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Sequencing plumbing decisions in a bathroom remodel
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In a hypothetical full bathroom remodel, the toilet could stay put while the shower moves and a second basin is added. The layout might look straightforward on paper, but the drains, vent route, and water supplies could make the plumbing work more involved.
What would you want established before settling on a layout? I’d be interested in how you assess existing pipe condition and compatibility with new materials, and how much access to valves and drain connections should shape the design. How do you coordinate the shower drain location with the shower base or tile assembly and waterproofing, rather than treating those as separate decisions?
I’m also curious how you’d plan the work sequence around permits and inspections, and what a contractor’s scope should say about concealed conditions and added work. With no measurements or site details, I’m not looking for a code number or a yes-or-no on feasibility. Conditional advice about what changes the plan would be useful, especially for hot-water demand and the cost contingency.
13 replies
For concealed conditions, I’d want the contract to require a written description of what was found, the proposed remedy, and its price before out-of-scope work starts. Any emergency exception should be defined in advance. A separate contingency allowance helps cover surprises without making it a blank cheque.
For the hot-water plan, the key variable is peak simultaneous use, not just the added basin. If the shower and both basins might be used at once, compare that demand with the heater’s usable capacity and recovery rate. A shortfall could mean budgeting for a heater change or planning around less simultaneous use, which may affect space and layout.
Permits and inspection timing can change the sequence before the layout is locked in. I’d confirm what approvals the proposed plumbing work needs and when concealed work has to be inspected. That way the schedule leaves drains, vents, and supply lines accessible until any required inspection is passed, instead of closing walls or installing finishes and having to reopen them.
I’d want the accessible pipes identified by material and checked for condition before the layout is locked in. The proposed connections need to suit what’s already there, and the design shouldn’t bury valves or drain joints where they can’t be serviced. For the shower, settle the drain location alongside the specific base or tile assembly and waterproofing details; they need to work together as one continuous drainage and waterproofing system.
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