just not a decision to make on the morning the tile shows up.
And while the wall is open: shut-off valves. Every fixture, every time. In an old building with one main, individual stops are the whole difference between fixing a toilet and shutting water off to three apartments. They’re inexpensive during a remodel and awkward to add afterward. It’s the single most common thing we add to a scope, and nobody has ever called back annoyed about it.
Straightforward fixture work in Laconia — a faucet, a toilet, a set of new shut-offs — typically runs $200–$600 installed. Bathroom and kitchen remodel rough-in is quoted per project once we’ve seen the plan and, ideally, the stack it has to tie into. Getting us in at the drawing stage usually saves more than it costs.
Not usually. A stack in sound condition can have decades left, and we’ll say so rather than sell you a repipe. What we do want to see is the bottom few feet where it passes through the basement floor, because that’s where it rots from the inside out. If that section is going, replace it while the wall is open.
Usually yes, and it’s the costliest change in the project. Within a couple of feet on the same side of the stack is simple work. Moving it across the room means cutting into cast iron, setting a new fitting and re-venting it, in framing nobody engineered for this. We’ll price it honestly before you commit to the layout.
Almost always venting. The tub pulls air through the nearest opening it can find, and in a house plumbed before modern venting rules that opening is your sink trap. It’s a nuisance, but it also means a trap can get siphoned and let sewer gas in. It’s fixable, and a remodel is the right time.
If it’s exposed and you’re already paying for access, almost always. Galvanized closes up from the inside, so the pressure complaint you’ve lived with for years is the pipe, not the city main. You don’t have to do the whole house at once — it goes section by section, and the sections you’ve opened are the cheap ones.
For contracted plumbing work, yes — New Hampshire requires a state master plumber license, administered through the Office of Professional Licensure and Certification. Ask anybody you’re considering for theirs, ours included. It’s a fair question and a short conversation with anyone who has one.
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